Yurttas/PL/DBL/oracle/F/03/PC/q13.pc

 1/*  
 2REM
 3REM q13.pc
 4REM
 5REM Delete all Laptops made by a manufacturer that doesn't make
 6REM printers.
 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
22void connect_to_oracle();
23void sql_error();
24
25void main(int argc, char* argv[]) {
26  connect_to_oracle();
27
28  EXEC SQL
29    DELETE FROM Product
30    WHERE type='laptop'
31      AND maker NOT IN (SELECT maker
32		        FROM Product
33		        WHERE type='printer');
34
35  EXEC SQL
36    DELETE FROM Laptop
37    WHERE model NOT IN (SELECT model
38                        FROM Product);
39
40  EXEC SQL WHENEVER NOT FOUND DO BREAK;
41
42  EXEC SQL COMMIT WORK RELEASE;
43
44  exit(0);
45}
46
47
48void sql_error(char* msg) {
49  char err_msg[128];
50  int buflen, msglen;
51
52  EXEC SQL WHENEVER SQLERROR CONTINUE;
53
54  printf("%s \n", msg);
55  buflen = sizeof(err_msg);
56  sqlglm(err_msg, &buflen, &msglen);
57  printf("%.*s \n", msglen, err_msg);
58  exit(1);
59}
60
61
62void connect_to_oracle() {
63  /* get your username/passwd from "user_pwd.txt" file */
64
65  FILE *in_file;
66  in_file = fopen("user_pwd.txt", "r");
67  fscanf(in_file, "%s", u_name);
68  fscanf(in_file, "%s", pwd);
69
70  strncpy((char *) username.arr, u_name, UNAME_LEN);
71  username.len = strlen((char *) username.arr);
72
73  strncpy((char *) password.arr, pwd, PWD_LEN);
74  password.len = strlen((char *) password.arr);
75
76  EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
77  EXEC SQL CONNECT :username IDENTIFIED BY :password;
78
79  printf("connected to oracle - \n");
80}