Yurttas/PL/DBL/oracle/F/03/PC/q04.pc

 1/*  
 2REM
 3REM q04.pc
 4REM
 5REM Find the model numbers of all color laser printers.
 6REM
 7*/
 8
 9#include <stdio.h>
10#include <sqlca.h>
11
12#define UNAME_LEN 32
13#define PWD_LEN   16
14
15VARCHAR username[UNAME_LEN]; /* VARCHAR is an Oracle-supplied struct */
16VARCHAR password[PWD_LEN];   /* varchar can be in lower case also. */
17
18char u_name[UNAME_LEN];
19char pwd[PWD_LEN];
20
21struct {
22  char model[6];
23} printer;
24
25void connect_to_oracle();
26void sql_error();
27
28void main(int argc, char* argv[]) {
29  connect_to_oracle();
30
31  EXEC SQL DECLARE c CURSOR FOR
32    SELECT model
33    FROM Printer
34    WHERE color='true'
35      AND type='laser';
36
37  EXEC SQL OPEN c;
38
39  EXEC SQL WHENEVER NOT FOUND DO BREAK;
40
41  printf("\nmodel\n");
42  for(;;) {
43    EXEC SQL FETCH c INTO :printer;
44    printf("%s\n", printer.model);
45  }
46
47  EXEC SQL CLOSE c;
48
49  EXEC SQL COMMIT WORK RELEASE;
50
51  exit(0);
52}
53
54
55void sql_error(char* msg) {
56  char err_msg[128];
57  int buflen, msglen;
58
59  EXEC SQL WHENEVER SQLERROR CONTINUE;
60
61  printf("%s \n", msg);
62  buflen = sizeof(err_msg);
63  sqlglm(err_msg, &buflen, &msglen);
64  printf("%.*s \n", msglen, err_msg);
65  exit(1);
66}
67
68
69void connect_to_oracle() {
70  /* get your username/passwd from "user_pwd.txt" file */
71
72  FILE *in_file;
73  in_file = fopen("user_pwd.txt", "r");
74  fscanf(in_file, "%s", u_name);
75  fscanf(in_file, "%s", pwd);
76
77  strncpy((char *) username.arr, u_name, UNAME_LEN);
78  username.len = strlen((char *) username.arr);
79
80  strncpy((char *) password.arr, pwd, PWD_LEN);
81  password.len = strlen((char *) password.arr);
82
83  EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
84  EXEC SQL CONNECT :username IDENTIFIED BY :password;
85
86  printf("connected to oracle - \n");
87}