In this article, we mainly introduce how to use Node.js to connect to MySQL and operate the database. The Websites table SQL file used in this tutorial: websites.sql, I hope it can be helpful to everyone.
Installing the driver
This tutorial uses Taobao’s customized cnpm command for installation:
$ cnpm install mysql
Connect to the database
Modify in the following examples according to your actual situation Configure and modify the database user name, password and database name:
test.js file code:
var mysql = require('mysql');
var connection = mysql.createConnection
({ host : 'localhost', user :
'root', password : '123456', database : 'test'});
connection.connect(); connection.query
('SELECT 1 + 1 AS solution', function
(error, results, fields) { if (error)
throw error; console.log
('The solution is: ', results[0]
.solution);}
);Execute the following command and the output will be:
$ node test.js The solution is: 2
数据库连接参数说明:
| 参数 | 描述 |
|---|---|
| host | 主机地址 (默认:localhost) |
| user | 用户名 |
| password | 密码 |
| port | 端口号 (默认:3306) |
| database | 数据库名 |
| charset | 连接字符集(默认:'UTF8_GENERAL_CI',注意字符集的字母都要大写) |
| localAddress | 此IP用于TCP连接(可选) |
| socketPath | 连接到unix域路径,当使用 host 和 port 时会被忽略 |
| timezone | 时区(默认:'local') |
| connectTimeout | Connection timeout (default: no limit; unit: milliseconds) |
| stringifyObjects | Whether to serialize objects |
| typeCast | Whether to convert column values into local JavaScript type values (default: true) |
| queryFormat | Custom query statement formatting method |
| supportBigNumbers | When the database supports bigint or decimal type columns, you need to set this option to true (default: false) |
| bigNumberStrings | supportBigNumbers and bigNumberStrings enable forcing bigint or decimal columns to be returned as JavaScript string types (default: false) |
| dateStrings | Force timestamp, datetime, and data types to be returned as string types instead of JavaScript Date types (default: false) |
| debug | Enable debugging ( Default: false) |
| multipleStatements | Whether to allow multiple MySQL statements in one query (default: false) |
| flags | is used to modify the connection flags |
| ssl | Use the ssl parameter (the same format as the crypto.createCredenitals parameter) or a ssl configuration file name containing The string, currently only bundles the Amazon RDS configuration file |
更多说明可参见:https://github.com/mysqljs/mysql
数据库操作( CURD )
在进行数据库操作前,你需要将本站提供的 Websites 表 SQL 文件websites.sql 导入到你的 MySQL 数据库中。
本教程测试的 MySQL 用户名为 root,密码为 123456,数据库为 test,你需要根据自己配置情况修改。
查询数据
将上面我们提供的 SQL 文件导入数据库后,执行以下代码即可查询出数据:
查询数据
var mysql = require('mysql');
var connection = mysql.createConnection
({ host : 'localhost',
user : 'root',
password : '123456',
port: '3306',
database: 'test', });
connection.connect();
var sql = 'SELECT * FROM websites';
//查connection.query(sql,function (err, result)
{ if(err)
{ console.log('[SELECT ERROR] - ',err.message); return; }
console.log('--------------------------SELECT----------------------------');
console.log(result);
console.log('------------------------------------------------------------\n\n'); });
connection.end();执行以下命令输出就结果为:
$ node test.js--------------------------SELECT----------------------------[ RowDataPacket {
id: 1,
name: 'Google',
url: 'https://www.google.cm/',
alexa: 1,
country: 'USA' },
RowDataPacket {
id: 2,
name: '淘宝',
url: 'https://www.taobao.com/',
alexa: 13,
country: 'CN' },
RowDataPacket {
id: 3,
name: '菜鸟教程',
url: 'http://www.runoob.com/',
alexa: 4689,
country: 'CN' },
RowDataPacket {
id: 4,
name: '微博',
url: 'http://weibo.com/',
alexa: 20,
country: 'CN' },
RowDataPacket {
id: 5,
name: 'Facebook',
url: 'https://www.facebook.com/',
alexa: 3,
country: 'USA' } ]------------------------------------------------------------
插入数据
我们可以向数据表 websties 插入数据:
插入数据
var mysql = require('mysql');
var connection = mysql.createConnection
({ host : 'localhost',
user : 'root',
password : '123456', port: '3306', database: 'test', });
connection.connect(); var addSql = 'INSERT INTO websites(Id,name,url,alexa,country)
VALUES(0,?,?,?,?)';var addSqlParams = ['菜鸟工具', 'https://c.runoob.com','23453', 'CN'];
//增connection.query(addSql,addSqlParams,function (err, result) { if(err)
{ console.log('[INSERT ERROR] - ',err.message); return; }
console.log('--------------------------INSERT----------------------------');
//console.log('INSERT ID:',result.insertId); console.log('INSERT ID:',result);
console.log('-----------------------------------------------------------------\n\n'); });
connection.end();执行以下命令输出就结果为:
$ node test.js--------------------------INSERT----------------------------INSERT ID: OkPacket {
fieldCount: 0,
affectedRows: 1,
insertId: 6,
serverStatus: 2,
warningCount: 0,
message: '',
protocol41: true,
changedRows: 0 }-----------------------------------------------------------------
执行成功后,查看数据表,即可以看到添加的数据:

更新数据
我们也可以对数据库的数据进行修改:
更新数据
var mysql = require('mysql'); var connection = mysql.createConnection({ host : 'localhost', user : 'root', password : '123456', port: '3306', database: 'test', }); connection.connect(); var modSql = 'UPDATE websites SET name = ?,url = ? WHERE Id = ?';var modSqlParams = ['菜鸟移动站', 'https://m.runoob.com',6];//改connection.query(modSql,modSqlParams,function (err, result) { if(err){ console.log('[UPDATE ERROR] - ',err.message); return; } console.log('--------------------------UPDATE----------------------------'); console.log('UPDATE affectedRows',result.affectedRows); console.log('-----------------------------------------------------------------\n\n');}); connection.end();
执行以下命令输出就结果为:
--------------------------UPDATE----------------------------UPDATE affectedRows 1-----------------------------------------------------------------
执行成功后,查看数据表,即可以看到更新的数据:

删除数据
我们可以使用以下代码来删除 id 为 6 的数据:
删除数据
var mysql = require('mysql');
var connection = mysql.createConnection
({ host : 'localhost',
user : 'root', password : '123456',
port: '3306', database: 'test', });
connection.connect(); var delSql = 'DELETE FROM websites where id=6';
//删connection.query(delSql,function (err, result) { if(err)
{ console.log('[DELETE ERROR] - ',err.message);
return; }
console.log('--------------------------DELETE----------------------------');
console.log('DELETE affectedRows',result.affectedRows);
console.log('-----------------------------------------------------------------\n\n'); });
connection.end();执行以下命令输出就结果为:
--------------------------DELETE----------------------------DELETE affectedRows 1-----------------------------------------------------------------
执行成功后,查看数据表,即可以看到 id=6 的数据已被删除:

相关推荐:
PHP 使用 ODBC 连接 Mysql 数据库_PHP教程
node.js 开发指南 – Node.js 连接 MySQL 并进行数据库操作_node.js
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