1/*
2REM
3REM q04.pc
4REM
5REM For each project, list the project name and
6REM the total hours per week (by all employees) spent
7REM on that 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 pname[16];
25 int sumhours
26} project;
27
28void connect_to_oracle();
29void sql_error();
30
31void main(int argc, char* argv[]) {
32 connect_to_oracle();
33
34 EXEC SQL DECLARE c CURSOR FOR
35 SELECT pname, SUM(hours)
36 FROM Project, WorksOn
37 WHERE pnumber = pno
38 GROUP BY pname;
39
40 EXEC SQL OPEN c;
41
42 EXEC SQL WHENEVER NOT FOUND DO BREAK;
43
44 char pname[16];
45 int sumhours
46 printf("\npname\tsumhours\n");
47 for(;;) {
48 EXEC SQL FETCH c INTO :employee;
49 printf("%s\t%d\n", project.pname,
50 project.sumhours);
51 }
52
53 EXEC SQL CLOSE c;
54
55 EXEC SQL COMMIT WORK RELEASE;
56
57 exit(0);
58}
59
60
61void sql_error(char* msg) {
62 char err_msg[128];
63 int buflen, msglen;
64
65 EXEC SQL WHENEVER SQLERROR CONTINUE;
66
67 printf("%s \n", msg);
68 buflen = sizeof(err_msg);
69 sqlglm(err_msg, &buflen, &msglen);
70 printf("%.*s \n", msglen, err_msg);
71 exit(1);
72}
73
74
75void connect_to_oracle() {
76 /* get your username/passwd from "user_pwd.txt" file */
77
78 FILE *in_file;
79 in_file = fopen("user_pwd.txt", "r");
80 fscanf(in_file, "%s", u_name);
81 fscanf(in_file, "%s", pwd);
82
83 strncpy((char *) username.arr, u_name, UNAME_LEN);
84 username.len = strlen((char *) username.arr);
85
86 strncpy((char *) password.arr, pwd, PWD_LEN);
87 password.len = strlen((char *) password.arr);
88
89 EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
90 EXEC SQL CONNECT :username IDENTIFIED BY :password;
91
92 printf("connected to oracle - \n");
93}