sqllogic.java

METAmorphoses is a system for flexible and easy-to-use generation of RDF metadata directly from a re

package cz.cvut.felk.cs.metamorphoses.template;

import java.sql.*;

/**
 * <p>The simle database access layer for the processor.</p>
 * <p>
 * <b>History:</b><br/>
 * Created: 5.3.2004<br/>
 * Last change: 5.3.2004<br/>
 * </p>
 * @author Martin Svihla ([e-mail])
 */
public class SqlLogic {

	Connection conn;

	protected void connect(
		String driverName,
		String jdbcUrl,
		String user,
		String password)
		throws SQLException, ClassNotFoundException {

		String url = "";
		this.testDriver(driverName);
		url = jdbcUrl + "?user=" + user + "&password=" + password;
		this.conn = DriverManager.getConnection(url);
	}

	protected void disconnect() throws SQLException {
		this.conn.close();
	}
	
	/**
	 * execute a simple SQL query
	 * @param sqlStatement - a statement to be executed
	 * @return a result set
	 * @throws SQLException
	 */
	protected ResultSet executeQuery(String sqlStatement) throws SQLException {
		Statement s = this.conn.createStatement();
		ResultSet rs = s.executeQuery(sqlStatement);
		return rs;
	}

	/**
	* Checks whether the MySQL JDBC Driver is installed
	*       
	*/
	protected void testDriver(String driverName) throws ClassNotFoundException {
		Class.forName(driverName);
	}

}