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- /*
- * Copyright 2004-2011 H2 Group.
- * Copyright 2011 James Moger.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
- package com.iciql;
-
- import java.lang.reflect.Field;
- import java.sql.Clob;
- import java.sql.ResultSet;
- import java.sql.SQLException;
- import java.util.ArrayList;
- import java.util.HashMap;
- import java.util.IdentityHashMap;
- import java.util.List;
-
- import com.iciql.bytecode.ClassReader;
- import com.iciql.util.JdbcUtils;
- import com.iciql.util.StatementLogger;
- import com.iciql.util.Utils;
-
- /**
- * This class represents a query.
- *
- * @param <T>
- * the return type
- */
-
- public class Query<T> {
-
- private Db db;
- private SelectTable<T> from;
- private ArrayList<Token> conditions = Utils.newArrayList();
- private ArrayList<UpdateColumn> updateColumnDeclarations = Utils.newArrayList();
- private ArrayList<SelectTable<T>> joins = Utils.newArrayList();
- private final IdentityHashMap<Object, SelectColumn<T>> aliasMap = Utils.newIdentityHashMap();
- private ArrayList<OrderExpression<T>> orderByList = Utils.newArrayList();
- private Object[] groupByExpressions;
- private long limit;
- private long offset;
-
- private Query(Db db) {
- this.db = db;
- }
-
- /**
- * from() is a static factory method to build a Query object.
- *
- * @param db
- * @param alias
- * @return a query object
- */
- @SuppressWarnings("unchecked")
- static <T> Query<T> from(Db db, T alias) {
- Query<T> query = new Query<T>(db);
- TableDefinition<T> def = (TableDefinition<T>) db.define(alias.getClass());
- query.from = new SelectTable<T>(db, query, alias, false);
- def.initSelectObject(query.from, alias, query.aliasMap);
- return query;
- }
-
- public long selectCount() {
- SQLStatement stat = getSelectStatement(false);
- stat.appendSQL("COUNT(*) ");
- appendFromWhere(stat);
- ResultSet rs = stat.executeQuery();
- try {
- rs.next();
- long value = rs.getLong(1);
- return value;
- } catch (SQLException e) {
- throw new IciqlException(e);
- } finally {
- JdbcUtils.closeSilently(rs, true);
- }
- }
-
- public List<T> select() {
- return select(false);
- }
-
- public T selectFirst() {
- return select(false).get(0);
- }
-
- public List<T> selectDistinct() {
- return select(true);
- }
-
- @SuppressWarnings("unchecked")
- public <X, Z> X selectFirst(Z x) {
- List<X> list = (List<X>) select(x);
- return list.isEmpty() ? null : list.get(0);
- }
-
- public String getSQL() {
- SQLStatement stat = getSelectStatement(false);
- stat.appendSQL("*");
- appendFromWhere(stat);
- return stat.getSQL().trim();
- }
-
- private List<T> select(boolean distinct) {
- List<T> result = Utils.newArrayList();
- TableDefinition<T> def = from.getAliasDefinition();
- SQLStatement stat = getSelectStatement(distinct);
- def.appendSelectList(stat);
- appendFromWhere(stat);
- ResultSet rs = stat.executeQuery();
- try {
- while (rs.next()) {
- T item = from.newObject();
- from.getAliasDefinition().readRow(item, rs);
- result.add(item);
- }
- } catch (SQLException e) {
- throw new IciqlException(e);
- } finally {
- JdbcUtils.closeSilently(rs, true);
- }
- return result;
- }
-
- public int delete() {
- SQLStatement stat = new SQLStatement(db);
- stat.appendSQL("DELETE FROM ");
- from.appendSQL(stat);
- appendWhere(stat);
- StatementLogger.delete(stat.getSQL());
- return stat.executeUpdate();
- }
-
- public <A> UpdateColumnSet<T, A> set(A field) {
- return new UpdateColumnSet<T, A>(this, field);
- }
-
- public <A> UpdateColumnIncrement<T, A> increment(A field) {
- return new UpdateColumnIncrement<T, A>(this, field);
- }
-
- public int update() {
- if (updateColumnDeclarations.size() == 0) {
