Yurttas/PL/DBL/oracle/F/03/Company-A/q08.pc

 1/*  
 2REM
 3REM q08.pc
 4REM
 5REM Retrieve the average salary of all female employees.
 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  int avgsalary;
23} employee;
24
25void connect_to_oracle();
26void sql_error();
27
28void main(int argc, char* argv[]) {
29  connect_to_oracle();
30
31  EXEC SQL DECLARE c CURSOR FOR
32    SELECT AVG(salary)
33    FROM Employee
34    WHERE sex = 'F';
35
36  EXEC SQL OPEN c;
37
38  EXEC SQL WHENEVER NOT FOUND DO BREAK;
39
40  printf("\navgsalary\n");
41  for(;;) {
42    EXEC SQL FETCH c INTO :employee;
43    printf("%d\n", employee.avgsalary);
44  }
45
46  EXEC SQL CLOSE c;
47
48  EXEC SQL COMMIT WORK RELEASE;
49
50  exit(0);
51}
52
53
54void sql_error(char* msg) {
55  char err_msg[128];
56  int buflen, msglen;
57
58  EXEC SQL WHENEVER SQLERROR CONTINUE;
59
60  printf("%s \n", msg);
61  buflen = sizeof(err_msg);
62  sqlglm(err_msg, &buflen, &msglen);
63  printf("%.*s \n", msglen, err_msg);
64  exit(1);
65}
66
67
68void connect_to_oracle() {
69  /* get your username/passwd from "user_pwd.txt" file */
70
71  FILE *in_file;
72  in_file = fopen("user_pwd.txt", "r");
73  fscanf(in_file, "%s", u_name);
74  fscanf(in_file, "%s", pwd);
75
76  strncpy((char *) username.arr, u_name, UNAME_LEN);
77  username.len = strlen((char *) username.arr);
78
79  strncpy((char *) password.arr, pwd, PWD_LEN);
80  password.len = strlen((char *) password.arr);
81
82  EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
83  EXEC SQL CONNECT :username IDENTIFIED BY :password;
84
85  printf("connected to oracle - \n");
86}