PHP mysql基本语句指令

1 /* 选择数据库 2 use test; 3 */ 4 5 /* 显示所有的数据库 6 show databases; 7 */ 8 9 /* 删除表/数据库 10 drop database test1; 11 delete from user1 where id=4; 12 */ 13 14 /* 创建表 15 CREATE TABLE user1( 16 id int primary key auto_increment

<span> 1</span> <span>/*</span><span>选择数据库
</span><span> 2</span> <span>   use test;
</span><span> 3</span>    <span>*/</span>
<span> 4</span>    
<span> 5</span>    <span>/*</span><span> 显示所有的数据库
</span><span> 6</span> <span>   show databases;
</span><span> 7</span>    <span>*/</span>
<span> 8</span>    
<span> 9</span>    <span>/*</span><span>删除表/数据库
</span><span>10</span> <span>   drop database test1;
</span><span>11</span> <span>   delete from user1 where id=4;
</span><span>12</span>    <span>*/</span>
<span>13</span>    
<span>14</span>    <span>/*</span><span>创建表
</span><span>15</span> <span>   CREATE TABLE user1(
</span><span>16</span> <span>id int primary key auto_increment,
</span><span>17</span> <span>name varchar(32) not null,
</span><span>18</span> <span>password varchar(64) not null,
</span><span>19</span> <span>email varchar(128) not null,
</span><span>20</span> <span>age tinyint unsigned not null);</span><span>*/</span>
<span>21</span> 
<span>22</span>   <span>/*</span><span>插入数据
</span><span>23</span> <span>  insert into user1(name,password,email,age)
</span><span>24</span> <span>  values('daomul',md5('daomul'),'975052664@qq.com','22');
</span><span>25</span>   <span>*/</span>
<span>26</span>   
<span>27</span>   <span>/*</span><span>查询数据
</span><span>28</span> <span>  select * from user1;
</span><span>29</span>   <span>*/</span>
<span>30</span>   
<span>31</span>   <span>/*</span><span>输入中文的问题解决
</span><span>32</span> <span>  set character_set_client-gbk;
</span><span>33</span> <span>  set character_set_result-gbk;
</span><span>34</span>   
<span>35</span> <span>  #显示所有字符类型 ：show variables like '%char%';
</span><span>36</span>   
<span>37</span>   <span>*/</span>

 

1、查询一行数据

   "select name from user1 where age=' " .$age. " '  limit 0,1;"  //控制在0-1条数据

2、模糊查询

   "select name from user1 where email like ' % " $email " %' "; 

3、批量执行 sql语句

   3.1  批量执行dml语句

        (1  $sql="$sql1;$sql; ....";  

            或者 ：$sqls="" ;   $sqls.="";   $sqls.=""; ....

       (2   mysqli::multi_query($sqls); //执行操作，并返回 操作的数目。

   3.2  批量执行dml语句

   具体事例：见  http://www.cnblogs.com/daomul/p/3381782.html

 4、自我复制：测试高度的数据

  insert into emp(name,grade,email,school,salary,remark)select name,grade,email,school,salary,remark from emp;