Yurttas/PL/DBL/oracle/F/03/Company-B/q05.pc

 1/*  
 2REM
 3REM q05.pc
 4REM
 5REM Find all employees who live in the same City and
 6REM on the same Street as their Manager.
 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 employeename[16];
24} employee;
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 E1.employeename 
34    FROM Employee E1, Manages M, Employee E2 
35    WHERE E1.employeename = M.employeename 
36      AND M.managername = E2.employeename 
37      AND E1.Street = E2.Street 
38      AND E1.City = E2.City;
39
40  EXEC SQL OPEN c;
41
42  EXEC SQL WHENEVER NOT FOUND DO BREAK;
43
44  printf("\nemployeename\n");
45  for(;;) {
46    EXEC SQL FETCH c INTO :employee;
47    printf("%s\n", employee.employeename);
48  }
49
50  EXEC SQL CLOSE c;
51
52  EXEC SQL COMMIT WORK RELEASE;
53
54  exit(0);
55}
56
57
58void sql_error(char* msg) {
59  char err_msg[128];
60  int buflen, msglen;
61
62  EXEC SQL WHENEVER SQLERROR CONTINUE;
63
64  printf("%s \n", msg);
65  buflen = sizeof(err_msg);
66  sqlglm(err_msg, &buflen, &msglen);
67  printf("%.*s \n", msglen, err_msg);
68  exit(1);
69}
70
71
72void connect_to_oracle() {
73  /* get your username/passwd from "user_pwd.txt" file */
74
75  FILE *in_file;
76  in_file = fopen("user_pwd.txt", "r");
77  fscanf(in_file, "%s", u_name);
78  fscanf(in_file, "%s", pwd);
79
80  strncpy((char *) username.arr, u_name, UNAME_LEN);
81  username.len = strlen((char *) username.arr);
82
83  strncpy((char *) password.arr, pwd, PWD_LEN);
84  password.len = strlen((char *) password.arr);
85
86  EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
87  EXEC SQL CONNECT :username IDENTIFIED BY :password;
88
89  printf("connected to oracle - \n");
90}