package test;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/* 简陋工具类 */
public final class JdbcUtils {
private static String url="jdbc:mysql://localhost:3306/world";
private static String user = "root";
private static String password="mysql";
static {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
throw new ExceptionInInitializerError(e);
}
}
private JdbcUtils() {}
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();
}
}
}
}
}
