學習mysql安裝和在node.js使用

一，安裝window上mysql

https://www.cnblogs.com/xsmile/p/7753984.html

二，node連線資料庫

首先引入mysql，

var connection = mysql.createConnection({     
  host     : 'localhost',       
  user     : 'root',              
  password : 'fan******',       
  port: '3306',                   
  database: 'runoob' 
}); 
 

資料庫連線

connection.connect();

資料庫斷開

connection.end();

三，建立新的資料庫

mysql通用語法建立一個新的資料庫

CREATE TABLE IF NOT EXISTS `runoob_tbl`(
   `runoob_id` INT UNSIGNED AUTO_INCREMENT,
   `runoob_title` VARCHAR(100) NOT NULL,
   `runoob_author` VARCHAR(40) NOT NULL,
   `submission_date` DATE,
   PRIMARY KEY ( `runoob_id` )
)ENGINE=InnoDB DEFAULT CHARSET=utf8;
 

使用node.js建立trybiao234表的話程式碼如下：

var two = '`trybiao234`'
var  sql = "CREATE TABLE IF NOT EXISTS" + two + "(\
    `runoob_id` INT UNSIGNED AUTO_INCREMENT,\
    `runoob_title` VARCHAR(100) NOT NULL,\
    `runoob_author` VARCHAR(40) NOT NULL,\
    `submission_date` DATE,\
    PRIMARY KEY ( `runoob_id` )\
 )ENGINE=InnoDB DEFAULT CHARSET=utf8;\
"
connection.query(sql,function (err, result) {
        if(err){
          console.log('[DELETE ERROR] - ',err.message);
          return;
        }        
 		console.log(result)
});
 

四，向表中插入一個數據

mysql向資料庫中的表插入一個數據，mysql語法

INSERT INTO table_name ( field1, field2,...fieldN )
         VALUES
         ( value1, value2,...valueN );

node的寫法

var  addSql = 'INSERT INTO websites(Id,name,url,alexa,country) VALUES(0,?,?,?,?)';
var  addSqlParams = ['菜鳥工具', '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 ID:',result);        
      
});

五，刪除表中一個數據

node的寫法

var delSql = 'DELETE FROM websites where id=?;
//刪
var dId = [6]
connection.query(delSql, dId, 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');  
});

六，更新資料

node寫法

var modSql = 'UPDATE websites SET name = ?,url = ? WHERE Id = ?';
var modSqlParams = ['菜鳥移動站', '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 affectedRows',result);

});

七，查詢資料

node寫法

var  sql = 'SELECT * FROM websites';
//查
connection.query(sql,function (err, result) {
        if(err){
          console.log('[SELECT ERROR] - ',err.message);
          return;
        }
       console.log(result);

});

查著全部資料

var  sql = 'SELECT * FROM websites WHERE name=?';
var two =['Google']
//查
connection.query(sql,two,function (err, result) {
        if(err){
          console.log('[SELECT ERROR] - ',err.message);
          return;
        }
       console.log(result);
       
});

用WHERE來尋找