Add QueryBuilder, ExpressionBuilder and CompositeExpression wrappers

lib/private/appframework/db/db.php

@@ -45,6 +45,24 @@ class Db implements IDb {
 		$this->connection = $connection;
 	}
 
+	/**
+	 * Gets the ExpressionBuilder for the connection.
+	 *
+	 * @return \OCP\DB\IExpressionBuilder
+	 */
+	public function getExpressionBuilder() {
+		return $this->connection->getExpressionBuilder();
+	}
+
+	/**
+	 * Gets the ExpressionBuilder for the connection.
+	 *
+	 * @return \OCP\DB\IQueryBuilder
+	 */
+	public function getQueryBuilder() {
+		return $this->connection->getQueryBuilder();
+	}
+
 	/**
 	 * Used to abstract the ownCloud database access away
 	 *

lib/private/db/compositeexpression.php

@@ -0,0 +1,92 @@
+<?php
+/**
+ * @author Joas Schilling <nickvergessen@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\DB;
+
+use OCP\DB\ICompositeExpression;
+
+class CompositeExpression implements ICompositeExpression, \Countable {
+	/** @var \Doctrine\DBAL\Query\Expression\CompositeExpression */
+	protected $compositeExpression;
+
+	/**
+	 * Constructor.
+	 *
+	 * @param \Doctrine\DBAL\Query\Expression\CompositeExpression $compositeExpression
+	 */
+	public function __construct(\Doctrine\DBAL\Query\Expression\CompositeExpression $compositeExpression) {
+		$this->compositeExpression = $compositeExpression;
+	}
+
+	/**
+	 * Adds multiple parts to composite expression.
+	 *
+	 * @param array $parts
+	 *
+	 * @return \OCP\DB\ICompositeExpression
+	 */
+	public function addMultiple(array $parts = array()) {
+		$this->compositeExpression->addMultiple($parts);
+
+		return $this;
+	}
+
+	/**
+	 * Adds an expression to composite expression.
+	 *
+	 * @param mixed $part
+	 *
+	 * @return \OCP\DB\ICompositeExpression
+	 */
+	public function add($part) {
+		$this->compositeExpression->add($part);
+
+		return $this;
+	}
+
+	/**
+	 * Retrieves the amount of expressions on composite expression.
+	 *
+	 * @return integer
+	 */
+	public function count() {
+		return $this->compositeExpression->count();
+	}
+
+	/**
+	 * Returns the type of this composite expression (AND/OR).
+	 *
+	 * @return string
+	 */
+	public function getType() {
+		return $this->compositeExpression->getType();
+	}
+
+	/**
+	 * Retrieves the string representation of this composite expression.
+	 *
+	 * @return string
+	 */
+	public function __toString()
+	{
+		return (string) $this->compositeExpression;
+	}
+}

lib/private/db/connection.php

@@ -51,6 +51,24 @@ class Connection extends \Doctrine\DBAL\Connection implements IDBConnection {
 		}
 	}
 
+	/**
+	 * Gets the ExpressionBuilder for the connection.
+	 *
+	 * @return \OCP\DB\IExpressionBuilder
+	 */
+	public function getExpressionBuilder() {
+		return new ExpressionBuilder($this);
+	}
+
+	/**
+	 * Gets the QueryBuilder for the connection.
+	 *
+	 * @return \OCP\DB\IQueryBuilder
+	 */
+	public function getQueryBuilder() {
+		return new QueryBuilder($this);
+	}
+
 	/**
 	 * @return string
 	 */

