Question

Hello Guys我是节点js的新手，我有一个jade framerwork，我有两个html选项，我必须从不同的不同sql获取数据，如果我用一个sql和一个html选项做一切很好，但只要我执行多个SQL它给我类型错误我的js代码是：

    exports.Questions = function (req, res) {
    var con = mysql.createConnection({
    host : 'localhost',
    user : 'root',
    password : '',
    database : 'nodeutility',
    multipleStatements: true
});
//res.render('Subcategory', { title: 'Subcategory', year: new Date().getFullYear(), message: 'Your Subcategory page' });
con.connect();
var sql = 'SELECT * FROM mst_category';
con.query(sql, function (err, rows, fields) {
    if (err) throw err;
    res.render('Questions', { title: 'Users', rows: rows });
    res.end;

});
var sql1 = 'SELECT * FROM mst_subcategory';
con.query(sql1, function (err, rows1, fields) {
    if (err) throw err;
    res.render('Questions', { title: 'Users', rows1: rows1 });
    res.end;

});
 con.end();
 };

我的玉代码是这样的：

            div.form-group
            label(for='name') Select Category:
            select#catname.form-control(name='catname')
                each item in rows
                    option(value=item.id) #{item.Name}
            div.form-group
            label(for='name') Select Sub-Category:
            select#subname.form-control(name='subname')
                each item1 in rows1
                    option(value=item1.id) #{item1.Name}

Answer 1

这可能会有所帮助：

var mysql = require('mysql')

exports.Questions = function (req, res) {

    var connection = mysql.createConnection({
        host : 'localhost',
        user : 'root',
        password : '',
        database : 'nodeutility',
        multipleStatements: true
    });

    connection.connect();

    var sql = 'SELECT * FROM mst_category';
    var sql1 = 'SELECT * FROM mst_subcategory';

    connection.query(sql, function (err, rows, fields) {
        if (err) throw err;
        connection.query(sql1, function (err, rows1, fields) {
            if (err) throw err;
            res.render('Questions', { title: 'Users', rows: rows ,rows1: rows1 });
            res.end;
            connection.end();

        });
    });
 };

Answer 2

你只需要在第一个回调函数中进行第二次查询。

exports.Questions = function(req, res) {
    var con = mysql.createConnection({
        host: 'localhost',
        user: 'root',
        password: '',
        database: 'nodeutility',
        multipleStatements: true
    });

    con.connect();

    var sql = 'SELECT * FROM mst_category';
    con.query(sql, function(err, rows, fields) {

        if (err) throw err;

        var sql1 = 'SELECT * FROM mst_subcategory';
        con.query(sql1, function(err, rows1, fields) {
            if (err) throw err;
            res.render('Questions', { title: 'Users', rows: rows, rows1: rows1 });
        });

        con.end();

    });
};

节点js中的多选查询

2 个答案: