public static Dialect buildDialect(String dialectName) 
{
		try {
			return ( Dialect ) ReflectHelper.classForName( dialectName ).newInstance();
		}
		catch ( ClassNotFoundException cnfe ) {
			throw new HibernateException( "Dialect class not found: " + dialectName );
		}
		catch ( Exception e ) {
			throw new HibernateException( "Could not instantiate dialect class", e );
		}
}

Returns a dialect instance given the name of the class to use.

 public static Dialect buildDialect(Properties props,
    String databaseName,
    int databaseMajorVersion) throws HibernateException 
{
		String dialectName = props.getProperty( Environment.DIALECT );
		if ( dialectName == null ) {
			return determineDialect( databaseName, databaseMajorVersion );
		}
		else {
			return buildDialect( dialectName );
		}
}

Builds an appropriate Dialect instance.

If a dialect is explicitly named in the incoming properties, it is used. Otherwise, the database name and version (obtained from connection metadata) are used to make the dertemination.

An exception is thrown if a dialect was not explicitly set and the database name is not known.

 public static Dialect determineDialect(String databaseName,
    int databaseMajorVersion) 
{
		if ( databaseName == null ) {
			throw new HibernateException( "Hibernate Dialect must be explicitly set" );
		}
		DatabaseDialectMapper mapper = ( DatabaseDialectMapper ) MAPPERS.get( databaseName );
		if ( mapper == null ) {
			throw new HibernateException( "Hibernate Dialect must be explicitly set for database: " + databaseName );
		}
		String dialectName = mapper.getDialectClass( databaseMajorVersion );
		return buildDialect( dialectName );
}

Determine the appropriate Dialect to use given the database product name and major version.