org.jooq.impl.Cast Maven / Gradle / Ivy
/**
* Copyright (c) 2009-2014, Data Geekery GmbH (http://www.datageekery.com)
* All rights reserved.
*
* This work is dual-licensed
* - under the Apache Software License 2.0 (the "ASL")
* - under the jOOQ License and Maintenance Agreement (the "jOOQ License")
* =============================================================================
* You may choose which license applies to you:
*
* - If you're using this work with Open Source databases, you may choose
* either ASL or jOOQ License.
* - If you're using this work with at least one commercial database, you must
* choose jOOQ License
*
* For more information, please visit http://www.jooq.org/licenses
*
* Apache Software License 2.0:
* -----------------------------------------------------------------------------
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* jOOQ License and Maintenance Agreement:
* -----------------------------------------------------------------------------
* Data Geekery grants the Customer the non-exclusive, timely limited and
* non-transferable license to install and use the Software under the terms of
* the jOOQ License and Maintenance Agreement.
*
* This library is distributed with a LIMITED WARRANTY. See the jOOQ License
* and Maintenance Agreement for more details: http://www.jooq.org/licensing
*/
package org.jooq.impl;
import static java.util.Arrays.asList;
import static org.jooq.impl.DSL.inline;
import static org.jooq.impl.SQLDataType.BOOLEAN;
import static org.jooq.impl.SQLDataType.DOUBLE;
import static org.jooq.impl.SQLDataType.FLOAT;
import static org.jooq.impl.SQLDataType.REAL;
import static org.jooq.impl.SQLDataType.VARCHAR;
import java.sql.Date;
import java.sql.Time;
import java.sql.Timestamp;
import org.jooq.Clause;
import org.jooq.Configuration;
import org.jooq.Context;
import org.jooq.DataType;
import org.jooq.Field;
import org.jooq.QueryPart;
import org.jooq.RenderContext.CastMode;
/**
* @author Lukas Eder
*/
class Cast extends AbstractFunction {
/**
* Generated UID
*/
private static final long serialVersionUID = -6776617606751542856L;
private final Field field;
public Cast(Field field, DataType type) {
super("cast", type);
this.field = field;
}
private final DataType getSQLDataType() {
return getDataType().getSQLDataType();
}
@Override
final QueryPart getFunction0(Configuration configuration) {
switch (configuration.dialect().family()) {
/* [pro] xx
xxxx xxxxxxx
xxxxxx xxx xxxxxxxxxxxxx
xx [/pro] */
case DERBY:
return new CastDerby();
default:
return new Native();
}
}
/* [pro] xx
xxxxxxx xxxxx xxxxxxxxxx xxxxxxx xxxxxxxxxxxxxxxxx x
xxx
x xxxxxxxxx xxx
xx
xxxxxxx xxxxxx xxxxx xxxx xxxxxxxxxxxxxxxx x xxxxxxxxxxxxxxxxxxxxx
xxxxxxxxx
xxxxxx xxxxx xxxx xxxxxxxxxxxxxxxxx xxxx x
xx xx xxxxxx xxxx xxx xxxx xxxx xxxxxx xxx xxxx xxxxxx xxxxxx xxxx xx x xxxxxxxxx xxxxxxx xxxxxxxx
xx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx x
xxxxxxxxxxxxxxxxx
xxxxxxx
x
xxxxx xxxxxxxx xxxx x xxxxxxxxxx
xxxxx xxxxxx xxxxxxxx x
xxxxx xx xxxxxxxxxxxxx xx xxxx xx xxxxxxxxxxxxxx
x xxxxxxx
x xxxxx xx xxxxxxxxxx xx xxxx xx xxxxxxxxxxx
x xxxxxxx
x xxxxx xx xxxxxxxxxxx xx xxxx xx xxxxxxxxxxxx
x xxxxxx
x xxxxx xx xxxxxxxxxxxxx xx xxxx xx xxxxxxxxxx
x xxxxxx
x xxxxx xx xxxxxxxxxxxx xx xxxx xx xxxxxxxxxxxxx
x xxxxxx
x xxxxx xx xxxxxxxxxxx xx xxxx xx xxxxxxxxxxxx
x xxxxxx
xx xxx xxxxx xxxxxxx xxxxx xxx xxxxxxx
