c如何与sql数据库连接?

用odbc或db-libary给你一小段db-library程序
int CreateProc(PDBPROCESS * dbproc,char * pwd,char * sname)
{
PLOGINREC login;
// char sname[20];
unsigned short num;

// memset(sname,0,sizeof(sname));
login=dblogin();
DBSETLUSER(login,"sa");
if(strlen(pwd)>0)
{
DBSETLPWD(login,pwd);
}

DBSETLVERSION(login, DBVER60);
dbprocerrhandle(login,err_handler);
dbprocmsghandle(login,msg_handler);
// dbserverenum(LOC_SEARCH,sname,sizeof(sname),&num);
DBSETLTIME(login,20);
*dbproc=dbopen(login,sname);
if(*dbproc == NULL){

return ERR;
}

dbuse(*dbproc,"ccenter");
dbfreelogin(login);
return OK;
}

int check_grp_no(int grp_no, unsigned int * small_len)
{
int res=0;
int cnt=0;
dbcancel(dbproc);
dbfcmd(dbproc," select small_len from grp_table where grp_no=%d",grp_no);<