Yurttas/PL/DBL/oracle/F/03/Company-A/q07.pc
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1/*
2REM
3REM q07.pc
4REM
5REM For each department, retrieve the department name and the
6REM average salary of departments working in that department.
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 dname[16];
24 int avgsalary;
25} department;
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 dname, AVG(salary)
35 FROM Department, Employee
36 WHERE dnumber = dno
37 GROUP BY dname;
38
39 EXEC SQL OPEN c;
40
41 EXEC SQL WHENEVER NOT FOUND DO BREAK;
42
43 printf("\ndname\tavgsalary\n");
44 for(;;) {
45 EXEC SQL FETCH c INTO :department;
46 printf("%s\t%d\n", department.dname,
47 department.avgsalary);
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}