lib/private/db/expressionbuilder.php

@@ -0,0 +1,282 @@
+<?php
+/**
+ * @author Joas Schilling <nickvergessen@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\DB;
+
+use Doctrine\DBAL\Query\Expression\ExpressionBuilder as DoctrineExpressionBuilder;
+use OCP\DB\IExpressionBuilder;
+use OCP\IDBConnection;
+
+class ExpressionBuilder implements IExpressionBuilder {
+	/** @var \Doctrine\DBAL\Query\Expression\ExpressionBuilder */
+	private $expressionBuilder;
+
+	/**
+	 * Initializes a new <tt>ExpressionBuilder</tt>.
+	 *
+	 * @param \OCP\IDBConnection $connection
+	 */
+	public function __construct(IDBConnection $connection) {
+		$this->expressionBuilder = new DoctrineExpressionBuilder($connection);
+	}
+
+	/**
+	 * Creates a conjunction of the given boolean expressions.
+	 *
+	 * Example:
+	 *
+	 *     [php]
+	 *     // (u.type = ?) AND (u.role = ?)
+	 *     $expr->andX('u.type = ?', 'u.role = ?'));
+	 *
+	 * @param mixed $x Optional clause. Defaults = null, but requires
+	 *                 at least one defined when converting to string.
+	 *
+	 * @return \OCP\DB\ICompositeExpression
+	 */
+	public function andX($x = null) {
+		$compositeExpression = call_user_func_array([$this->expressionBuilder, 'andX'], func_get_args());
+		return new CompositeExpression($compositeExpression);
+	}
+
+	/**
+	 * Creates a disjunction of the given boolean expressions.
+	 *
+	 * Example:
+	 *
+	 *     [php]
+	 *     // (u.type = ?) OR (u.role = ?)
+	 *     $qb->where($qb->expr()->orX('u.type = ?', 'u.role = ?'));
+	 *
+	 * @param mixed $x Optional clause. Defaults = null, but requires
+	 *                 at least one defined when converting to string.
+	 *
+	 * @return \OCP\DB\ICompositeExpression
+	 */
+	public function orX($x = null) {
+		$compositeExpression = call_user_func_array([$this->expressionBuilder, 'orX'], func_get_args());
+		return new CompositeExpression($compositeExpression);
+	}
+
+	/**
+	 * Creates a comparison expression.
+	 *
+	 * @param mixed $x The left expression.
+	 * @param string $operator One of the ExpressionBuilder::* constants.
+	 * @param mixed $y The right expression.
+	 *
+	 * @return string
+	 */
+	public function comparison($x, $operator, $y) {
+		return $this->expressionBuilder->comparison($x, $operator, $y);
+	}
+
+	/**
+	 * Creates an equality comparison expression with the given arguments.
+	 *
+	 * First argument is considered the left expression and the second is the right expression.
+	 * When converted to string, it will generated a <left expr> = <right expr>. Example:
+	 *
+	 *     [php]
+	 *     // u.id = ?
+	 *     $expr->eq('u.id', '?');
+	 *
+	 * @param mixed $x The left expression.
+	 * @param mixed $y The right expression.
+	 *
+	 * @return string
+	 */
+	public function eq($x, $y) {
+		return $this->expressionBuilder->eq($x, $y);
+	}
+
+	/**
+	 * Creates a non equality comparison expression with the given arguments.
+	 * First argument is considered the left expression and the second is the right expression.
+	 * When converted to string, it will generated a <left expr> <> <right expr>. Example:
+	 *
+	 *     [php]
+	 *     // u.id <> 1
+	 *     $q->where($q->expr()->neq('u.id', '1'));
+	 *
+	 * @param mixed $x The left expression.
+	 * @param mixed $y The right expression.
+	 *
+	 * @return string
+	 */
+	public function neq($x, $y) {
+		return $this->expressionBuilder->neq($x, $y);
+	}
+
+	/**
+	 * Creates a lower-than comparison expression with the given arguments.
+	 * First argument is considered the left expression and the second is the right expression.
+	 * When converted to string, it will generated a <left expr> < <right expr>. Example:
+	 *
+	 *     [php]
+	 *     // u.id < ?
+	 *     $q->where($q->expr()->lt('u.id', '?'));
+	 *
+	 * @param mixed $x The left expression.
+	 * @param mixed $y The right expression.
+	 *
+	 * @return string
+	 */
+	public function lt($x, $y) {
+		return $this->expressionBuilder->lt($x, $y);
+	}
+
+	/**
+	 * Creates a lower-than-equal comparison expression with the given arguments.
+	 * First argument is considered the left expression and the second is the right expression.
+	 * When converted to string, it will generated a <left expr> <= <right expr>. Example:
+	 *
+	 *     [php]
+	 *     // u.id <= ?
+	 *     $q->where($q->expr()->lte('u.id', '?'));
+	 *
+	 * @param mixed $x The left expression.
+	 * @param mixed $y The right expression.
+	 *
+	 * @return string
+	 */
+	public function lte($x, $y) {
+		return $this->expressionBuilder->lte($x, $y);
+	}
+
+	/**
+	 * Creates a greater-than comparison expression with the given arguments.
+	 * First argument is considered the left expression and the second is the right expression.
+	 * When converted to string, it will generated a <left expr> > <right expr>. Example:
+	 *
+	 *     [php]
+	 *     // u.id > ?
+	 *     $q->where($q->expr()->gt('u.id', '?'));
+	 *
+	 * @param mixed $x The left expression.
+	 * @param mixed $y The right expression.
+	 *
+	 * @return string
+	 */
+	public function gt($x, $y) {
+		return $this->expressionBuilder->gt($x, $y);
+	}
+
+	/**
+	 * Creates a greater-than-equal comparison expression with the given arguments.
+	 * First argument is considered the left expression and the second is the right expression.
+	 * When converted to string, it will generated a <left expr> >= <right expr>. Example:
+	 *
+	 *     [php]
+	 *     // u.id >= ?
+	 *     $q->where($q->expr()->gte('u.id', '?'));
+	 *
+	 * @param mixed $x The left expression.
+	 * @param mixed $y The right expression.
+	 *
+	 * @return string
+	 */
+	public function gte($x, $y) {
+		return $this->expressionBuilder->gte($x, $y);
+	}
+
+	/**
+	 * Creates an IS NULL expression with the given arguments.
+	 *
+	 * @param string $x The field in string format to be restricted by IS NULL.
+	 *
+	 * @return string
+	 */
+	public function isNull($x) {
+		return $this->expressionBuilder->isNull($x);
+	}
+
+	/**
+	 * Creates an IS NOT NULL expression with the given arguments.
+	 *
+	 * @param string $x The field in string format to be restricted by IS NOT NULL.
+	 *
+	 * @return string
+	 */
+	public function isNotNull($x) {
+		return $this->expressionBuilder->isNotNull($x);
+	}
+
+	/**
+	 * Creates a LIKE() comparison expression with the given arguments.
+	 *
+	 * @param string $x Field in string format to be inspected by LIKE() comparison.
+	 * @param mixed $y Argument to be used in LIKE() comparison.
+	 *
+	 * @return string
+	 */
+	public function like($x, $y) {
+		return $this->expressionBuilder->like($x, $y);
+	}
+
+	/**
+	 * Creates a NOT LIKE() comparison expression with the given arguments.
+	 *
+	 * @param string $x Field in string format to be inspected by NOT LIKE() comparison.
+	 * @param mixed $y Argument to be used in NOT LIKE() comparison.
+	 *
+	 * @return string
+	 */
+	public function notLike($x, $y) {
+		return $this->expressionBuilder->notLike($x, $y);
+	}
+
+	/**
+	 * Creates a IN () comparison expression with the given arguments.
+	 *
+	 * @param string $x The field in string format to be inspected by IN() comparison.
+	 * @param string|array $y The placeholder or the array of values to be used by IN() comparison.
+	 *
+	 * @return string
+	 */
+	public function in($x, $y) {
+		return $this->expressionBuilder->in($x, $y);
+	}
+
+	/**
+	 * Creates a NOT IN () comparison expression with the given arguments.
+	 *
+	 * @param string $x The field in string format to be inspected by NOT IN() comparison.
+	 * @param string|array $y The placeholder or the array of values to be used by NOT IN() comparison.
+	 *
+	 * @return string
+	 */
+	public function notIn($x, $y) {
+		return $this->expressionBuilder->notIn($x, $y);
+	}
+
+	/**
+	 * Quotes a given input parameter.
+	 *
+	 * @param mixed $input The parameter to be quoted.
+	 * @param string|null $type The type of the parameter.
+	 *
+	 * @return string
+	 */
+	public function literal($input, $type = null) {
+		return $this->expressionBuilder->literal($input, $type);
+	}
+}

