Yurttas/PL/DBL/oracle/F/03/Bank/u04.pc

 1/*  
 2REM
 3REM u04.pc
 4REM
 5REM Delete all accounts at branches located in `Perryridge'.
 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
21struct {
22  char branchname[16];
23  int  accountnumber;
24  char customername[16];
25  int  balance;
26} depositor;
27
28void connect_to_oracle();
29void sql_error();
30
31void main(int argc, char* argv[]) {
32  connect_to_oracle();
33
34  EXEC SQL
35    DELETE FROM Depositor
36    WHERE branchname IN (SELECT branchname
37                         FROM Branch
38                         WHERE branchcity = 'PerryRidge');
39
40  EXEC SQL DECLARE c CURSOR FOR
41    SELECT *
42    FROM Depositor;
43
44  EXEC SQL OPEN c;
45
46  EXEC SQL WHENEVER NOT FOUND DO BREAK;
47
48  printf("\nbranchname\taccountnumber\tcustomername\tbalance\n");
49  for(;;) {
50    EXEC SQL FETCH c INTO :depositor;
51    printf("%s\t%d\t\t%s\t%d\n", depositor.branchname,
52                                 depositor.accountnumber,  
53                                 depositor.customername,
54                                 depositor.balance);
55  }
56
57  EXEC SQL CLOSE c;
58
59  EXEC SQL COMMIT WORK RELEASE;
60
61  exit(0);
62}
63
64
65void sql_error(char* msg) {
66  char err_msg[128];
67  int buflen, msglen;
68
69  EXEC SQL WHENEVER SQLERROR CONTINUE;
70
71  printf("%s \n", msg);
72  buflen = sizeof(err_msg);
73  sqlglm(err_msg, &buflen, &msglen);
74  printf("%.*s \n", msglen, err_msg);
75  exit(1);
76}
77
78
79void connect_to_oracle() {
80  /* get your username/passwd from "user_pwd.txt" file */
81
82  FILE *in_file;
83  in_file = fopen("user_pwd.txt", "r");
84  fscanf(in_file, "%s", u_name);
85  fscanf(in_file, "%s", pwd);
86
87  strncpy((char *) username.arr, u_name, UNAME_LEN);
88  username.len = strlen((char *) username.arr);
89
90  strncpy((char *) password.arr, pwd, PWD_LEN);
91  password.len = strlen((char *) password.arr);
92
93  EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
94  EXEC SQL CONNECT :username IDENTIFIED BY :password;
95
96  printf("connected to oracle - \n");
97}