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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2010, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.dialect;
import java.sql.Types;

import org.hibernate.HibernateException;
import org.hibernate.cfg.Environment;
import org.hibernate.dialect.function.SQLFunctionTemplate;
import org.hibernate.dialect.function.VarArgsSQLFunction;
import org.hibernate.type.StandardBasicTypes;

/**
 * A dialect for the Teradata database created by MCR as part of the
 * dialect certification process.
 *
 * @author Jay Nance
 */
public class TeradataDialect extends Dialect {
	private static final int PARAM_LIST_SIZE_LIMIT = 1024;

	/**
	 * Constructor
	 */
	public TeradataDialect() {
		super();
		//registerColumnType data types
		registerColumnType( Types.NUMERIC, "NUMERIC($p,$s)" );
		registerColumnType( Types.DOUBLE, "DOUBLE PRECISION" );
		registerColumnType( Types.BIGINT, "NUMERIC(18,0)" );
		registerColumnType( Types.BIT, "BYTEINT" );
		registerColumnType( Types.TINYINT, "BYTEINT" );
		registerColumnType( Types.VARBINARY, "VARBYTE($l)" );
		registerColumnType( Types.BINARY, "BYTEINT" );
		registerColumnType( Types.LONGVARCHAR, "LONG VARCHAR" );
		registerColumnType( Types.CHAR, "CHAR(1)" );
		registerColumnType( Types.DECIMAL, "DECIMAL" );
		registerColumnType( Types.INTEGER, "INTEGER" );
		registerColumnType( Types.SMALLINT, "SMALLINT" );
		registerColumnType( Types.FLOAT, "FLOAT" );
		registerColumnType( Types.VARCHAR, "VARCHAR($l)" );
		registerColumnType( Types.DATE, "DATE" );
		registerColumnType( Types.TIME, "TIME" );
		registerColumnType( Types.TIMESTAMP, "TIMESTAMP" );
		// hibernate seems to ignore this type...
		registerColumnType( Types.BOOLEAN, "BYTEINT" );
		registerColumnType( Types.BLOB, "BLOB" );
		registerColumnType( Types.CLOB, "CLOB" );

		registerFunction( "year", new SQLFunctionTemplate( StandardBasicTypes.INTEGER, "extract(year from ?1)" ) );
		registerFunction( "length", new SQLFunctionTemplate( StandardBasicTypes.INTEGER, "character_length(?1)" ) );
		registerFunction( "concat", new VarArgsSQLFunction( StandardBasicTypes.STRING, "(", "||", ")" ) );
		registerFunction( "substring", new SQLFunctionTemplate( StandardBasicTypes.STRING, "substring(?1 from ?2 for ?3)" ) );
		registerFunction( "locate", new SQLFunctionTemplate( StandardBasicTypes.STRING, "position(?1 in ?2)" ) );
		registerFunction( "mod", new SQLFunctionTemplate( StandardBasicTypes.STRING, "?1 mod ?2" ) );
		registerFunction( "str", new SQLFunctionTemplate( StandardBasicTypes.STRING, "cast(?1 as varchar(255))" ) );

		// bit_length feels a bit broken to me. We have to cast to char in order to
		// pass when a numeric value is supplied. But of course the answers given will
		// be wildly different for these two datatypes. 1234.5678 will be 9 bytes as
		// a char string but will be 8 or 16 bytes as a true numeric.
		// Jay Nance 2006-09-22
		registerFunction(
				"bit_length", new SQLFunctionTemplate( StandardBasicTypes.INTEGER, "octet_length(cast(?1 as char))*4" )
		);

