package cn.itsource.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

public class JDBCUtil {

    private static JDBCUtil instance = null;

    private static Properties p = null;

    private JDBCUtil() {

    }

    static {
        try {
            p = new Properties();
            p.load(Thread.currentThread().getContextClassLoader()
                    .getResourceAsStream("jdbc.properties"));
            Class.forName(p.getProperty("driverClassname"));
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        instance = new JDBCUtil();
    }

    public Connection getConnection() {
        try {
            return DriverManager.getConnection(p.getProperty("url"),
                    p.getProperty("username"), p.getProperty("password"));
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }

    public static JDBCUtil getInstance() {

        return instance;
    }

    public void close(ResultSet rs, Statement st, Connection conn) {

        try {
            if (rs != null)
                rs.close();
        } catch (SQLException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } finally {
            try {
                if (st != null)
                    st.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } finally {
                try {
                    if (conn != null)
                        conn.close();
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }
}