/*
* 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 java.util.ArrayList;
import org.lealone.command.CommandInterface;
import org.lealone.command.dml.Query;
import org.lealone.constant.Constants;
import org.lealone.constant.ErrorCode;
import org.lealone.dbobject.Schema;
import org.lealone.dbobject.table.Table;
import org.lealone.dbobject.table.TableView;
import org.lealone.engine.Database;
import org.lealone.engine.Session;
import org.lealone.expression.Parameter;
import org.lealone.message.DbException;
/**
* This class represents the statement
* CREATE VIEW
*/
public class CreateView extends SchemaCommand {
private Query select;
private String viewName;
private boolean ifNotExists;
private String selectSQL;
private String[] columnNames;
private String comment;
private boolean orReplace;
private boolean force;
public CreateView(Session session, Schema schema) {
super(session, schema);
}
public void setViewName(String name) {
viewName = name;
}
public void setSelect(Query select) {
this.select = select;
}
public void setIfNotExists(boolean ifNotExists) {
this.ifNotExists = ifNotExists;
}
public void setSelectSQL(String selectSQL) {
this.selectSQL = selectSQL;
}
public void setColumnNames(String[] cols) {
this.columnNames = cols;
}
public void setComment(String comment) {
this.comment = comment;
}
public void setOrReplace(boolean orReplace) {
this.orReplace = orReplace;
}
public void setForce(boolean force) {
this.force = force;
}
public int update() {
session.commit(true);
Database db = session.getDatabase();
TableView view = null;
Table old = getSchema().findTableOrView(session, viewName);
if (old != null) {
if (ifNotExists) {
return 0;
}
if (!orReplace || !Table.VIEW.equals(old.getTableType())) {
throw DbException.get(ErrorCode.VIEW_ALREADY_EXISTS_1, viewName);
}
view = (TableView) old;
}
int id = getObjectId();
String querySQL;
if (select == null) {
querySQL = selectSQL;
} else {
ArrayList<Parameter> params = select.getParameters();
if (params != null && params.size() > 0) {
throw DbException.get(ErrorCode.FEATURE_NOT_SUPPORTED_1, "parameters in views");
}
querySQL = select.getPlanSQL();
}
Session sysSession = db.getSystemSession();
try {
if (view == null) {
Schema schema = session.getDatabase().getSchema(session.getCurrentSchemaName());
sysSession.setCurrentSchema(schema);
view = new TableView(getSchema(), id, viewName, querySQL, null, columnNames, sysSession, false);
} else {
view.replace(querySQL, columnNames, sysSession, false, force);
}
} finally {
sysSession.setCurrentSchema(db.getSchema(Constants.SCHEMA_MAIN));
}
if (comment != null) {
view.setComment(comment);
}
if (old == null) {
db.addSchemaObject(session, view);
} else {
db.update(session, view);
}
return 0;
}
public int getType() {
return CommandInterface.CREATE_VIEW;
}
}