org.jooq.impl.CommonTableExpressionImpl Maven / Gradle / Ivy
/*
* 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
*
* https://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.
*
* Other licenses:
* -----------------------------------------------------------------------------
* Commercial licenses for this work are available. These replace the above
* Apache-2.0 and offer limited warranties, support, maintenance, and commercial
* database integrations.
*
* For more information, please visit: https://www.jooq.org/legal/licensing
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*/
package org.jooq.impl;
// ...
// ...
// ...
import static org.jooq.SQLDialect.POSTGRES;
import static org.jooq.SQLDialect.SQLITE;
import static org.jooq.impl.DSL.selectFrom;
import static org.jooq.impl.Keywords.K_AS;
import static org.jooq.impl.Keywords.K_MATERIALIZED;
import static org.jooq.impl.Keywords.K_NOT;
import static org.jooq.impl.SubqueryCharacteristics.DERIVED_TABLE;
import static org.jooq.impl.Tools.visitSubquery;
import java.util.Set;
import org.jooq.CommonTableExpression;
import org.jooq.Context;
import org.jooq.DataType;
import org.jooq.DerivedColumnList;
import org.jooq.Field;
// ...
import org.jooq.QueryPart;
import org.jooq.Record;
// ...
import org.jooq.ResultQuery;
import org.jooq.SQLDialect;
import org.jooq.Select;
import org.jooq.Table;
import org.jooq.TableOptions;
// ...
import org.jooq.impl.QOM.Materialized;
import org.jooq.impl.Tools.SimpleDataKey;
/**
* @author Lukas Eder
*/
final class CommonTableExpressionImpl extends AbstractTable implements CommonTableExpression {
private static final Set SUPPORT_MATERIALIZED = SQLDialect.supportedBy(POSTGRES, SQLITE);
private final DerivedColumnListImpl name;
private final ResultQuery query;
private final FieldsImpl fields;
private final Materialized materialized;
CommonTableExpressionImpl(DerivedColumnListImpl name, ResultQuery query, Materialized materialized) {
super(TableOptions.expression(), name.name);
this.name = name;
this.query = query;
this.fields = fields1();
this.materialized = materialized;
}
@Override
public final Class getRecordType() {
return query.getRecordType();
}
@Override
public final boolean declaresCTE() {
return true;
}
@Override
public final boolean declaresTables() {
return true;
}
@Override
public final void accept(Context ctx) {
if (ctx.declareCTE()) {
QueryPart s = query;
ctx.visit(name);
ctx.sql(' ').visit(K_AS).sql(' ');
Object previous = null;
if (materialized != null) {
if (SUPPORT_MATERIALIZED.contains(ctx.dialect())) {
if (materialized == Materialized.MATERIALIZED)
ctx.visit(K_MATERIALIZED).sql(' ');
else
ctx.visit(K_NOT).sql(' ').visit(K_MATERIALIZED).sql(' ');
}
}
visitSubquery(ctx, s, DERIVED_TABLE);
}
else if (ctx.declareTables()
&& query instanceof Select
&& Transformations.transformInlineCTE(ctx.configuration())) {
}
else
ctx.visit(name.name);
}
@Override
final FieldsImpl fields0() {
return fields;
}
final FieldsImpl fields1() {
Field[] s = FieldsImpl.fieldsRow0((FieldsTrait) query).fields();
// [#10565] Can't reuse s.length, see explanation below
Field[] f = new Field[Tools.degree(query)];
for (int i = 0; i < f.length; i++) {
f[i] = DSL.field(
DSL.name(
name.name,
// If the CTE has no explicit column names, inherit those of the subquery
name.fieldNames.length > 0
? name.fieldNames[i]
: s[i].getUnqualifiedName()),
// [#10565] The "scalar type" can be different for a query than the first column's type
// e.g. when projecting FOR XML or FOR JSON
(DataType) (f.length == 1 ? Tools.scalarType(query) : s[i].getDataType())
);
}
return new FieldsImpl<>(f);
}
// -------------------------------------------------------------------------
// XXX: Query Object Model
// -------------------------------------------------------------------------
@Override
public final DerivedColumnList $derivedColumnList() {
return name;
}
@Override
public final ResultQuery $query() {
return query;
}
@Override
public final Materialized $materialized() {
return materialized;
}
}