Yurttas/PL/DBL/oracle/F/03/PC/q12.pc

 1/*  
 2REM
 3REM q12.pc
 4REM
 5REM Delete all PC's with less than 2 gigabyte of hard disk.
 6REM
 7*/
 8
 9#include <stdio.h>
10#include <sqlca.h>
11
12#define UNAME_LEN 32
13#define PWD_LEN   16
14
15VARCHAR username[UNAME_LEN]; /* VARCHAR is an Oracle-supplied struct */
16VARCHAR password[PWD_LEN];   /* varchar can be in lower case also. */
17
18char u_name[UNAME_LEN];
19char pwd[PWD_LEN];
20
21void connect_to_oracle();
22void sql_error();
23
24void main(int argc, char* argv[]) {
25  connect_to_oracle();
26
27  EXEC SQL
28    DELETE FROM Product
29    WHERE model IN (SELECT model
30		    FROM PC
31                    WHERE hd<2.0);
32
33  EXEC SQL
34    DELETE FROM PC
35    WHERE hd<2.0;
36
37  EXEC SQL WHENEVER NOT FOUND DO BREAK;
38
39  EXEC SQL COMMIT WORK RELEASE;
40
41  exit(0);
42}
43
44
45void sql_error(char* msg) {
46  char err_msg[128];
47  int buflen, msglen;
48
49  EXEC SQL WHENEVER SQLERROR CONTINUE;
50
51  printf("%s \n", msg);
52  buflen = sizeof(err_msg);
53  sqlglm(err_msg, &buflen, &msglen);
54  printf("%.*s \n", msglen, err_msg);
55  exit(1);
56}
57
58
59void connect_to_oracle() {
60  /* get your username/passwd from "user_pwd.txt" file */
61
62  FILE *in_file;
63  in_file = fopen("user_pwd.txt", "r");
64  fscanf(in_file, "%s", u_name);
65  fscanf(in_file, "%s", pwd);
66
67  strncpy((char *) username.arr, u_name, UNAME_LEN);
68  username.len = strlen((char *) username.arr);
69
70  strncpy((char *) password.arr, pwd, PWD_LEN);
71  password.len = strlen((char *) password.arr);
72
73  EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
74  EXEC SQL CONNECT :username IDENTIFIED BY :password;
75
76  printf("connected to oracle - \n");
77}