lib/private/db/querybuilder.php

@@ -0,0 +1,865 @@
+<?php
+/**
+ * @author Joas Schilling <nickvergessen@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\DB;
+
+use OCP\DB\IQueryBuilder;
+use OCP\IDBConnection;
+
+class QueryBuilder implements IQueryBuilder {
+
+	/** @var \OCP\IDBConnection */
+	private $connection;
+
+	/** @var \Doctrine\DBAL\Query\QueryBuilder */
+	private $queryBuilder;
+
+	/**
+	 * Initializes a new <tt>QueryBuilder</tt>.
+	 *
+	 * @var \OCP\IDBConnection
+	 */
+	public function __construct(IDBConnection $connection)
+	{
+		$this->connection = $connection;
+		$this->queryBuilder = new \Doctrine\DBAL\Query\QueryBuilder($this->connection);
+	}
+
+	/**
+	 * Gets an ExpressionBuilder used for object-oriented construction of query expressions.
+	 * This producer method is intended for convenient inline usage. Example:
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u')
+	 *         ->from('users', 'u')
+	 *         ->where($qb->expr()->eq('u.id', 1));
+	 * </code>
+	 *
+	 * For more complex expression construction, consider storing the expression
+	 * builder object in a local variable.
+	 *
+	 * @return \OCP\DB\IExpressionBuilder
+	 */
+	public function expr() {
+		return $this->connection->getExpressionBuilder();
+	}
+
+	/**
+	 * Gets the type of the currently built query.
+	 *
+	 * @return integer
+	 */
+	public function getType() {
+		return $this->queryBuilder->getType();
+	}
+
+	/**
+	 * Gets the associated DBAL Connection for this query builder.
+	 *
+	 * @return \OCP\IDBConnection
+	 */
+	public function getConnection() {
+		return $this->connection;
+	}
+
+	/**
+	 * Gets the state of this query builder instance.
+	 *
+	 * @return integer Either QueryBuilder::STATE_DIRTY or QueryBuilder::STATE_CLEAN.
+	 */
+	public function getState() {
+		return $this->queryBuilder->getState();
+	}
+
+	/**
+	 * Executes this query using the bound parameters and their types.
+	 *
+	 * Uses {@see Connection::executeQuery} for select statements and {@see Connection::executeUpdate}
+	 * for insert, update and delete statements.
+	 *
+	 * @return \Doctrine\DBAL\Driver\Statement|int
+	 */
+	public function execute() {
+		return $this->queryBuilder->execute();
+	}
+
+	/**
+	 * Gets the complete SQL string formed by the current specifications of this QueryBuilder.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u')
+	 *         ->from('User', 'u')
+	 *     echo $qb->getSQL(); // SELECT u FROM User u
+	 * </code>
+	 *
+	 * @return string The SQL query string.
+	 */
+	public function getSQL() {
+		return $this->queryBuilder->getSQL();
+	}
+
+	/**
+	 * Sets a query parameter for the query being constructed.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u')
+	 *         ->from('users', 'u')
+	 *         ->where('u.id = :user_id')
+	 *         ->setParameter(':user_id', 1);
+	 * </code>
+	 *
+	 * @param string|integer $key The parameter position or name.
+	 * @param mixed $value The parameter value.
+	 * @param string|null $type One of the PDO::PARAM_* constants.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function setParameter($key, $value, $type = null) {
+		$this->queryBuilder->setParameter($key, $value, $type);
+
+		return $this;
+	}
+
+	/**
+	 * Sets a collection of query parameters for the query being constructed.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u')
+	 *         ->from('users', 'u')
+	 *         ->where('u.id = :user_id1 OR u.id = :user_id2')
+	 *         ->setParameters(array(
+	 *             ':user_id1' => 1,
+	 *             ':user_id2' => 2
+	 *         ));
+	 * </code>
+	 *
+	 * @param array $params The query parameters to set.
+	 * @param array $types The query parameters types to set.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function setParameters(array $params, array $types = array()) {
+		$this->queryBuilder->setParameters($params, $types);
+
+		return $this;
+	}
+
+	/**
+	 * Gets all defined query parameters for the query being constructed indexed by parameter index or name.
+	 *
+	 * @return array The currently defined query parameters indexed by parameter index or name.
+	 */
+	public function getParameters() {
+		return $this->queryBuilder->getParameters();
+	}
+
+	/**
+	 * Gets a (previously set) query parameter of the query being constructed.
+	 *
+	 * @param mixed $key The key (index or name) of the bound parameter.
+	 *
+	 * @return mixed The value of the bound parameter.
+	 */
+	public function getParameter($key) {
+		return $this->queryBuilder->getParameter($key);
+	}
+
+	/**
+	 * Gets all defined query parameter types for the query being constructed indexed by parameter index or name.
+	 *
+	 * @return array The currently defined query parameter types indexed by parameter index or name.
+	 */
+	public function getParameterTypes() {
+		return $this->queryBuilder->getParameterTypes();
+	}
+
+	/**
+	 * Gets a (previously set) query parameter type of the query being constructed.
+	 *
+	 * @param mixed $key The key (index or name) of the bound parameter type.
+	 *
+	 * @return mixed The value of the bound parameter type.
+	 */
+	public function getParameterType($key) {
+		return $this->queryBuilder->getParameterType($key);
+	}
+
+	/**
+	 * Sets the position of the first result to retrieve (the "offset").
+	 *
+	 * @param integer $firstResult The first result to return.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function setFirstResult($firstResult) {
+		$this->queryBuilder->setFirstResult($firstResult);
+
+		return $this;
+	}
+
+	/**
+	 * Gets the position of the first result the query object was set to retrieve (the "offset").
+	 * Returns NULL if {@link setFirstResult} was not applied to this QueryBuilder.
+	 *
+	 * @return integer The position of the first result.
+	 */
+	public function getFirstResult() {
+		return $this->queryBuilder->getFirstResult();
+	}
+
+	/**
+	 * Sets the maximum number of results to retrieve (the "limit").
+	 *
+	 * @param integer $maxResults The maximum number of results to retrieve.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function setMaxResults($maxResults) {
+		$this->queryBuilder->setMaxResults($maxResults);
+
+		return $this;
+	}
+
+	/**
+	 * Gets the maximum number of results the query object was set to retrieve (the "limit").
+	 * Returns NULL if {@link setMaxResults} was not applied to this query builder.
+	 *
+	 * @return integer The maximum number of results.
+	 */
+	public function getMaxResults() {
+		return $this->queryBuilder->getMaxResults();
+	}
+
+	/**
+	 * Either appends to or replaces a single, generic query part.
+	 *
+	 * The available parts are: 'select', 'from', 'set', 'where',
+	 * 'groupBy', 'having' and 'orderBy'.
+	 *
+	 * @param string $sqlPartName
+	 * @param string $sqlPart
+	 * @param boolean $append
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function add($sqlPartName, $sqlPart, $append = false) {
+		$this->queryBuilder->add($sqlPartName, $sqlPart, $append);
+
+		return $this;
+	}
+
+	/**
+	 * Specifies an item that is to be returned in the query result.
+	 * Replaces any previously specified selections, if any.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.id', 'p.id')
+	 *         ->from('users', 'u')
+	 *         ->leftJoin('u', 'phonenumbers', 'p', 'u.id = p.user_id');
+	 * </code>
+	 *
+	 * @param mixed $select The selection expressions.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function select($select = null) {
+		$this->queryBuilder->select($select);
+
+		return $this;
+	}
+
+	/**
