Package com.solarmetric.kodo.impl.jdbc.schema.dict

DB Dictionaries

See:
Description

Class Summary

AbstractDictionary	Abstract implementation of the DBDictionary interface for generic SQL.
DB2Dictionary	Implementation of the DBDictionary interface for IBM DB2.
GenericDictionary	Concrete implementation of the DBDictionary interface for generic SQL.
HSQLDictionary	Implementation of the DBDictionary interface for Hypersonic SQL.
HSQLTCKDictionary	Implementation of the DBDictionary interface for Hypersonic SQL, used to pass the JDO TCK.
InformixDictionary	Dictionary for Informix.
MySQLDictionary	Implementation of the DBDictionary interface for MySQL.
OracleDictionary	Implementation of the DBDictionary interface for Oracle.
OracleDictionary.EmbeddedLob
PointbaseDictionary	Implementation of the DBDictionary interface for Pointbase Embedded.
PostgresDictionary	Implementation of DBDictionary for PostgreSQL.
SQLServerDictionary	Implementation of the DBDictionary interface for MS SQLServer.
SQLTypeMap	Maps of java types to their SQL counterparts for a particular database.
SybaseDictionary	Implementation of DBDictionary for Sybase.

Package com.solarmetric.kodo.impl.jdbc.schema.dict Description

DB Dictionaries

This package provides database plugins for schema manipulation on different relational database products.

Sample Code

The following represents a sample custom dictionary:

	
package com.solarmetric.kodo.impl.jdbc.schema.dict;


import java.sql.*;


/**
 *	Implementation of the DBDictionary interface for Postgresql.
 * 
 *	@author		Abe White
 */
public class PostgresDictionary
	extends GenericDictionary
{
	public String getPlatform ()
	{
		return "Postgres";
	}


	/**
	 *	Postgres does not support locking on distinct selects.
	 */
	public String toSelect (String cols, String tables, String where, 
		String order, boolean distinct, boolean update)
	{
		String sql = super.toSelect (cols, tables, where, order, distinct,
			false);

		if (update && !distinct)
			return sql + " FOR UPDATE";
		return sql;
	}


	/**
	 *	PostgreSQL seems to use '\' as a quote character as well
	 *	as '.
	 */
	protected String stringToSQL (String string)
	{
		StringBuffer buf = new StringBuffer (string.length () + 10);
		buf.append ('\'');
		for (int i = 1; i < string.length (); i++)
		{
			if (string.charAt (i) == '\\' || string.charAt (i) == '\'')
				buf.append ('\\');
			buf.append (string.charAt (i));
		}
		buf.append ('\'');
		return buf.toString ();
	}


	protected String timestampToSQL (Timestamp val)
	{
		// postgres does not support the standard
		// {ts 'datestring'} format, but it does understand
		// just the string value of the timestamp.
		return "'" + val.toString () + "'";
	}


	protected void setupSQLTypeMap (SQLTypeMap map)
	{
		map.setUnlimitedStringType ("TEXT");
		map.setDateType ("TIMESTAMP");
		map.setBooleanType ("INT2");
		map.setByteType ("INT2");
		map.setShortType ("INT2");
		map.setDoubleType ("FLOAT");
		map.setFloatType ("FLOAT");
		map.setIntType ("INT4");
		map.setLongType ("INT8");
	}
}