2010年1月27日 晚 22：10

作者：longyun(http://www.linuxdiyf.com/mailto:mtd527@gmail.com)

續(xù)：小弟最近想學(xué)習(xí)數(shù)據(jù)庫，并想開發(fā)一個簡單的數(shù)據(jù)庫管理系統(tǒng)，需要用到 GTK+2.0 , C語言 ， Mysql ；所以小弟查看了很多l(xiāng)inux下C操作mysql的資料，發(fā)現(xiàn)寫的都不怎么詳細(xì)，所以小弟寫下這篇短文供大家一起交流學(xué)習(xí)！

實驗環(huán)境：

Fedora 11

組件：

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：

啟動一個mysql客戶端

[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>

創(chuàng)建一個數(shù)據(jù)庫

mysql> create database cusemysql;

Query OK, 1 row affected (0.00 sec)

并使用這個數(shù)據(jù)庫

mysql> use cusemysql;

Database changed

在給數(shù)據(jù)庫內(nèi)創(chuàng)建一個表

mysql> create table children(childno int not null unique,fname varchar(20),age int);

Query OK, 0 rows affected (0.00 sec)

在該表內(nèi)插入一項數(shù)據(jù)

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：

編寫 insert.c

///

/* insert.c */

#include

#include

#include

/*注意哦，上面寫的是mysql.h的絕對地址，一般在/usr/include/mysql下，仔細(xì)看看你的在哪里？這種方式 #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,主機(jī)名,用戶名,密碼,數(shù)據(jù)庫名,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));

/*里頭的函數(shù)返回受表中影響的行數(shù)*/

}

else

{

//分別打印出錯誤代碼及詳細(xì)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;

}

/

代碼寫完了，要編譯哦

[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]#

頭文件和庫文件位置沒有指定

[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還是找不到頭文件，下面我們可以這樣,指定gcc專門找 mysqlclient 之類的庫

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

我用 -lmysqlclient 選項就可以了。

ok,現(xiàn)在我們執(zhí)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中是否多了剛才插入的那一行數(shù)據(jù)

mysql> select * from children;

+---------+-------+------+

| childno | fname | age |

+---------+-------+------+

| 1 | jhon | 10 |

| 11 | Anny | 5 |

+---------+-------+------+

2 rows in set (0.00 sec)

學(xué)習(xí)linux的兄弟們都不容易，歡迎大家交流,Skype:mtd527

(因為linux下的QQ很不穩(wěn)定，功能太少，故留下Skype 帳號)

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