+	 * Adds an item that is to be returned in the query result.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.id')
+	 *         ->addSelect('p.id')
+	 *         ->from('users', 'u')
+	 *         ->leftJoin('u', 'phonenumbers', 'u.id = p.user_id');
+	 * </code>
+	 *
+	 * @param mixed $select The selection expression.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function addSelect($select = null) {
+		$this->queryBuilder->addSelect($select);
+
+		return $this;
+	}
+
+	/**
+	 * Turns the query being built into a bulk delete query that ranges over
+	 * a certain table.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->delete('users', 'u')
+	 *         ->where('u.id = :user_id');
+	 *         ->setParameter(':user_id', 1);
+	 * </code>
+	 *
+	 * @param string $delete The table whose rows are subject to the deletion.
+	 * @param string $alias The table alias used in the constructed query.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function delete($delete = null, $alias = null) {
+		$this->queryBuilder->delete($delete, $alias);
+
+		return $this;
+	}
+
+	/**
+	 * Turns the query being built into a bulk update query that ranges over
+	 * a certain table
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->update('users', 'u')
+	 *         ->set('u.password', md5('password'))
+	 *         ->where('u.id = ?');
+	 * </code>
+	 *
+	 * @param string $update The table whose rows are subject to the update.
+	 * @param string $alias The table alias used in the constructed query.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function update($update = null, $alias = null) {
+		$this->queryBuilder->update($update, $alias);
+
+		return $this;
+	}
+
+	/**
+	 * Turns the query being built into an insert query that inserts into
+	 * a certain table
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->insert('users')
+	 *         ->values(
+	 *             array(
+	 *                 'name' => '?',
+	 *                 'password' => '?'
+	 *             )
+	 *         );
+	 * </code>
+	 *
+	 * @param string $insert The table into which the rows should be inserted.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function insert($insert = null) {
+		$this->queryBuilder->insert($insert);
+
+		return $this;
+	}
+
+	/**
+	 * Creates and adds a query root corresponding to the table identified by the
+	 * given alias, forming a cartesian product with any existing query roots.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.id')
+	 *         ->from('users', 'u')
+	 * </code>
+	 *
+	 * @param string $from The table.
+	 * @param string|null $alias The alias of the table.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function from($from, $alias = null) {
+		$this->queryBuilder->from($from, $alias);
+
+		return $this;
+	}
+
+	/**
+	 * Creates and adds a join to the query.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.name')
+	 *         ->from('users', 'u')
+	 *         ->join('u', 'phonenumbers', 'p', 'p.is_primary = 1');
+	 * </code>
+	 *
+	 * @param string $fromAlias The alias that points to a from clause.
+	 * @param string $join The table name to join.
+	 * @param string $alias The alias of the join table.
+	 * @param string $condition The condition for the join.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function join($fromAlias, $join, $alias, $condition = null) {
+		$this->queryBuilder->join($fromAlias, $join, $alias, $condition);
+
+		return $this;
+	}
+
+	/**
+	 * Creates and adds a join to the query.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.name')
+	 *         ->from('users', 'u')
+	 *         ->innerJoin('u', 'phonenumbers', 'p', 'p.is_primary = 1');
+	 * </code>
+	 *
+	 * @param string $fromAlias The alias that points to a from clause.
+	 * @param string $join The table name to join.
+	 * @param string $alias The alias of the join table.
+	 * @param string $condition The condition for the join.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function innerJoin($fromAlias, $join, $alias, $condition = null) {
+		$this->queryBuilder->innerJoin($fromAlias, $join, $alias, $condition);
+
+		return $this;
+	}
+
+	/**
+	 * Creates and adds a left join to the query.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.name')
+	 *         ->from('users', 'u')
+	 *         ->leftJoin('u', 'phonenumbers', 'p', 'p.is_primary = 1');
+	 * </code>
+	 *
+	 * @param string $fromAlias The alias that points to a from clause.
+	 * @param string $join The table name to join.
+	 * @param string $alias The alias of the join table.
+	 * @param string $condition The condition for the join.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function leftJoin($fromAlias, $join, $alias, $condition = null) {
+		$this->queryBuilder->leftJoin($fromAlias, $join, $alias, $condition);
+
+		return $this;
+	}
+
+	/**
+	 * Creates and adds a right join to the query.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.name')
+	 *         ->from('users', 'u')
+	 *         ->rightJoin('u', 'phonenumbers', 'p', 'p.is_primary = 1');
+	 * </code>
+	 *
+	 * @param string $fromAlias The alias that points to a from clause.
+	 * @param string $join The table name to join.
+	 * @param string $alias The alias of the join table.
+	 * @param string $condition The condition for the join.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function rightJoin($fromAlias, $join, $alias, $condition = null) {
+		$this->queryBuilder->rightJoin($fromAlias, $join, $alias, $condition);
+
+		return $this;
+	}
+
+	/**
+	 * Sets a new value for a column in a bulk update query.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->update('users', 'u')
+	 *         ->set('u.password', md5('password'))
+	 *         ->where('u.id = ?');
+	 * </code>
+	 *
+	 * @param string $key The column to set.
+	 * @param string $value The value, expression, placeholder, etc.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function set($key, $value) {
+		$this->queryBuilder->set($key, $value);
+
+		return $this;
+	}
+
+	/**
+	 * Specifies one or more restrictions to the query result.
+	 * Replaces any previously specified restrictions, if any.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.name')
+	 *         ->from('users', 'u')
+	 *         ->where('u.id = ?');
+	 *
+	 *     // You can optionally programatically build and/or expressions
+	 *     $qb = $conn->getQueryBuilder();
+	 *
+	 *     $or = $qb->expr()->orx();
+	 *     $or->add($qb->expr()->eq('u.id', 1));
+	 *     $or->add($qb->expr()->eq('u.id', 2));
+	 *
+	 *     $qb->update('users', 'u')
+	 *         ->set('u.password', md5('password'))
+	 *         ->where($or);
+	 * </code>
+	 *
+	 * @param mixed $predicates The restriction predicates.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function where($predicates) {
+		call_user_func_array([$this->queryBuilder, 'where'], func_get_args());
+
+		return $this;
+	}
+
+	/**
+	 * Adds one or more restrictions to the query results, forming a logical
+	 * conjunction with any previously specified restrictions.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u')
+	 *         ->from('users', 'u')
+	 *         ->where('u.username LIKE ?')
+	 *         ->andWhere('u.is_active = 1');
+	 * </code>
+	 *
+	 * @param mixed $where The query restrictions.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 *
+	 * @see where()
+	 */
+	public function andWhere($where) {
+		call_user_func_array([$this->queryBuilder, 'andWhere'], func_get_args());
+
+		return $this;
+	}
+
+	/**
+	 * Adds one or more restrictions to the query results, forming a logical
