javascript - 使用 LAST_INSERT_ID 时出现 ER_NO_REFERENCED_ROW_2

Question

我是vuejs和express的新手，我一直想知道如何从Guest表中获取GuestID到外键GuestID code> 在我的预订 表中。

app.post('/create',(req,res,next)=>{
    var mysql = require('mysql')
    var connection = mysql.createConnection(config)
    var sql = "INSERT INTO `guest` SET ?"
    connection.query(sql,req.body,(err,results,fields)=>{
        connection.end()
        if(err){
            next(err)
        }else{
            res.json([true,results.insertId])
        }
    })
})


app.post('/book',(req,res,next)=>{
    var mysql = require('mysql')
    var connection = mysql.createConnection(config)
    var sql = "INSERT INTO `reservation` SET `GuestID`=LAST_INSERT_ID(),`RoomID`=?,`AdultCount`=?,`KidCount`=?,`CheckInDate`=?,`CheckOutDate`=?"
    var RoomID = req.body.RoomID;
    var AdultCount = req.body.AdultCount;
    var KidCount = req.body.KidCount;
    var CheckInDate = req.body.CheckInDate;
    var CheckOutDate = req.body.CheckOutDate;
    connection.query(sql,[RoomID,AdultCount,KidCount,CheckInDate,CheckOutDate],(err,results,fields)=>{
        connection.end()
        if(err){
            next(err)
        }else{
            res.json([true,results])
        }
    })
})

然后我收到此错误:

Error: ER_NO_REFERENCED_ROW_2: Cannot add or update a child row: a foreign key constraint fails (booking.reservation, CONSTRAINT reservation_ibfk_1 FOREIGN KEY (GuestID) REFERENCES guest (GuestID))

Answer 1

感谢@Akina，我尝试在一个连接上搜索查询。我看到一篇文章，您可以使用连接中的 multipleStatements 将多个语句放入 Express 中，并使我的代码如下所示:

app.post('/book',(req,res,next)=>{
    var mysql = require('mysql')
    var connection = mysql.createConnection(config)
    var sql = "INSERT INTO `guest` SET `FirstName`=?,`LastName`=?,`Email`=?,`ContactNumber`=?;SET @GuestID:=LAST_INSERT_ID();INSERT INTO `reservation` SET `GuestID`=@GuestID,`RoomID`=?,`AdultCount`=?,`KidCount`=?,`CheckInDate`=?,`CheckOutDate`=?"
    var FirstName = req.body.FirstName;
    var LastName = req.body.LastName;
    var Email = req.body.Email;
    var ContactNumber = req.body.ContactNumber;
    var RoomID = req.body.RoomID;
    var AdultCount = req.body.AdultCount;
    var KidCount = req.body.KidCount;
    var CheckInDate = req.body.CheckInDate;
    var CheckOutDate = req.body.CheckOutDate;
    connection.query(sql,[FirstName,LastName,Email,ContactNumber,RoomID,AdultCount,KidCount,CheckInDate,CheckOutDate],(err,results,fields)=>{
        connection.end()
        if(err){
            next(err)
        }else{
            res.json([true,results])
        }
    })
})

我的意思是它很长，但它有效，哈哈，但是如果你们有比这更有效的东西，请告诉我