Yurttas/PL/DBL/oracle/F/03/Movie/q02.pc

 1/*  
 2REM
 3REM q02.pc
 4REM
 5REM Find all movies of 1998 ordered by title
 6REM and studios in ascending order grouped 
 7REM by BW and color.
 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} movie;
27
28void connect_to_oracle();
29void sql_error();
30
31void main(int argc, char* argv[]) {
32  connect_to_oracle();
33
34  EXEC SQL DECLARE c CURSOR FOR
35    SELECT title, studioname
36    FROM Movie
37    WHERE year = 1998
38    GROUP BY filmtype, title, studioname
39    ORDER BY title ASC, studioname ASC;
40
41  EXEC SQL OPEN c;
42
43  EXEC SQL WHENEVER NOT FOUND DO BREAK;
44
45  printf("\ntitle\tstudioname\n");
46  for(;;) {
47    EXEC SQL FETCH c INTO :movie;
48    printf("%s\t%s\n", movie.title,
49                       movie.studioname);
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}