Yurttas/PL/DBL/oracle/F/03/Company-A/q03.pc

 1/*  
 2REM
 3REM q03.pc
 4REM
 5REM Find the names of employees who are directly supervised
 6REM by 'Franklin Wong'.
 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 E1.fname, E1.minit, E1.lname 
36    FROM Employee E1, Employee E2
37    WHERE E1.superssn = E2.ssn
38      AND E2.fname = 'Franklin'
39      AND E2.lname = 'Wong';
40
41  EXEC SQL OPEN c;
42
43  EXEC SQL WHENEVER NOT FOUND DO BREAK;
44
45  printf("\nfname\tminit\tlname\n");
46  for(;;) {
47    EXEC SQL FETCH c INTO :employee;
48    printf("%s\t%s\t%s\n", employee.fname,
49                           employee.minit,
50                           employee.lname);
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}