Question

C++程序怎么得到数据库表里的记录数

用C++编写的程序，想要的到数据库中一个表里的所有记录的数量，怎么做？

Answer 1

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <mysql/mysql.h>

int main(){
MYSQL *mysql;
MYSQL_RES *res;
MYSQL_ROW row;
char query[1024];
int t,r;

mysql=mysql_init(NULL);
if (!mysql_real_connect(mysql,"test","root",
"123","test",0,NULL,0))
{
printf( "Error connecting to database: %s\n",mysql_error(mysql));
}
else printf("Connected...\n");

sprintf(query,"select count(*) from first");

t=mysql_query(mysql,query);

if (t)
{
printf("Error making query: %s\n",
mysql_error(mysql));
}
else printf("Query made...\n");
res=mysql_use_result(mysql);
for(r=0;r<mysql_field_count(mysql);r++){
row=mysql_fetch_row(res);
if(row<0) break;
for(t=0;t<mysql_num_fields(res);t++)
printf("%s",row[t]);
printf("\n");
}
mysql_close(mysql);
return 0;
}