6ae9daf558
- [#2080] Syntax error in rendered SQL when using limit().offset() with aliased projections in SQL Server - [#3575] SQL Server doesn't support referencing column aliases in ORDER BY clause expressions
315 lines
11 KiB
Java
315 lines
11 KiB
Java
/**
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* Copyright (c) 2009-2014, Data Geekery GmbH (http://www.datageekery.com)
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* All rights reserved.
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*
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* This work is dual-licensed
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* - under the Apache Software License 2.0 (the "ASL")
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* - under the jOOQ License and Maintenance Agreement (the "jOOQ License")
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* =============================================================================
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* You may choose which license applies to you:
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*
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* - If you're using this work with Open Source databases, you may choose
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* either ASL or jOOQ License.
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* - If you're using this work with at least one commercial database, you must
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* choose jOOQ License
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*
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* For more information, please visit http://www.jooq.org/licenses
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*
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* Apache Software License 2.0:
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* -----------------------------------------------------------------------------
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* jOOQ License and Maintenance Agreement:
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* -----------------------------------------------------------------------------
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* Data Geekery grants the Customer the non-exclusive, timely limited and
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* non-transferable license to install and use the Software under the terms of
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* the jOOQ License and Maintenance Agreement.
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*
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* This library is distributed with a LIMITED WARRANTY. See the jOOQ License
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* and Maintenance Agreement for more details: http://www.jooq.org/licensing
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*/
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package org.jooq.impl;
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import static java.util.Arrays.asList;
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import static org.jooq.Clause.FIELD;
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import static org.jooq.Clause.FIELD_ALIAS;
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import static org.jooq.Clause.FIELD_REFERENCE;
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import static org.jooq.Clause.TABLE;
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import static org.jooq.Clause.TABLE_ALIAS;
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import static org.jooq.Clause.TABLE_REFERENCE;
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// ...
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import static org.jooq.SQLDialect.CUBRID;
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import static org.jooq.SQLDialect.DERBY;
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import static org.jooq.SQLDialect.FIREBIRD;
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import static org.jooq.SQLDialect.H2;
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import static org.jooq.SQLDialect.HSQLDB;
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// ...
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// ...
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import static org.jooq.SQLDialect.MARIADB;
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import static org.jooq.SQLDialect.MYSQL;
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// ...
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import static org.jooq.SQLDialect.POSTGRES;
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import static org.jooq.SQLDialect.SQLITE;
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// ...
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// ...
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import static org.jooq.impl.DSL.falseCondition;
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import static org.jooq.impl.DSL.field;
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import static org.jooq.impl.DSL.select;
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import static org.jooq.impl.Utils.DATA_OVERRIDE_ALIASES_IN_ORDER_BY;
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import static org.jooq.impl.Utils.DATA_UNALIAS_ALIASES_IN_ORDER_BY;
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import static org.jooq.impl.Utils.list;
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import org.jooq.Clause;
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import org.jooq.Context;
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import org.jooq.Field;
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import org.jooq.QueryPart;
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import org.jooq.Record;
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import org.jooq.SQLDialect;
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import org.jooq.Select;
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import org.jooq.Table;
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/**
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* @author Lukas Eder
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*/
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class Alias<Q extends QueryPart> extends AbstractQueryPart {
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private static final long serialVersionUID = -2456848365524191614L;
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private static final Clause[] CLAUSES_TABLE_REFERENCE = { TABLE, TABLE_REFERENCE };
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private static final Clause[] CLAUSES_TABLE_ALIAS = { TABLE, TABLE_ALIAS };
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private static final Clause[] CLAUSES_FIELD_REFERENCE = { FIELD, FIELD_REFERENCE };
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private static final Clause[] CLAUSES_FIELD_ALIAS = { FIELD, FIELD_ALIAS };
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private final Q wrapped;
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private final String alias;
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private final String[] fieldAliases;
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private final boolean wrapInParentheses;
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Alias(Q wrapped, String alias) {
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this(wrapped, alias, null, false);
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}
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Alias(Q wrapped, String alias, boolean wrapInParentheses) {
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this(wrapped, alias, null, wrapInParentheses);
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}
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Alias(Q wrapped, String alias, String[] fieldAliases) {
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this(wrapped, alias, fieldAliases, false);
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}
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Alias(Q wrapped, String alias, String[] fieldAliases, boolean wrapInParentheses) {
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this.wrapped = wrapped;
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this.alias = alias;
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this.fieldAliases = fieldAliases;
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this.wrapInParentheses = wrapInParentheses;
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}
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final Q wrapped() {
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return wrapped;
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}
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@Override
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public final void accept(Context<?> context) {
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if (context.declareFields() || context.declareTables()) {
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SQLDialect dialect = context.configuration().dialect();
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boolean simulateDerivedColumnList = false;
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// [#454] [#1801] Some databases don't allow "derived column names" in
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// "simple class specifications", or "common table expression references".
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// Hence, wrap the table reference in a subselect
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if (fieldAliases != null
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&& asList(CUBRID, FIREBIRD).contains(dialect.family())
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&& (wrapped instanceof TableImpl || wrapped instanceof CommonTableExpressionImpl)) {
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@SuppressWarnings("unchecked")
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Select<Record> select =
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select(list(field("*"))).from(((Table<?>) wrapped).as(alias));
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context.sql("(").formatIndentStart().formatNewLine()
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.visit(select).formatIndentEnd().formatNewLine()
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.sql(")");
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}
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// [#1801] Some databases do not support "derived column names".
