org.h2.command.ddl.AlterTableDropConstraint Maven / Gradle / Ivy
/*
* Copyright 2004-2011 H2 Group. Multiple-Licensed under the H2 License,
* Version 1.0, and under the Eclipse Public License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.command.ddl;
import org.h2.command.CommandInterface;
import org.h2.constant.ErrorCode;
import org.h2.constraint.Constraint;
import org.h2.engine.Right;
import org.h2.engine.Session;
import org.h2.message.DbException;
import org.h2.schema.Schema;
/**
* This class represents the statement
* ALTER TABLE DROP CONSTRAINT
*/
public class AlterTableDropConstraint extends SchemaCommand {
private String constraintName;
private boolean ifExists;
public AlterTableDropConstraint(Session session, Schema schema, boolean ifExists) {
super(session, schema);
this.ifExists = ifExists;
}
public void setConstraintName(String string) {
constraintName = string;
}
public int update() {
session.commit(true);
Constraint constraint = getSchema().findConstraint(session, constraintName);
if (constraint == null) {
if (!ifExists) {
throw DbException.get(ErrorCode.CONSTRAINT_NOT_FOUND_1, constraintName);
}
} else {
session.getUser().checkRight(constraint.getTable(), Right.ALL);
session.getUser().checkRight(constraint.getRefTable(), Right.ALL);
session.getDatabase().removeSchemaObject(session, constraint);
}
return 0;
}
public int getType() {
return CommandInterface.ALTER_TABLE_DROP_CONSTRAINT;
}
}