org.h2.command.ddl.DropSequence 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.Database;
import org.h2.engine.Session;
import org.h2.message.DbException;
import org.h2.schema.Schema;
import org.h2.schema.Sequence;
/**
* This class represents the statement
* DROP SEQUENCE
*/
public class DropSequence extends SchemaCommand {
private String sequenceName;
private boolean ifExists;
public DropSequence(Session session, Schema schema) {
super(session, schema);
}
public void setIfExists(boolean b) {
ifExists = b;
}
public void setSequenceName(String sequenceName) {
this.sequenceName = sequenceName;
}
@Override
public int update() {
session.getUser().checkAdmin();
session.commit(true);
Database db = session.getDatabase();
Sequence sequence = getSchema().findSequence(sequenceName);
if (sequence == null) {
if (!ifExists) {
throw DbException.get(ErrorCode.SEQUENCE_NOT_FOUND_1, sequenceName);
}
} else {
if (sequence.getBelongsToTable()) {
throw DbException.get(ErrorCode.SEQUENCE_BELONGS_TO_A_TABLE_1, sequenceName);
}
db.removeSchemaObject(session, sequence);
}
return 0;
}
@Override
public int getType() {
return CommandInterface.DROP_SEQUENCE;
}
}