- throw new IciqlException("Missing set or increment call.");
- }
- SQLStatement stat = new SQLStatement(db);
- stat.appendSQL("UPDATE ");
- from.appendSQL(stat);
- stat.appendSQL(" SET ");
- int i = 0;
- for (UpdateColumn declaration : updateColumnDeclarations) {
- if (i++ > 0) {
- stat.appendSQL(", ");
- }
- declaration.appendSQL(stat);
- }
- appendWhere(stat);
- StatementLogger.update(stat.getSQL());
- return stat.executeUpdate();
- }
-
- public <X, Z> List<X> selectDistinct(Z x) {
- return select(x, true);
- }
-
- public <X, Z> List<X> select(Z x) {
- return select(x, false);
- }
-
- @SuppressWarnings("unchecked")
- private <X, Z> List<X> select(Z x, boolean distinct) {
- Class<?> clazz = x.getClass();
- if (Utils.isSimpleType(clazz)) {
- return selectSimple((X) x, distinct);
- }
- clazz = clazz.getSuperclass();
- return select((Class<X>) clazz, (X) x, distinct);
- }
-
- private <X> List<X> select(Class<X> clazz, X x, boolean distinct) {
- List<X> result = Utils.newArrayList();
- TableDefinition<X> def = db.define(clazz);
- SQLStatement stat = getSelectStatement(distinct);
- def.appendSelectList(stat, this, x);
- appendFromWhere(stat);
- ResultSet rs = stat.executeQuery();
- try {
- while (rs.next()) {
- X row = Utils.newObject(clazz);
- def.readRow(row, rs);
- result.add(row);
- }
- } catch (SQLException e) {
- throw new IciqlException(e);
- } finally {
- JdbcUtils.closeSilently(rs, true);
- }
- return result;
- }
-
- @SuppressWarnings("unchecked")
- private <X> List<X> selectSimple(X x, boolean distinct) {
- SQLStatement stat = getSelectStatement(distinct);
- appendSQL(stat, x);
- appendFromWhere(stat);
- ResultSet rs = stat.executeQuery();
- List<X> result = Utils.newArrayList();
- try {
- while (rs.next()) {
- try {
- X value;
- Object o = rs.getObject(1);
- if (Clob.class.isAssignableFrom(o.getClass())) {
- value = (X) Utils.convert(o, String.class);
- } else {
- value = (X) o;
- }
- result.add(value);
- } catch (Exception e) {
- throw new IciqlException(e);
- }
- }
- } catch (SQLException e) {
- throw new IciqlException(e);
- } finally {
- JdbcUtils.closeSilently(rs, true);
- }
- return result;
- }
-
- private SQLStatement getSelectStatement(boolean distinct) {
- SQLStatement stat = new SQLStatement(db);
- stat.appendSQL("SELECT ");
- if (distinct) {
- stat.appendSQL("DISTINCT ");
- }
- return stat;
- }
-
- public <A> QueryCondition<T, A> where(A x) {
- return new QueryCondition<T, A>(this, x);
- }
-
- public <A> QueryWhere<T> where(Filter filter) {
- HashMap<String, Object> fieldMap = Utils.newHashMap();
- for (Field f : filter.getClass().getDeclaredFields()) {
- f.setAccessible(true);
- try {
- Object obj = f.get(filter);
- if (obj == from.getAlias()) {
- List<TableDefinition.FieldDefinition> fields = from.getAliasDefinition().getFields();
- String name = f.getName();
- for (TableDefinition.FieldDefinition field : fields) {
- String n = name + "." + field.field.getName();
- Object o = field.field.get(obj);
- fieldMap.put(n, o);
- }
- }
- fieldMap.put(f.getName(), f.get(filter));
- } catch (Exception e) {
- throw new IciqlException(e);
- }
- }
- Token filterCode = new ClassReader().decompile(filter, fieldMap, "where");
- // String filterQuery = filterCode.toString();
- conditions.add(filterCode);
- return new QueryWhere<T>(this);
- }
-
- public QueryWhere<T> where(String fragment, Object... args) {
- conditions.add(new RuntimeToken(fragment, args));
- return new QueryWhere<T>(this);
- }
-
- public QueryWhere<T> whereTrue(Boolean condition) {
- Token token = new Function("", condition);
- addConditionToken(token);
- return new QueryWhere<T>(this);
- }
-
- /**
- * Sets the Limit and Offset of a query.
