[java]
import java.sql.*;
import javax.sql.*;
public final class JdbcUtil {
/**
* @param args
*/
private static String url = "jdbc:mysql://localhost:3306/jdbc"; // jdbc:mysql:///jdbc 本地默认端口可以省略
private static String user = "root"; www.2cto.com
private static String password = "123456";
private JdbcUtil() { }
static {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
throw new ExceptionInInitializerError(e);
}
}
public static Connection getConnection() throws SQLException{
return DriverManager.getConnection(url, user, password);
}
public static void free(ResultSet rs, Statement st, Connection conn) {
try {
if (rs != null) {
rs.close();
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (st != null) {
st.close();
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
}
}
static块用来注册驱动
getConnection函数用来获取连接
free函数用来安全的释放资源