+	 * disjunction with any previously specified restrictions.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.name')
+	 *         ->from('users', 'u')
+	 *         ->where('u.id = 1')
+	 *         ->orWhere('u.id = 2');
+	 * </code>
+	 *
+	 * @param mixed $where The WHERE statement.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 *
+	 * @see where()
+	 */
+	public function orWhere($where) {
+		call_user_func_array([$this->queryBuilder, 'orWhere'], func_get_args());
+
+		return $this;
+	}
+
+	/**
+	 * Specifies a grouping over the results of the query.
+	 * Replaces any previously specified groupings, if any.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.name')
+	 *         ->from('users', 'u')
+	 *         ->groupBy('u.id');
+	 * </code>
+	 *
+	 * @param mixed $groupBy The grouping expression.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function groupBy($groupBy) {
+		call_user_func_array([$this->queryBuilder, 'groupBy'], func_get_args());
+
+		return $this;
+	}
+
+	/**
+	 * Adds a grouping expression to the query.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.name')
+	 *         ->from('users', 'u')
+	 *         ->groupBy('u.lastLogin');
+	 *         ->addGroupBy('u.createdAt')
+	 * </code>
+	 *
+	 * @param mixed $groupBy The grouping expression.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function addGroupBy($groupBy) {
+		call_user_func_array([$this->queryBuilder, 'addGroupBy'], func_get_args());
+
+		return $this;
+	}
+
+	/**
+	 * Sets a value for a column in an insert query.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->insert('users')
+	 *         ->values(
+	 *             array(
+	 *                 'name' => '?'
+	 *             )
+	 *         )
+	 *         ->setValue('password', '?');
+	 * </code>
+	 *
+	 * @param string $column The column into which the value should be inserted.
+	 * @param string $value The value that should be inserted into the column.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function setValue($column, $value) {
+		$this->queryBuilder->setValue($column, $value);
+
+		return $this;
+	}
+
+	/**
+	 * Specifies values for an insert query indexed by column names.
+	 * Replaces any previous values, if any.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->insert('users')
+	 *         ->values(
+	 *             array(
+	 *                 'name' => '?',
+	 *                 'password' => '?'
+	 *             )
+	 *         );
+	 * </code>
+	 *
+	 * @param array $values The values to specify for the insert query indexed by column names.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function values(array $values) {
+		$this->queryBuilder->values($values);
+
+		return $this;
+	}
+
+	/**
+	 * Specifies a restriction over the groups of the query.
+	 * Replaces any previous having restrictions, if any.
+	 *
+	 * @param mixed $having The restriction over the groups.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function having($having) {
+		call_user_func_array([$this->queryBuilder, 'having'], func_get_args());
+
+		return $this;
+	}
+
+	/**
+	 * Adds a restriction over the groups of the query, forming a logical
+	 * conjunction with any existing having restrictions.
+	 *
+	 * @param mixed $having The restriction to append.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function andHaving($having) {
+		call_user_func_array([$this->queryBuilder, 'andHaving'], func_get_args());
+
+		return $this;
+	}
+
+	/**
+	 * Adds a restriction over the groups of the query, forming a logical
+	 * disjunction with any existing having restrictions.
+	 *
+	 * @param mixed $having The restriction to add.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function orHaving($having) {
+		call_user_func_array([$this->queryBuilder, 'orHaving'], func_get_args());
+
+		return $this;
+	}
+
+	/**
+	 * Specifies an ordering for the query results.
+	 * Replaces any previously specified orderings, if any.
+	 *
+	 * @param string $sort The ordering expression.
+	 * @param string $order The ordering direction.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function orderBy($sort, $order = null) {
+		$this->queryBuilder->orderBy($sort, $order);
+
+		return $this;
+	}
+
+	/**
+	 * Adds an ordering to the query results.
+	 *
+	 * @param string $sort The ordering expression.
+	 * @param string $order The ordering direction.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function addOrderBy($sort, $order = null) {
+		$this->queryBuilder->addOrderBy($sort, $order);
+
+		return $this;
+	}
+
+	/**
+	 * Gets a query part by its name.
+	 *
+	 * @param string $queryPartName
+	 *
+	 * @return mixed
+	 */
+	public function getQueryPart($queryPartName) {
+		return $this->queryBuilder->getQueryPart($queryPartName);
+	}
+
+	/**
+	 * Gets all query parts.
+	 *
+	 * @return array
+	 */
+	public function getQueryParts() {
+		return $this->queryBuilder->getQueryParts();
+	}
+
+	/**
+	 * Resets SQL parts.
+	 *
+	 * @param array|null $queryPartNames
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function resetQueryParts($queryPartNames = null) {
+		$this->queryBuilder->resetQueryParts($queryPartNames);
+
+		return $this;
+	}
+
+	/**
+	 * Resets a single SQL part.
+	 *
+	 * @param string $queryPartName
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 */
+	public function resetQueryPart($queryPartName) {
+		$this->queryBuilder->resetQueryPart($queryPartName);
+
+		return $this;
+	}
+
+	/**
+	 * Creates a new named parameter and bind the value $value to it.
+	 *
+	 * This method provides a shortcut for PDOStatement::bindValue
+	 * when using prepared statements.
+	 *
+	 * The parameter $value specifies the value that you want to bind. If
+	 * $placeholder is not provided bindValue() will automatically create a
+	 * placeholder for you. An automatic placeholder will be of the name
+	 * ':dcValue1', ':dcValue2' etc.
+	 *
+	 * For more information see {@link http://php.net/pdostatement-bindparam}
+	 *
+	 * Example:
+	 * <code>
+	 * $value = 2;
+	 * $q->eq( 'id', $q->bindValue( $value ) );
+	 * $stmt = $q->executeQuery(); // executed with 'id = 2'
+	 * </code>
+	 *
+	 * @license New BSD License
+	 * @link http://www.zetacomponents.org
+	 *
+	 * @param mixed $value
+	 * @param mixed $type
+	 * @param string $placeHolder The name to bind with. The string must start with a colon ':'.
+	 *
+	 * @return string the placeholder name used.
+	 */
+	public function createNamedParameter($value, $type = \PDO::PARAM_STR, $placeHolder = null) {
+		return $this->queryBuilder->createNamedParameter($value, $type, $placeHolder);
+	}
+
+	/**
+	 * Creates a new positional parameter and bind the given value to it.
+	 *
+	 * Attention: If you are using positional parameters with the query builder you have
+	 * to be very careful to bind all parameters in the order they appear in the SQL
+	 * statement , otherwise they get bound in the wrong order which can lead to serious
+	 * bugs in your code.
+	 *
+	 * Example:
+	 * <code>
+	 *  $qb = $conn->getQueryBuilder();
+	 *  $qb->select('u.*')
+	 *     ->from('users', 'u')
+	 *     ->where('u.username = ' . $qb->createPositionalParameter('Foo', PDO::PARAM_STR))
+	 *     ->orWhere('u.username = ' . $qb->createPositionalParameter('Bar', PDO::PARAM_STR))
+	 * </code>
+	 *
+	 * @param mixed $value
+	 * @param integer $type
+	 *
+	 * @return string
+	 */
+	public function createPositionalParameter($value, $type = \PDO::PARAM_STR) {
+		return $this->queryBuilder->createPositionalParameter($value, $type);
+	}
+}