		// The preference here would be
		//   SQLFunctionTemplate( StandardBasicTypes.TIMESTAMP, "current_timestamp(?1)", false)
		// but this appears not to work.
		// Jay Nance 2006-09-22
		registerFunction( "current_timestamp", new SQLFunctionTemplate( StandardBasicTypes.TIMESTAMP, "current_timestamp" ) );
		registerFunction( "current_time", new SQLFunctionTemplate( StandardBasicTypes.TIMESTAMP, "current_time" ) );
		registerFunction( "current_date", new SQLFunctionTemplate( StandardBasicTypes.TIMESTAMP, "current_date" ) );
		// IBID for current_time and current_date

		registerKeyword( "password" );
		registerKeyword( "type" );
		registerKeyword( "title" );
		registerKeyword( "year" );
		registerKeyword( "month" );
		registerKeyword( "summary" );
		registerKeyword( "alias" );
		registerKeyword( "value" );
		registerKeyword( "first" );
		registerKeyword( "role" );
		registerKeyword( "account" );
		registerKeyword( "class" );

		// Tell hibernate to use getBytes instead of getBinaryStream
		getDefaultProperties().setProperty( Environment.USE_STREAMS_FOR_BINARY, "false" );
		// No batch statements
		getDefaultProperties().setProperty( Environment.STATEMENT_BATCH_SIZE, NO_BATCH );
	}

	/**
	 * Teradata does not support FOR UPDATE syntax
	 * 

* {@inheritDoc} */ @Override public String getForUpdateString() { return ""; } @Override public boolean supportsIdentityColumns() { return false; } @Override public boolean supportsSequences() { return false; } @Override public String getAddColumnString() { return "Add Column"; } @Override public boolean supportsTemporaryTables() { return true; } @Override public String getCreateTemporaryTableString() { return "create global temporary table"; } @Override public String getCreateTemporaryTablePostfix() { return " on commit preserve rows"; } @Override public Boolean performTemporaryTableDDLInIsolation() { return Boolean.TRUE; } @Override public boolean dropTemporaryTableAfterUse() { return false; } @Override public String getTypeName(int code, long length, int precision, int scale) throws HibernateException { // We might want a special case for 19,2. This is very common for money types // and here it is converted to 18,1 final float f = precision > 0 ? (float) scale / (float) precision : 0; final int p = ( precision > 18 ? 18 : precision ); final int s = ( precision > 18 ? (int) ( 18.0 * f ) : ( scale > 18 ? 18 : scale ) ); return super.getTypeName( code, length, p, s ); } @Override public boolean supportsCascadeDelete() { return false; } @Override public boolean supportsCircularCascadeDeleteConstraints() { return false; } @Override public boolean areStringComparisonsCaseInsensitive() { return true; } @Override public boolean supportsEmptyInList() { return false; } @Override public String getSelectClauseNullString(int sqlType) { String v = "null"; switch ( sqlType ) { case Types.BIT: case Types.TINYINT: case Types.SMALLINT: case Types.INTEGER: case Types.BIGINT: case Types.FLOAT: case Types.REAL: case Types.DOUBLE: case Types.NUMERIC: case Types.DECIMAL: v = "cast(null as decimal)"; break; case Types.CHAR: case Types.VARCHAR: case Types.LONGVARCHAR: v = "cast(null as varchar(255))"; break; case Types.DATE: case Types.TIME: case Types.TIMESTAMP: v = "cast(null as timestamp)"; break; case Types.BINARY: case Types.VARBINARY: case Types.LONGVARBINARY: case Types.NULL: case Types.OTHER: case Types.JAVA_OBJECT: case Types.DISTINCT: case Types.STRUCT: case Types.ARRAY: case Types.BLOB: case Types.CLOB: case Types.REF: case Types.DATALINK: case Types.BOOLEAN: break; default: break; } return v; } @Override public String getCreateMultisetTableString() { return "create multiset table "; } @Override public boolean supportsLobValueChangePropogation() { return false; } @Override public boolean doesReadCommittedCauseWritersToBlockReaders() { return true; } @Override public boolean doesRepeatableReadCauseReadersToBlockWriters() { return true; } @Override public boolean supportsBindAsCallableArgument() { return false; } @Override public int getInExpressionCountLimit() { return PARAM_LIST_SIZE_LIMIT; } }





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