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HHH-4705 - Derby does now in fact support the full ANSI SQL TRIM function 

git-svn-id: https://svn.jboss.org/repos/hibernate/core/trunk@18252 1b8cb986-b30d-0410-93ca-fae66ebed9b2
This commit is contained in:
Steve Ebersole 2009-12-16 23:15:01 +00:00
parent d2f3d18b4a
commit da647e7deb
3 changed files with 201 additions and 135 deletions
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143
core/src/main/java/org/hibernate/dialect/DerbyDialect.java
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@ -24,27 +24,18 @@
*/
package org.hibernate.dialect;
import org.hibernate.Hibernate;
import org.hibernate.QueryException;
import org.hibernate.HibernateException;
import org.hibernate.util.ReflectHelper;
import org.hibernate.engine.Mapping;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.type.Type;
import org.hibernate.dialect.function.SQLFunction;
import org.hibernate.dialect.function.SQLFunctionTemplate;
import org.hibernate.dialect.function.DerbyConcatFunction;
import org.hibernate.id.TableHiLoGenerator;
import org.hibernate.sql.CaseFragment;
import org.hibernate.sql.DerbyCaseFragment;
import java.util.List;
import java.util.ArrayList;
import java.lang.reflect.Method;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.hibernate.dialect.function.AnsiTrimFunction;
import org.hibernate.dialect.function.DerbyConcatFunction;
import org.hibernate.id.TableHiLoGenerator;
import org.hibernate.sql.CaseFragment;
import org.hibernate.sql.DerbyCaseFragment;
import org.hibernate.util.ReflectHelper;
/**
* Hibernate Dialect for Cloudscape 10 - aka Derby. This implements both an
* override for the identity column generator as well as for the case statement
@ -62,7 +53,7 @@ public class DerbyDialect extends DB2Dialect {
public DerbyDialect() {
super();
registerFunction( "concat", new DerbyConcatFunction() );
registerFunction( "trim", new SQLFunctionTemplate( Hibernate.STRING, "trim(?1 ?2 ?3 ?4)" ) );
registerFunction( "trim", new AnsiTrimFunction() );
determineDriverVersion();
}
@ -210,124 +201,6 @@ public class DerbyDialect extends DB2Dialect {
return null ;
}
/**
* A specialized function template to emulate the ANSI trim function on Derby DB
* since it does not support the full trim specification. However, we cannot even
* fully emulate it because there is not standard 'replace' function either. :(
*/
public static class DerbyTrimFunctionEmulation implements SQLFunction {
private static final SQLFunction LEADING_SPACE_TRIM = new SQLFunctionTemplate( Hibernate.STRING, "ltrim( ?1 )");
private static final SQLFunction TRAILING_SPACE_TRIM = new SQLFunctionTemplate( Hibernate.STRING, "rtrim( ?1 )");
private static final SQLFunction BOTH_SPACE_TRIM = new SQLFunctionTemplate( Hibernate.STRING, "ltrim( rtrim( ?1 ) )");
private static final SQLFunction BOTH_SPACE_TRIM_FROM = new SQLFunctionTemplate( Hibernate.STRING, "ltrim( rtrim( ?2 ) )");
public Type getReturnType(Type columnType, Mapping mapping) throws QueryException {
return Hibernate.STRING;
}
public boolean hasArguments() {
return true;
}
public boolean hasParenthesesIfNoArguments() {
return false;
}
public String render(List args, SessionFactoryImplementor factory) throws QueryException {
// according to both the ANSI-SQL and EJB3 specs, trim can either take
// exactly one parameter or a variable number of parameters between 1 and 4.
// from the SQL spec:
//
// <trim function> ::=
// TRIM <left paren> <trim operands> <right paren>
//
// <trim operands> ::=
// [ [ <trim specification> ] [ <trim character> ] FROM ] <trim source>
//
// <trim specification> ::=
// LEADING
// | TRAILING
// | BOTH
//
// If only <trim specification> is omitted, BOTH is assumed;
// if <trim character> is omitted, space is assumed
if ( args.size() == 1 ) {
// we have the form: trim(trimSource)
// so we trim leading and trailing spaces
return BOTH_SPACE_TRIM.render( args, factory );
}
else if ( "from".equalsIgnoreCase( ( String ) args.get( 0 ) ) ) {
// we have the form: trim(from trimSource).
// This is functionally equivalent to trim(trimSource)
return BOTH_SPACE_TRIM_FROM.render( args, factory );
}
else {
// otherwise, a trim-specification and/or a trim-character
// have been specified; we need to decide which options
// are present and "do the right thing"
boolean leading = true; // should leading trim-characters be trimmed?
boolean trailing = true; // should trailing trim-characters be trimmed?
String trimCharacter; // the trim-character
String trimSource; // the trim-source
// potentialTrimCharacterArgIndex = 1 assumes that a
// trim-specification has been specified. we handle the
// exception to that explicitly
int potentialTrimCharacterArgIndex = 1;
String firstArg = ( String ) args.get( 0 );
if ( "leading".equalsIgnoreCase( firstArg ) ) {
trailing = false;
}
else if ( "trailing".equalsIgnoreCase( firstArg ) ) {
leading = false;
}
else if ( "both".equalsIgnoreCase( firstArg ) ) {
}
else {
potentialTrimCharacterArgIndex = 0;
}
String potentialTrimCharacter = ( String ) args.get( potentialTrimCharacterArgIndex );
if ( "from".equalsIgnoreCase( potentialTrimCharacter ) ) {
trimCharacter = "' '";
trimSource = ( String ) args.get( potentialTrimCharacterArgIndex + 1 );
}
else if ( potentialTrimCharacterArgIndex + 1 >= args.size() ) {
trimCharacter = "' '";
trimSource = potentialTrimCharacter;
}
else {
trimCharacter = potentialTrimCharacter;
if ( "from".equalsIgnoreCase( ( String ) args.get( potentialTrimCharacterArgIndex + 1 ) ) ) {
trimSource = ( String ) args.get( potentialTrimCharacterArgIndex + 2 );
}
else {
trimSource = ( String ) args.get( potentialTrimCharacterArgIndex + 1 );
}
}
List argsToUse = new ArrayList();
argsToUse.add( trimSource );
argsToUse.add( trimCharacter );
if ( trimCharacter.equals( "' '" ) ) {
if ( leading && trailing ) {
return BOTH_SPACE_TRIM.render( argsToUse, factory );
}
else if ( leading ) {
return LEADING_SPACE_TRIM.render( argsToUse, factory );
}
else {
return TRAILING_SPACE_TRIM.render( argsToUse, factory );
}
}
else {
throw new HibernateException( "cannot specify trim character when using Derby as Derby does not support the ANSI trim function, not does it support a replace function to properly emmulate it" );
}
}
}
}
// Overridden informational metadata ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

