1/*
2REM
3REM q01.pc
4REM
5REM Retrieve the names of employees in department 5
6REM who work more than 10 hours per week on the
7REM 'ProductX' project.
8REM
9*/
10
11#include <stdio.h>
12#include <sqlca.h>
13
14#define UNAME_LEN 32
15#define PWD_LEN 16
16
17VARCHAR username[UNAME_LEN]; /* VARCHAR is an Oracle-supplied struct */
18VARCHAR password[PWD_LEN]; /* varchar can be in lower case also. */
19
20char u_name[UNAME_LEN];
21char pwd[PWD_LEN];
22
23struct {
24 char fname[12];
25 char minit;
26 char lname[16];
27} employee;
28
29void connect_to_oracle();
30void sql_error();
31
32void main(int argc, char* argv[]) {
33 connect_to_oracle();
34
35 EXEC SQL DECLARE c CURSOR FOR
36 SELECT DISTINCT fname, minit, lname
37 FROM Employee, Project, WorksOn
38 WHERE Employee.dno = Project.dnum
39 AND Employee.ssn = WorksOn.essn
40 AND Project.pnumber = WorksOn.pno
41 AND Employee.dno = 5
42 AND hours > 10
43 AND pname = 'ProductX';
44
45 EXEC SQL OPEN c;
46
47 EXEC SQL WHENEVER NOT FOUND DO BREAK;
48
49 printf("\nfname\tminit\tlname\n");
50 for(;;) {
51 EXEC SQL FETCH c INTO :employee;
52 printf("%s\t%s\t%s\n", employee.fname,
53 employee.minit,
54 employee.lname);
55 }
56
57 EXEC SQL CLOSE c;
58
59 EXEC SQL COMMIT WORK RELEASE;
60
61 exit(0);
62}
63
64
65void sql_error(char* msg) {
66 char err_msg[128];
67 int buflen, msglen;
68
69 EXEC SQL WHENEVER SQLERROR CONTINUE;
70
71 printf("%s \n", msg);
72 buflen = sizeof(err_msg);
73 sqlglm(err_msg, &buflen, &msglen);
74 printf("%.*s \n", msglen, err_msg);
75 exit(1);
76}
77
78
79void connect_to_oracle() {
80 /* get your username/passwd from "user_pwd.txt" file */
81
82 FILE *in_file;
83 in_file = fopen("user_pwd.txt", "r");
84 fscanf(in_file, "%s", u_name);
85 fscanf(in_file, "%s", pwd);
86
87 strncpy((char *) username.arr, u_name, UNAME_LEN);
88 username.len = strlen((char *) username.arr);
89
90 strncpy((char *) password.arr, pwd, PWD_LEN);
91 password.len = strlen((char *) password.arr);
92
93 EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
94 EXEC SQL CONNECT :username IDENTIFIED BY :password;
95
96 printf("connected to oracle - \n");
97}