Add function builder to the query builder

Signed-off-by: Robin Appelman <robin@icewind.nl>

lib/private/DB/QueryBuilder/FunctionBuilder/FunctionBuilder.php

@@ -0,0 +1,55 @@
+<?php
+/**
+ * @author Robin Appelman <robin@icewind.nl>
+ *
+ * @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\QueryBuilder\FunctionBuilder;
+
+use OC\DB\QueryBuilder\QueryFunction;
+use OC\DB\QueryBuilder\QuoteHelper;
+use OCP\DB\QueryBuilder\IFunctionBuilder;
+
+class FunctionBuilder implements IFunctionBuilder {
+	/** @var QuoteHelper */
+	protected $helper;
+
+	/**
+	 * ExpressionBuilder constructor.
+	 *
+	 * @param QuoteHelper $helper
+	 */
+	public function __construct(QuoteHelper $helper) {
+		$this->helper = $helper;
+	}
+
+	public function md5($input) {
+		return new QueryFunction('MD5(' . $this->helper->quoteColumnName($input) . ')');
+	}
+
+	public function concat($x, $y) {
+		return new QueryFunction('CONCAT(' . $this->helper->quoteColumnName($x) . ', ' . $this->helper->quoteColumnName($y) . ')');
+	}
+
+	public function substring($input, $start, $length = null) {
+		if ($length) {
+			return new QueryFunction('SUBSTR(' . $this->helper->quoteColumnName($input) . ', ' . $this->helper->quoteColumnName($start) . ', ' . $this->helper->quoteColumnName($length) . ')');
+		} else {
+			return new QueryFunction('SUBSTR(' . $this->helper->quoteColumnName($input) . ', ' . $this->helper->quoteColumnName($start) . ')');
+		}
+	}
+}

lib/private/DB/QueryBuilder/FunctionBuilder/OCIFunctionBuilder.php

@@ -0,0 +1,29 @@
+<?php
+/**
+ * @author Robin Appelman <robin@icewind.nl>
+ *
+ * @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\QueryBuilder\FunctionBuilder;
+
+use OC\DB\QueryBuilder\QueryFunction;
+
+class OCIFunctionBuilder extends FunctionBuilder {
+	public function md5($input) {
+		return new QueryFunction('LOWER(DBMS_OBFUSCATION_TOOLKIT.md5 (input => UTL_RAW.cast_to_raw(' . $this->helper->quoteColumnName($input) .')))');
+	}
+}

lib/private/DB/QueryBuilder/FunctionBuilder/PgSqlFunctionBuilder.php

@@ -0,0 +1,29 @@
+<?php
+/**
+ * @author Robin Appelman <robin@icewind.nl>
+ *
+ * @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\QueryBuilder\FunctionBuilder;
+
+use OC\DB\QueryBuilder\QueryFunction;
+
+class PgSqlFunctionBuilder extends FunctionBuilder {
+	public function concat($x, $y) {
+		return new QueryFunction($this->helper->quoteColumnName($x) . ' || ' . $this->helper->quoteColumnName($y));
+	}
+}

lib/private/DB/QueryBuilder/FunctionBuilder/SqliteFunctionBuilder.php

@@ -0,0 +1,29 @@
+<?php
+/**
+ * @author Robin Appelman <robin@icewind.nl>
+ *
+ * @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\QueryBuilder\FunctionBuilder;
+
+use OC\DB\QueryBuilder\QueryFunction;
+
+class SqliteFunctionBuilder extends FunctionBuilder {
+	public function concat($x, $y) {
+		return new QueryFunction($this->helper->quoteColumnName($x) . ' || ' . $this->helper->quoteColumnName($y));
+	}
+}

lib/private/DB/QueryBuilder/QueryBuilder.php

@@ -34,6 +34,8 @@ use OC\DB\QueryBuilder\ExpressionBuilder\OCIExpressionBuilder;
 use OC\DB\QueryBuilder\ExpressionBuilder\PgSqlExpressionBuilder;
 use OC\DB\QueryBuilder\ExpressionBuilder\SqliteExpressionBuilder;
 use OC\DB\QueryBuilder\FunctionBuilder\FunctionBuilder;
+use OC\DB\QueryBuilder\FunctionBuilder\OCIFunctionBuilder;
+use OC\DB\QueryBuilder\FunctionBuilder\PgSqlFunctionBuilder;
 use OC\DB\QueryBuilder\FunctionBuilder\SqliteFunctionBuilder;
 use OC\SystemConfig;
 use OCP\DB\QueryBuilder\IQueryBuilder;
@@ -121,6 +123,34 @@ class QueryBuilder implements IQueryBuilder {
 		}
 	}
 
