小编s0c*_*kan的帖子

是否可以在 sql 查询中使用 javascript 数组？

我想在第二个查询中使用 StudentsId 作为参数。

db.query('SELECT users.* FROM users JOIN classes ON users.class_id=classes.id WHERE classes.id ="' + req.body.classSelect + '" ', function (err, rows) {

    // Saves all my users id that i get from my first query
    var studentsId = [];
    for (var i = 0; i < rows.length; i++) {
        studentsId.push(rows[i].id);
    }
    console.log(studentsId);

    // in this query i want to use studentsId
    db.query("SELECT users.id, users.first_name, users.last_name,attendances.type_id,attendances.attendance_timestamp FROM users JOIN attendances ON attendances.user_id = users.id WHERE …