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
parent
d2f3d18b4a
commit
da647e7deb
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@ -24,27 +24,18 @@
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*/
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*/
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package org.hibernate.dialect;
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package org.hibernate.dialect;
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import org.hibernate.Hibernate;
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import org.hibernate.QueryException;
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import org.hibernate.HibernateException;
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import org.hibernate.util.ReflectHelper;
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import org.hibernate.engine.Mapping;
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import org.hibernate.engine.SessionFactoryImplementor;
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import org.hibernate.type.Type;
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import org.hibernate.dialect.function.SQLFunction;
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import org.hibernate.dialect.function.SQLFunctionTemplate;
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import org.hibernate.dialect.function.DerbyConcatFunction;
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import org.hibernate.id.TableHiLoGenerator;
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import org.hibernate.sql.CaseFragment;
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import org.hibernate.sql.DerbyCaseFragment;
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import java.util.List;
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import java.util.ArrayList;
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import java.lang.reflect.Method;
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import java.lang.reflect.Method;
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import org.slf4j.Logger;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.slf4j.LoggerFactory;
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import org.hibernate.dialect.function.AnsiTrimFunction;
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import org.hibernate.dialect.function.DerbyConcatFunction;
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import org.hibernate.id.TableHiLoGenerator;
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import org.hibernate.sql.CaseFragment;
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import org.hibernate.sql.DerbyCaseFragment;
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import org.hibernate.util.ReflectHelper;
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/**
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/**
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* Hibernate Dialect for Cloudscape 10 - aka Derby. This implements both an
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* Hibernate Dialect for Cloudscape 10 - aka Derby. This implements both an
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* override for the identity column generator as well as for the case statement
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* override for the identity column generator as well as for the case statement
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@ -62,7 +53,7 @@ public class DerbyDialect extends DB2Dialect {
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public DerbyDialect() {
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public DerbyDialect() {
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super();
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super();
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registerFunction( "concat", new DerbyConcatFunction() );
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registerFunction( "concat", new DerbyConcatFunction() );
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registerFunction( "trim", new SQLFunctionTemplate( Hibernate.STRING, "trim(?1 ?2 ?3 ?4)" ) );
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registerFunction( "trim", new AnsiTrimFunction() );
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determineDriverVersion();
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determineDriverVersion();
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}
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}
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@ -210,124 +201,6 @@ public class DerbyDialect extends DB2Dialect {
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return null ;
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return null ;
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}
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}
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/**
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* A specialized function template to emulate the ANSI trim function on Derby DB
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* since it does not support the full trim specification. However, we cannot even
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* fully emulate it because there is not standard 'replace' function either. :(
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*/
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public static class DerbyTrimFunctionEmulation implements SQLFunction {
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private static final SQLFunction LEADING_SPACE_TRIM = new SQLFunctionTemplate( Hibernate.STRING, "ltrim( ?1 )");
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private static final SQLFunction TRAILING_SPACE_TRIM = new SQLFunctionTemplate( Hibernate.STRING, "rtrim( ?1 )");
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private static final SQLFunction BOTH_SPACE_TRIM = new SQLFunctionTemplate( Hibernate.STRING, "ltrim( rtrim( ?1 ) )");
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private static final SQLFunction BOTH_SPACE_TRIM_FROM = new SQLFunctionTemplate( Hibernate.STRING, "ltrim( rtrim( ?2 ) )");
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public Type getReturnType(Type columnType, Mapping mapping) throws QueryException {
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return Hibernate.STRING;
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}
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public boolean hasArguments() {
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return true;
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}
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public boolean hasParenthesesIfNoArguments() {
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return false;
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}
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public String render(List args, SessionFactoryImplementor factory) throws QueryException {
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// according to both the ANSI-SQL and EJB3 specs, trim can either take
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// exactly one parameter or a variable number of parameters between 1 and 4.
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// from the SQL spec:
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//
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// <trim function> ::=
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// TRIM <left paren> <trim operands> <right paren>
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//
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// <trim operands> ::=
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// [ [ <trim specification> ] [ <trim character> ] FROM ] <trim source>
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//
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// <trim specification> ::=
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// LEADING
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// | TRAILING
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// | BOTH
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//
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// If only <trim specification> is omitted, BOTH is assumed;
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// if <trim character> is omitted, space is assumed
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if ( args.size() == 1 ) {
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// we have the form: trim(trimSource)
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// so we trim leading and trailing spaces
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return BOTH_SPACE_TRIM.render( args, factory );
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}
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else if ( "from".equalsIgnoreCase( ( String ) args.get( 0 ) ) ) {
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// we have the form: trim(from trimSource).
