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SQL support for Querydsl
There is a newer version: 6.10.1
/*
 * 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 java.sql.DatabaseMetaData;
import java.sql.SQLException;

/** {@code SQLTemplatesRegistry} is a registry for SQLTemplates instances */
public class SQLTemplatesRegistry {

  /**
   * Get the SQLTemplates instance that matches best the SQL engine of the given database metadata
   *
   * @param md database metadata
   * @return templates
   * @throws SQLException
   */
  public SQLTemplates getTemplates(DatabaseMetaData md) throws SQLException {
    return getBuilder(md).build();
  }

  /**
   * Get a SQLTemplates.Builder instance that matches best the SQL engine of the given database
   * metadata
   *
   * @param md database metadata
   * @return templates
   * @throws SQLException
   */
  public SQLTemplates.Builder getBuilder(DatabaseMetaData md) throws SQLException {
    var name = md.getDatabaseProductName().toLowerCase();
    if (name.equals("cubrid")) {
      return CUBRIDTemplates.builder();
    } else if (name.equals("apache derby")) {
      return DerbyTemplates.builder();
    } else if (name.startsWith("firebird")) {
      return FirebirdTemplates.builder();
    } else if (name.equals("h2")) {
      return H2Templates.builder();
    } else if (name.equals("hsql")) {
      return HSQLDBTemplates.builder();
    } else if (name.equals("mysql")) {
      return MySQLTemplates.builder();
    } else if (name.equals("oracle")) {
      return OracleTemplates.builder();
    } else if (name.equals("postgresql")) {
      return PostgreSQLTemplates.builder();
    } else if (name.equals("sqlite")) {
      return SQLiteTemplates.builder();
    } else if (name.startsWith("teradata")) {
      return TeradataTemplates.builder();
    } else if (name.equals("microsoft sql server")) {
      return getMssqlSqlTemplates(md);
    } else {
      return new SQLTemplates.Builder() {
        @Override
        protected SQLTemplates build(char escape, boolean quote) {
          return new SQLTemplates(Keywords.DEFAULT, "\"", escape, quote, false);
        }
      };
    }
  }

  private SQLTemplates.Builder getMssqlSqlTemplates(DatabaseMetaData md) throws SQLException {
    var databaseMajorVersion = md.getDatabaseMajorVersion();

    if (databaseMajorVersion < 9) {
      return SQLServerTemplates.builder();
    }

    if (databaseMajorVersion == 9) {
      return SQLServer2005Templates.builder();
    }

    if (databaseMajorVersion == 10) {
      return SQLServer2008Templates.builder();
    }

    return SQLServer2012Templates.builder();
  }
}