package org.apache.ojb.broker.platforms;

 /* Copyright 2002-2005 The Apache Software Foundation

  *

  * 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.

  */

 import java.io.ByteArrayInputStream;

 import java.io.InputStreamReader;

 import java.io.Reader;

 import java.io.StringReader;

 import java.sql.PreparedStatement;

 import java.sql.SQLException;

 import java.sql.Types;

 import java.sql.CallableStatement;

 import java.sql.Connection;

 import org.apache.ojb.broker.query.LikeCriteria;

 /**

  * @version 1.0

  * @author jakob br�uchi

  * @version $Id: PlatformMySQLImpl.java,v 1.1 2007-08-24 22:17:35 ewestfal Exp $

  */

 public class PlatformMySQLImpl extends PlatformDefaultImpl

 {

     private static final String LAST_INSERT = "SELECT LAST_INSERT_ID() FROM ";

     private static final String LIMIT = " LIMIT 1";

     /*

          * @see Platform#setObjectForStatement(PreparedStatement, int, Object, int)

          */

     public void setObjectForStatement(PreparedStatement ps, int index, Object value, int sqlType) throws SQLException

     {

         switch (sqlType)

         {

             case Types.BIT :

                 ps.setObject(index, value);

                 break;

             case Types.BLOB :

             case Types.LONGVARBINARY :

             case Types.VARBINARY :

                 if (value instanceof byte[])

                 {

                     byte buf[] = (byte[]) value;

                     ByteArrayInputStream inputStream = new ByteArrayInputStream(buf);

                     ps.setBinaryStream(index, inputStream, buf.length);

                     break;

                 }

             case Types.CLOB :

                 Reader reader = null;

                 int length = 0;

                 if (value instanceof String)

                 {

                     reader = new StringReader((String) value);

                     length = (((String) value)).length();

                 }

                 else if (value instanceof char[])

                 {

                     String string = new String((char[])value);

                     reader = new StringReader(string);

                     length = string.length();

                 }

                 else if (value instanceof byte[])

                 {

                     byte buf[] = (byte[]) value;

                     ByteArrayInputStream inputStream = new ByteArrayInputStream(buf);

                     reader = new InputStreamReader(inputStream);

                 }

                 ps.setCharacterStream(index, reader, length);

                 break;

             default :

                 super.setObjectForStatement(ps, index, value, sqlType);

         }

     }

     /**

          * Get join syntax type for this RDBMS - one on of the constants from

          * JoinSyntaxType interface

          */

     public byte getJoinSyntaxType()

     {

         return SQL92_NOPAREN_JOIN_SYNTAX;

     }

     public String getLastInsertIdentityQuery(String tableName)

     {

         return LAST_INSERT + tableName + LIMIT;

     }

     /*

          * (non-Javadoc)

          * 

          * @see org.apache.ojb.broker.platforms.Platform#addPagingSql(java.lang.StringBuffer)

          */

     public void addPagingSql(StringBuffer anSqlString)

     {

         anSqlString.append(" LIMIT ?,?");

     }

     /* (non-Javadoc)

      * @see org.apache.ojb.broker.platforms.Platform#createSequenceQuery(String)

      */

     public String createSequenceQuery(String sequenceName)

     {

         return "insert into ojb_nextval_seq (seq_name) " + 

                         "values ('" + sequenceName + "')";

     }

     /* (non-Javadoc)

      * @see org.apache.ojb.broker.platforms.Platform#nextSequenceQuery(String)

      */

     public String nextSequenceQuery(String sequenceName)

     {

         return "select ojb_nextval_func ('" + sequenceName + "')";

     }

     /* (non-Javadoc)

      * @see org.apache.ojb.broker.platforms.Platform#dropSequenceQuery(String)

      */

     public String dropSequenceQuery(String sequenceName)

     {

         return "delete from ojb_nextval_seq where seq_name='" + 

                         sequenceName + "'";

     }

     /* (non-Javadoc)

      * Copied over from the OJB implementations for Informix

      */

     public CallableStatement prepareNextValProcedureStatement (Connection con,

                                                             String procedureName, String sequenceName) throws

                                                             PlatformException

     {

             try {

                     String sp = " { call " + procedureName + " (?,?) } ";                    

                     CallableStatement cs = con.prepareCall(sp);

                 cs.registerOutParameter(1, Types.BIGINT);

                 cs.setString(2, sequenceName);

                     return cs;

             } catch (Exception e) {

                     throw new PlatformException(e);

             }

     }

     /*

          * (non-Javadoc)

          * 

          * @see org.apache.ojb.broker.platforms.Platform#supportsPaging()

          */

     public boolean supportsPaging()

     {

         return true;

     }

     /**

      * @see org.apache.ojb.broker.platforms.Platform#concatenate(java.lang.String[])

      */

     public String concatenate(String[] theColumns)

     {

         if (theColumns.length == 1)

         {

             return theColumns[0];

         }

         StringBuffer buf = new StringBuffer();

         buf.append("concat(");

         for (int i = 0; i < theColumns.length; i++)

         {

             if (i > 0)

             {

                 buf.append(",");

             }

             buf.append(theColumns[i]);

         }

         buf.append(")");

         return buf.toString();

     }    

     /**

      * @see org.apache.ojb.broker.platforms.Platform#getEscapeClause(org.apache.ojb.broker.query.LikeCriteria)

      */

     public String getEscapeClause(LikeCriteria aCriteria)

     {

         if (LikeCriteria.getEscapeCharacter() != LikeCriteria.DEFAULT_ESCPAPE_CHARACTER)  

         {

             // the default escape character is \, so there's no need for an escape clause

             return super.getEscapeClause(aCriteria);

         }

         else

         {

             return "";

         }

     }    

 }