org.jooq.impl.RowSubqueryCondition Maven / Gradle / Ivy
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* Copyright (c) 2009-2016, Data Geekery GmbH (http://www.datageekery.com)
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* Licensed under the Apache License, Version 2.0 (the "License");
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package org.jooq.impl;
import static java.util.Arrays.asList;
import static org.jooq.Clause.CONDITION;
import static org.jooq.Clause.CONDITION_COMPARISON;
import static org.jooq.Comparator.EQUALS;
import static org.jooq.Comparator.IN;
import static org.jooq.Comparator.NOT_EQUALS;
import static org.jooq.Comparator.NOT_IN;
import static org.jooq.SQLDialect.H2;
import static org.jooq.SQLDialect.HSQLDB;
import static org.jooq.SQLDialect.MARIADB;
import static org.jooq.SQLDialect.MYSQL;
// ...
import static org.jooq.SQLDialect.POSTGRES;
// ...
import static org.jooq.impl.DSL.exists;
import static org.jooq.impl.DSL.field;
import static org.jooq.impl.DSL.name;
import static org.jooq.impl.DSL.notExists;
import static org.jooq.impl.DSL.row;
import static org.jooq.impl.DSL.select;
import static org.jooq.impl.Tools.EMPTY_STRING;
import static org.jooq.impl.Tools.DataKey.DATA_ROW_VALUE_EXPRESSION_PREDICATE_SUBQUERY;
import java.util.ArrayList;
import java.util.List;
import org.jooq.Clause;
import org.jooq.Comparator;
import org.jooq.Condition;
import org.jooq.Configuration;
import org.jooq.Context;
import org.jooq.Field;
import org.jooq.QuantifiedSelect;
import org.jooq.QueryPartInternal;
import org.jooq.Record;
import org.jooq.RenderContext;
import org.jooq.Row;
import org.jooq.RowN;
import org.jooq.SQLDialect;
import org.jooq.Select;
/**
* @author Lukas Eder
*/
final class RowSubqueryCondition extends AbstractCondition {
/**
* Generated UID
*/
private static final long serialVersionUID = -1806139685201770706L;
private static final Clause[] CLAUSES = { CONDITION, CONDITION_COMPARISON };
private final Row left;
private final Select right;
private final QuantifiedSelect rightQuantified;
private final Comparator comparator;
RowSubqueryCondition(Row left, Select right, Comparator comparator) {
this.left = left;
this.right = right;
this.rightQuantified = null;
this.comparator = comparator;
}
RowSubqueryCondition(Row left, QuantifiedSelect right, Comparator comparator) {
this.left = left;
this.right = null;
this.rightQuantified = right;
this.comparator = comparator;
}
@Override
public final void accept(Context ctx) {
ctx.visit(delegate(ctx));
}
@Override
public final Clause[] clauses(Context ctx) {
return null;
}
private final QueryPartInternal delegate(Context ctx) {
final Configuration configuration = ctx.configuration();
final RenderContext render = ctx instanceof RenderContext ? (RenderContext) ctx : null;
SQLDialect family = configuration.dialect().family();
// [#3505] TODO: Emulate this where it is not supported
if (rightQuantified != null) {
return new Native();
}
// [#2395] These dialects have full native support for comparison
// predicates with row value expressions and subqueries:
else if (asList(H2, HSQLDB, MARIADB, MYSQL, POSTGRES).contains(family)) {
return new Native();
}
// [#2395] All other configurations have to be emulated
else {
String table = render == null ? "t" : render.nextAlias();
List names = new ArrayList();
for (int i = 0; i < left.size(); i++) {
names.add(table + "_" + i);
}
Field[] fields = new Field[names.size()];
for (int i = 0; i < fields.length; i++) {
fields[i] = field(name(table, names.get(i)));
}
Condition condition;
switch (comparator) {
case GREATER:
condition = ((RowN) left).gt(row(fields));
break;
case GREATER_OR_EQUAL:
condition = ((RowN) left).ge(row(fields));
break;
case LESS:
condition = ((RowN) left).lt(row(fields));
break;
case LESS_OR_EQUAL:
condition = ((RowN) left).le(row(fields));
break;
case IN:
case EQUALS:
case NOT_IN:
case NOT_EQUALS:
default:
condition = ((RowN) left).eq(row(fields));
break;
}
Select subselect =
select().from(right.asTable(table, names.toArray(EMPTY_STRING)))
.where(condition);
switch (comparator) {
case NOT_IN:
case NOT_EQUALS:
return (QueryPartInternal) notExists(subselect);
default:
return (QueryPartInternal) exists(subselect);
}
}
}
private class Native extends AbstractCondition {
/**
* Generated UID
*/
private static final long serialVersionUID = -1552476981094856727L;
@Override
public final void accept(Context ctx) {
boolean subquery = ctx.subquery();
ctx.visit(left)
.sql(' ')
.keyword(comparator.toSQL())
.sql(' ');
if (rightQuantified == null) {
// Some databases need extra parentheses around the RHS
boolean extraParentheses = asList().contains(ctx.family());
ctx.sql(extraParentheses ? "((" : "(");
ctx.data(DATA_ROW_VALUE_EXPRESSION_PREDICATE_SUBQUERY, true);
ctx.subquery(true)
.formatIndentStart()
.formatNewLine()
.visit(right)
.formatIndentEnd()
.formatNewLine()
.subquery(subquery);
ctx.data(DATA_ROW_VALUE_EXPRESSION_PREDICATE_SUBQUERY, null);
ctx.sql(extraParentheses ? "))" : ")");
}
// [#2054] Quantified row value expression comparison predicates shouldn't have parentheses before ANY or ALL
else {
ctx.data(DATA_ROW_VALUE_EXPRESSION_PREDICATE_SUBQUERY, true);
ctx.subquery(true)
.visit(rightQuantified)
.subquery(subquery);
ctx.data(DATA_ROW_VALUE_EXPRESSION_PREDICATE_SUBQUERY, null);
}
}
@Override
public final Clause[] clauses(Context ctx) {
return CLAUSES;
}
}
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