mysql c API访问数据库_MySQL

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#include

#include "CMySQL.h"

#include "stdio.h"

#define MYSQL_PORT 3306

void process_result_set(MYSQL mysql, MYSQL_RES *result);

void exit(MYSQL mydata,char *ep);

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

MYSQL mydata;

Database_Param p;

char queryName[600];

MYSQL_RES *result=NULL;

int status =0;

//初始化

strcpy(p.host,"127.0.0.1");

strcpy(p.user,"root");

strcpy(p.password,"root");

strcpy(p.db,"im");

p.port = MYSQL_PORT;

//初始化数据结构

if(mysql_init(&mydata) == NULL)

{

printf("init mysql data stauct fail/n");

system("pause");

return -1;

}

//连接数据库

if(argc == 1)

{

if(NULL == mysql_real_connect(&mydata,p.host,p.user,p.password,

p.db,p.port,NULL,CLIENT_MULTI_STATEMENTS))

{

printf("connect database fail,%s/n",mysql_error(&mydata));

system("pause");

return -1;

}

}

else

{

printf("run parameter error/n");

system("pause");

return -1;

}

//首先设置字符集

strcpy(queryName,"set names gbkd");

if(mysql_query(&mydata,"set names gbk")!=0)

{

exit(mydata,"set names fail");

return -1;

}

//查询数据(支持单个字段和多个字段，输出排版)

strcpy(queryName,"show databases");

if(mysql_query(&mydata,queryName) != 0)

{

exit(mydata,"execute sql syntax fail");

return -1;

}

//取得查询结果

result= mysql_store_result(&mydata);

process_result_set(mydata,result);

//处理多条插入语句，在mysql_real_connect(......)函数里的最后一个参数更改为：CLIENT_MULTI_STATEMENTS

strcpy(queryName,"insert into fangl.admin(username,password) values('fangl1','fangl1'),('fangl2','fangl2'),('fangl3','fangl3');/

insert into fangl.admin(username,password) values('fl1','fl1'),('fl2','fl2'),('fl3','fl3');/

insert into fangl.admin(username,password) values('fal1','fal1'),('fal2','fal2'),('fal3','fal3');/

select * from fangl.admin");

if(mysql_query(&mydata,queryName)!=0)

{

exit(mydata,"insert values fail");

return -1;

}

do {

/* did current statement return data? */

result = mysql_store_result(&mydata);

if (result)

{

/* yes; process rows and free the result set */

process_result_set(mydata, result);

mysql_free_result(result);

}

else /* no result set or error */

{

if (mysql_field_count(&mydata) == 0)

{

printf("%lld rows affected/n",

mysql_affected_rows(&mydata));

}

else /* some error occurred */

{

printf("Could not retrieve result set/n");

break;

}

}

/* more results? -1 = no, >0 = error, 0 = yes (keep looping) */

if ((status = mysql_next_result(&mydata)) > 0)

printf("Could not execute statement/n");

} while (status == 0);

//删除表中的数据

strcpy(queryName,"delete from fangl.admin where username='fl1'");

if(mysql_query(&mydata,queryName) != 0)

{

exit(mydata,"execute sql syntax fail");

return -1;

}

//查询数据(支持单个字段和多个字段，输出排版)

strcpy(queryName,"select * from fangl.admin");

if(mysql_query(&mydata,queryName) != 0)

{

return -1;

}

//取得查询结果

result= mysql_store_result(&mydata);

process_result_set(mydata,result);

//释放结果

if(result != NULL)

{

mysql_free_result(result);

}

mysql_close(&mydata);

system("pause");

return 1;

}

void process_result_set(MYSQL mydata, MYSQL_RES *result)

{

int rowcount = mysql_num_rows(result); //查询结果有多少行

//取得各字段名

MYSQL_FIELD *fields = NULL;

for(int i=0;fields=mysql_fetch_field(result);i++)

{

printf("%s ",fields->name);

}

printf("/n");

//依次读取各条记录

MYSQL_ROW currow = NULL;

while((currow = mysql_fetch_row(result)) != NULL)

{

for(int i = 0; i

{

printf("%s ",currow[i]?currow[i]:"NULL");

}

printf("/n");

}

}

void exit(MYSQL mydata,char *ep)

{

mysql_close(&mydata);

printf("%s,%s/n",ep,mysql_error(&mydata));

system("pause");

}

以上是在vs 2008下编译并验证无误的，若有问题大家一起讨论，哈

本文出自 “lynn” 博客

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