x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
x xxxxxx
x xxxxx xx xxxxxxxxxx xx xxxx xx xxxxxxxxxx xx xxxx xx xxxxxxxxxxxxxxxx
x xxxxxxx
xx xxx xxxxx xxxxx xxx xxxxxx
x xxxxxx
x
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
x
xxxxxxxxx
xxxxxx xxxxx xxxxxxxx xxxxxxxxxxxxxxxxxx xxxx x
xxxxxx xxxxx
x
x
xx [/pro] */
private class CastDerby extends Native {
/**
* Generated UID
*/
private static final long serialVersionUID = -8737153188122391258L;
@SuppressWarnings("unchecked")
private final Field asDecodeNumberToBoolean() {
// [#859] 0 => false, null => null, all else is true
return DSL.decode().value((Field) field)
.when(inline(0), inline(false))
.when(inline((Integer) null), inline((Boolean) null))
.otherwise(inline(true));
}
@SuppressWarnings("unchecked")
private final Field asDecodeVarcharToBoolean() {
Field s = (Field) field;
// [#859] '0', 'f', 'false' => false, null => null, all else is true
return DSL.decode().when(s.equal(inline("0")), inline(false))
.when(DSL.lower(s).equal(inline("false")), inline(false))
.when(DSL.lower(s).equal(inline("f")), inline(false))
.when(s.isNull(), inline((Boolean) null))
.otherwise(inline(true));
}
@SuppressWarnings("unchecked")
@Override
public final void accept(Context ctx) {
// Avoid casting bind values inside an explicit cast...
CastMode castMode = ctx.castMode();
// [#857] Interestingly, Derby does not allow for casting numeric
// types directly to VARCHAR. An intermediary cast to CHAR is needed
if (field.getDataType().isNumeric() &&
VARCHAR.equals(getSQLDataType())) {
ctx.keyword("trim").sql("(")
.keyword("cast").sql("(")
.keyword("cast").sql("(")
.castMode(CastMode.NEVER)
.visit(field)
.castMode(castMode)
.sql(" ").keyword("as").sql(" char(38))")
.sql(" ").keyword("as").sql(" ")
.keyword(getDataType(ctx.configuration()).getCastTypeName(ctx.configuration()))
.sql("))");
return;
}
// [#888] ... neither does casting character types to FLOAT (and similar)
else if (field.getDataType().isString() &&
asList(FLOAT, DOUBLE, REAL).contains(getSQLDataType())) {
ctx.keyword("cast").sql("(")
.keyword("cast").sql("(")
.castMode(CastMode.NEVER)
.visit(field)
.castMode(castMode)
.sql(" ").keyword("as").sql(" ").keyword("decimal")
.sql(") ")
.keyword("as")
.sql(" ")
.keyword(getDataType(ctx.configuration()).getCastTypeName(ctx.configuration()))
.sql(")");
return;
}
// [#859] ... neither does casting numeric types to BOOLEAN
else if (field.getDataType().isNumeric() &&
BOOLEAN.equals(getSQLDataType())) {
ctx.visit(asDecodeNumberToBoolean());
return;
}
// [#859] ... neither does casting character types to BOOLEAN
else if (field.getDataType().isString() &&
BOOLEAN.equals(getSQLDataType())) {
ctx.visit(asDecodeVarcharToBoolean());
return;
}
super.accept(ctx);
}
}
private class Native extends AbstractQueryPart {
/**
* Generated UID
*/
private static final long serialVersionUID = -8497561014419483312L;
@Override
public void accept(Context ctx) {
// Avoid casting bind values inside an explicit cast...
CastMode castMode = ctx.castMode();
// Default rendering, if no special case has applied yet
ctx.keyword("cast").sql("(")
.castMode(CastMode.NEVER)
.visit(field)
.castMode(castMode)
.sql(" ").keyword("as").sql(" ")
.keyword(getDataType(ctx.configuration()).getCastTypeName(ctx.configuration()))
.sql(")");
}
@Override
public final Clause[] clauses(Context ctx) {
return null;
}
}
}