lib/public/db/icompositeexpression.php

@@ -0,0 +1,64 @@
+<?php
+/**
+ * @author Joas Schilling <nickvergessen@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCP\DB;
+
+/**
+ * This class provides a wrapper around Doctrine's CompositeExpression
+ * @since 8.2.0
+ */
+interface ICompositeExpression {
+	/**
+	 * Adds multiple parts to composite expression.
+	 *
+	 * @param array $parts
+	 *
+	 * @return \OCP\DB\ICompositeExpression
+	 * @since 8.2.0
+	 */
+	public function addMultiple(array $parts = array());
+
+	/**
+	 * Adds an expression to composite expression.
+	 *
+	 * @param mixed $part
+	 *
+	 * @return \OCP\DB\ICompositeExpression
+	 * @since 8.2.0
+	 */
+	public function add($part);
+
+	/**
+	 * Retrieves the amount of expressions on composite expression.
+	 *
+	 * @return integer
+	 * @since 8.2.0
+	 */
+	public function count();
+
+	/**
+	 * Returns the type of this composite expression (AND/OR).
+	 *
+	 * @return string
+	 * @since 8.2.0
+	 */
+	public function getType();
+}

lib/public/db/iexpressionbuilder.php

@@ -0,0 +1,252 @@
+<?php
+/**
+ * @author Joas Schilling <nickvergessen@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCP\DB;
+
+/**
+ * This class provides a wrapper around Doctrine's ExpressionBuilder
+ * @since 8.2.0
+ */
+interface IExpressionBuilder {
+	/**
+	 * Creates a conjunction of the given boolean expressions.
+	 *
+	 * Example:
+	 *
+	 *     [php]
+	 *     // (u.type = ?) AND (u.role = ?)
+	 *     $expr->andX('u.type = ?', 'u.role = ?'));
+	 *
+	 * @param mixed $x Optional clause. Defaults = null, but requires
+	 *                 at least one defined when converting to string.
+	 *
+	 * @return \OCP\DB\ICompositeExpression
+	 * @since 8.2.0
+	 */
+	public function andX($x = null);
+
+	/**
+	 * Creates a disjunction of the given boolean expressions.
+	 *
+	 * Example:
+	 *
+	 *     [php]
+	 *     // (u.type = ?) OR (u.role = ?)
+	 *     $qb->where($qb->expr()->orX('u.type = ?', 'u.role = ?'));
+	 *
+	 * @param mixed $x Optional clause. Defaults = null, but requires
+	 *                 at least one defined when converting to string.
+	 *
+	 * @return \OCP\DB\ICompositeExpression
+	 * @since 8.2.0
+	 */
+	public function orX($x = null);
+
+	/**
+	 * Creates a comparison expression.
+	 *
+	 * @param mixed $x The left expression.
+	 * @param string $operator One of the ExpressionBuilder::* constants.
+	 * @param mixed $y The right expression.
+	 *
+	 * @return string
+	 * @since 8.2.0
+	 */
+	public function comparison($x, $operator, $y);
+
+	/**
+	 * Creates an equality comparison expression with the given arguments.
+	 *
+	 * First argument is considered the left expression and the second is the right expression.
+	 * When converted to string, it will generated a <left expr> = <right expr>. Example:
+	 *
+	 *     [php]
+	 *     // u.id = ?
+	 *     $expr->eq('u.id', '?');
+	 *
+	 * @param mixed $x The left expression.
+	 * @param mixed $y The right expression.
+	 *
+	 * @return string
+	 * @since 8.2.0
+	 */
+	public function eq($x, $y);
+
+	/**
+	 * Creates a non equality comparison expression with the given arguments.
+	 * First argument is considered the left expression and the second is the right expression.
+	 * When converted to string, it will generated a <left expr> <> <right expr>. Example:
+	 *
+	 *     [php]
+	 *     // u.id <> 1
+	 *     $q->where($q->expr()->neq('u.id', '1'));
+	 *
+	 * @param mixed $x The left expression.
+	 * @param mixed $y The right expression.
+	 *
+	 * @return string
+	 * @since 8.2.0
+	 */
+	public function neq($x, $y);
+
+	/**
+	 * Creates a lower-than comparison expression with the given arguments.
+	 * First argument is considered the left expression and the second is the right expression.
+	 * When converted to string, it will generated a <left expr> < <right expr>. Example:
+	 *
+	 *     [php]
+	 *     // u.id < ?
+	 *     $q->where($q->expr()->lt('u.id', '?'));
+	 *
+	 * @param mixed $x The left expression.
+	 * @param mixed $y The right expression.
+	 *
+	 * @return string
+	 * @since 8.2.0
+	 */
+	public function lt($x, $y);
+
+	/**
+	 * Creates a lower-than-equal comparison expression with the given arguments.
+	 * First argument is considered the left expression and the second is the right expression.
+	 * When converted to string, it will generated a <left expr> <= <right expr>. Example:
+	 *
+	 *     [php]
+	 *     // u.id <= ?
+	 *     $q->where($q->expr()->lte('u.id', '?'));
+	 *
+	 * @param mixed $x The left expression.
+	 * @param mixed $y The right expression.
+	 *
+	 * @return string
+	 * @since 8.2.0
+	 */
+	public function lte($x, $y);
+
+	/**
+	 * Creates a greater-than comparison expression with the given arguments.
+	 * First argument is considered the left expression and the second is the right expression.
+	 * When converted to string, it will generated a <left expr> > <right expr>. Example:
+	 *
+	 *     [php]
+	 *     // u.id > ?
+	 *     $q->where($q->expr()->gt('u.id', '?'));
+	 *
+	 * @param mixed $x The left expression.
+	 * @param mixed $y The right expression.
+	 *
+	 * @return string
+	 * @since 8.2.0
+	 */
+	public function gt($x, $y);
+
+	/**
+	 * Creates a greater-than-equal comparison expression with the given arguments.
+	 * First argument is considered the left expression and the second is the right expression.
+	 * When converted to string, it will generated a <left expr> >= <right expr>. Example:
+	 *
+	 *     [php]
+	 *     // u.id >= ?
+	 *     $q->where($q->expr()->gte('u.id', '?'));
+	 *
+	 * @param mixed $x The left expression.
+	 * @param mixed $y The right expression.
+	 *
+	 * @return string
+	 * @since 8.2.0
+	 */
+	public function gte($x, $y);
+
+	/**
+	 * Creates an IS NULL expression with the given arguments.
+	 *
+	 * @param string $x The field in string format to be restricted by IS NULL.
+	 *
+	 * @return string
+	 * @since 8.2.0
+	 */
+	public function isNull($x);
+
+	/**
+	 * Creates an IS NOT NULL expression with the given arguments.
+	 *
+	 * @param string $x The field in string format to be restricted by IS NOT NULL.
+	 *
+	 * @return string
+	 * @since 8.2.0
+	 */
+	public function isNotNull($x);
+
+	/**
+	 * Creates a LIKE() comparison expression with the given arguments.
+	 *
+	 * @param string $x Field in string format to be inspected by LIKE() comparison.
+	 * @param mixed $y Argument to be used in LIKE() comparison.
+	 *
+	 * @return string
+	 * @since 8.2.0
+	 */
+	public function like($x, $y);
+
+	/**
+	 * Creates a NOT LIKE() comparison expression with the given arguments.
+	 *
+	 * @param string $x Field in string format to be inspected by NOT LIKE() comparison.
+	 * @param mixed $y Argument to be used in NOT LIKE() comparison.
+	 *
+	 * @return string
+	 * @since 8.2.0
+	 */
+	public function notLike($x, $y);
+
+	/**
+	 * Creates a IN () comparison expression with the given arguments.
+	 *
+	 * @param string $x The field in string format to be inspected by IN() comparison.
+	 * @param string|array $y The placeholder or the array of values to be used by IN() comparison.
+	 *
+	 * @return string
+	 * @since 8.2.0
+	 */
+	public function in($x, $y);
+
+	/**
+	 * Creates a NOT IN () comparison expression with the given arguments.
+	 *
+	 * @param string $x The field in string format to be inspected by NOT IN() comparison.
+	 * @param string|array $y The placeholder or the array of values to be used by NOT IN() comparison.
+	 *
+	 * @return string
+	 * @since 8.2.0
+	 */
+	public function notIn($x, $y);
+
+	/**
+	 * Quotes a given input parameter.
+	 *
+	 * @param mixed $input The parameter to be quoted.
+	 * @param string|null $type The type of the parameter.
+	 *
+	 * @return string
+	 * @since 8.2.0
+	 */
+	public function literal($input, $type = null);
+}

