Yurttas/PL/DBL/oracle/F/03/Company-A/q10.pc

 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}