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                            # node操作mysql

## 1.安裝

~~~
npm i mysql
//這里下載的是客戶端
~~~

~~~
- 服務端

- 客戶端
	-node的mysql模塊是客戶端
~~~

~~~
1.連接服務器
2.給服務器發送請求--(查詢)
~~~

## 2.操作數據庫

### 2.1連接數據庫`createConnection`

### 2.2db.query查詢

~~~js
const mysql = require('mysql');
/* 1.
連接 
createConnection(連接哪臺服務器,用戶名,密碼,連接那個庫)
*/
var db = mysql.createConnection({
    host:"localhost",
    //設置的3306這個端口號可以省略,如果是其他端口號必須加上
    // port:3306, 
    user:"root",
    password:"123456",
    database:'cheng2019/3/15'
})
/* 2.查詢
query(干啥,回調)
 */
db.query("SELECT * FROM `user_table`;",(err,data)=>{
    if(err){
        console.log("出錯了")
    }else{
        console.log("成功了",data);
        var result = JSON.stringify(data);
        console.log(result)
    }
});

~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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