linux c mysql 开发

http://blog.csdn.net/hyhyl1990/article/details/7958263

二、安装mysql开发包

sudo apt-get install libmysqlclient-dev

Ubuntu Package查询地址（输入关键词查询到最新的package名字，比如libmysqlclient，然后装最新的版本）：

http://packages.ubuntu.com/

三、如何调用MYSQL库文件

加入头文件： #include <mysql/mysql.h>

#include <mysql/mysql.h>

#include "stdio.h"

int main()

{

printf("i love c\n");

return 0;

}

保存为test.c

四、编译方法

gcc -o test test.c -lmysqlclient

或（c++程序）

g++ -o test test.cpp -lmysqlclient

还是找不到mysql.h?添加参数-I/usr/include/mysql/看看（示例如下），假设mysql.h在该目录下。

gcc -o test test.c -lmysqlclient -I/usr/include/mysql/

执行：

./test

例子

MYSQL DbObj; //handle

MYSQL_RES *pRes; //result

MYSQL_ROW sqlrow; //row

int main()

{

char strsql[200];

char username[20];

char password[20];

sprintf(username,"root");

sprintf(password,"123456");

mysql_init(&DbObj);

if(!mysql_real_connect(&DbObj,"192.168.75.131",username,password,"test",0,NULL,0) )

{

return 0;

}

sprintf(strsql,"select * from person");

int res=mysql_query(&DbObj,strsql);

pRes=mysql_use_result(&DbObj);

if( (sqlrow=mysql_fetch_row(pRes))!=NULL )

{

mysql_free_result(pRes);//释放记录集

printf("Ok.\n");

}

mysql_close(&DbObj);

}

再次改进，读字段名和记录

#include <mysql/mysql.h>

#include "stdio.h"

#include <string.h>

MYSQL DbObj; //handle

MYSQL_RES *pRes; //result

MYSQL_ROW sqlrow; //row

void display_row();

void display_head();

int main()

{

char strsql[200];

char username[20];

char password[20];

int first_row=1;

sprintf(username,"root");

sprintf(password,"123456");

mysql_init(&DbObj);

if(!mysql_real_connect(&DbObj,"192.168.75.131",username,password,"test",0,NULL,0) )

{

return 0;

}

sprintf(strsql,"select * from person");

int res=mysql_query(&DbObj,strsql);

if(res)

{

fprintf(stderr,"select error: %s\n",mysql_error(&DbObj) );

}

else

{

pRes=mysql_use_result(&DbObj);

if(pRes)

{

while( (sqlrow=mysql_fetch_row(pRes))!=NULL )

{

if(first_row)

{

display_head();

first_row=0;

}

display_row();

}

}

}

mysql_close(&DbObj);

}

/*

读字段名

*/

void display_head()

{

MYSQL_FIELD *field_ptr;

printf("column details:\n");

while( (field_ptr=mysql_fetch_field(pRes))!=NULL )

{

printf("Name:%s\t\n",field_ptr->name);

printf("Type:\t" );

if(IS_NUM(field_ptr->type))

{

printf("Numeric filed\n");

}

else

{

switch(field_ptr->type)

{

case FIELD_TYPE_VAR_STRING:

printf("varchar \n");

break;

case FIELD_TYPE_LONG:

printf("Long \n");

break;

default:

printf("Type is %d,check in mysql_com.h\n",field_ptr->type);

}

}

}

}

/*

读行记录

*/

void display_row()

{

unsigned int field_count;

field_count = 0;

while(field_count<mysql_field_count(&DbObj))

{

if(sqlrow[field_count]) printf("%s ",sqlrow[field_count]);

else printf("NULL");

field_count++;

}

printf("\n");

}

继续改进，加上事务，加上执行insert ,update

#include <mysql/mysql.h>

#include "stdio.h"

#include <string.h>

MYSQL DbObj; //handle

MYSQL_RES *pRes; //result

MYSQL_ROW sqlrow; //row

void display_row();

void display_head();

int main()

{

char strsql[200];

char insrtsql[200];

char username[20];

char password[20];

int first_row=1;

int t=-1;

sprintf(username,"root");

sprintf(password,"lovepxm");

mysql_init(&DbObj);

if(!mysql_real_connect(&DbObj,"192.168.75.131",username,password,"test",0,NULL,0) )

{

fprintf(stderr,"无法连接到数据库，错误原因是:%s/n",mysql_error(&DbObj));

return 0;

}

sprintf(insrtsql,"%s","insert into person (person_name) Values ('xx')");

mysql_query(&DbObj,insrtsql);

t=mysql_real_query(&DbObj,"SET AUTOCOMMIT =0",(unsigned int)strlen("SET AUTOCOMMIT =0"));

if(t){

printf("启用手工事务失败\n");

}else{

printf("启用手工事务成功\n");

}

t=mysql_real_query(&DbObj,"Begin ;",(unsigned int)strlen("Begin ;")); //开启事务

sprintf(insrtsql,"%s","insert into person (person_name) Values ('yyyy')");

int inset_1=mysql_query(&DbObj,insrtsql);

sprintf(insrtsql,"%s","insert into person (person_name) Values ('ok')");

int inset_2=mysql_query(&DbObj,insrtsql);

if(inset_1==0 && inset_2==0 ){ //结束事务

printf("事务提交\n");

t=mysql_real_query(&DbObj,"COMMIT;",(unsigned int)strlen("COMMIT;"));

}else{

printf("事务回滚\n");

t=mysql_real_query(&DbObj,"ROLLBACK;",(unsigned int)strlen("ROLLBACK;"));

}

sprintf(strsql,"select * from person");

int res=mysql_query(&DbObj,strsql);

if(res)

{

fprintf(stderr,"select error: %s\n",mysql_error(&DbObj) );

}

else

{

pRes=mysql_use_result(&DbObj);

if(pRes)

{

while( (sqlrow=mysql_fetch_row(pRes))!=NULL )

{

if(first_row)

{

display_head();

first_row=0;

}

display_row();

}

}

}

mysql_close(&DbObj);

}

/*

读字段名

*/

void display_head()

{

MYSQL_FIELD *field_ptr;

printf("column details:\n");

while( (field_ptr=mysql_fetch_field(pRes))!=NULL )

{

printf("Name:%s\t\n",field_ptr->name);

printf("Type:\t" );

if(IS_NUM(field_ptr->type))

{

printf("Numeric filed\n");

}

else

{

switch(field_ptr->type)

{

case FIELD_TYPE_VAR_STRING:

printf("varchar \n");

break;

case FIELD_TYPE_LONG:

printf("Long \n");

break;

default:

printf("Type is %d,check in mysql_com.h\n",field_ptr->type);

}

}

}

}

/*

读行记录

*/

void display_row()

{

unsigned int field_count;

field_count = 0;

while(field_count<mysql_field_count(&DbObj))

{

if(sqlrow[field_count]) printf("%s ",sqlrow[field_count]);

else printf("NULL");

field_count++;

}

printf("\n");

}
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