节点错误“无法读取未定义的属性'insertId'”

Question

我是node的新手，我下载了一个注册示例，它显示错误：

“无法读取未定义的属性'insertId'”

passport.serializeUser(function(user, done) {
    done(null, user.id);
});


passport.deserializeUser(function(id, done) {
    connection.query("SELECT * FROM singup WHERE id = ? ",[id], function(err, rows){
        done(err, rows[0]);
    });
});


passport.use(
    'local-signup',
    new LocalStrategy({

        fullnameField : 'fullname',
        usernameField : 'username',
        passwordField : 'password',
        passReqToCallback : true 
    },
    function(req,fullname, username, password, done) {

        connection.query("SELECT * FROM singup WHERE username = ?",[username], function(err, rows) {
            if (err)
                return done(err);
            if (rows.length) {
                return done(null, false, req.flash('signupMessage', 'That username is already taken.'));
            } 
            else {

                var newUserMysql = {
                    id:"2",
                    fullname: fullname,
                    username: username,
                    password: bcrypt.hashSync(password, null, null)  
                };

                var insertQuery = "INSERT INTO singup (fullname, username, password ) values (?,?,?)";

                connection.query(insertQuery,[newUserMysql.fullname, newUserMysql.username, newUserMysql.password],function(err, rows) {

                    newUserMysql.id = rows.insertId;
                    return done(null, newUserMysql);
                });
            }
        });
    })
);

 //TypeError: Cannot read property 'insertId' of undefined
    at Query.<anonymous> (E:\testing\nodejs\config\passport.js:71:48)
    at Query.<anonymous> (E:\testing\nodejs\node_modules\mysql\lib\Connection.js:502:10)
    at Query._callback (E:\testing\nodejs\node_modules\mysql\lib\Connection.js:468:16)
    at Query.Sequence.end (E:\testing\nodejs\node_modules\mysql\lib\protocol\sequences\Sequence.js:83:24)
    at Query.ErrorPacket (E:\testing\nodejs\node_modules\mysql\lib\protocol\sequences\Query.js:90:8)
    at Protocol._parsePacket (E:\testing\nodejs\node_modules\mysql\lib\protocol\Protocol.js:278:23)
    at Parser.write (E:\testing\nodejs\node_modules\mysql\lib\protocol\Parser.js:76:12)
    at Protocol.write (E:\testing\nodejs\node_modules\mysql\lib\protocol\Protocol.js:38:16)
    at Socket.<anonymous> (E:\testing\nodejs\node_modules\mysql\lib\Connection.js:91:28)
    at Socket.<anonymous> (E:\testing\nodejs\node_modules\mysql\lib\Connection.js:502:10)

Answer 1

首先，请务必检查错误！ 如果有错误，则行字段将是未定义的。 （ 似乎是这种情况 ）

如果没有错误，则记录行字段以查看其结构。

行字段可能是一个数组，因此为了访问insertId，您可以尝试更改

从

newUserMysql.id = rows.insertId

至

newUserMysql.id = rows[0].insertId