Yurttas/PL/DBL/oracle/F/03/Movie/q04.pc

 1/*  
 2REM
 3REM q04.pc
 4REM
 5REM Find the names and addresses of movie stars
 6REM of movies produced by 'Steven Spielberg'.
 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 name[18];
24  char address[24];
25} moviestar;
26
27void connect_to_oracle();
28void sql_error();
29
30void main(int argc, char* argv[]) {
31  connect_to_oracle();
32
33  EXEC SQL DECLARE c CURSOR FOR
34    SELECT MS.name, MS.address
35    FROM MovieStar MS, MovieExec ME, Movie M, StarsIn SI
36    WHERE ME.name = 'Steven Spielberg'
37      AND ME.cn = M.producercn
38      AND M.title = SI.title
39      AND SI.name = MS.name;
40
41  EXEC SQL OPEN c;
42
43  EXEC SQL WHENEVER NOT FOUND DO BREAK;
44
45  printf("\nname\taddress\n");
46  for(;;) {
47    EXEC SQL FETCH c INTO :moviestar;
48    printf("%s\t%s\n", moviestar.name,
49                       moviestar.address);
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}