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SQLServerDialect.java
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/
SQLServerDialect.java
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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.dialect;
import java.sql.Types;
import java.util.Locale;
import org.hibernate.LockMode;
import org.hibernate.LockOptions;
import org.hibernate.dialect.function.AnsiTrimEmulationFunction;
import org.hibernate.dialect.function.SQLFunctionTemplate;
import org.hibernate.dialect.function.StandardSQLFunction;
import org.hibernate.dialect.identity.IdentityColumnSupport;
import org.hibernate.dialect.identity.SQLServerIdentityColumnSupport;
import org.hibernate.dialect.pagination.LegacyLimitHandler;
import org.hibernate.dialect.pagination.LimitHandler;
import org.hibernate.dialect.pagination.TopLimitHandler;
import org.hibernate.type.StandardBasicTypes;
import org.hibernate.type.descriptor.sql.SmallIntTypeDescriptor;
import org.hibernate.type.descriptor.sql.SqlTypeDescriptor;
/**
* A dialect for Microsoft SQL Server 2000
*
* @author Gavin King
*/
@SuppressWarnings("deprecation")
public class SQLServerDialect extends AbstractTransactSQLDialect {
private static final int PARAM_LIST_SIZE_LIMIT = 2100;
private final LimitHandler limitHandler;
/**
* Constructs a SQLServerDialect
*/
public SQLServerDialect() {
registerColumnType( Types.VARBINARY, "image" );
registerColumnType( Types.VARBINARY, 8000, "varbinary($l)" );
registerColumnType( Types.LONGVARBINARY, "image" );
registerColumnType( Types.LONGVARCHAR, "text" );
registerColumnType( Types.BOOLEAN, "bit" );
registerFunction( "second", new SQLFunctionTemplate( StandardBasicTypes.INTEGER, "datepart(second, ?1)" ) );
registerFunction( "minute", new SQLFunctionTemplate( StandardBasicTypes.INTEGER, "datepart(minute, ?1)" ) );
registerFunction( "hour", new SQLFunctionTemplate( StandardBasicTypes.INTEGER, "datepart(hour, ?1)" ) );
registerFunction( "locate", new StandardSQLFunction( "charindex", StandardBasicTypes.INTEGER ) );
registerFunction( "extract", new SQLFunctionTemplate( StandardBasicTypes.INTEGER, "datepart(?1, ?3)" ) );
registerFunction( "mod", new SQLFunctionTemplate( StandardBasicTypes.INTEGER, "?1 % ?2" ) );
registerFunction( "bit_length", new SQLFunctionTemplate( StandardBasicTypes.INTEGER, "datalength(?1) * 8" ) );
registerFunction( "trim", new AnsiTrimEmulationFunction() );
registerKeyword( "top" );
registerKeyword( "key" );
this.limitHandler = new TopLimitHandler( false, false );
}
@Override
public String getNoColumnsInsertString() {
return "default values";
}
static int getAfterSelectInsertPoint(String sql) {
final int selectIndex = sql.toLowerCase(Locale.ROOT).indexOf( "select" );
final int selectDistinctIndex = sql.toLowerCase(Locale.ROOT).indexOf( "select distinct" );
return selectIndex + (selectDistinctIndex == selectIndex ? 15 : 6);
}
@Override
public String getLimitString(String querySelect, int offset, int limit) {
if ( offset > 0 ) {
throw new UnsupportedOperationException( "query result offset is not supported" );
}
return new StringBuilder( querySelect.length() + 8 )
.append( querySelect )
.insert( getAfterSelectInsertPoint( querySelect ), " top " + limit )
.toString();
}
@Override
public LimitHandler getLimitHandler() {
if ( isLegacyLimitHandlerBehaviorEnabled() ) {
return new LegacyLimitHandler( this );
}
return getDefaultLimitHandler();
}
protected LimitHandler getDefaultLimitHandler() {
return limitHandler;
}
@Override
public boolean supportsLimit() {
return true;
}
@Override
public boolean useMaxForLimit() {
return true;
}
@Override
public boolean supportsLimitOffset() {
return false;
}
@Override
public boolean supportsVariableLimit() {
return false;
}
@Override
public char closeQuote() {
return ']';
}
@Override
public char openQuote() {
return '[';
}
@Override
public String appendLockHint(LockOptions lockOptions, String tableName) {
final LockMode mode = lockOptions.getLockMode();
switch ( mode ) {
case UPGRADE:
case UPGRADE_NOWAIT:
case PESSIMISTIC_WRITE:
case WRITE:
return tableName + " with (updlock, rowlock)";
case PESSIMISTIC_READ:
return tableName + " with (holdlock, rowlock)";
case UPGRADE_SKIPLOCKED:
return tableName + " with (updlock, rowlock, readpast)";
default:
return tableName;
}
}
/**
* The current_timestamp is more accurate, but only known to be supported in SQL Server 7.0 and later and
* Sybase not known to support it at all
* <p/>
* {@inheritDoc}
*/
@Override
public String getCurrentTimestampSelectString() {
return "select current_timestamp";
}
// Overridden informational metadata ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@Override
public boolean areStringComparisonsCaseInsensitive() {
return true;
}
@Override
public boolean supportsResultSetPositionQueryMethodsOnForwardOnlyCursor() {
return false;
}
@Override
public boolean supportsCircularCascadeDeleteConstraints() {
// SQL Server (at least up through 2005) does not support defining
// cascade delete constraints which can circle back to the mutating
// table
return false;
}
@Override
public boolean supportsLobValueChangePropogation() {
// note: at least my local SQL Server 2005 Express shows this not working...
return false;
}
@Override
public boolean doesReadCommittedCauseWritersToBlockReaders() {
// here assume SQLServer2005 using snapshot isolation, which does not have this problem
return false;
}
@Override
public boolean doesRepeatableReadCauseReadersToBlockWriters() {
// here assume SQLServer2005 using snapshot isolation, which does not have this problem
return false;
}
@Override
protected SqlTypeDescriptor getSqlTypeDescriptorOverride(int sqlCode) {
return sqlCode == Types.TINYINT ?
SmallIntTypeDescriptor.INSTANCE :
super.getSqlTypeDescriptorOverride( sqlCode );
}
@Override
public int getInExpressionCountLimit() {
return PARAM_LIST_SIZE_LIMIT;
}
@Override
public IdentityColumnSupport getIdentityColumnSupport() {
return new SQLServerIdentityColumnSupport();
}
}