+	/**
+	 * Gets an FunctionBuilder used for object-oriented construction of query functions.
+	 * This producer method is intended for convenient inline usage. Example:
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u')
+	 *         ->from('users', 'u')
+	 *         ->where($qb->fun()->md5('u.id'));
+	 * </code>
+	 *
+	 * For more complex function construction, consider storing the function
+	 * builder object in a local variable.
+	 *
+	 * @return \OCP\DB\QueryBuilder\IFunctionBuilder
+	 */
+	public function fun() {
+		if ($this->connection instanceof OracleConnection) {
+			return new OCIFunctionBuilder($this->helper);
+		} else if ($this->connection->getDatabasePlatform() instanceof SqlitePlatform) {
+			return new SqliteFunctionBuilder($this->helper);
+		} else if ($this->connection->getDatabasePlatform() instanceof PostgreSqlPlatform) {
+			return new PgSqlFunctionBuilder($this->helper);
+		} else {
+			return new FunctionBuilder($this->helper);
+		}
+	}
+
 	/**
 	 * Gets the type of the currently built query.
 	 *

lib/public/DB/QueryBuilder/IFunctionBuilder.php

@@ -0,0 +1,61 @@
+<?php
+/**
+ * @author Robin Appelman <robin@icewind.nl>
+ *
+ * @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\QueryBuilder;
+
+/**
+ * This class provides a builder for sql some functions
+ *
+ * @since 12.0.0
+ */
+interface IFunctionBuilder {
+	/**
+	 * Calculates the MD5 hash of a given input
+	 *
+	 * @param mixed $input The input to be hashed
+	 *
+	 * @return IQueryFunction
+	 * @since 12.0.0
+	 */
+	public function md5($input);
+
+	/**
+	 * Combines two input strings
+	 *
+	 * @param mixed $x The first input string
+	 * @param mixed $y The seccond input string
+	 *
+	 * @return IQueryFunction
+	 * @since 12.0.0
+	 */
+	public function concat($x, $y);
+
+	/**
+	 * Takes a substring from the input string
+	 *
+	 * @param mixed $input The input string
+	 * @param mixed $start The start of the substring, note that counting starts at 1
+	 * @param mixed $length The length of the substring
+	 *
+	 * @return IQueryFunction
+	 * @since 12.0.0
+	 */
+	public function substring($input, $start, $length = null);
+}

lib/public/DB/QueryBuilder/IQueryBuilder.php

@@ -94,6 +94,25 @@ interface IQueryBuilder {
 	 */
 	public function expr();
 
+	/**
+	 * Gets an FunctionBuilder used for object-oriented construction of query functions.
+	 * This producer method is intended for convenient inline usage. Example:
+	 *
+	 * <code>
+	 *     $qb = $conn->getQueryBuilder()
+	 *         ->select('u')
+	 *         ->from('users', 'u')
+	 *         ->where($qb->fun()->md5('u.id'));
+	 * </code>
+	 *
+	 * For more complex function construction, consider storing the function
+	 * builder object in a local variable.
+	 *
+	 * @return \OCP\DB\QueryBuilder\IFunctionBuilder
+	 * @since 12.0.0
+	 */
+	public function fun();
+
 	/**
 	 * Gets the type of the currently built query.
 	 *

tests/lib/DB/QueryBuilder/FunctionBuilderTest.php

@@ -0,0 +1,74 @@
+<?php
+/**
+ * @author Robin Appelman <robin@icewind.nl>
+ *
+ * @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 Test\DB\QueryBuilder;
+
+use OC\DB\QueryBuilder\Literal;
+use Test\TestCase;
+
+/**
+ * Class FunctionBuilderTest
+ *
+ * @group DB
+ *
+ * @package Test\DB\QueryBuilder
+ */
+class FunctionBuilderTest extends TestCase {
+	/** @var \Doctrine\DBAL\Connection|\OCP\IDBConnection */
+	protected $connection;
+
+	protected function setUp() {
+		parent::setUp();
+
+		$this->connection = \OC::$server->getDatabaseConnection();
+	}
+
+	public function testConcat() {
+		$query = $this->connection->getQueryBuilder();
+
+		$query->select($query->fun()->concat($query->createNamedParameter('foo'), new Literal("'bar'")));
+
+		$this->assertEquals('foobar', $query->execute()->fetchColumn());
+	}
+
+	public function testMd5() {
+		$query = $this->connection->getQueryBuilder();
+
+		$query->select($query->fun()->md5($query->createNamedParameter('foobar')));
+
+		$this->assertEquals(md5('foobar'), $query->execute()->fetchColumn());
+	}
+
+	public function testSubstring() {
+		$query = $this->connection->getQueryBuilder();
+
+		$query->select($query->fun()->substring($query->createNamedParameter('foobar'), new Literal(2), $query->createNamedParameter(2)));
+
+		$this->assertEquals('oo', $query->execute()->fetchColumn());
+	}
+
+	public function testSubstringNoLength() {
+		$query = $this->connection->getQueryBuilder();
+
+		$query->select($query->fun()->substring($query->createNamedParameter('foobar'), new Literal(2)));
+
+		$this->assertEquals('oobar', $query->execute()->fetchColumn());
+	}
+}