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Node.js method example for connecting to MySQL

小云云
小云云Original
2018-03-02 11:30:441558browse

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:

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