在Linux下通过C语言操作MySQL数据库---实例1-红联Linux系统门户

在Linux下通过C语言操作MySQL数据库
2010年1月27日晚 22：10

作者：longyun(mtd527@gmail.com)

续：小弟最近想学习数据库，并想开发一个简单的数据库管理系统，需要用到 GTK+2.0 , C语言， Mysql ；所以小弟查看了很多linux下C操作mysql的资料，发现写的都不怎么详细，所以小弟写下这篇短文供大家一起交流学习！

实验环境：
Fedora 11

组件：
libdbi-dbd-mysql-0.8.3-4.fc11.i586
mysql-5.1.42-2.fc11.i586
mysql-libs-5.1.42-2.fc11.i586
mysql-devel-5.1.42-2.fc11.i586
mysql-connector-java-5.1.8-2.fc11.i586
qt-mysql-4.5.3-9.fc11.i586
php-mysql-5.2.11-2.fc11.i586
mysql-connector-odbc-5.1.5r1144-4.fc11.i586
mysql-server-5.1.42-2.fc11.i586

第一步：

启动一个mysql客户端
[mtd@mutiandong mysql]$ mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 20
Server version: 5.1.42 Source distribution

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

创建一个数据库
mysql> create database cusemysql;
Query OK, 1 row affected (0.00 sec)

并使用这个数据库
mysql> use cusemysql;
Database changed
在给数据库内创建一个表
mysql> create table children(childno int not null unique,fname varchar(20),age int);
Query OK, 0 rows affected (0.00 sec)

在该表内插入一项数据
mysql> insert into children values(5,‘jhon’,10);
Query OK, 1 row affected (0.00 sec)

mysql> select * from children;
+---------+-------+------+
| childno | fname | age |
+---------+-------+------+
| 1 | jhon | 10 |
+---------+-------+------+
1 row in set (0.00 sec)

mysql>

第二部：

编写 insert.c

///////////////////////////////////
/* insert.c */
#include
#include
#include
/*注意哦，上面写的是mysql.h的绝对地址，一般在/usr/include/mysql下，仔细看看你的在哪里？这种方式 #include "mysql/h" 可能也可以*/

int main(int argc, char *argv[])
{
MYSQL my_connection;

int res;

mysql_init(&my_connection);

/*mysql_real_connect(&mysql,主机名,用户名,密码,数据库名,0,NULL,0) == NULL)*/
/*mysql_real_connect(&mysql,host,user,passwd,dbname,0,NULL,0) == NULL)*/
if (mysql_real_connect(&my_connection, "localhost", "root", "","cusemysql",0,NULL,CLIENT_FOUND_ROWS))
{
printf("Connection success\n");
res = mysql_query(&my_connection, "insert into children values(11,'Anny',5)");

if (!res)
{
printf("Inserted %lu rows\n",(unsigned long)mysql_affected_rows(&my_connection));
/*里头的函数返回受表中影响的行数*/
}
else
{
//分别打印出错误代码及详细信息
fprintf(stderr, "Insert error %d: %s\n",mysql_errno(&my_connection),mysql_error(&my_connection));
}
mysql_close(&my_connection);
}

else
{
fprintf(stderr, "Connection failed\n");

if (mysql_errno(&my_connection))
{
fprintf(stderr, "Connection error %d: %s\n",mysql_errno(&my_connection),mysql_error(&my_connection));
}
}
return EXIT_SUCCESS;
}
/////////////////////////////////////////////
代码写完了，要编译哦
[mtd@mutiandong mysql]# gcc -o insert insert.c
/tmp/ccyHfsX2.o(.text+0x1e): In function `main':
: undefined reference to `mysql_init'
/tmp/ccyHfsX2.o(.text+0x47): In function `main':
: undefined reference to `mysql_real_connect'
/tmp/ccyHfsX2.o(.text+0x76): In function `main':
: undefined reference to `mysql_query'
/tmp/ccyHfsX2.o(.text+0x9a): In function `main':
: undefined reference to `mysql_affected_rows'
/tmp/ccyHfsX2.o(.text+0xbc): In function `main':
: undefined reference to `mysql_error'
/tmp/ccyHfsX2.o(.text+0xcf): In function `main':
: undefined reference to `mysql_errno'
/tmp/ccyHfsX2.o(.text+0xf5): In function `main':
: undefined reference to `mysql_close'
/tmp/ccyHfsX2.o(.text+0x11f): In function `main':
: undefined reference to `mysql_errno'
/tmp/ccyHfsX2.o(.text+0x135): In function `main':
: undefined reference to `mysql_error'
/tmp/ccyHfsX2.o(.text+0x148): In function `main':
: undefined reference to `mysql_errno'
collect2: ld returned 1 exit status
[mtd@mutiandong mysql]#
头文件和库文件位置没有指定
[mtd@mutiandong mysql]# gcc -o insert insert.c -I/usr/include/mysql/ -L/usr/lib/mysql/
/tmp/cc4gdmlp.o(.text+0x1e): In function `main':
: undefined reference to `mysql_init'
/tmp/cc4gdmlp.o(.text+0x47): In function `main':
: undefined reference to `mysql_real_connect'
/tmp/cc4gdmlp.o(.text+0x76): In function `main':
: undefined reference to `mysql_query'
/tmp/cc4gdmlp.o(.text+0x9a): In function `main':
: undefined reference to `mysql_affected_rows'
/tmp/cc4gdmlp.o(.text+0xbc): In function `main':
: undefined reference to `mysql_error'
/tmp/cc4gdmlp.o(.text+0xcf): In function `main':
: undefined reference to `mysql_errno'
/tmp/cc4gdmlp.o(.text+0xf5): In function `main':
: undefined reference to `mysql_close'
/tmp/cc4gdmlp.o(.text+0x11f): In function `main':
: undefined reference to `mysql_errno'
/tmp/cc4gdmlp.o(.text+0x135): In function `main':
: undefined reference to `mysql_error'
/tmp/cc4gdmlp.o(.text+0x148): In function `main':
: undefined reference to `mysql_errno'
collect2: ld returned 1 exit status
[mtd@mutiandong mysql]#

gcc还是找不到头文件，下面我们可以这样,指定gcc专门找 mysqlclient 之类的库

[root@localhost testmysql]# gcc -o insert insert.c -lmysqlclient -I/usr/include/mysql/ -L/usrlib/mysql

我用 -lmysqlclient 选项就可以了。

ok,现在我们执行看看
[mtd@mutiandong mysql]# ./insert
Connection Success
Inserted 1 rows

呵呵，真的成功了！
不信到mysql下看看表children中是否多了刚才插入的那一行数据

mysql> select * from children;
+---------+-------+------+
| childno | fname | age |
+---------+-------+------+
| 1 | jhon | 10 |
| 11 | Anny | 5 |
+---------+-------+------+
2 rows in set (0.00 sec)

学习linux的兄弟们都不容易，欢迎大家交流,Skype:mtd527
(因为linux下的QQ很不稳定，功能太少，故留下Skype 帐号)

在Linux下通过C语言操作MySQL数据库---实例1

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