linux 下 用c语言创建mysql数据库笔记（二）

linux 下 用c语言创建mysql数据库笔记（二）

                        －－－－－－－两个简单的例子，供参考比较

《例一》
#include <stdio.h>
#include <stdlib.h>
#include "/usr/include/mysql/mysql.h"      

int main(){
MYSQL my_connection;

int res;
mysql_init(&my_connection);

if(mysql_real_connect(&my_connection,"localhost","root","123","data",0,NULL,CLIENT_FOUND_ROWS)){
printf("connection success/n");
res= mysql_query(&my_connection,"select * from ip");
  if(!res){
      printf("%lu",(unsigned long)mysql_affected_rows(&my_connection));
}
  else{
   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,"insert error %d:%s/n",mysql_errno(&my_connection), mysql_error(&my_connection));
}
}
 return EXIT_SUCCESS;
}

编译：
 gcc -o mysql.out mysql.c -L /usr/lib/mysql/ -l mysqlclient




《例二》
#include<stdio.h>
#include<stdlib.h>
#include"/usr/include/mysql/mysql.h"      

int main(int argc,char**argv)
{
    MYSQL *sql_p;
    MYSQL_RES *result_p;
    MYSQL_ROW row_p;
    int res;

    sql_p=mysql_init(NULL);
    if(sql_p==NULL){
        printf("Init error!/n");
        exit(1);
    }

    sql_p=mysql_real_connect(sql_p,"localhost","root","123",
                    "data",0,NULL,0);
    if(!sql_p){
        fprintf(stderr,"%d:%s/n",mysql_errno(sql_p),mysql_error(sql_p));
        exit(1);
    }

    res=mysql_query(sql_p,"CREATE TABLE hello(hello char(20))");
    if(res){
        printf("Creat table error!/n");
        exit(1);
    }

    res=mysql_query(sql_p,"INSERT INTO hello(hello) VALUES('Hello Mysql')");
    if(res){
        printf("Insert error!/n");
        exit(1);
    }
   
    res=mysql_query(sql_p,"SELECT hello FROM hello");
    if(res){
        printf("Select error!/n");
        exit(1);
    }
   
    result_p=mysql_use_result(sql_p);
    if(!result_p){
        printf("mysql_use error!/n");
        exit(1);
    }

    row_p=mysql_fetch_row(result_p);    

    mysql_close(sql_p);
    return 0;
}

编译：
gcc -o mysql.out mysql.c -L /usr/lib/mysql/ -l mysqlclient