package org.hibernate.dialect;
import java.sql.Types;
import org.hibernate.Hibernate;
import org.hibernate.LockMode;
import org.hibernate.persister.entity.Lockable;
import org.hibernate.cfg.Environment;
import org.hibernate.dialect.function.NoArgSQLFunction;
import org.hibernate.dialect.function.StandardSQLFunction;
import org.hibernate.dialect.lock.LockingStrategy;
import org.hibernate.dialect.lock.UpdateLockingStrategy;
import org.hibernate.dialect.lock.SelectLockingStrategy;
import org.hibernate.sql.JoinFragment;
import org.hibernate.sql.OracleJoinFragment;
/**
* A SQL dialect for TimesTen 5.1.
*
* Known limitations:
* joined-subclass support because of no CASE support in TimesTen
* No support for subqueries that includes aggregation
* - size() in HQL not supported
* - user queries that does subqueries with aggregation
* No CLOB/BLOB support
* No cascade delete support.
* No Calendar support
* No support for updating primary keys.
*
* @author Sherry Listgarten and Max Andersen
*/
public class TimesTenDialect extends Dialect {
public TimesTenDialect() {
super();
registerColumnType( Types.BIT, "TINYINT" );
registerColumnType( Types.BIGINT, "BIGINT" );
registerColumnType( Types.SMALLINT, "SMALLINT" );
registerColumnType( Types.TINYINT, "TINYINT" );
registerColumnType( Types.INTEGER, "INTEGER" );
registerColumnType( Types.CHAR, "CHAR(1)" );
registerColumnType( Types.VARCHAR, "VARCHAR($l)" );
registerColumnType( Types.FLOAT, "FLOAT" );
registerColumnType( Types.DOUBLE, "DOUBLE" );
registerColumnType( Types.DATE, "DATE" );
registerColumnType( Types.TIME, "TIME" );
registerColumnType( Types.TIMESTAMP, "TIMESTAMP" );
registerColumnType( Types.VARBINARY, "VARBINARY($l)" );
registerColumnType( Types.NUMERIC, "DECIMAL($p, $s)" );
// TimesTen has no BLOB/CLOB support, but these types may be suitable
// for some applications. The length is limited to 4 million bytes.
registerColumnType( Types.BLOB, "VARBINARY(4000000)" );
registerColumnType( Types.CLOB, "VARCHAR(4000000)" );
getDefaultProperties().setProperty(Environment.USE_STREAMS_FOR_BINARY, "true");
getDefaultProperties().setProperty(Environment.STATEMENT_BATCH_SIZE, DEFAULT_BATCH_SIZE);
registerFunction( "lower", new StandardSQLFunction("lower") );
registerFunction( "upper", new StandardSQLFunction("upper") );
registerFunction( "rtrim", new StandardSQLFunction("rtrim") );
registerFunction( "concat", new StandardSQLFunction("concat", Hibernate.STRING) );
registerFunction( "mod", new StandardSQLFunction("mod") );
registerFunction( "to_char", new StandardSQLFunction("to_char",Hibernate.STRING) );
registerFunction( "to_date", new StandardSQLFunction("to_date",Hibernate.TIMESTAMP) );
registerFunction( "sysdate", new NoArgSQLFunction("sysdate", Hibernate.TIMESTAMP, false) );
registerFunction( "getdate", new NoArgSQLFunction("getdate", Hibernate.TIMESTAMP, false) );
registerFunction( "nvl", new StandardSQLFunction("nvl") );
}
public boolean dropConstraints() {
return true;
}
public boolean qualifyIndexName() {
return false;
}
public boolean supportsUnique() {
return false;
}
public boolean supportsUniqueConstraintInCreateAlterTable() {
return false;
}
public String getAddColumnString() {
return "add";
}
public boolean supportsSequences() {
return true;
}
public String getSelectSequenceNextValString(String sequenceName) {
return sequenceName + ".nextval";
}
public String getSequenceNextValString(String sequenceName) {
return "select first 1 " + sequenceName + ".nextval from sys.tables";
}
public String getCreateSequenceString(String sequenceName) {
return "create sequence " + sequenceName;
}
public String getDropSequenceString(String sequenceName) {
return "drop sequence " + sequenceName;
}
public String getQuerySequencesString() {
return "select NAME from sys.sequences";
}
public JoinFragment createOuterJoinFragment() {
return new OracleJoinFragment();
}
// new methods in dialect3
/*public boolean supportsForUpdateNowait() {
return false;
}*/
public String getForUpdateString() {
return "";
}
public boolean supportsColumnCheck() {
return false;
}
public boolean supportsTableCheck() {
return false;
}
public boolean supportsLimitOffset() {
return false;
}
public boolean supportsVariableLimit() {
return false;
}
public boolean supportsLimit() {
return true;
}
public boolean useMaxForLimit() {
return true;
}
public String getLimitString(String querySelect, int offset, int limit) {
if ( offset > 0 ) {
throw new UnsupportedOperationException( "TimesTen does not support offset" );
}
return new StringBuffer( querySelect.length()+8 )
.append(querySelect)
.insert( 6, " first " + limit )
.toString();
}
public boolean supportsCurrentTimestampSelection() {
return true;
}
public String getCurrentTimestampSelectString() {
return "select first 1 sysdate from sys.tables";
}
public boolean isCurrentTimestampSelectStringCallable() {
return false;
}
public boolean supportsTemporaryTables() {
return true;
}
public String generateTemporaryTableName(String baseTableName) {
String name = super.generateTemporaryTableName(baseTableName);
return name.length() > 30 ? name.substring( 1, 30 ) : name;
}
public String getCreateTemporaryTableString() {
return "create global temporary table";
}
public String getCreateTemporaryTablePostfix() {
return "on commit delete rows";
}
public LockingStrategy getLockingStrategy(Lockable lockable, LockMode lockMode) {
// TimesTen has no known variation of a "SELECT ... FOR UPDATE" syntax...
if ( lockMode.greaterThan( LockMode.READ ) ) {
return new UpdateLockingStrategy( lockable, lockMode );
}
else {
return new SelectLockingStrategy( lockable, lockMode );
}
}
// Overridden informational metadata ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
public boolean supportsEmptyInList() {
return false;
}
}