Yurttas/PL/DBL/oracle/F/03/Company-B/q02.pc

 1/*  
 2REM
 3REM q02.pc
 4REM
 5REM Find the name and city of of all employees who work for
 6REM 'First Bank Corporation'.
 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  char city[16];
25} works;
26
27void connect_to_oracle();
28void sql_error();
29
30void main(int argc, char* argv[]) {
31  connect_to_oracle();
32
33  EXEC SQL DECLARE c CURSOR FOR
34    SELECT E.employeename, E.city 
35    FROM Employee E, Works W 
36    WHERE E.employeename=W.employeename 
37      AND W.companyname='First Bank Corporation';
38
39  EXEC SQL OPEN c;
40
41  EXEC SQL WHENEVER NOT FOUND DO BREAK;
42
43  printf("\nemployeename\tcity\n");
44  for(;;) {
45    EXEC SQL FETCH c INTO :works;
46    printf("%s\t%s\n", works.employeename,
47                       works.city);
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}