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// They can be simulated by concatenating a dummy SELECT with no
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// results using UNION ALL
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else if (fieldAliases != null && asList(H2, MARIADB, MYSQL, SQLITE).contains(dialect.family())) {
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simulateDerivedColumnList = true;
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SelectFieldList fields = new SelectFieldList();
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for (String fieldAlias : fieldAliases) {
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switch (dialect.family()) {
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/* [pro] xx
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xxxx xxxxxxx x
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xx xxxxxxxxxxx xx xxxxxx xxxxxxx xxxx xxxxx xxxxxxxxx xxxxx xx x xxxxxxx xxxxxxxxx
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xx xx xxx xxxxx xxxxxxxxx xxxxxxx xx xxxxx
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xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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xxxxxx
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x
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xx [/pro] */
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default: {
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fields.add(field("null").as(fieldAlias));
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break;
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}
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}
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}
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Select<Record> select = select(fields).where(falseCondition())
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.unionAll(
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// [#3156] Do not SELECT * from derived tables to prevent ambiguously defined columns
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// in those derived tables
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wrapped instanceof Select
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? (Select<?>) wrapped
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: wrapped instanceof DerivedTable
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? ((DerivedTable<?>) wrapped).query()
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: select(field("*")).from(((Table<?>) wrapped).as(alias))
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);
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context.sql("(").formatIndentStart().formatNewLine()
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.visit(select).formatIndentEnd().formatNewLine()
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.sql(")");
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}
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// The default behaviour
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else {
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toSQLWrapped(context);
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}
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// [#291] some aliases cause trouble, if they are not explicitly marked using "as"
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toSQLAs(context);
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context.sql(" ");
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context.literal(alias);
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// [#1801] Add field aliases to the table alias, if applicable
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if (fieldAliases != null && !simulateDerivedColumnList) {
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toSQLDerivedColumnList(context);
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}
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else {
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// [#756] If the aliased object is an anonymous table (usually an
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// unnested array), then field names must be part of the alias
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// declaration. For example:
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//
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// SELECT t.column_value FROM UNNEST(ARRAY[1, 2]) AS t(column_value)
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// TODO: Is this still needed?
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switch (dialect) {
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case HSQLDB:
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case POSTGRES: {
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// The javac compiler doesn't like casting of generics
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Object o = wrapped;
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if (context.declareTables() && o instanceof ArrayTable) {
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ArrayTable table = (ArrayTable) o;
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context.sql("(");
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Utils.fieldNames(context, table.fields());
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context.sql(")");
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}
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break;
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}
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}
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}
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}
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/* [pro] xx
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xx xxxxxxx xxxxx xxxxxx xxxxx xxxxxxx xx xxx xxxxxx xxxxx xx xxxxxxx
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xxxx xx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xx xxxx xx xxxxxxx xxxxxxxxxx xxxxxx x
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xxxxxxxxxxxxxxxxxxxxxx
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x
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xx [/pro] */
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else {
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String actualAlias = alias;
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/* [pro] xx
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xx xxxxxxx xxxxxxxx xxx xxxxxx xxxxx xx xxxx x xxxxxxxxx xxxxx xx xxxxxxxxx
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xx xx xxx xxxxxx xxxxxx
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xxxxxxxx xxxxxx x xxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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xx xxxxxxx xx xxxxx x
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xxxxxxxxxx xxxxxxxxxxxxxx x xxxxxxxxxxxx xxxxxxxxxx
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xxxxxxxxxx xxxxxxxxxxxxx x xxxxxxxxxxxx xxxxxxxxxx
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xxx xxxx x x xx x x xxxxxxxxxxxxxxxxxxxxxx xxxx x
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xx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx x
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xxxxxxxxxxx x xxxxxxxxxxxxxxxxxxxxxxxxxxx
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xxxxxx
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x
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x
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x
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xx [/pro] */
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context.literal(actualAlias);
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}
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}
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static void toSQLAs(Context<?> context) {
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if (asList(DERBY, HSQLDB, MARIADB, MYSQL, POSTGRES).contains(context.configuration().dialect())) {
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context.sql(" ").keyword("as");
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}
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}
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private void toSQLWrapped(Context<?> context) {
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context.sql(wrapInParentheses ? "(" : "")
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.visit(wrapped)
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.sql(wrapInParentheses ? ")" : "");
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}
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private void toSQLDerivedColumnList(Context<?> context) {
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String separator = "";
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context.sql("(");
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for (int i = 0; i < fieldAliases.length; i++) {
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context.sql(separator);
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context.literal(fieldAliases[i]);
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separator = ", ";
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}
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context.sql(")");
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}
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@Override
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public final Clause[] clauses(Context<?> ctx) {
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if (ctx.declareFields() || ctx.declareTables()) {
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if (wrapped instanceof Table)
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return CLAUSES_TABLE_ALIAS;
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else
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return CLAUSES_FIELD_ALIAS;
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}
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else {
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if (wrapped instanceof Table)
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return CLAUSES_TABLE_REFERENCE;
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else
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return CLAUSES_FIELD_REFERENCE;
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}
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}
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@Override
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public final boolean declaresFields() {
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return true;
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}
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@Override
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public final boolean declaresTables() {
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return true;
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}
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}
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