Yurttas/PL/DBL/oracle/F/03/Bank/v01.pc

 1/*  
 2REM
 3REM v01.pc
 4REM
 5REM Consider a view consisting of branch names and the names of
 6REM customers.
 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 branchname[16];
24  char customername[16];
25} allcustomer;
26
27void connect_to_oracle();
28void sql_error();
29
30void main(int argc, char* argv[]) {
31  connect_to_oracle();
32
33  EXEC SQL
34    CREATE VIEW AllCustomer
35      AS (SELECT branchname, customername
36          FROM Depositor)
37         UNION
38         (SELECT branchname, customername
39          FROM Borrower);
40
41  EXEC SQL DECLARE c CURSOR FOR
42    SELECT *
43    FROM AllCustomer;
44
45  EXEC SQL OPEN c;
46
47  EXEC SQL WHENEVER NOT FOUND DO BREAK;
48
49  printf("\nbranchname\tcustomername\n");
50  for(;;) {
51    EXEC SQL FETCH c INTO :allcustomer;
52    printf("%s\t%s\n", allcustomer.branchname,
53                       allcustomer.customername);
54  }
55
56  EXEC SQL CLOSE c;
57
58  EXEC SQL COMMIT WORK RELEASE;
59
60  exit(0);
61}
62
63
64void sql_error(char* msg) {
65  char err_msg[128];
66  int buflen, msglen;
67
68  EXEC SQL WHENEVER SQLERROR CONTINUE;
69
70  printf("%s \n", msg);
71  buflen = sizeof(err_msg);
72  sqlglm(err_msg, &buflen, &msglen);
73  printf("%.*s \n", msglen, err_msg);
74  exit(1);
75}
76
77
78void connect_to_oracle() {
79  /* get your username/passwd from "user_pwd.txt" file */
80
81  FILE *in_file;
82  in_file = fopen("user_pwd.txt", "r");
83  fscanf(in_file, "%s", u_name);
84  fscanf(in_file, "%s", pwd);
85
86  strncpy((char *) username.arr, u_name, UNAME_LEN);
87  username.len = strlen((char *) username.arr);
88
89  strncpy((char *) password.arr, pwd, PWD_LEN);
90  password.len = strlen((char *) password.arr);
91
92  EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
93  EXEC SQL CONNECT :username IDENTIFIED BY :password;
94
95  printf("connected to oracle - \n");
96}