Question

我是NODE的新手。我建立了一个POST API来执行选择查询操作。我编写了一个执行选择查询操作的函数。如果用户存在，我将向调用函数发送1或发送0。基于响应，我试图发送自定义响应。但是我要未定义。

下面是我的api：

router.post('/registeruser',(req, res, next) => {
var username    =    req.body.username;
var email       =    req.body.email;
var password    =    req.body.password;

var checkuser   =    DbHandler.checkUser(username,email);   

 if(checkuser == 0) {
  console.log(checkuser); // i'm getting undefined
     console.log("insert user");
 } else if(checkuser == 1) {
  console.log(checkuser); // i'm getting undefined
    res.status(201).json({
             error   : true,
             message : "User with same credentials exist's"    
    });
 }

}）;

下面是我的功能

         checkUser(username,email) {
     //sql query
     dbConnection.query("SELECT * FROM users WHERE username = '"+username+"' AND email = '"+email+"'",function(error,result,fields){
        if(!!error){
            return error;
     } else {
        console.log(result);
        if(result == null || result.length == 0){
            console.log("inside if");
            return 0;// success response or user deos not exists confirmation
        } else {
            return 1;    
        }
     }//end of else
    });//end of query execution function   
}

如何将自定义返回值从方法发送到NODEJS中的api。？

0 个答案: