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eFaps is a framework used to map objects with or without attached files to a relational database and optional file systems (only for attaches files). Configurable access control can be provided down to object and attribute level depending on implementation and use case. Depending on requirements, events (like triggers) allow to implement business logic and to separate business logic from user interface. The framework includes integrations (e.g. webdav, full text search) and a web application as 'simple' configurable user interface. Some best practises, example web application modules (e.g. team work module) support administrators and implementers using this framework.

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/*
 * Copyright 2003 - 2011 The eFaps Team
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Revision:        $Rev: 6622 $
 * Last Changed:    $Date: 2011-06-09 21:32:14 -0500 (Thu, 09 Jun 2011) $
 * Last Changed By: $Author: [email protected] $
 */

package org.efaps.db.wrapper;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

import org.efaps.db.Context;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * An easy wrapper for a SQL update statement. To initialize this class use
 * {@link org.efaps.db.databases.AbstractDatabase#newUpdate(String, String, long)}
 * to get a database specific update.
 *
 * Example:

 * 
 * SQLUpdate insert = Context.getDbType().newUpdate("MYTABLE", "ID", 12);
 * 

 *
 * @author The eFaps Team
 * @version $Id: SQLUpdate.java 6622 2011-06-10 02:32:14Z [email protected] $
 */
public class SQLUpdate
    extends AbstractSQLInsertUpdate
{
    /**
     * Logging instance used in this class.
     */
    private static final Logger LOG = LoggerFactory.getLogger(SQLUpdate.class);

    /**
     * Id of the row which is updated.
     */
    private final long id;


    /**
     * Initializes this update. Do not call the constructor directly, instead
     * use
     * {@link org.efaps.db.databases.AbstractDatabase#newUpdate(String, String, long)}
     * to get the database specific implementation.
     *
     * @param _tableName    name of the table to update
     * @param _idCol        name of the column with the id
     * @param _id           id to update
     */
    public SQLUpdate(final String _tableName,
                     final String _idCol,
                     final long _id)
    {
        super(_tableName, _idCol);
        this.id = _id;
    }

    /**
     * Executes the SQL update.
     *
     * @param _con      SQL connection
     * @throws SQLException if update failed or the row for given {@link #id}
     *                      does not exists
     */
    public void execute(final Connection _con)
        throws SQLException
    {
        final StringBuilder cmd = new StringBuilder()
            .append(Context.getDbType().getSQLPart(SQLPart.UPDATE)).append(" ")
            .append(Context.getDbType().getTableQuote())
            .append(getTableName())
            .append(Context.getDbType().getTableQuote()).append(" ")
            .append(Context.getDbType().getSQLPart(SQLPart.SET)).append(" ");

        // append SQL values
        boolean first = true;
        for (final ColumnWithSQLValue col : getColumnWithSQLValues())  {
            if (first)  {
                first = false;
            } else  {
                cmd.append(Context.getDbType().getSQLPart(SQLPart.COMMA));
            }
            cmd.append(Context.getDbType().getColumnQuote())
                .append(col.getColumnName())
                .append(Context.getDbType().getColumnQuote())
                .append(Context.getDbType().getSQLPart(SQLPart.EQUAL))
                .append(col.getSqlValue());
        }

        // append values
        for (final AbstractColumnWithValue col : getColumnWithValues())  {
            if (first)  {
                first = false;
            } else  {
                cmd.append(Context.getDbType().getSQLPart(SQLPart.COMMA));
            }
            cmd.append(Context.getDbType().getColumnQuote())
                .append(col.getColumnName())
                .append(Context.getDbType().getColumnQuote())
                .append(Context.getDbType().getSQLPart(SQLPart.EQUAL))
                .append("?");
        }

        // append where clause
        cmd.append(" ").append(Context.getDbType().getSQLPart(SQLPart.WHERE)).append(" ")
            .append(Context.getDbType().getColumnQuote())
            .append(getIdColumn())
            .append(Context.getDbType().getColumnQuote())
            .append(Context.getDbType().getSQLPart(SQLPart.EQUAL))
            .append("?");

        if (SQLUpdate.LOG.isDebugEnabled()) {
            SQLUpdate.LOG.debug(cmd.toString());
        }

        final PreparedStatement stmt = _con.prepareStatement(cmd.toString());
        int index = 1;
        for (final AbstractColumnWithValue col : getColumnWithValues())  {
            if (SQLUpdate.LOG.isDebugEnabled()) {
                SQLUpdate.LOG.debug("    " + index + " = " + col.getValue());
            }
            col.set(index++, stmt);
        }

        if (SQLUpdate.LOG.isDebugEnabled()) {
            SQLUpdate.LOG.debug("    " + index + " = " + this.id);
        }
        stmt.setLong(index, this.id);

        try  {
            final int rows = stmt.executeUpdate();
            if (rows == 0) {
                throw new SQLException("Object for SQL table '" + getTableName()
                        + "' with id '" + this.id + "' does not exists and was not updated.");
            }
        } finally  {
            stmt.close();
        }
    }

    /**
     * Getter method for the instance variable {@link #id}.
     *
     * @return value of instance variable {@link #id}
     */
    public long getId()
    {
        return this.id;
    }
}