/*
* 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.Comment;
import org.lealone.dbobject.DbObject;
import org.lealone.dbobject.table.Table;
import org.lealone.engine.Database;
import org.lealone.engine.Session;
import org.lealone.expression.Expression;
import org.lealone.message.DbException;
/**
* This class represents the statement
* COMMENT
*/
public class SetComment extends DefineCommand {
private String schemaName;
private String objectName;
private boolean column;
private String columnName;
private int objectType;
private Expression expr;
public SetComment(Session session) {
super(session);
}
public int update() {
session.commit(true);
Database db = session.getDatabase();
session.getUser().checkAdmin();
DbObject object = null;
int errorCode = ErrorCode.GENERAL_ERROR_1;
if (schemaName == null) {
schemaName = session.getCurrentSchemaName();
}
switch (objectType) {
case DbObject.CONSTANT:
object = db.getSchema(schemaName).getConstant(objectName);
break;
case DbObject.CONSTRAINT:
object = db.getSchema(schemaName).getConstraint(objectName);
break;
case DbObject.FUNCTION_ALIAS:
object = db.getSchema(schemaName).findFunction(objectName);
errorCode = ErrorCode.FUNCTION_ALIAS_NOT_FOUND_1;
break;
case DbObject.INDEX:
object = db.getSchema(schemaName).getIndex(objectName);
break;
case DbObject.ROLE:
schemaName = null;
object = db.findRole(objectName);
errorCode = ErrorCode.ROLE_NOT_FOUND_1;
break;
case DbObject.SCHEMA:
schemaName = null;
object = db.findSchema(objectName);
errorCode = ErrorCode.SCHEMA_NOT_FOUND_1;
break;
case DbObject.SEQUENCE:
object = db.getSchema(schemaName).getSequence(objectName);
break;
case DbObject.TABLE_OR_VIEW:
object = db.getSchema(schemaName).getTableOrView(session, objectName);
break;
case DbObject.TRIGGER:
object = db.getSchema(schemaName).findTrigger(objectName);
errorCode = ErrorCode.TRIGGER_NOT_FOUND_1;
break;
case DbObject.USER:
schemaName = null;
object = db.getUser(objectName);
break;
case DbObject.USER_DATATYPE:
schemaName = null;
object = db.findUserDataType(objectName);
errorCode = ErrorCode.USER_DATA_TYPE_ALREADY_EXISTS_1;
break;
default:
}
if (object == null) {
throw DbException.get(errorCode, objectName);
}
String text = expr.optimize(session).getValue(session).getString();
if (column) {
Table table = (Table) object;
table.getColumn(columnName).setComment(text);
} else {
object.setComment(text);
}
if (column || objectType == DbObject.TABLE_OR_VIEW || objectType == DbObject.USER || objectType == DbObject.INDEX
|| objectType == DbObject.CONSTRAINT) {
db.update(session, object);
} else {
Comment comment = db.findComment(object);
if (comment == null) {
if (text == null) {
// reset a non-existing comment - nothing to do
} else {
int id = getObjectId();
comment = new Comment(db, id, object);
comment.setCommentText(text);
db.addDatabaseObject(session, comment);
}
} else {
if (text == null) {
db.removeDatabaseObject(session, comment);
} else {
comment.setCommentText(text);
db.update(session, comment);
}
}
}
return 0;
}
public void setCommentExpression(Expression expr) {
this.expr = expr;
}
public void setObjectName(String objectName) {
this.objectName = objectName;
}
public void setObjectType(int objectType) {
this.objectType = objectType;
}
public void setColumnName(String columnName) {
this.columnName = columnName;
}
public void setSchemaName(String schemaName) {
this.schemaName = schemaName;
}
public void setColumn(boolean column) {
this.column = column;
}
public int getType() {
return CommandInterface.COMMENT;
}
}