org.h2.command.ddl.TruncateTable Maven / Gradle / Ivy
/*
* Copyright 2004-2019 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (https://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.command.ddl;
import org.h2.api.ErrorCode;
import org.h2.command.CommandInterface;
import org.h2.engine.Right;
import org.h2.engine.Session;
import org.h2.message.DbException;
import org.h2.schema.Sequence;
import org.h2.table.Column;
import org.h2.table.Table;
/**
* This class represents the statement
* TRUNCATE TABLE
*/
public class TruncateTable extends DefineCommand {
private Table table;
private boolean restart;
public TruncateTable(Session session) {
super(session);
}
public void setTable(Table table) {
this.table = table;
}
public void setRestart(boolean restart) {
this.restart = restart;
}
@Override
public int update() {
session.commit(true);
if (!table.canTruncate()) {
throw DbException.get(ErrorCode.CANNOT_TRUNCATE_1, table.getSQL(false));
}
session.getUser().checkRight(table, Right.DELETE);
table.lock(session, true, true);
table.truncate(session);
if (restart) {
for (Column column : table.getColumns()) {
Sequence sequence = column.getSequence();
if (sequence != null) {
long min = sequence.getMinValue();
if (min != sequence.getCurrentValue()) {
sequence.modify(min, null, null, null);
session.getDatabase().updateMeta(session, sequence);
}
}
}
}
return 0;
}
@Override
public int getType() {
return CommandInterface.TRUNCATE_TABLE;
}
}