1/*
2REM
3REM q07.pc
4REM
5REM Find all employees who earn more than every employee of
6REM 'Small 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} works;
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 employeename
34 FROM Works
35 WHERE salary > ALL (SELECT salary
36 FROM Works
37 WHERE companyname='Small Bank Corporation');
38
39 EXEC SQL OPEN c;
40
41 EXEC SQL WHENEVER NOT FOUND DO BREAK;
42
43 printf("\nemployeename\n");
44 for(;;) {
45 EXEC SQL FETCH c INTO :works;
46 printf("%s\n", works.employeename);
47 }
48
49 EXEC SQL CLOSE c;
50
51 EXEC SQL COMMIT WORK RELEASE;
52
53 exit(0);
54}
55
56
57void sql_error(char* msg) {
58 char err_msg[128];
59 int buflen, msglen;
60
61 EXEC SQL WHENEVER SQLERROR CONTINUE;
62
63 printf("%s \n", msg);
64 buflen = sizeof(err_msg);
65 sqlglm(err_msg, &buflen, &msglen);
66 printf("%.*s \n", msglen, err_msg);
67 exit(1);
68}
69
70
71void connect_to_oracle() {
72 /* get your username/passwd from "user_pwd.txt" file */
73
74 FILE *in_file;
75 in_file = fopen("user_pwd.txt", "r");
76 fscanf(in_file, "%s", u_name);
77 fscanf(in_file, "%s", pwd);
78
79 strncpy((char *) username.arr, u_name, UNAME_LEN);
80 username.len = strlen((char *) username.arr);
81
82 strncpy((char *) password.arr, pwd, PWD_LEN);
83 password.len = strlen((char *) password.arr);
84
85 EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
86 EXEC SQL CONNECT :username IDENTIFIED BY :password;
87
88 printf("connected to oracle - \n");
89}