Yurttas/PL/DBL/oracle/F/03/Company-B/q17.pc

 1/*  
 2REM
 3REM q17.pc
 4REM
 5REM Delete all tuples in the works relation for employees
 6REM of 'Small Bank Corporation'.
 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 employeename[16];
24  char companyname[24];
25  int salary;
26} works;
27
28void connect_to_oracle();
29void sql_error();
30
31void main(int argc, char* argv[]) {
32  connect_to_oracle();
33
34  EXEC SQL
35    DELETE FROM Works
36    WHERE companyname = 'Small Bank Corporation';
37
38  EXEC SQL DECLARE c CURSOR FOR
39    SELECT *
40    FROM Works;
41
42  EXEC SQL OPEN c;
43
44  EXEC SQL WHENEVER NOT FOUND DO BREAK;
45
46  printf("\nemployeename\tcompanyname\tsalary\n");
47  for(;;) {
48    EXEC SQL FETCH c INTO :works;
49    printf("%s\t%s\t%d\n", works.employeename,
50                           works.companyname,
51                           works.salary);
52  }
53
54  EXEC SQL CLOSE c;
55
56  EXEC SQL COMMIT WORK RELEASE;
57
58  exit(0);
59}
60
61
62void sql_error(char* msg) {
63  char err_msg[128];
64  int buflen, msglen;
65
66  EXEC SQL WHENEVER SQLERROR CONTINUE;
67
68  printf("%s \n", msg);
69  buflen = sizeof(err_msg);
70  sqlglm(err_msg, &buflen, &msglen);
71  printf("%.*s \n", msglen, err_msg);
72  exit(1);
73}
74
75
76void connect_to_oracle() {
77  /* get your username/passwd from "user_pwd.txt" file */
78
79  FILE *in_file;
80  in_file = fopen("user_pwd.txt", "r");
81  fscanf(in_file, "%s", u_name);
82  fscanf(in_file, "%s", pwd);
83
84  strncpy((char *) username.arr, u_name, UNAME_LEN);
85  username.len = strlen((char *) username.arr);
86
87  strncpy((char *) password.arr, pwd, PWD_LEN);
88  password.len = strlen((char *) password.arr);
89
90  EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
91  EXEC SQL CONNECT :username IDENTIFIED BY :password;
92
93  printf("connected to oracle - \n");
94}