1 安装mysql数据库和C/C++ API
　　#sudo apt-get install mysql-server mysql-client libmysql++-dev
2 将lib文件拷到公用文件夹
　　#sudo cp -R /usr/lib/mysql/* /usr/lib/

3 mysql指令键入：

      #mysql -u root -p

按提示输入密码后进入mysql指令键入状态，如：mysql>

4 创建数据库

      mysql>CREATE DATABASE URL

      mysql>use URL

5 创建数据表

     mysql>CREATE TABLE url_list(id INTEGER AUTO_INCREMENT NOT NULL PRIMARY KEY, url varchar(128));

6 相关操作   

mysql> insert into url_list (url) values ( '10.16.1.186:8080');
Query OK, 1 row affected (0.22 sec)

mysql> SELECT id, url FROM url_list;
+----+------------------+
| id | url              |
+----+------------------+
|  1 | 10.16.1.186:8080 |
+----+------------------+
1 row in set (0.00 sec)

mysql>  delete from url_list where url='10.16.1.186:8080';
Query OK, 1 row affected (0.06 sec)

mysql> SELECT id, url FROM url_list;
Empty set (0.00 sec)

mysql>

7 删除表
mysql>drop TABLE url_list;

8 检索表中多次出现的记录

mysql> SELECT id, url FROM url_list;                      
+----+-------------+
| id | url         |
+----+-------------+
|  1 | 10.16.1.186 |
|  2 | 10.16.1.186 |
|  3 | 10.16.1.187 |
|  4 | 10.16.1.187 |
|  5 | 10.16.1.188 |
|  6 | 10.16.1.189 |
+----+-------------+
6 rows in set (0.00 sec)


mysql> select * from url_list where (url_list.url) in (select url from url_list group by url having count(url) > 1);
+----+-------------+
| id | url         |
+----+-------------+
|  1 | 10.16.1.186 |
|  2 | 10.16.1.186 |
|  3 | 10.16.1.187 |
|  4 | 10.16.1.187 |
+----+-------------+
4 rows in set (0.00 sec)

9，插入多个字段的记录

insert into url_list (url, port) values ( '10.16.1.189', '8084'); 

10，查找一个字段重复出现另一字段不重复

mysql> select * from url_list;
+----+-------------+------+
| id | url         | port |
+----+-------------+------+
|  1 | 10.16.1.186 | 8080 |
|  2 | 10.16.1.186 | 8081 |
|  3 | 10.16.1.187 | 8082 |
|  4 | 10.16.1.187 | 8082 |
|  5 | 10.16.1.188 | 8083 |
|  6 | 10.16.1.189 | 8084 |
|  7 | 10.16.1.187 | 8085 |
+----+-------------+------+
7 rows in set (0.00 sec)


mysql> select * from url_list where (url_list.url) in (select url from url_list group by url having count(distinct port) > 1);
+----+-------------+------+
| id | url         | port |
+----+-------------+------+
|  1 | 10.16.1.186 | 8080 |
|  2 | 10.16.1.186 | 8081 |
|  3 | 10.16.1.187 | 8082 |
|  4 | 10.16.1.187 | 8082 |
|  7 | 10.16.1.187 | 8085 |
+----+-------------+------+
5 rows in set (0.00 sec)


mysql> select * from url_list where (url_list.url) in (select url from url_list group by url having count(distinct port) > 1) group by url, port;
+----+-------------+------+
| id | url         | port |
+----+-------------+------+
|  1 | 10.16.1.186 | 8080 |
|  2 | 10.16.1.186 | 8081 |
|  3 | 10.16.1.187 | 8082 |
|  7 | 10.16.1.187 | 8085 |
+----+-------------+------+
4 rows in set (0.00 sec)

贻笑大方了。。。。。。

二、新建表时判断表是否已经存在

from: http://blog.sina.com.cn/s/blog_5e2613830100bvsw.html