Yurttas/PL/DBL/oracle/F/03/Movie/q05.pc
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1/*
2REM
3REM q05.pc
4REM
5REM Which stars appeared in movies produced by
6REM 'Disney' studios in 1997 but not in 1998
7REM 'Disney' movies.
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 name[18];
25} starsin;
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 SI.name
35 FROM Movie M, StarsIn SI
36 WHERE M.year = 1997
37 AND M.studioname = 'Disney'
38 AND M.title = SI.title
39 AND SI.name NOT IN (SELECT SI.name
40 FROM Movie M, StarsIn SI
41 WHERE M.year = 1998
42 AND M.studioname = 'Disney'
43 AND M.title = SI.title);
44
45 EXEC SQL OPEN c;
46
47 EXEC SQL WHENEVER NOT FOUND DO BREAK;
48
49 printf("\nname\n");
50 for(;;) {
51 EXEC SQL FETCH c INTO :starsin;
52 printf("%s\n", starsin.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}