- *
- * @return the query
- */
-
- public Query<T> limit(long limit) {
- this.limit = limit;
- return this;
- }
-
- public Query<T> offset(long offset) {
- this.offset = offset;
- return this;
- }
-
- /**
- * Order by a number of columns.
- *
- * @param expressions
- * the columns
- * @return the query
- */
-
- public Query<T> orderBy(Object... expressions) {
- for (Object expr : expressions) {
- OrderExpression<T> e = new OrderExpression<T>(this, expr, false, false, false);
- addOrderBy(e);
- }
- return this;
- }
-
- public Query<T> orderByDesc(Object expr) {
- OrderExpression<T> e = new OrderExpression<T>(this, expr, true, false, false);
- addOrderBy(e);
- return this;
- }
-
- public Query<T> groupBy(Object... groupBy) {
- this.groupByExpressions = groupBy;
- return this;
- }
-
- /**
- * INTERNAL
- *
- * @param stat
- * the statement
- * @param x
- * the alias object
- */
- public void appendSQL(SQLStatement stat, Object x) {
- if (x == Function.count()) {
- stat.appendSQL("COUNT(*)");
- return;
- }
- Token token = Db.getToken(x);
- if (token != null) {
- token.appendSQL(stat, this);
- return;
- }
- SelectColumn<T> col = aliasMap.get(x);
- if (col != null) {
- col.appendSQL(stat);
- return;
- }
- stat.appendSQL("?");
- stat.addParameter(x);
- }
-
- void addConditionToken(Token condition) {
- conditions.add(condition);
- }
-
- void addUpdateColumnDeclaration(UpdateColumn declaration) {
- updateColumnDeclarations.add(declaration);
- }
-
- void appendWhere(SQLStatement stat) {
- if (!conditions.isEmpty()) {
- stat.appendSQL(" WHERE ");
- for (Token token : conditions) {
- token.appendSQL(stat, this);
- stat.appendSQL(" ");
- }
- }
- }
-
- void appendFromWhere(SQLStatement stat) {
- stat.appendSQL(" FROM ");
- from.appendSQL(stat);
- for (SelectTable<T> join : joins) {
- join.appendSQLAsJoin(stat, this);
- }
- appendWhere(stat);
- if (groupByExpressions != null) {
- stat.appendSQL(" GROUP BY ");
- int i = 0;
- for (Object obj : groupByExpressions) {
- if (i++ > 0) {
- stat.appendSQL(", ");
- }
- appendSQL(stat, obj);
- stat.appendSQL(" ");
- }
- }
- if (!orderByList.isEmpty()) {
- stat.appendSQL(" ORDER BY ");
- int i = 0;
- for (OrderExpression<T> o : orderByList) {
- if (i++ > 0) {
- stat.appendSQL(", ");
- }
- o.appendSQL(stat);
- stat.appendSQL(" ");
- }
- }
- if (limit > 0) {
- db.getDialect().appendLimit(stat, limit);
- }
- if (offset > 0) {
- db.getDialect().appendOffset(stat, offset);
- }
- StatementLogger.select(stat.getSQL());
- }
-
- /**
- * Join another table.
- *
- * @param alias
- * an alias for the table to join
- * @return the joined query
- */
-
- @SuppressWarnings({ "unchecked", "rawtypes" })
- public <U> QueryJoin innerJoin(U alias) {
- TableDefinition<T> def = (TableDefinition<T>) db.define(alias.getClass());
- SelectTable<T> join = new SelectTable(db, this, alias, false);
- def.initSelectObject(join, alias, aliasMap);
- joins.add(join);
- return new QueryJoin(this, join);
- }
-
- Db getDb() {
- return db;
- }
-
- boolean isJoin() {
- return !joins.isEmpty();
- }
-
- SelectColumn<T> getSelectColumn(Object obj) {
- return aliasMap.get(obj);
- }
-
- void addOrderBy(OrderExpression<T> expr) {
- orderByList.add(expr);
- }
-
- }
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