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SQL support for Querydsl
There is a newer version: 6.9
/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * 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.querydsl.sql;

import com.querydsl.core.Tuple;
import com.querydsl.core.types.Expression;
import com.querydsl.core.types.Path;
import com.querydsl.core.types.SubQueryExpression;
import com.querydsl.sql.dml.SQLDeleteClause;
import com.querydsl.sql.dml.SQLInsertClause;
import com.querydsl.sql.dml.SQLMergeClause;
import com.querydsl.sql.dml.SQLUpdateClause;
import java.sql.Connection;
import java.util.function.Supplier;

/**
 * {@code AbstractSQLQueryFactory} is the base class for {@link SQLCommonQueryFactory}
 * implementations
 *
 * @param  query type
 * @author tiwe
 */
public abstract class AbstractSQLQueryFactory>
    implements SQLCommonQueryFactory<
        Q, SQLDeleteClause, SQLUpdateClause, SQLInsertClause, SQLMergeClause> {

  protected final Configuration configuration;

  protected final Supplier connection;

  public AbstractSQLQueryFactory(Configuration configuration, Supplier connProvider) {
    this.configuration = configuration;
    this.connection = connProvider;
  }

  @Override
  public final SQLDeleteClause delete(RelationalPath path) {
    return new SQLDeleteClause(connection, configuration, path);
  }

  @SuppressWarnings("unchecked")
  @Override
  public final Q from(RelationalPath from) {
    return (Q) query().from(from);
  }

  @SuppressWarnings("unchecked")
  @Override
  public final Q from(RelationalPath... args) {
    return (Q) query().from(args);
  }

  @SuppressWarnings("unchecked")
  @Override
  public final Q from(SubQueryExpression subQuery, Path alias) {
    return (Q) query().from(subQuery, alias);
  }

  @Override
  public final SQLInsertClause insert(RelationalPath path) {
    return new SQLInsertClause(connection, configuration, path);
  }

  @Override
  public final SQLMergeClause merge(RelationalPath path) {
    return new SQLMergeClause(connection, configuration, path);
  }

  @Override
  public final SQLUpdateClause update(RelationalPath path) {
    return new SQLUpdateClause(connection, configuration, path);
  }

  public final Configuration getConfiguration() {
    return configuration;
  }

  public final Connection getConnection() {
    return connection.get();
  }

  /**
   * Create a new SQL query with the given projection
   *
   * @param expr projection
   * @param  type of the projection
   * @return select(expr)
   */
  public abstract  AbstractSQLQuery select(Expression expr);

  /**
   * Create a new SQL query with the given projection
   *
   * @param exprs projection
   * @return select(exprs)
   */
  public abstract AbstractSQLQuery select(Expression... exprs);

  /**
   * Create a new SQL query with the given projection
   *
   * @param expr distinct projection
   * @param  type of the projection
   * @return select(distinct expr)
   */
  public abstract  AbstractSQLQuery selectDistinct(Expression expr);

  /**
   * Create a new SQL query with the given projection
   *
   * @param exprs distinct projection
   * @return select(distinct exprs)
   */
  public abstract AbstractSQLQuery selectDistinct(Expression... exprs);

  /**
   * Create a new SQL query with zero as the projection
   *
   * @return select(0)
   */
  public abstract AbstractSQLQuery selectZero();

  /**
   * Create a new SQL query with one as the projection
   *
   * @return select(1)
   */
  public abstract AbstractSQLQuery selectOne();

  /**
   * Create a new SQL query with the given projection and source
   *
   * @param expr query source and projection
   * @param  type of the projection
   * @return select(expr).from(expr)
   */
  public abstract  AbstractSQLQuery selectFrom(RelationalPath expr);
}