content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.ambari.server.orm.helpers.dbms;
  
  import java.io.IOException;
  import java.io.Writer;
  import java.util.List;
  
  import org.apache.ambari.server.orm.DBAccessor;
  import org.eclipse.persistence.exceptions.ValidationException;
  import org.eclipse.persistence.platform.database.DatabasePlatform;
  
  public class MySqlHelper extends GenericDbmsHelper {
    public MySqlHelper(DatabasePlatform databasePlatform) {
      super(databasePlatform);
    }
  
    @Override
    public boolean supportsColumnTypeChange() {
      return true;
    }
  
    @Override
    public String quoteObjectName(String name) {
      return "`" + name + "`";
    }
  
    @Override
    public StringBuilder writeColumnRenameString(StringBuilder builder, String oldName, DBAccessor.DBColumnInfo newColumnInfo) {
  
      builder.append(" CHANGE ").append(oldName).append(" ").append(newColumnInfo.getName()).append(" ");
      writeColumnType(builder, newColumnInfo);
  
      return builder;
    }
  
    @Override
    public StringBuilder writeColumnModifyString(StringBuilder builder, DBAccessor.DBColumnInfo columnInfo) {
      builder.append(" MODIFY ").append(columnInfo.getName()).append(" ");
      writeColumnType(builder, columnInfo);
      return builder;
    }
  
    @Override
    public StringBuilder writeSetNullableString(StringBuilder builder,
        String tableName, DBAccessor.DBColumnInfo columnInfo, boolean nullable) {
      builder.append(" MODIFY ").append(columnInfo.getName()).append(" ");
      writeColumnType(builder, columnInfo);
      String nullStatement = nullable ? " NULL" : " NOT NULL";
      builder.append(nullStatement);
      return builder;
    }
  
    @Override
    public String writeGetTableConstraints(String databaseName, String tableName) {
      // https://dev.mysql.com/doc/refman/5.7/en/table-constraints-table.html
      StringBuilder statement = new StringBuilder()
                                  .append("SELECT ")
                                  .append("constraints.CONSTRAINT_NAME as CONSTRAINT_NAME,")
                                      .append("constraints.CONSTRAINT_TYPE as CONSTRAINT_TYPE ")
                                  .append("FROM information_schema.TABLE_CONSTRAINTS as constraints ")
                                  .append("WHERE ")
                                      .append("constraints.TABLE_SCHEMA = \"").append(databaseName).append("\" ")
                                      .append("AND constraints.TABLE_NAME = \"").append(tableName).append("\"");
      return statement.toString();
    }
  
    @Override
    public Writer writeCreateTableStatement(Writer writer, String tableName,
                                            List<DBAccessor.DBColumnInfo> columns,
                                            List<String> primaryKeyColumns) {
      Writer defaultWriter = super.writeCreateTableStatement(writer, tableName, columns, primaryKeyColumns);
      try {
        defaultWriter.write(" ENGINE=INNODB");
      } catch (IOException e) {
        throw ValidationException.fileError(e);
      }
      return defaultWriter;
    }
  
    /**
     {@inheritDoc}
     */
    @Override
    public String getCopyColumnToAnotherTableStatement(String sourceTable, String sourceColumnName,
           String sourceIDColumnName, String targetTable, String targetColumnName, String targetIDColumnName) {
  
      return String.format("UPDATE %1$s AS a INNER JOIN %2$s AS b ON a.%5$s = b.%6$s SET a.%3$s = b.%4$s",
        targetTable, sourceTable, targetColumnName, sourceColumnName, targetIDColumnName, sourceIDColumnName);
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public String getCopyColumnToAnotherTableStatement(String sourceTable, String sourceColumnName,
                                                       String sourceIDColumnName1, String sourceIDColumnName2,
                                                       String sourceIDColumnName3,
                                                       String targetTable, String targetColumnName,
                                                       String targetIDColumnName1, String targetIDColumnName2,
                                                       String targetIDColumnName3,
                                                       String sourceConditionFieldName, String condition) {
      return String.format("UPDATE %1$s AS a INNER JOIN %2$s AS b ON a.%5$s = b.%8$s AND a.%6$s = b.%9$s AND a.%7$s = b.%10$s AND b.%11$s = '%12$s' SET a.%3$s = b.%4$s",
          targetTable, sourceTable, targetColumnName, sourceColumnName, targetIDColumnName1, targetIDColumnName2, targetIDColumnName3,
          sourceIDColumnName1, sourceIDColumnName2, sourceIDColumnName3, sourceConditionFieldName, condition);
    }
  
  }
  