如何将多个 GET 参数传递给 Express？

Question

我对 Node.js 有点陌生，并且在 Node.js 中编写了一些 REST API。对于我的一个 API，我需要传递 2 个参数才能从数据库中获取数据。我已经使用单个参数实现了它，但不超过 2 个。有人可以帮我吗？

这是我的代码

app.get('/getData/:receiver_id&:sender_id',function(req,res){
    connection.query('SELECT * FROM mytable WHERE sender_id=? AND receiver_id=?',[req.params.sender_id],[req.params.receiver_id],function(error,results,fields){
        if(error) throw error;
        else {
        res.json({'result':results})
        console.log(JSON.stringify(results))
        }
    });
});

我在控制台中不断收到此错误

> /var/www/html/chatApp/node_modules/mysql/lib/protocol/Parser.js:80
        throw err; // Rethrow non-MySQL errors
              ^
TypeError: Object 1 has no method 'apply'
    at Query.Sequence.end (/var/www/html/chatApp/node_modules/mysql/lib/protocol/sequences/Sequence.js:83:24)
    at Query.ErrorPacket (/var/www/html/chatApp/node_modules/mysql/lib/protocol/sequences/Query.js:90:8)
    at Protocol._parsePacket (/var/www/html/chatApp/node_modules/mysql/lib/protocol/Protocol.js:278:23)
    at Parser.write (/var/www/html/chatApp/node_modules/mysql/lib/protocol/Parser.js:76:12)
    at Protocol.write (/var/www/html/chatApp/node_modules/mysql/lib/protocol/Protocol.js:38:16)
    at Socket.<anonymous> (/var/www/html/chatApp/node_modules/mysql/lib/Connection.js:91:28)
    at Socket.<anonymous> (/var/www/html/chatApp/node_modules/mysql/lib/Connection.js:502:10)
    at Socket.EventEmitter.emit (events.js:95:17)
    at Socket.<anonymous> (_stream_readable.js:710:14)
    at Socket.EventEmitter.emit (events.js:92:17)

Answer 1

您的代码中的路由定义模式很好（检查this thread 以获取替代方案），问题不同：您应该使用单个数组来传递所有查询值（docs），而不是单独的数组对于每个参数。例如：

connection.query(
   'SELECT * FROM mytable WHERE sender_id=? AND receiver_id=?',
   [req.params.sender_id, req.params.receiver_id],
   function(/*...*/)
);

请注意，这里的错误消息实际上很有帮助：Object 1 has no method apply 表示 MySQL 包尝试将您的参数视为函数（回调）。

Answer 2

这样试试 在此fromatlocalhost:portno/getData/:receiver_id/:sender_idEx: localhost:portno/getdata/12/21形成url

app.get('/getData/:receiver_id/:sender_id',function(req,res){
    connection.query('SELECT * FROM mytable WHERE sender_id=? AND receiver_id=?',[req.params.sender_id, req.params.receiver_id],function(error,results,fields){
        if(error) throw error;
        else {
        res.json({'result':results})
        console.log(JSON.stringify(results))
        }
    });
});

其他方式

'Ex: localhost:portno/getdata/12&21`
 app.get('/getData/:receiver_id&:sender_id',function(req,res){
        connection.query('SELECT * FROM mytable WHERE sender_id=? AND receiver_id=?',[req.params.sender_id, req.params.receiver_id],function(error,results,fields){
            if(error) throw error;
            else {
            res.json({'result':results})
            console.log(JSON.stringify(results))
            }
        });
    });

另一种方法

app.get('/getData/:receiver_id&:sender_id',function(req,res){
        connection.query('SELECT * FROM mytable WHERE sender_id=? AND receiver_id=?',req.params.sender_id, req.params.receiver_id,function(error,results,fields){
            if(error) throw error;
            else {
            res.json({'result':results})
            console.log(JSON.stringify(results))
            }
        });
    });

Answer 3

app.get('/getData/:receiver_id/:sender_id',function(req,res){
    connection.query('SELECT * FROM mytable WHERE sender_id=? AND receiver_id=?',[req.params.sender_id, req.params.receiver_id],function(error,results,fields){
        if(error) throw error;
        else {
            res.json({'result':results})
            console.log(JSON.stringify(results))
        }
    });
});