Yurttas/PL/DBL/oracle/F/03/PC/q14.pc

  1/*  
  2REM
  3REM q14.pc
  4REM
  5REM For each laptop made by manufacturer 'E', add one inch to
  6REM screen size and subtract $100 from the price.
  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 model[6];
 24  int speed;
 25  int ram;
 26  float hd;
 27  float screen;
 28  int price;
 29} laptop;
 30
 31void connect_to_oracle();
 32void sql_error();
 33
 34void main(int argc, char* argv[]) {
 35  connect_to_oracle();
 36
 37  EXEC SQL
 38    UPDATE Laptop
 39    SET screen = screen + 1,
 40        price = price - 100
 41    WHERE model IN (SELECT L.model
 42                    FROM Product P, Laptop L
 43                    WHERE P.model=L.model
 44		      AND P.maker='E');
 45
 46  EXEC SQL DECLARE c CURSOR FOR
 47    SELECT *
 48    FROM Laptop;
 49
 50  EXEC SQL OPEN c;
 51
 52  EXEC SQL WHENEVER NOT FOUND DO BREAK;
 53
 54  printf("\nmodel\tspeed\tram\thd\tscreen\tprice\n");
 55  for(;;) {
 56    EXEC SQL FETCH c INTO :laptop;
 57    printf("%s\t%d\t%d\t%f\t%f\t%d\n", laptop.model,
 58                                       laptop.speed,
 59                                       laptop.ram,
 60                                       laptop.hd,
 61                                       laptop.screen,
 62                                       laptop.price);
 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}
106void main(int argc, char* argv[]) {
107  connect_to_oracle();
108
109  EXEC SQL
110    UPDATE Parts
111    SET color='Yellow',
112        weight=weight+5,
113        city='NULL'
114    WHERE pn = 'P02';
115
116  EXEC SQL DECLARE c CURSOR FOR
117    SELECT *
118    FROM Parts;
119
120  EXEC SQL OPEN c;
121
122  EXEC SQL WHENEVER NOT FOUND DO BREAK;
123
124  printf("\npn\tpname\tcolor\tweight\tcity\n");
125  for(;;) {
126    EXEC SQL FETCH c INTO :parts;
127    printf("%s\t%s\t%s\t%d\t%s\n", parts.pn,
128                                   parts.pname,
129                                   parts.color,
130                                   parts.weight,
131                                   parts.city);
132  }
133
134  EXEC SQL CLOSE c;
135
136  EXEC SQL COMMIT WORK RELEASE;
137
138  exit(0);
139}