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