Node.js MySQL Order By 语句
排序记录集
使用 ORDER BY 语句按升序或降序对记录集进行排序。
ORDER BY 关键字默认情况下按升序对记录集进行排序。要按降序对记录集排序，请使用 DESC 关键字。
实例
按名称的字母顺序对记录集排序:
var mysql = require('mysql');
var con = mysql.createConnection({
host: "localhost",
user: "yourusername",
password: "yourpassword",
database: "mydb"
});
con.connect(function(err) {
if (err) throw err;
con.query("SELECT * FROM customers ORDER BY name", function (err, result) {
if (err) throw err;
console.log(result);
});
});
运行实例 »
将上述代码保存在名为 "demo_db_orderby.js" 的文件中，然后运行该文件:
运行 "demo_db_orderby.js"
C:\Users\Your Name>node demo_db_orderby.js
返回结果:
[
{ id: 3, name: 'Amy',
address: 'Apple st 652'},
{ id: 11, name: 'Ben', address: 'Park Lane 38'},
{ id: 7,
name: 'Betty', address: 'Green Grass 1'},
{ id: 13, name: 'Chuck', address:
'Main Road 989'},
{ id: 4, name: 'Hannah', address:
'Mountain 21'},
{ id: 1, name: 'John', address: 'Higheay 71'},
{ id: 5, name: 'Michael', address: 'Valley 345'},
{ id:
2, name: 'Peter', address: 'Lowstreet 4'},
{ id: 8, name: 'Richard',
address: 'Sky st 331'},
{ id: 6, name: 'Sandy', address: 'Ocean blvd 2'},
{ id: 9, name: 'Susan', address: 'One way
98'},
{ id: 10, name: 'Vicky', address: 'Yellow Garden 2'},
{ id: 14, name: 'Viola', address: 'Sideway
1633'},
{ id: 12, name: 'William',
address: 'Central st 954'}
]
ORDER BY DESC
使用 DESC 关键字按降序对记录集进行排序。
实例
按名称的字母顺序对记录集进行反向排序:
var mysql = require('mysql');
var con = mysql.createConnection({
host: "localhost",
user: "yourusername",
password: "yourpassword",
database: "mydb"
});
con.connect(function(err) {
if (err) throw err;
con.query("SELECT * FROM customers ORDER BY name DESC", function (err, result) {
if (err) throw err;
console.log(result);
});
});
运行实例 »
将上述代码保存在名为 "demo_db_orderby_desc.js" 的文件中，然后运行该文件:
运行 "demo_db_orderby_desc.js"
C:\Users\Your Name>node demo_db_orderby_desc.js
返回结果:
[
{ id: 12, name: 'William',
address: 'Central st 954'},
{ id: 14, name: 'Viola', address: 'Sideway
1633'},
{ id: 10, name: 'Vicky', address: 'Yellow Garden 2'},
{ id: 9, name: 'Susan', address: 'One way
98'},
{ id: 6, name: 'Sandy', address: 'Ocean blvd 2'},
{ id: 8, name: 'Richard',
address: 'Sky st 331'},
{ id:
2, name: 'Peter', address: 'Lowstreet 4'},
{ id: 5, name: 'Michael', address: 'Valley 345'},
{ id: 1, name: 'John', address: 'Higheay 71'},
{ id: 4, name: 'Hannah', address:
'Mountain 21'},
{ id: 13, name: 'Chuck', address:
'Main Road 989'},
{ id: 7,
name: 'Betty', address: 'Green Grass 1'},
{ id: 11, name: 'Ben', address: 'Park Lane 38'},
{ id: 3, name: 'Amy',
address: 'Apple st 652'}
]
