Yurttas/PL/DBL/oracle/F/03/Bank/q111.pc

 1/*  
 2REM
 3REM q111.pc
 4REM
 5REM Find all customers who have an account at all branches
 6REM located in 'Brooklyn'.
 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 customername[16];
24} customer;
25
26void connect_to_oracle();
27void sql_error();
28
29void main(int argc, char* argv[]) {
30  connect_to_oracle();
31
32  EXEC SQL DECLARE c CURSOR FOR
33    SELECT DISTINCT S.customername
34    FROM Depositor S
35    WHERE NOT EXISTS ((SELECT branchname
36                       FROM Branch
37                       WHERE branchcity = 'Brooklyn')
38                      MINUS
39                      (SELECT T.branchname
40                       FROM Depositor T
41                       WHERE S.customername = T.customername));
42
43  EXEC SQL OPEN c;
44
45  EXEC SQL WHENEVER NOT FOUND DO BREAK;
46
47  printf("\ncustomername\n");
48  for(;;) {
49    EXEC SQL FETCH c INTO :customer;
50    printf("%s\n", customer.customername);
51  }
52
53  EXEC SQL CLOSE c;
54
55  EXEC SQL COMMIT WORK RELEASE;
56
57  exit(0);
58}
59
60
61void sql_error(char* msg) {
62  char err_msg[128];
63  int buflen, msglen;
64
65  EXEC SQL WHENEVER SQLERROR CONTINUE;
66
67  printf("%s \n", msg);
68  buflen = sizeof(err_msg);
69  sqlglm(err_msg, &buflen, &msglen);
70  printf("%.*s \n", msglen, err_msg);
71  exit(1);
72}
73
74
75void connect_to_oracle() {
76  /* get your username/passwd from "user_pwd.txt" file */
77
78  FILE *in_file;
79  in_file = fopen("user_pwd.txt", "r");
80  fscanf(in_file, "%s", u_name);
81  fscanf(in_file, "%s", pwd);
82
83  strncpy((char *) username.arr, u_name, UNAME_LEN);
84  username.len = strlen((char *) username.arr);
85
86  strncpy((char *) password.arr, pwd, PWD_LEN);
87  password.len = strlen((char *) password.arr);
88
89  EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
90  EXEC SQL CONNECT :username IDENTIFIED BY :password;
91
92  printf("connected to oracle - \n");
93}