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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
Modify in the following examples according to your actual situation Configure and modify the database user name, password and database name:
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
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
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。
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:
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' } ]------------------------------------------------------------
我们可以向数据表 websties 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:
我们也可以对数据库的数据进行修改:
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:
我们可以使用以下代码来删除 id 为 6 的数据:
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:
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