Yurttas/PL/DBL/oracle/F/03/Company-A/q10.pc
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1/*
2REM
3REM q10.pc
4REM
5REM List the names of department managers who have
6REM no dependents.
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 fname[12];
24 char lname[16];
25} employee;
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 fname, lname
35 FROM Employee, Department
36 WHERE mgrssn = ssn
37 AND ssn NOT IN (SELECT essn
38 FROM Dependent);
39
40 EXEC SQL OPEN c;
41
42 EXEC SQL WHENEVER NOT FOUND DO BREAK;
43
44 printf("\nfname\tlname\n");
45 for(;;) {
46 EXEC SQL FETCH c INTO :employee;
47 printf("%s\t%s\n", employee.fname,
48 employee.lname);
49 }
50
51 EXEC SQL CLOSE c;
52
53 EXEC SQL COMMIT WORK RELEASE;
54
55 exit(0);
56}
57
58
59void sql_error(char* msg) {
60 char err_msg[128];
61 int buflen, msglen;
62
63 EXEC SQL WHENEVER SQLERROR CONTINUE;
64
65 printf("%s \n", msg);
66 buflen = sizeof(err_msg);
67 sqlglm(err_msg, &buflen, &msglen);
68 printf("%.*s \n", msglen, err_msg);
69 exit(1);
70}
71
72
73void connect_to_oracle() {
74 /* get your username/passwd from "user_pwd.txt" file */
75
76 FILE *in_file;
77 in_file = fopen("user_pwd.txt", "r");
78 fscanf(in_file, "%s", u_name);
79 fscanf(in_file, "%s", pwd);
80
81 strncpy((char *) username.arr, u_name, UNAME_LEN);
82 username.len = strlen((char *) username.arr);
83
84 strncpy((char *) password.arr, pwd, PWD_LEN);
85 password.len = strlen((char *) password.arr);
86
87 EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
88 EXEC SQL CONNECT :username IDENTIFIED BY :password;
89
90 printf("connected to oracle - \n");
91}