lib/public/db/iquerybuilder.php

@@ -0,0 +1,742 @@
+<?php
+/**
+ * @author Joas Schilling <nickvergessen@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCP\DB;
+
+/**
+ * This class provides a wrapper around Doctrine's QueryBuilder
+ * @since 8.2.0
+ */
+interface IQueryBuilder {
+	/**
+	 * Gets an ExpressionBuilder used for object-oriented construction of query expressions.
+	 * This producer method is intended for convenient inline usage. Example:
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u')
+	 *         ->from('users', 'u')
+	 *         ->where($qb->expr()->eq('u.id', 1));
+	 * </code>
+	 *
+	 * For more complex expression construction, consider storing the expression
+	 * builder object in a local variable.
+	 *
+	 * @return \OCP\DB\IExpressionBuilder
+	 * @since 8.2.0
+	 */
+	public function expr();
+
+	/**
+	 * Gets the type of the currently built query.
+	 *
+	 * @return integer
+	 * @since 8.2.0
+	 */
+	public function getType();
+
+	/**
+	 * Gets the associated DBAL Connection for this query builder.
+	 *
+	 * @return \OCP\IDBConnection
+	 * @since 8.2.0
+	 */
+	public function getConnection();
+
+	/**
+	 * Gets the state of this query builder instance.
+	 *
+	 * @return integer Either QueryBuilder::STATE_DIRTY or QueryBuilder::STATE_CLEAN.
+	 * @since 8.2.0
+	 */
+	public function getState();
+
+	/**
+	 * Executes this query using the bound parameters and their types.
+	 *
+	 * Uses {@see Connection::executeQuery} for select statements and {@see Connection::executeUpdate}
+	 * for insert, update and delete statements.
+	 *
+	 * @return \Doctrine\DBAL\Driver\Statement|int
+	 * @since 8.2.0
+	 */
+	public function execute();
+
+	/**
+	 * Gets the complete SQL string formed by the current specifications of this QueryBuilder.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u')
+	 *         ->from('User', 'u')
+	 *     echo $qb->getSQL(); // SELECT u FROM User u
+	 * </code>
+	 *
+	 * @return string The SQL query string.
+	 * @since 8.2.0
+	 */
+	public function getSQL();
+
+	/**
+	 * Sets a query parameter for the query being constructed.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u')
+	 *         ->from('users', 'u')
+	 *         ->where('u.id = :user_id')
+	 *         ->setParameter(':user_id', 1);
+	 * </code>
+	 *
+	 * @param string|integer $key The parameter position or name.
+	 * @param mixed $value The parameter value.
+	 * @param string|null $type One of the PDO::PARAM_* constants.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function setParameter($key, $value, $type = null);
+
+	/**
+	 * Sets a collection of query parameters for the query being constructed.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u')
+	 *         ->from('users', 'u')
+	 *         ->where('u.id = :user_id1 OR u.id = :user_id2')
+	 *         ->setParameters(array(
+	 *             ':user_id1' => 1,
+	 *             ':user_id2' => 2
+	 *         ));
+	 * </code>
+	 *
+	 * @param array $params The query parameters to set.
+	 * @param array $types The query parameters types to set.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function setParameters(array $params, array $types = array());
+
+	/**
+	 * Gets all defined query parameters for the query being constructed indexed by parameter index or name.
+	 *
+	 * @return array The currently defined query parameters indexed by parameter index or name.
+	 * @since 8.2.0
+	 */
+	public function getParameters();
+
+	/**
+	 * Gets a (previously set) query parameter of the query being constructed.
+	 *
+	 * @param mixed $key The key (index or name) of the bound parameter.
+	 *
+	 * @return mixed The value of the bound parameter.
+	 * @since 8.2.0
+	 */
+	public function getParameter($key);
+
+	/**
+	 * Gets all defined query parameter types for the query being constructed indexed by parameter index or name.
+	 *
+	 * @return array The currently defined query parameter types indexed by parameter index or name.
+	 * @since 8.2.0
+	 */
+	public function getParameterTypes();
+
+	/**
+	 * Gets a (previously set) query parameter type of the query being constructed.
+	 *
+	 * @param mixed $key The key (index or name) of the bound parameter type.
+	 *
+	 * @return mixed The value of the bound parameter type.
+	 * @since 8.2.0
+	 */
+	public function getParameterType($key);
+
+	/**
+	 * Sets the position of the first result to retrieve (the "offset").
+	 *
+	 * @param integer $firstResult The first result to return.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function setFirstResult($firstResult);
+
+	/**
+	 * Gets the position of the first result the query object was set to retrieve (the "offset").
+	 * Returns NULL if {@link setFirstResult} was not applied to this QueryBuilder.
+	 *
+	 * @return integer The position of the first result.
+	 * @since 8.2.0
+	 */
+	public function getFirstResult();
+
+	/**
+	 * Sets the maximum number of results to retrieve (the "limit").
+	 *
+	 * @param integer $maxResults The maximum number of results to retrieve.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function setMaxResults($maxResults);
+
+	/**
+	 * Gets the maximum number of results the query object was set to retrieve (the "limit").
+	 * Returns NULL if {@link setMaxResults} was not applied to this query builder.
+	 *
+	 * @return integer The maximum number of results.
+	 * @since 8.2.0
+	 */
+	public function getMaxResults();
+
+	/**
+	 * Either appends to or replaces a single, generic query part.
+	 *
+	 * The available parts are: 'select', 'from', 'set', 'where',
+	 * 'groupBy', 'having' and 'orderBy'.
+	 *
+	 * @param string $sqlPartName
+	 * @param string $sqlPart
+	 * @param boolean $append
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function add($sqlPartName, $sqlPart, $append = false);
+
+	/**
+	 * Specifies an item that is to be returned in the query result.
+	 * Replaces any previously specified selections, if any.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.id', 'p.id')
+	 *         ->from('users', 'u')
+	 *         ->leftJoin('u', 'phonenumbers', 'p', 'u.id = p.user_id');
+	 * </code>
+	 *
+	 * @param mixed $select The selection expressions.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function select($select = null);
+
+	/**
+	 * Adds an item that is to be returned in the query result.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.id')
+	 *         ->addSelect('p.id')
+	 *         ->from('users', 'u')
+	 *         ->leftJoin('u', 'phonenumbers', 'u.id = p.user_id');
+	 * </code>
+	 *
+	 * @param mixed $select The selection expression.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function addSelect($select = null);
+
+	/**
+	 * Turns the query being built into a bulk delete query that ranges over
+	 * a certain table.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->delete('users', 'u')
+	 *         ->where('u.id = :user_id');
+	 *         ->setParameter(':user_id', 1);
+	 * </code>
+	 *
+	 * @param string $delete The table whose rows are subject to the deletion.
+	 * @param string $alias The table alias used in the constructed query.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function delete($delete = null, $alias = null);
+
+	/**
+	 * Turns the query being built into a bulk update query that ranges over
+	 * a certain table
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->update('users', 'u')
+	 *         ->set('u.password', md5('password'))
+	 *         ->where('u.id = ?');
+	 * </code>
+	 *
+	 * @param string $update The table whose rows are subject to the update.
+	 * @param string $alias The table alias used in the constructed query.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function update($update = null, $alias = null);
+
+	/**
+	 * Turns the query being built into an insert query that inserts into
+	 * a certain table
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->insert('users')
+	 *         ->values(
+	 *             array(
+	 *                 'name' => '?',
+	 *                 'password' => '?'
+	 *             )
+	 *         );
+	 * </code>
+	 *
+	 * @param string $insert The table into which the rows should be inserted.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function insert($insert = null);
+
+	/**
+	 * Creates and adds a query root corresponding to the table identified by the
+	 * given alias, forming a cartesian product with any existing query roots.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.id')
+	 *         ->from('users', 'u')
+	 * </code>
+	 *
+	 * @param string $from The table.
+	 * @param string|null $alias The alias of the table.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function from($from, $alias = null);
+
+	/**
+	 * Creates and adds a join to the query.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.name')
+	 *         ->from('users', 'u')
+	 *         ->join('u', 'phonenumbers', 'p', 'p.is_primary = 1');
+	 * </code>
+	 *
+	 * @param string $fromAlias The alias that points to a from clause.
+	 * @param string $join The table name to join.
+	 * @param string $alias The alias of the join table.
+	 * @param string $condition The condition for the join.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function join($fromAlias, $join, $alias, $condition = null);
+
+	/**
+	 * Creates and adds a join to the query.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.name')
+	 *         ->from('users', 'u')
+	 *         ->innerJoin('u', 'phonenumbers', 'p', 'p.is_primary = 1');
+	 * </code>
+	 *
+	 * @param string $fromAlias The alias that points to a from clause.
+	 * @param string $join The table name to join.
+	 * @param string $alias The alias of the join table.
+	 * @param string $condition The condition for the join.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function innerJoin($fromAlias, $join, $alias, $condition = null);
+
+	/**
