Yurttas/PL/DBL/oracle/F/03/Company-A/q02.pc

 1/*  
 2REM
 3REM q02.pc
 4REM
 5REM List the names of employees who have a dependent with
 6REM the same first name as themselves.
 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 minit;
25  char lname[16];
26} employee;
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 DISTINCT fname, minit, lname
36    FROM Employee, Dependent
37    WHERE ssn = essn
38      AND dependentname = fname;
39
40  EXEC SQL OPEN c;
41
42  EXEC SQL WHENEVER NOT FOUND DO BREAK;
43
44  printf("\nfname\tminit\tlname\n");
45  for(;;) {
46    EXEC SQL FETCH c INTO :employee;
47    printf("%s\t%s\t%s\n", employee.fname,
48                           employee.minit,
49                           employee.lname);
50  }
51
52  EXEC SQL CLOSE c;
53
54  EXEC SQL COMMIT WORK RELEASE;
55
56  exit(0);
57}
58
59
60void sql_error(char* msg) {
61  char err_msg[128];
62  int buflen, msglen;
63
64  EXEC SQL WHENEVER SQLERROR CONTINUE;
65
66  printf("%s \n", msg);
67  buflen = sizeof(err_msg);
68  sqlglm(err_msg, &buflen, &msglen);
69  printf("%.*s \n", msglen, err_msg);
70  exit(1);
71}
72
73
74void connect_to_oracle() {
75  /* get your username/passwd from "user_pwd.txt" file */
76
77  FILE *in_file;
78  in_file = fopen("user_pwd.txt", "r");
79  fscanf(in_file, "%s", u_name);
80  fscanf(in_file, "%s", pwd);
81
82  strncpy((char *) username.arr, u_name, UNAME_LEN);
83  username.len = strlen((char *) username.arr);
84
85  strncpy((char *) password.arr, pwd, PWD_LEN);
86  password.len = strlen((char *) password.arr);
87
88  EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
89  EXEC SQL CONNECT :username IDENTIFIED BY :password;
90
91  printf("connected to oracle - \n");
92}