Yurttas/PL/DBL/oracle/F/03/Movie/q01.pc

 1/*  
 2REM
 3REM q01.pc
 4REM
 5REM Find all movies produced by 'Paramount'
 6REM studios in between 1990 - 1995.
 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 title[24];
24} movie;
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 title
34    FROM Movie
35    WHERE studioname = 'Paramount'
36      AND year BETWEEN 1990 AND 1995;
37
38  EXEC SQL OPEN c;
39
40  EXEC SQL WHENEVER NOT FOUND DO BREAK;
41
42  printf("\ntitle\n");
43  for(;;) {
44    EXEC SQL FETCH c INTO :movie;
45    printf("%s\n", movie.title);
46  }
47
48  EXEC SQL CLOSE c;
49
50  EXEC SQL COMMIT WORK RELEASE;
51
52  exit(0);
53}
54
55
56void sql_error(char* msg) {
57  char err_msg[128];
58  int buflen, msglen;
59
60  EXEC SQL WHENEVER SQLERROR CONTINUE;
61
62  printf("%s \n", msg);
63  buflen = sizeof(err_msg);
64  sqlglm(err_msg, &buflen, &msglen);
65  printf("%.*s \n", msglen, err_msg);
66  exit(1);
67}
68
69
70void connect_to_oracle() {
71  /* get your username/passwd from "user_pwd.txt" file */
72
73  FILE *in_file;
74  in_file = fopen("user_pwd.txt", "r");
75  fscanf(in_file, "%s", u_name);
76  fscanf(in_file, "%s", pwd);
77
78  strncpy((char *) username.arr, u_name, UNAME_LEN);
79  username.len = strlen((char *) username.arr);
80
81  strncpy((char *) password.arr, pwd, PWD_LEN);
82  password.len = strlen((char *) password.arr);
83
84  EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
85  EXEC SQL CONNECT :username IDENTIFIED BY :password;
86
87  printf("connected to oracle - \n");
88}