45
core/src/main/java/org/hibernate/dialect/function/AnsiTrimFunction.java Normal file
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@ -0,0 +1,45 @@
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2009, 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.function;
import org.hibernate.engine.SessionFactoryImplementor;
/**
* Defines support for rendering according to ANSI SQL <tt>TRIM<//tt> function specification.
*
* @author Steve Ebersole
*/
public class AnsiTrimFunction extends TrimFunctionTemplate {
protected String render(Options options, String trimSource, SessionFactoryImplementor factory) {
return new StringBuffer()
.append( "trim(" )
.append( options.getTrimSpecification().getName() )
.append( ' ' )
.append( options.getTrimCharacter() )
.append( " from " )
.append( trimSource )
.append( ')' )
.toString();
}
}

148
core/src/main/java/org/hibernate/dialect/function/TrimFunctionTemplate.java Normal file
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@ -0,0 +1,148 @@
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2009, 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.function;
import java.util.List;
import org.hibernate.Hibernate;
import org.hibernate.QueryException;
import org.hibernate.engine.Mapping;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.type.Type;
/**
* Defines the basic template support for <tt>TRIM</tt> functions
*
* @author Steve Ebersole
*/
public abstract class TrimFunctionTemplate implements SQLFunction {
public Type getReturnType(Type columnType, Mapping mapping) throws QueryException {
return Hibernate.STRING;
}
public boolean hasArguments() {
return true;
}
public boolean hasParenthesesIfNoArguments() {
return false;
}
public String render(List args, SessionFactoryImplementor factory) throws QueryException {
final Options options = new Options();
final String trimSource;
if ( args.size() == 1 ) {
// we have the form: trim(trimSource)
trimSource = ( String ) args.get( 0 );
}
else if ( "from".equalsIgnoreCase( ( String ) args.get( 0 ) ) ) {
// we have the form: trim(from trimSource).
// This is functionally equivalent to trim(trimSource)
trimSource = ( String ) args.get( 1 );
}
else {
// otherwise, a trim-specification and/or a trim-character
// have been specified; we need to decide which options
// are present and "do the right thing"
//
// potentialTrimCharacterArgIndex = 1 assumes that a
// trim-specification has been specified. we handle the
// exception to that explicitly
int potentialTrimCharacterArgIndex = 1;
String firstArg = ( String ) args.get( 0 );
if ( "leading".equalsIgnoreCase( firstArg ) ) {
options.setTrimSpecification( Specification.LEADING );
}
else if ( "trailing".equalsIgnoreCase( firstArg ) ) {
options.setTrimSpecification( Specification.TRAILING );
}
else if ( "both".equalsIgnoreCase( firstArg ) ) {
// already the default in Options
}
else {
potentialTrimCharacterArgIndex = 0;
}
String potentialTrimCharacter = ( String ) args.get( potentialTrimCharacterArgIndex );
if ( "from".equalsIgnoreCase( potentialTrimCharacter ) ) {
trimSource = ( String ) args.get( potentialTrimCharacterArgIndex + 1 );
}
else if ( potentialTrimCharacterArgIndex + 1 >= args.size() ) {
trimSource = potentialTrimCharacter;
}
else {
options.setTrimCharacter( potentialTrimCharacter );
if ( "from".equalsIgnoreCase( ( String ) args.get( potentialTrimCharacterArgIndex + 1 ) ) ) {
trimSource = ( String ) args.get( potentialTrimCharacterArgIndex + 2 );
}
else {
trimSource = ( String ) args.get( potentialTrimCharacterArgIndex + 1 );
}
}
}
return render( options, trimSource, factory );
}
protected abstract String render(Options options, String trimSource, SessionFactoryImplementor factory);
public static class Options {
public static final String DEFAULT_TRIM_CHARACTER = "' '";
private String trimCharacter = DEFAULT_TRIM_CHARACTER;
private Specification trimSpecification = Specification.BOTH;
public String getTrimCharacter() {
return trimCharacter;
}
public void setTrimCharacter(String trimCharacter) {
this.trimCharacter = trimCharacter;
}
public Specification getTrimSpecification() {
return trimSpecification;
}
public void setTrimSpecification(Specification trimSpecification) {
this.trimSpecification = trimSpecification;
}
}
public static class Specification {
public static final Specification LEADING = new Specification( "leading" );
public static final Specification TRAILING = new Specification( "trailing" );
public static final Specification BOTH = new Specification( "both" );
private final String name;
private Specification(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
}