Yurttas/PL/DBL/oracle/F/03/Company-B/q16.pc

  1/*  
  2REM
  3REM q16.pc
  4REM
  5REM Give all managers a 10 percent raise unless the 
  6REM salary becomes greater than $100,000. In such cases,
  7REM give only a 3 percent raise.
  8REM
  9*/
 10
 11#include <stdio.h>
 12#include <sqlca.h>
 13
 14#define UNAME_LEN 32
 15#define PWD_LEN   16
 16
 17VARCHAR username[UNAME_LEN]; /* VARCHAR is an Oracle-supplied struct */
 18VARCHAR password[PWD_LEN];   /* varchar can be in lower case also. */
 19
 20char u_name[UNAME_LEN];
 21char pwd[PWD_LEN];
 22
 23struct {
 24  char employeename[16];
 25  char companyname[24];
 26  int salary;
 27} works;
 28
 29void connect_to_oracle();
 30void sql_error();
 31
 32void main(int argc, char* argv[]) {
 33  connect_to_oracle();
 34
 35  EXEC SQL
 36    UPDATE Works
 37    SET salary = salary * 1.03
 38    WHERE employeename IN (SELECT managername
 39                           FROM Manages)
 40      AND salary * 1.1 > 100000;
 41
 42  EXEC SQL
 43    UPDATE Works
 44    SET salary = salary * 1.1
 45    WHERE employeename IN (SELECT managername
 46                           FROM Manages)
 47      AND salary * 1.1 <= 100000;
 48
 49  EXEC SQL DECLARE c CURSOR FOR
 50    SELECT *
 51    FROM Works;
 52
 53  EXEC SQL OPEN c;
 54
 55  EXEC SQL WHENEVER NOT FOUND DO BREAK;
 56
 57  printf("\nemployeename\tcompanyname\tsalary\n");
 58  for(;;) {
 59    EXEC SQL FETCH c INTO :works;
 60    printf("%s\t%s\t%d\n", works.employeename,
 61                           works.companyname,
 62                           works.salary);
 63  }
 64
 65  EXEC SQL CLOSE c;
 66
 67  EXEC SQL COMMIT WORK RELEASE;
 68
 69  exit(0);
 70}
 71
 72
 73void sql_error(char* msg) {
 74  char err_msg[128];
 75  int buflen, msglen;
 76
 77  EXEC SQL WHENEVER SQLERROR CONTINUE;
 78
 79  printf("%s \n", msg);
 80  buflen = sizeof(err_msg);
 81  sqlglm(err_msg, &buflen, &msglen);
 82  printf("%.*s \n", msglen, err_msg);
 83  exit(1);
 84}
 85
 86
 87void connect_to_oracle() {
 88  /* get your username/passwd from "user_pwd.txt" file */
 89
 90  FILE *in_file;
 91  in_file = fopen("user_pwd.txt", "r");
 92  fscanf(in_file, "%s", u_name);
 93  fscanf(in_file, "%s", pwd);
 94
 95  strncpy((char *) username.arr, u_name, UNAME_LEN);
 96  username.len = strlen((char *) username.arr);
 97
 98  strncpy((char *) password.arr, pwd, PWD_LEN);
 99  password.len = strlen((char *) password.arr);
100
101  EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
102  EXEC SQL CONNECT :username IDENTIFIED BY :password;
103
104  printf("connected to oracle - \n");
105}