学习mysql安装和在node.js使用

学习mysql安装和在node.js使用

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一，安装window上mysql

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

二，node连接数据库

首先引入mysql，

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

数据库连接

connection.connect();

数据库断开

connection.end();

三，创建新的数据库

mysql通用语法创建一个新的数据库

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创建trybiao234表的话代码如下：

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，向表中插入一个数据

mysql向数据库中的表插入一个数据，mysql语法

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

node的写法

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 ID:',result);        
      
});

五，删除表中一个数据

node的写法

var delSql = 'DELETE FROM websites where id=?;
//删
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，更新数据

node写法

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 affectedRows',result);

});

七，查找数据

node写法

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

});

查着全部数据

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来寻找