为了安装速度快一些,可以使用淘宝定制的 cnpm (gzip 压缩支持) 命令行工具代替默认的 npm,之后就可以使用 cnpm 命令来安装模块了![在这里插入图片描述](https://img-blog.csdnimg.cn/20191221224244278.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L215MTUxODY1MDc0NjM=,size_16,color_FFFFFF,t_70)
(一)安装mysql驱动(cnpm install mysql)
(二)在工程下新建一个叫connect的javascript文件
文件编辑如下
var mysql = require('mysql');
var connection = mysql.createConnection({
host : 'localhost',
user : 'root',
password : '123456',//mysql连接密码
database : 'st_system'//数据库名字
});
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);
});
在Webstorm中示例如下:
(三)打开cmd运行connect文件,结果显示如下,数据库连接成功
(四)对数据库操作
(1)查询数据库
var mysql = require('mysql');
var connection = mysql.createConnection({
host : 'localhost',//连接名
user : 'root',//用户名
password : '123456',
port: '3306',
database: 'st_system'//数据库名
});
connection.connect();
var sql = 'SELECT * FROM class_room';//表名
connection.query(sql,function (err, result) {
if(err){
console.log('[SELECT ERROR] - ',err.message);
return;
}
console.log('--------------------------查询结果----------------------------');
console.log(result);
console.log('------------------------------------------------------------\n\n');
});
WebStorm中如图所示:
![在这里插入图片描述](https://img-blog.csdnimg.cn/20191222122656259.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L215MTUxODY1MDc0NjM=,size_16,color_FFFFFF,t_70)
打开cmd运行connect.js,查询结果如下
![在这里插入图片描述](https://img-blog.csdnimg.cn/20191222122858446.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L215MTUxODY1MDc0NjM=,size_16,color_FFFFFF,t_70)
向表中插入数据
var mysql = require('mysql');
var connection = mysql.createConnection({
host : 'localhost',
user : 'root',
password : '123456',
port: '3306',
database: 'st_system'//数据库名
});
connection.connect();
var addSql = 'INSERT INTO student(id,name,sex,room) VALUES(?,?,?,?)';//student是表名
var addSqlParams = ['12', '李明','男', '501'];
connection.query(addSql,addSqlParams,function (err, result) {
if(err){
console.log('[INSERT ERROR] - ',err.message);
return;
}
console.log('--------------------------插入----------------------------');
console.log('INSERT ID:',result);
console.log('-----------------------------------------------------------------\n\n');
});
connection.end();
cmd中运行connect.js文件,结果显示如下
![在这里插入图片描述](https://img-blog.csdnimg.cn/20191222123824622.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L215MTUxODY1MDc0NjM=,size_16,color_FFFFFF,t_70)
添加成功后数据库表中可看到所添加的数据
![在这里插入图片描述](https://img-blog.csdnimg.cn/20191222123925434.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L215MTUxODY1MDc0NjM=,size_16,color_FFFFFF,t_70)
删除表中数据
var mysql = require('mysql');
var connection = mysql.createConnection({
host : 'localhost',
user : 'root',
password : '123456',
port: '3306',
database: 'st_system'
});
connection.connect();
var delSql = 'DELETE FROM class_room where idroom=102';
connection.query(delSql,function (err, result) {
if(err){
console.log('[DELETE ERROR] - ',err.message);
return;
}
console.log('--------------------------删除----------------------------');
console.log('DELETE affectedRows',result.affectedRows);
console.log('-----------------------------------------------------------------\n\n');
});
connection.end();
cmd中显示如下
![在这里插入图片描述](https://img-blog.csdnimg.cn/20191222124504963.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L215MTUxODY1MDc0NjM=,size_16,color_FFFFFF,t_70)
数据库删除前
![在这里插入图片描述](https://img-blog.csdnimg.cn/20191222124520377.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L215MTUxODY1MDc0NjM=,size_16,color_FFFFFF,t_70)
数据库删除后
![在这里插入图片描述](https://img-blog.csdnimg.cn/20191222124728872.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L215MTUxODY1MDc0NjM=,size_16,color_FFFFFF,t_70)
更改表中数据
var mysql = require('mysql');
var connection = mysql.createConnection({
host : 'localhost',
user : 'root',
password : '123456',
port: '3306',
database: 'st_system'
});
connection.connect();
var modSql = 'UPDATE student SET name =?WHERE Id = ?';//注意?和 //WHERE之间不能有逗号
var modSqlParams = ['王芳', '23'];
connection.query(modSql,modSqlParams,function (err, result) {
if(err){
console.log('[UPDATE ERROR] - ',err.message);
return;
}
console.log('--------------------------更改----------------------------');
console.log('UPDATE affectedRows',result.affectedRows);
console.log('-----------------------------------------------------------------\n\n');
});
connection.end();
![在这里插入图片描述](https://img-blog.csdnimg.cn/20191222125826159.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L215MTUxODY1MDc0NjM=,size_16,color_FFFFFF,t_70)
更改后的数据库
![在这里插入图片描述](https://img-blog.csdnimg.cn/2019122213005563.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L215MTUxODY1MDc0NjM=,size_16,color_FFFFFF,t_70)
以上完成了对数据库的增删改查操作,当然增删改操作可以在同一个文件中同时完成。