linux c mysql

转载自：http://blog.csdn.net/pdw2009/article/details/22224825

红色标记为自己修改部分

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。

（另外参考http://bbs.csdn.net/topics/390406501解决方案，我是这样解决的）

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

执行：

./test

例子

自我感觉：例子封装不好，做成数据库封装：例如传递 MYSQL ROW等 做为函数参数，并且传递指针

具体封装内容待定！！

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
使用的前提是创建表的时候TYPE＝INNODB

#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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