Yurttas/PL/DBL/oracle/F/03/PC/q06.pc

 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}