org.jooq.impl.ForLock Maven / Gradle / Ivy
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/*
* 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 license and offer limited warranties, support, maintenance, and
* commercial database integrations.
*
* For more information, please visit: https://www.jooq.org/legal/licensing
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package org.jooq.impl;
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import static org.jooq.SQLDialect.CUBRID;
// ...
import static org.jooq.SQLDialect.DERBY;
// ...
import static org.jooq.SQLDialect.FIREBIRD;
import static org.jooq.SQLDialect.H2;
// ...
import static org.jooq.SQLDialect.HSQLDB;
import static org.jooq.SQLDialect.IGNITE;
import static org.jooq.SQLDialect.MARIADB;
// ...
// ...
import static org.jooq.SQLDialect.MYSQL;
// ...
import static org.jooq.SQLDialect.POSTGRES;
// ...
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import static org.jooq.SQLDialect.SQLITE;
// ...
// ...
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import static org.jooq.SQLDialect.YUGABYTEDB;
import static org.jooq.impl.DSL.inline;
import static org.jooq.impl.DSL.sql;
import static org.jooq.impl.Keywords.K_FOR;
import static org.jooq.impl.Keywords.K_LOCK_IN_SHARE_MODE;
import static org.jooq.impl.Keywords.K_NOWAIT;
import static org.jooq.impl.Keywords.K_OF;
import static org.jooq.impl.Keywords.K_READPAST;
import static org.jooq.impl.Keywords.K_ROWLOCK;
import static org.jooq.impl.Keywords.K_UPDLOCK;
import static org.jooq.impl.Keywords.K_WITH;
import static org.jooq.impl.Keywords.K_WITH_LOCK;
import static org.jooq.impl.Names.N_LOCK_TIMEOUT;
import static org.jooq.impl.QueryPartCollectionView.wrap;
import static org.jooq.impl.Tools.appendSQL;
import static org.jooq.impl.Tools.prependSQL;
import static org.jooq.impl.Tools.BooleanDataKey.DATA_LOCK_WAIT_TIMEOUT_SET;
import java.util.Set;
import org.jooq.Context;
import org.jooq.Field;
import org.jooq.Keyword;
// ...
import org.jooq.QueryPart;
import org.jooq.SQLDialect;
import org.jooq.Select;
import org.jooq.Table;
import org.jooq.impl.QOM.UNotYetImplemented;
import org.jooq.impl.Tools.ExtendedDataKey;
/**
* A class wrapping a {@link Select} query's FOR UPDATE and other
* locking clauses.
*
* @author Lukas Eder
*/
final class ForLock extends AbstractQueryPart implements UNotYetImplemented {
private static final Set NO_SUPPORT_FOR_UPDATE_QUALIFIED = SQLDialect.supportedBy(DERBY, FIREBIRD, H2, HSQLDB);
private static final Set NO_SUPPORT_STANDARD_FOR_SHARE = SQLDialect.supportedUntil(MARIADB);
private static final Set EMULATE_FOR_UPDATE_WAIT_MY = SQLDialect.supportedUntil(MYSQL);
private static final Set EMULATE_FOR_UPDATE_WAIT_PG = SQLDialect.supportedBy(POSTGRES, YUGABYTEDB);
QueryPartList> forLockOf;
TableList forLockOfTables;
ForLockMode forLockMode;
ForLockWaitMode forLockWaitMode;
int forLockWait;
@Override
public final void accept(Context ctx) {
switch (forLockMode) {
case SHARE:
if (NO_SUPPORT_STANDARD_FOR_SHARE.contains(ctx.dialect()))
ctx.formatSeparator()
.visit(K_LOCK_IN_SHARE_MODE);
else
ctx.formatSeparator()
.visit(K_FOR)
.sql(' ')
.visit(forLockMode.toKeyword());
break;
case UPDATE:
case KEY_SHARE:
case NO_KEY_UPDATE:
default:
ctx.formatSeparator()
.visit(K_FOR)
.sql(' ')
.visit(forLockMode.toKeyword());
break;
}
if (Tools.isNotEmpty(forLockOf)) {
// [#4151] [#6117] Some databases don't allow for qualifying column
// names here. Copy also to TableList
ctx.qualify(!NO_SUPPORT_FOR_UPDATE_QUALIFIED.contains(ctx.dialect()) && ctx.qualify(), c -> c.sql(' ').visit(K_OF).sql(' ').visit(forLockOf));
}
else if (Tools.isNotEmpty(forLockOfTables)) {
ctx.sql(' ').visit(K_OF).sql(' ');
switch (ctx.family()) {
// Some dialects don't allow for an OF [table-names] clause
// It can be emulated by listing the table's fields, though
case DERBY: {
forLockOfTables.toSQLFields(ctx);
break;
}
// Render the OF [table-names] clause
default:
ctx.visit(wrap(forLockOfTables).qualify(false));
break;
}
}
// [#3186] Firebird's FOR UPDATE clause has a different semantics. To achieve "regular"
// FOR UPDATE semantics, we should use FOR UPDATE WITH LOCK
if (ctx.family() == FIREBIRD)
ctx.sql(' ').visit(K_WITH_LOCK);
if (forLockWaitMode != null) {
// [#11243] PostgreSQL FOR UPDATE WAIT emulation
if (forLockWaitMode == ForLockWaitMode.WAIT && EMULATE_FOR_UPDATE_WAIT_PG.contains(ctx.dialect())) {
prependSQL(ctx.skipUpdateCount(), ctx.dsl().setLocal(N_LOCK_TIMEOUT, inline(forLockWait * 1000)));
}
else if (forLockWaitMode == ForLockWaitMode.WAIT && EMULATE_FOR_UPDATE_WAIT_MY.contains(ctx.dialect())) {
if (ctx.data(DATA_LOCK_WAIT_TIMEOUT_SET) == null) {
ctx.skipUpdateCounts(2).data(DATA_LOCK_WAIT_TIMEOUT_SET, true);
prependSQL(ctx,
ctx.dsl().query("{set} @t = @@innodb_lock_wait_timeout"),
ctx.dsl().query("{set} @@innodb_lock_wait_timeout = {0}", inline(forLockWait))
);
appendSQL(ctx, ctx.dsl().query("{set} @@innodb_lock_wait_timeout = @t"));
}
}
else {
ctx.sql(' ').visit(forLockWaitMode.toKeyword());
if (forLockWaitMode == ForLockWaitMode.WAIT)
ctx.sql(' ').sql(forLockWait);
}
}
}
/**
* The lock mode for the FOR UPDATE clause, if set.
*/
static enum ForLockMode {
UPDATE("update"),
NO_KEY_UPDATE("no key update"),
SHARE("share"),
KEY_SHARE("key share"),
;
private final Keyword keyword;
private ForLockMode(String sql) {
this.keyword = DSL.keyword(sql);
}
public final Keyword toKeyword() {
return keyword;
}
}
/**
* The wait mode for the FOR UPDATE clause, if set.
*/
static enum ForLockWaitMode {
WAIT("wait"),
NOWAIT("nowait"),
SKIP_LOCKED("skip locked"),
;
private final Keyword keyword;
private ForLockWaitMode(String sql) {
this.keyword = DSL.keyword(sql);
}
public final Keyword toKeyword() {
return keyword;
}
}
}
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