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// This is functionally equivalent to trim(trimSource)
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return BOTH_SPACE_TRIM_FROM.render( args, factory );
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}
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else {
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// otherwise, a trim-specification and/or a trim-character
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// have been specified; we need to decide which options
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// are present and "do the right thing"
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boolean leading = true; // should leading trim-characters be trimmed?
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boolean trailing = true; // should trailing trim-characters be trimmed?
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String trimCharacter; // the trim-character
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String trimSource; // the trim-source
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// potentialTrimCharacterArgIndex = 1 assumes that a
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// trim-specification has been specified. we handle the
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// exception to that explicitly
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int potentialTrimCharacterArgIndex = 1;
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String firstArg = ( String ) args.get( 0 );
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if ( "leading".equalsIgnoreCase( firstArg ) ) {
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trailing = false;
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}
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else if ( "trailing".equalsIgnoreCase( firstArg ) ) {
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leading = false;
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}
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else if ( "both".equalsIgnoreCase( firstArg ) ) {
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}
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else {
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potentialTrimCharacterArgIndex = 0;
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}
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String potentialTrimCharacter = ( String ) args.get( potentialTrimCharacterArgIndex );
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if ( "from".equalsIgnoreCase( potentialTrimCharacter ) ) {
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trimCharacter = "' '";
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trimSource = ( String ) args.get( potentialTrimCharacterArgIndex + 1 );
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}
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else if ( potentialTrimCharacterArgIndex + 1 >= args.size() ) {
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trimCharacter = "' '";
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trimSource = potentialTrimCharacter;
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}
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else {
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trimCharacter = potentialTrimCharacter;
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if ( "from".equalsIgnoreCase( ( String ) args.get( potentialTrimCharacterArgIndex + 1 ) ) ) {
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trimSource = ( String ) args.get( potentialTrimCharacterArgIndex + 2 );
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}
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else {
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trimSource = ( String ) args.get( potentialTrimCharacterArgIndex + 1 );
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}
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}
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List argsToUse = new ArrayList();
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argsToUse.add( trimSource );
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argsToUse.add( trimCharacter );
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if ( trimCharacter.equals( "' '" ) ) {
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if ( leading && trailing ) {
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return BOTH_SPACE_TRIM.render( argsToUse, factory );
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}
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else if ( leading ) {
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return LEADING_SPACE_TRIM.render( argsToUse, factory );
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}
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else {
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return TRAILING_SPACE_TRIM.render( argsToUse, factory );
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}
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}
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else {
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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" );
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}
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}
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}
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}
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// Overridden informational metadata ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// Overridden informational metadata ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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@ -0,0 +1,45 @@
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/*
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* Hibernate, Relational Persistence for Idiomatic Java
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*
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* Copyright (c) 2009, Red Hat Inc. or third-party contributors as
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* indicated by the @author tags or express copyright attribution
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* statements applied by the authors. All third-party contributions are
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* distributed under license by Red Hat Inc.
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*
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* This copyrighted material is made available to anyone wishing to use, modify,
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* copy, or redistribute it subject to the terms and conditions of the GNU
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* Lesser General Public License, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this distribution; if not, write to:
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* Free Software Foundation, Inc.
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02110-1301 USA
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*/
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package org.hibernate.dialect.function;
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import org.hibernate.engine.SessionFactoryImplementor;
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/**
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* Defines support for rendering according to ANSI SQL <tt>TRIM<//tt> function specification.
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*
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* @author Steve Ebersole
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*/
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public class AnsiTrimFunction extends TrimFunctionTemplate {
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protected String render(Options options, String trimSource, SessionFactoryImplementor factory) {
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return new StringBuffer()
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.append( "trim(" )
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.append( options.getTrimSpecification().getName() )
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.append( ' ' )
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.append( options.getTrimCharacter() )
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.append( " from " )
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.append( trimSource )
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.append( ')' )
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.toString();
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}
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}
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@ -0,0 +1,148 @@
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/*
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* Hibernate, Relational Persistence for Idiomatic Java
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*
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* Copyright (c) 2009, Red Hat Inc. or third-party contributors as
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* indicated by the @author tags or express copyright attribution
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* statements applied by the authors. All third-party contributions are
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* distributed under license by Red Hat Inc.
