mysql与php

mysql基础部分：

1.配置环境：

找到wamp\bin\mysql\bin，即含有mysql.exe的文件夹，复制路径到PATH

2.命令提示符执行mysql -h localhost -uroot -p  

-h后面是主机名 -p后面应该是密码  如果不以root登陆看不到有些信息

3.查看数据库的用户表：

select * from mysql.user;但是这么写看不出来什么 应该执行 select * from mysql.user\G

4.创建各种==

mysql> create database xsphp;
Query OK, 1 row affected (0.00 sec)

mysql> show databases
    -> ;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| test               |
| xsphp              |
+--------------------+
5 rows in set (0.05 sec)

mysql> use xsphp;
Database changed
mysql> show tables;
Empty set (0.00 sec)

mysql> create table users(
    -> id int not null auto_increment primary key.
    -> usename char(30) not null default '',
    -> password varchar(32) not null default '',
    -> age int not null default 0,
    -> sex char(4) not null default '',
    -> email varchar(80) not null default '');
ERROR 1064 (42000): Erreur de syntaxe près de '.
usename char(30) not null default '',
password varchar(32) not null default ''' à la ligne 2
mysql> create table users(
    -> id int not null auto_increment primary key,
    -> username char(30) not null default '',
    -> password varchar(32) not null default '',
    -> age int not null default 0,
    -> sex char(4) not null default '',
    -> email varchar(80) not null default '');
Query OK, 0 rows affected (0.35 sec)

5.查看各种

mysql> show tables;
+-----------------+
| Tables_in_xsphp |
+-----------------+
| users           |
+-----------------+
1 row in set (0.00 sec)

mysql> desc users;
+----------+-------------+------+-----+---------+----------------+
| Field    | Type        | Null | Key | Default | Extra          |
+----------+-------------+------+-----+---------+----------------+
| id       | int(11)     | NO   | PRI | NULL    | auto_increment |
| username | char(30)    | NO   |     |         |                |
| password | varchar(32) | NO   |     |         |                |
| age      | int(11)     | NO   |     | 0       |                |
| sex      | char(4)     | NO   |     |         |                |
| email    | varchar(80) | NO   |     |         |                |
+----------+-------------+------+-----+---------+----------------+
6 rows in set (0.00 sec)

mysql> show create table users;
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                                                                                                                                                                                                              |
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| users | CREATE TABLE `users` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` char(30) NOT NULL DEFAULT '',
  `password` varchar(32) NOT NULL DEFAULT '',
  `age` int(11) NOT NULL DEFAULT '0',
  `sex` char(4) NOT NULL DEFAULT '',
  `email` varchar(80) NOT NULL DEFAULT '',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

6.修改与更新

mysql> insert into users(username,password,age,sex,email)
    -> values('MissZhou','zyj19950307',20,'female','[email protected]');
Query OK, 1 row affected, 1 warning (0.05 sec)

mysql> insert into users(username,password,age,sex,email)
    ->  values('admin','admin',20,'female','[email protected]');
Query OK, 1 row affected, 1 warning (0.04 sec)

mysql> update users set username='zyj' where id=2;
Query OK, 1 row affected (0.08 sec)
Enregistrements correspondants: 1  Modifi茅s: 1  Warnings: 0

mysql> select * from users;
+----+----------+-------------+-----+------+---------------------------+
| id | username | password    | age | sex  | email                     |
+----+----------+-------------+-----+------+---------------------------+
|  1 | MissZhou | zyj19950307 |  20 | fema | [email protected] |
|  2 | zyj      | admin       |  20 | fema | [email protected] |
+----+----------+-------------+-----+------+---------------------------+
2 rows in set (0.00 sec)

7.删除

mysql> select * from users;
+----+----------+-------------+-----+------+---------------------------+
| id | username | password    | age | sex  | email                     |
+----+----------+-------------+-----+------+---------------------------+
|  1 | MissZhou | zyj19950307 |  20 | fema | [email protected] |
|  2 | zyj      | admin       |  20 | fema | [email protected] |
+----+----------+-------------+-----+------+---------------------------+
2 rows in set (0.00 sec)

mysql> delete from users where id=2;//没有*  !!
Query OK, 1 row affected (0.05 sec)

mysql> select * from users;
+----+----------+-------------+-----+------+---------------------------+
| id | username | password    | age | sex  | email                     |
+----+----------+-------------+-----+------+---------------------------+
|  1 | MissZhou | zyj19950307 |  20 | fema | [email protected] |
+----+----------+-------------+-----+------+---------------------------+
1 row in set (0.00 sec)

mysql> drop users;
ERROR 1064 (42000): Erreur de syntaxe près de 'users' à la ligne 1
mysql> drop table users;
Query OK, 0 rows affected (0.22 sec)

mysql> show table;
ERROR 1064 (42000): Erreur de syntaxe près de '' à la ligne 1
mysql> show tables;
Empty set (0.00 sec)

mysql> drop database xsphp;
Query OK, 0 rows affected (0.08 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| test               |
+--------------------+

这些玩意讲了一年==课件15分钟搞定的==

phpmyadmin的使用

刚刚出现了一个特别惊悚的事情，我在phpmyadmin首页依据视频上的讲解删掉了原有的用户，只保留了主机是localhost的用户，并且修改了密码，再次刷新并没有让我输入密码，又修改了一遍，这下坏了，网页显示phpmyadmin不允许访问mysql说我密码错了QAQ，上网查了，原来还要修改配置文件，C:\wamp\apps\phpmyadmin4.1.14下的config.inc.php密码改成你想要的就好啦

界面简直赞啊，居然给程序员用的还有这么脑残的==啥啥都不用会，相加啥加啥==

PHP访问MySQL

查看mysql的服务是否开启==

合着linux的指令和linux都差不多啊==用之前的指令也是向上箭头（我是不是知道的太多了==

或者在服务进程中找是否有 都可以==

php也是像c#一样，支持好多类型的数据库，语法稍有差异，但都是基于sql写的，反正语言都是触类旁通的，但是多久能通是个人问题==那有没有一套能支持所有数据库的----数据库抽象层！PDO！！！

mysql是面向过程的一套函数mysqli和pdo是面向对象的。

操作mysql

Deprecated: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in C:\wamp\www\database\test1.php on line 3

神啊==我就不该学mysql吗==不学了，反正以后用不着，官方都说淘汰了