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 org.apache.ambari.server.orm.DBAccessor;
  import org.eclipse.persistence.platform.database.DatabasePlatform;
  
  public class OracleHelper extends GenericDbmsHelper {
    public OracleHelper(DatabasePlatform databasePlatform) {
      super(databasePlatform);
    }
  
    @Override
    public boolean supportsColumnTypeChange() {
      return true;
    }
  
    @Override
    public StringBuilder writeColumnRenameString(StringBuilder builder, String oldName, DBAccessor.DBColumnInfo newColumnInfo) {
      builder.append(" RENAME COLUMN ").append(oldName).append(" TO ").append(newColumnInfo.getName());
      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());
      String nullStatement = nullable ? " NULL" : " NOT NULL";
      builder.append(nullStatement);
      return builder;
    }
  
    @Override
    public String writeGetTableConstraints(String databaseName, String tableName) {
      StringBuilder statement = new StringBuilder()
                                  .append("SELECT CONSTRAINT_NAME as constraint_name, CONSTRAINT_TYPE as constraint_type ")
                                  .append("FROM USER_CONSTRAINTS ")
                                  .append("WHERE ")
                                  .append("USER_CONSTRAINTS.TABLE_NAME='").append(tableName.toUpperCase()).append("'");
      return statement.toString();
    }
  
    /**
     * {@inheritDoc}
     * <p/>
     * Oracle supports the format:
     *
     * <pre>
     * ALTER TABLE foo ADD COLUMN bar varchar2(32) DEFAULT 'baz' NOT NULL
     * </pre>
     *
     * This syntax doesn't allow contraints added after the {@code NULL}
     * constraint.
     */
    @Override
    public boolean isConstraintSupportedAfterNullability() {
      return false;
    }
  
    /**
     {@inheritDoc}
     */
    @Override
    public String getCopyColumnToAnotherTableStatement(String sourceTable, String sourceColumnName,
           String sourceIDColumnName, String targetTable, String targetColumnName, String targetIDColumnName) {
  
      // sub-query should return only one value, ROWNUM is safe-guard for this
      return String.format("UPDATE %1$s a SET (a.%3$s) = (SELECT b.%4$s FROM %2$s b WHERE b.%6$s = a.%5$s and ROWNUM < 2)",
        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$s a SET (a.%3$s) = (SELECT b.%4$s FROM %2$s b WHERE b.%8$s = a.%5$s AND b.%9$s = a.%6$s AND b.%10$s = a.%7$s AND b.%11$s = '%12$s' AND ROWNUM < 2)",
          targetTable, sourceTable, targetColumnName, sourceColumnName, targetIDColumnName1, targetIDColumnName2, targetIDColumnName3,
          sourceIDColumnName1, sourceIDColumnName2, sourceIDColumnName3, sourceConditionFieldName, condition);
    }
  }
  