/*
* Copyright 2004-2013 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.lealone.command.ddl;
import org.lealone.command.CommandInterface;
import org.lealone.constant.ErrorCode;
import org.lealone.dbobject.DbObject;
import org.lealone.dbobject.Right;
import org.lealone.dbobject.Schema;
import org.lealone.dbobject.constraint.ConstraintReferential;
import org.lealone.dbobject.table.Table;
import org.lealone.dbobject.table.TableView;
import org.lealone.engine.Session;
import org.lealone.message.DbException;
/**
* This class represents the statement
* DROP VIEW
*/
public class DropView extends SchemaCommand {
private String viewName;
private boolean ifExists;
private int dropAction;
public DropView(Session session, Schema schema) {
super(session, schema);
dropAction = session.getDatabase().getSettings().dropRestrict ? ConstraintReferential.RESTRICT
: ConstraintReferential.CASCADE;
}
public void setIfExists(boolean b) {
ifExists = b;
}
public void setDropAction(int dropAction) {
this.dropAction = dropAction;
}
public void setViewName(String viewName) {
this.viewName = viewName;
}
public int update() {
session.commit(true);
Table view = getSchema().findTableOrView(session, viewName);
if (view == null) {
if (!ifExists) {
throw DbException.get(ErrorCode.VIEW_NOT_FOUND_1, viewName);
}
} else {
if (!Table.VIEW.equals(view.getTableType())) {
throw DbException.get(ErrorCode.VIEW_NOT_FOUND_1, viewName);
}
session.getUser().checkRight(view, Right.ALL);
if (dropAction == ConstraintReferential.RESTRICT) {
for (DbObject child : view.getChildren()) {
if (child instanceof TableView) {
throw DbException.get(ErrorCode.CANNOT_DROP_2, viewName, child.getName());
}
}
}
view.lock(session, true, true);
session.getDatabase().removeSchemaObject(session, view);
}
return 0;
}
public int getType() {
return CommandInterface.DROP_VIEW;
}
}