刚学DB2,使用SQL/C的问题,谢

wkl

BFo800()
{
    EXEC SQL BEGIN DECLARE SECTION;
    double allamt;
    char  sqlstr[100];
    EXEC SQL END DECLARE SECTION;
    double thisamt;
    char   zh[23];

    GetDbl("AMT_2",&thisamt);         
    GetStr("ACCT_1",zh);
       trim(zh);

     sprintf(sqlstr,"select sum(q_je) from zz_wklpl%s where q_zh='%s';",fu2tell_f
2_code,zh);
    sprintf(sqlstr,"select sum(q_je) from zz_wklpl%s ",fu2tell_f2_code);
    EXEC SQL PREPARE wkl FROM :sqlstr;
   EXEC SQL EXECUTE wkl INTO :allamt;

   return 0;
}

经测EXEC SQL PREPARE wkl FROM :sqlstr;这行SQLCODE为0,
但EXEC SQL EXECUTE wkl INTO :allamt;这行SQLCODE=-518
请教各位大侠,我错哪了?