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

 1/*  
 2REM
 3REM q06.pc
 4REM
 5REM List the movies by title, director, and 
 6REM studio that are longer than 'Amistad'
 7REM in the given Movie database.
 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 title[24];
25  char studioname[32];
26  char name[18];
27} movie;
28
29void connect_to_oracle();
30void sql_error();
31
32void main(int argc, char* argv[]) {
33  connect_to_oracle();
34
35  EXEC SQL DECLARE c CURSOR FOR
36    SELECT title, studioname, name
37    FROM MovieExec, Movie
38    WHERE producercn = cn
39      AND length > (SELECT length
40                    FROM Movie
41                    WHERE title = 'Amistad');
42
43  EXEC SQL OPEN c;
44
45  EXEC SQL WHENEVER NOT FOUND DO BREAK;
46
47  printf("\ntitle\tstudioname\tname\n");
48  for(;;) {
49    EXEC SQL FETCH c INTO :movie;
50    printf("%s\t%s\t%s\n", movie.title,
51                           movie.studioname,
52                           movie.name);
53  }
54
55  EXEC SQL CLOSE c;
56
57  EXEC SQL COMMIT WORK RELEASE;
58
59  exit(0);
60}
61
62
63void sql_error(char* msg) {
64  char err_msg[128];
65  int buflen, msglen;
66
67  EXEC SQL WHENEVER SQLERROR CONTINUE;
68
69  printf("%s \n", msg);
70  buflen = sizeof(err_msg);
71  sqlglm(err_msg, &buflen, &msglen);
72  printf("%.*s \n", msglen, err_msg);
73  exit(1);
74}
75
76
77void connect_to_oracle() {
78  /* get your username/passwd from "user_pwd.txt" file */
79
80  FILE *in_file;
81  in_file = fopen("user_pwd.txt", "r");
82  fscanf(in_file, "%s", u_name);
83  fscanf(in_file, "%s", pwd);
84
85  strncpy((char *) username.arr, u_name, UNAME_LEN);
86  username.len = strlen((char *) username.arr);
87
88  strncpy((char *) password.arr, pwd, PWD_LEN);
89  password.len = strlen((char *) password.arr);
90
91  EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
92  EXEC SQL CONNECT :username IDENTIFIED BY :password;
93
94  printf("connected to oracle - \n");
95}