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*
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* This copyrighted material is made available to anyone wishing to use, modify,
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* copy, or redistribute it subject to the terms and conditions of the GNU
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* Lesser General Public License, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this distribution; if not, write to:
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* Free Software Foundation, Inc.
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02110-1301 USA
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*/
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package org.hibernate.dialect.function;
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import java.util.List;
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import org.hibernate.Hibernate;
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import org.hibernate.QueryException;
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import org.hibernate.engine.Mapping;
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import org.hibernate.engine.SessionFactoryImplementor;
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import org.hibernate.type.Type;
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/**
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* Defines the basic template support for <tt>TRIM</tt> functions
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*
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* @author Steve Ebersole
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*/
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public abstract class TrimFunctionTemplate implements SQLFunction {
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public Type getReturnType(Type columnType, Mapping mapping) throws QueryException {
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return Hibernate.STRING;
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}
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public boolean hasArguments() {
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return true;
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}
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public boolean hasParenthesesIfNoArguments() {
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return false;
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}
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public String render(List args, SessionFactoryImplementor factory) throws QueryException {
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final Options options = new Options();
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final String trimSource;
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if ( args.size() == 1 ) {
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// we have the form: trim(trimSource)
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trimSource = ( String ) args.get( 0 );
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}
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else if ( "from".equalsIgnoreCase( ( String ) args.get( 0 ) ) ) {
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// we have the form: trim(from trimSource).
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// This is functionally equivalent to trim(trimSource)
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trimSource = ( String ) args.get( 1 );
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}
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else {
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// otherwise, a trim-specification and/or a trim-character
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// have been specified; we need to decide which options
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// are present and "do the right thing"
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//
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// potentialTrimCharacterArgIndex = 1 assumes that a
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// trim-specification has been specified. we handle the
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// exception to that explicitly
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int potentialTrimCharacterArgIndex = 1;
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String firstArg = ( String ) args.get( 0 );
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if ( "leading".equalsIgnoreCase( firstArg ) ) {
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options.setTrimSpecification( Specification.LEADING );
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}
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else if ( "trailing".equalsIgnoreCase( firstArg ) ) {
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options.setTrimSpecification( Specification.TRAILING );
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}
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else if ( "both".equalsIgnoreCase( firstArg ) ) {
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// already the default in Options
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}
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else {
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potentialTrimCharacterArgIndex = 0;
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}
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String potentialTrimCharacter = ( String ) args.get( potentialTrimCharacterArgIndex );
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if ( "from".equalsIgnoreCase( potentialTrimCharacter ) ) {
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trimSource = ( String ) args.get( potentialTrimCharacterArgIndex + 1 );
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}
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else if ( potentialTrimCharacterArgIndex + 1 >= args.size() ) {
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trimSource = potentialTrimCharacter;
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}
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else {
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options.setTrimCharacter( potentialTrimCharacter );
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if ( "from".equalsIgnoreCase( ( String ) args.get( potentialTrimCharacterArgIndex + 1 ) ) ) {
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trimSource = ( String ) args.get( potentialTrimCharacterArgIndex + 2 );
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}
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else {
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trimSource = ( String ) args.get( potentialTrimCharacterArgIndex + 1 );
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}
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}
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}
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return render( options, trimSource, factory );
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}
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protected abstract String render(Options options, String trimSource, SessionFactoryImplementor factory);
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public static class Options {
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public static final String DEFAULT_TRIM_CHARACTER = "' '";
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private String trimCharacter = DEFAULT_TRIM_CHARACTER;
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private Specification trimSpecification = Specification.BOTH;
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public String getTrimCharacter() {
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return trimCharacter;
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}
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public void setTrimCharacter(String trimCharacter) {
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this.trimCharacter = trimCharacter;
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}
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public Specification getTrimSpecification() {
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return trimSpecification;
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}
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public void setTrimSpecification(Specification trimSpecification) {
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this.trimSpecification = trimSpecification;
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}
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}
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public static class Specification {
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public static final Specification LEADING = new Specification( "leading" );
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public static final Specification TRAILING = new Specification( "trailing" );
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public static final Specification BOTH = new Specification( "both" );
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private final String name;
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private Specification(String name) {
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this.name = name;
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}
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public String getName() {
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return name;
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}
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}
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}
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