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/**********************************************************************************
 * $URL$
 * $Id$
 ***********************************************************************************
 *
 * Copyright (c) 2007, 2008 Sakai Foundation
 *
 * Licensed under the Educational Community 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.opensource.org/licenses/ECL-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.sakaiproject.db.impl;

import java.io.UnsupportedEncodingException;
import java.sql.PreparedStatement;
import java.sql.SQLException;

/**
 * methods for accessing sql service methods in a mysql database.
 */
public class BasicSqlServiceSqlMySql extends BasicSqlServiceSqlDefault
{
	/**
	 * returns a databases representation of the specified java boolean value.
	 */
	@Override
	public String getBooleanConstant(boolean value)
	{
		return value ? "true" : "false";
	}

	/**
	 * returns whether the sql exception indicates that a record already exists in a table.
	 */
	@Override
	public boolean getRecordAlreadyExists(SQLException ex)
	{
		return ex.getErrorCode() == 1062;
	}

	/**
	 * sets the value of a bytes field in the specified column. 


	 * 
	 * @param pstmt
	 *        prepared statement
	 * @param var
	 *        value to bind to the last parameter in the sql statement.
	 * @param pos
	 *        number of column of bytes field.
	 */
	@Override
	public PreparedStatement setBytes(PreparedStatement pstmt, String var, int pos) throws SQLException
	{
		// see http://bugs.sakaiproject.org/jira/browse/SAK-1737
		// MySQL setCharacterStream() is broken and truncates UTF-8
		// international characters sometimes. So use setBytes()
		// instead (just for MySQL).
		try
		{
			pstmt.setBytes(pos, var.getBytes("UTF-8"));
		}
		catch (UnsupportedEncodingException ex)
		{
			// this should never happen
			throw new SQLException(ex.getMessage());
		}
		return pstmt;
	}

	@Override
    public boolean isDeadLockError(int errorCode){        
        // perhaps due to a mysql deadlock?
        return (errorCode == 1213);
    }
}