linux c mysql

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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

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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http://www.cnblogs.com/co1d7urt/archive/2012/10/23/2735320.html

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