Yurttas/PL/DBL/oracle/F/03/PC/q06.pc
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1/*
2REM
3REM q06.pc
4REM
5REM Find those manufacturers of at least two different
6REM computers (PC's or laptops) with speeds of at least 133.
7REM
8*/
9
10#include <stdio.h>
11#include <sqlca.h>
12
13#define UNAME_LEN 32
14#define PWD_LEN 16
15
16VARCHAR username[UNAME_LEN]; /* VARCHAR is an Oracle-supplied struct */
17VARCHAR password[PWD_LEN]; /* varchar can be in lower case also. */
18
19char u_name[UNAME_LEN];
20char pwd[PWD_LEN];
21
22struct {
23 char maker[6];
24} product;
25
26void connect_to_oracle();
27void sql_error();
28
29void main(int argc, char* argv[]) {
30 connect_to_oracle();
31
32 EXEC SQL DECLARE c CURSOR FOR
33 SELECT maker
34 FROM Product
35 WHERE model IN ( (SELECT P.model
36 FROM Product P, PC
37 WHERE P.model=PC.model
38 AND PC.speed>=133)
39 UNION
40 (SELECT P.model
41 FROM Product P, Laptop L
42 WHERE P.model=L.model
43 AND L.speed>=133) )
44 GROUP BY maker
45 HAVING COUNT(model)>=2;
46
47 EXEC SQL OPEN c;
48
49 EXEC SQL WHENEVER NOT FOUND DO BREAK;
50
51 printf("\nmaker\n");
52 for(;;) {
53 EXEC SQL FETCH c INTO :product;
54 printf("%s\n", product.maker);
55 }
56
57 EXEC SQL CLOSE c;
58
59 EXEC SQL COMMIT WORK RELEASE;
60
61 exit(0);
62}
63
64
65void sql_error(char* msg) {
66 char err_msg[128];
67 int buflen, msglen;
68
69 EXEC SQL WHENEVER SQLERROR CONTINUE;
70
71 printf("%s \n", msg);
72 buflen = sizeof(err_msg);
73 sqlglm(err_msg, &buflen, &msglen);
74 printf("%.*s \n", msglen, err_msg);
75 exit(1);
76}
77
78
79void connect_to_oracle() {
80 /* get your username/passwd from "user_pwd.txt" file */
81
82 FILE *in_file;
83 in_file = fopen("user_pwd.txt", "r");
84 fscanf(in_file, "%s", u_name);
85 fscanf(in_file, "%s", pwd);
86
87 strncpy((char *) username.arr, u_name, UNAME_LEN);
88 username.len = strlen((char *) username.arr);
89
90 strncpy((char *) password.arr, pwd, PWD_LEN);
91 password.len = strlen((char *) password.arr);
92
93 EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
94 EXEC SQL CONNECT :username IDENTIFIED BY :password;
95
96 printf("connected to oracle - \n");
97}