1/*
2REM
3REM q03.pc
4REM
5REM Get supplier numbers for suppliers supplying some project
6REM with part 'P02' in a quantity greater than the
7REM average shipment quantity of part 'P02' for that project.
8REM
9*/
10
11#include <stdio.h>
12#include <sqlca.h>
13
14#define UNAME_LEN 32
15#define PWD_LEN 16
16
17VARCHAR username[UNAME_LEN]; /* VARCHAR is an Oracle-supplied struct */
18VARCHAR password[PWD_LEN]; /* varchar can be in lower case also. */
19
20char u_name[UNAME_LEN];
21char pwd[PWD_LEN];
22
23struct {
24 char sn[4];
25} suppliers;
26
27void connect_to_oracle();
28void sql_error();
29
30void main(int argc, char* argv[]) {
31 connect_to_oracle();
32
33 EXEC SQL DECLARE c CURSOR FOR
34 SELECT DISTINCT S.sn
35 FROM Shipments S
36 WHERE pn = 'P2'
37 AND quantity > (SELECT AVG(T.quantity)
38 FROM Shipments T
39 WHERE pn = 'P2'
40 AND S.jn = T.jn);
41
42 EXEC SQL OPEN c;
43
44 EXEC SQL WHENEVER NOT FOUND DO BREAK;
45
46 printf("\nsn\n");
47 for(;;) {
48 EXEC SQL FETCH c INTO :suppliers;
49 printf("%s\n", suppliers.sn);
50 }
51
52 EXEC SQL CLOSE c;
53
54 EXEC SQL COMMIT WORK RELEASE;
55
56 exit(0);
57}
58
59
60void sql_error(char* msg) {
61 char err_msg[128];
62 int buflen, msglen;
63
64 EXEC SQL WHENEVER SQLERROR CONTINUE;
65
66 printf("%s \n", msg);
67 buflen = sizeof(err_msg);
68 sqlglm(err_msg, &buflen, &msglen);
69 printf("%.*s \n", msglen, err_msg);
70 exit(1);
71}
72
73
74void connect_to_oracle() {
75 /* get your username/passwd from "user_pwd.txt" file */
76
77 FILE *in_file;
78 in_file = fopen("user_pwd.txt", "r");
79 fscanf(in_file, "%s", u_name);
80 fscanf(in_file, "%s", pwd);
81
82 strncpy((char *) username.arr, u_name, UNAME_LEN);
83 username.len = strlen((char *) username.arr);
84
85 strncpy((char *) password.arr, pwd, PWD_LEN);
86 password.len = strlen((char *) password.arr);
87
88 EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
89 EXEC SQL CONNECT :username IDENTIFIED BY :password;
90
91 printf("connected to oracle - \n");
92}