Yurttas/PL/DBL/oracle/F/03/Company-B/q15.pc

 1/*  
 2REM
 3REM q15.pc
 4REM
 5REM Give all managers a 10 percent raise.
 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 employeename[16];
23  char companyname[24];
24  int salary;
25} works;
26
27void connect_to_oracle();
28void sql_error();
29
30void main(int argc, char* argv[]) {
31  connect_to_oracle();
32
33  EXEC SQL
34    UPDATE Works
35    SET salary = salary * 1.1
36    WHERE employeename IN (SELECT managername
37                           FROM Manages);
38
39  EXEC SQL DECLARE c CURSOR FOR
40    SELECT *
41    FROM Works;
42
43  EXEC SQL OPEN c;
44
45  EXEC SQL WHENEVER NOT FOUND DO BREAK;
46
47  printf("\nemployeename\tcompanyname\tsalary\n");
48  for(;;) {
49    EXEC SQL FETCH c INTO :works;
50    printf("%s\t%s\t%d\n", works.employeename,
51                           works.companyname,
52                           works.salary);
53  }
54
55  EXEC SQL CLOSE c;
56
57  EXEC SQL COMMIT WORK RELEASE;
58
59  exit(0);
60}
61
62
63void sql_error(char* msg) {
64  char err_msg[128];
65  int buflen, msglen;
66
67  EXEC SQL WHENEVER SQLERROR CONTINUE;
68
69  printf("%s \n", msg);
70  buflen = sizeof(err_msg);
71  sqlglm(err_msg, &buflen, &msglen);
72  printf("%.*s \n", msglen, err_msg);
73  exit(1);
74}
75
76
77void connect_to_oracle() {
78  /* get your username/passwd from "user_pwd.txt" file */
79
80  FILE *in_file;
81  in_file = fopen("user_pwd.txt", "r");
82  fscanf(in_file, "%s", u_name);
83  fscanf(in_file, "%s", pwd);
84
85  strncpy((char *) username.arr, u_name, UNAME_LEN);
86  username.len = strlen((char *) username.arr);
87
88  strncpy((char *) password.arr, pwd, PWD_LEN);
89  password.len = strlen((char *) password.arr);
90
91  EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
92  EXEC SQL CONNECT :username IDENTIFIED BY :password;
93
94  printf("connected to oracle - \n");
95}