+	 * Creates and adds a left join to the query.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.name')
+	 *         ->from('users', 'u')
+	 *         ->leftJoin('u', 'phonenumbers', 'p', 'p.is_primary = 1');
+	 * </code>
+	 *
+	 * @param string $fromAlias The alias that points to a from clause.
+	 * @param string $join The table name to join.
+	 * @param string $alias The alias of the join table.
+	 * @param string $condition The condition for the join.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function leftJoin($fromAlias, $join, $alias, $condition = null);
+
+	/**
+	 * Creates and adds a right join to the query.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.name')
+	 *         ->from('users', 'u')
+	 *         ->rightJoin('u', 'phonenumbers', 'p', 'p.is_primary = 1');
+	 * </code>
+	 *
+	 * @param string $fromAlias The alias that points to a from clause.
+	 * @param string $join The table name to join.
+	 * @param string $alias The alias of the join table.
+	 * @param string $condition The condition for the join.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function rightJoin($fromAlias, $join, $alias, $condition = null);
+
+	/**
+	 * Sets a new value for a column in a bulk update query.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->update('users', 'u')
+	 *         ->set('u.password', md5('password'))
+	 *         ->where('u.id = ?');
+	 * </code>
+	 *
+	 * @param string $key The column to set.
+	 * @param string $value The value, expression, placeholder, etc.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function set($key, $value);
+
+	/**
+	 * Specifies one or more restrictions to the query result.
+	 * Replaces any previously specified restrictions, if any.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.name')
+	 *         ->from('users', 'u')
+	 *         ->where('u.id = ?');
+	 *
+	 *     // You can optionally programatically build and/or expressions
+	 *     $qb = $conn->getQueryBuilder();
+	 *
+	 *     $or = $qb->expr()->orx();
+	 *     $or->add($qb->expr()->eq('u.id', 1));
+	 *     $or->add($qb->expr()->eq('u.id', 2));
+	 *
+	 *     $qb->update('users', 'u')
+	 *         ->set('u.password', md5('password'))
+	 *         ->where($or);
+	 * </code>
+	 *
+	 * @param mixed $predicates The restriction predicates.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function where($predicates);
+
+	/**
+	 * Adds one or more restrictions to the query results, forming a logical
+	 * conjunction with any previously specified restrictions.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u')
+	 *         ->from('users', 'u')
+	 *         ->where('u.username LIKE ?')
+	 *         ->andWhere('u.is_active = 1');
+	 * </code>
+	 *
+	 * @param mixed $where The query restrictions.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 *
+	 * @see where()
+	 * @since 8.2.0
+	 */
+	public function andWhere($where);
+
+	/**
+	 * Adds one or more restrictions to the query results, forming a logical
+	 * disjunction with any previously specified restrictions.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.name')
+	 *         ->from('users', 'u')
+	 *         ->where('u.id = 1')
+	 *         ->orWhere('u.id = 2');
+	 * </code>
+	 *
+	 * @param mixed $where The WHERE statement.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 *
+	 * @see where()
+	 * @since 8.2.0
+	 */
+	public function orWhere($where);
+
+	/**
+	 * Specifies a grouping over the results of the query.
+	 * Replaces any previously specified groupings, if any.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.name')
+	 *         ->from('users', 'u')
+	 *         ->groupBy('u.id');
+	 * </code>
+	 *
+	 * @param mixed $groupBy The grouping expression.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function groupBy($groupBy);
+
+	/**
+	 * Adds a grouping expression to the query.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u.name')
+	 *         ->from('users', 'u')
+	 *         ->groupBy('u.lastLogin');
+	 *         ->addGroupBy('u.createdAt')
+	 * </code>
+	 *
+	 * @param mixed $groupBy The grouping expression.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function addGroupBy($groupBy);
+
+	/**
+	 * Sets a value for a column in an insert query.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->insert('users')
+	 *         ->values(
+	 *             array(
+	 *                 'name' => '?'
+	 *             )
+	 *         )
+	 *         ->setValue('password', '?');
+	 * </code>
+	 *
+	 * @param string $column The column into which the value should be inserted.
+	 * @param string $value The value that should be inserted into the column.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function setValue($column, $value);
+
+	/**
+	 * Specifies values for an insert query indexed by column names.
+	 * Replaces any previous values, if any.
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->insert('users')
+	 *         ->values(
+	 *             array(
+	 *                 'name' => '?',
+	 *                 'password' => '?'
+	 *             )
+	 *         );
+	 * </code>
+	 *
+	 * @param array $values The values to specify for the insert query indexed by column names.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function values(array $values);
+
+	/**
+	 * Specifies a restriction over the groups of the query.
+	 * Replaces any previous having restrictions, if any.
+	 *
+	 * @param mixed $having The restriction over the groups.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function having($having);
+
+	/**
+	 * Adds a restriction over the groups of the query, forming a logical
+	 * conjunction with any existing having restrictions.
+	 *
+	 * @param mixed $having The restriction to append.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function andHaving($having);
+
+	/**
+	 * Adds a restriction over the groups of the query, forming a logical
+	 * disjunction with any existing having restrictions.
+	 *
+	 * @param mixed $having The restriction to add.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function orHaving($having);
+
+	/**
+	 * Specifies an ordering for the query results.
+	 * Replaces any previously specified orderings, if any.
+	 *
+	 * @param string $sort The ordering expression.
+	 * @param string $order The ordering direction.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function orderBy($sort, $order = null);
+
+	/**
+	 * Adds an ordering to the query results.
+	 *
+	 * @param string $sort The ordering expression.
+	 * @param string $order The ordering direction.
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function addOrderBy($sort, $order = null);
+
+	/**
+	 * Gets a query part by its name.
+	 *
+	 * @param string $queryPartName
+	 *
+	 * @return mixed
+	 * @since 8.2.0
+	 */
+	public function getQueryPart($queryPartName);
+
+	/**
+	 * Gets all query parts.
+	 *
+	 * @return array
+	 * @since 8.2.0
+	 */
+	public function getQueryParts();
+
+	/**
+	 * Resets SQL parts.
+	 *
+	 * @param array|null $queryPartNames
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function resetQueryParts($queryPartNames = null);
+
+	/**
+	 * Resets a single SQL part.
+	 *
+	 * @param string $queryPartName
+	 *
+	 * @return \OCP\DB\IQueryBuilder This QueryBuilder instance.
+	 * @since 8.2.0
+	 */
+	public function resetQueryPart($queryPartName);
+
+	/**
+	 * Creates a new named parameter and bind the value $value to it.
+	 *
+	 * This method provides a shortcut for PDOStatement::bindValue
+	 * when using prepared statements.
+	 *
+	 * The parameter $value specifies the value that you want to bind. If
+	 * $placeholder is not provided bindValue() will automatically create a
+	 * placeholder for you. An automatic placeholder will be of the name
+	 * ':dcValue1', ':dcValue2' etc.
+	 *
+	 * For more information see {@link http://php.net/pdostatement-bindparam}
+	 *
+	 * Example:
+	 * <code>
+	 * $value = 2;
+	 * $q->eq( 'id', $q->bindValue( $value ) );
+	 * $stmt = $q->executeQuery(); // executed with 'id = 2'
+	 * </code>
+	 *
+	 * @license New BSD License
+	 * @link http://www.zetacomponents.org
+	 *
+	 * @param mixed $value
+	 * @param mixed $type
+	 * @param string $placeHolder The name to bind with. The string must start with a colon ':'.
+	 *
+	 * @return string the placeholder name used.
+	 * @since 8.2.0
+	 */
+	public function createNamedParameter($value, $type = \PDO::PARAM_STR, $placeHolder = null);
+
+	/**
+	 * Creates a new positional parameter and bind the given value to it.
+	 *
+	 * Attention: If you are using positional parameters with the query builder you have
+	 * to be very careful to bind all parameters in the order they appear in the SQL
+	 * statement , otherwise they get bound in the wrong order which can lead to serious
+	 * bugs in your code.
+	 *
+	 * Example:
+	 * <code>
+	 *  $qb = $conn->getQueryBuilder();
+	 *  $qb->select('u.*')
+	 *     ->from('users', 'u')
+	 *     ->where('u.username = ' . $qb->createPositionalParameter('Foo', PDO::PARAM_STR))
+	 *     ->orWhere('u.username = ' . $qb->createPositionalParameter('Bar', PDO::PARAM_STR))
+	 * </code>
+	 *
+	 * @param mixed $value
+	 * @param integer $type
+	 *
+	 * @return string
+	 * @since 8.2.0
+	 */
+	public function createPositionalParameter($value, $type = \PDO::PARAM_STR);
+}

lib/public/idbconnection.php

@@ -40,6 +40,22 @@ namespace OCP;
  * @since 6.0.0
  */
 interface IDBConnection {
+	/**
+	 * Gets the ExpressionBuilder for the connection.
+	 *
+	 * @return \OCP\DB\IExpressionBuilder
+	 * @since 8.2.0
+	 */
+	public function getExpressionBuilder();
+
+	/**
+	 * Gets the QueryBuilder for the connection.
+	 *
+	 * @return \OCP\DB\IQueryBuilder
+	 * @since 8.2.0
+	 */
+	public function getQueryBuilder();
+
 	/**
 	 * Used to abstract the ownCloud database access away
 	 * @param string $sql the sql query with ? placeholder for params