如何在MySQL中用不同的参数更新查询

环境

Node.js，MySQL（使用node-mysql library连接）

首先

我可以有one argument 'aaa'或two arguments 'aaa' and 'bbb' 。

 UPDATE user SET email = 'aaa' WHERE uid = 'xxx'; UPDATE user SET email = 'aaa', password = 'bbb' WHERE uid = 'xxx'; 

我的问题

我怎么能用一个查询来克服上述情况？ 像下面…

 var sql = "UPDATE user SET email = ?, password = ? WHERE uid = ?;" dbclient.query(sql, [email, password, uid], function (err, results) { ... }); 

1. 如果defined两个参数，variablessql是：

    sql = "UPDATE user SET email = '[e-mail]', password = 'abcd' WHERE uid = 1;"; 

2. 如果某个参数undefined ，variablessql是：

    sql = "UPDATE user SET email = '[e-mail]', password = password WHERE uid = 1;"; 

Answer 1

请阅读文档，特别是转义查询值部分。 node-mysql支持一些整洁的对象序列化的使用。

下面的例子应该是你想要的（它使用格式，但内部query()也是如此）：

 var mysql = require( 'mysql' ); var credfull = { email: "[e-mail]", password: "secret" }, crednopwd = { email: "[e-mail]" }, whereclause = { uid: "blabla" }; console.log( mysql.format( 'UPDATE user SET ? WHERE ?', [credfull, whereclause]) ); // UPDATE user SET `email` = '[e-mail]', `password` = 'secret' WHERE `uid` = 'blabla' console.log( mysql.format( 'UPDATE user SET ? WHERE ?', [crednopwd, whereclause]) ); // UPDATE user SET `email` = '[e-mail]' WHERE `uid` = 'blabla' 

希望这可以帮助。