Yurttas/PL/DBL/oracle/F/03/SPJ/q10.pc

 1/*  
 2REM
 3REM q10.pc
 4REM
 5REM Set the shipment quantity to zero for all shipments in 
 6REM 'Denver'.
 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 sn[4];
23  char pn[4];
24  char jn[4];
25  int quantity;
26} shipments;
27
28void connect_to_oracle();
29void sql_error();
30
31void main(int argc, char* argv[]) {
32  connect_to_oracle();
33
34  EXEC SQL
35    UPDATE Shipments
36    SET quantity = 0
37    WHERE sn IN (SELECT sn
38                 FROM Shipments
39                 WHERE quantity = 'Denver');
40
41  EXEC SQL DECLARE c CURSOR FOR
42    SELECT *
43    FROM Shipments;
44
45  EXEC SQL OPEN c;
46
47  EXEC SQL WHENEVER NOT FOUND DO BREAK;
48
49  printf("\nsn\tpn\tjn\tquantity\n");
50  for(;;) {
51    EXEC SQL FETCH c INTO :shipments;
52    printf("%s\t%s\t%s\t%d\n", shipments.sn,
53                               shipments.pn,
54                               shipments.jn,
55                               shipments.quantity);
56  }
57
58  EXEC SQL CLOSE c;
59
60  EXEC SQL COMMIT WORK RELEASE;
61
62  exit(0);
63}
64
65
66void sql_error(char* msg) {
67  char err_msg[128];
68  int buflen, msglen;
69
70  EXEC SQL WHENEVER SQLERROR CONTINUE;
71
72  printf("%s \n", msg);
73  buflen = sizeof(err_msg);
74  sqlglm(err_msg, &buflen, &msglen);
75  printf("%.*s \n", msglen, err_msg);
76  exit(1);
77}
78
79
80void connect_to_oracle() {
81  /* get your username/passwd from "user_pwd.txt" file */
82
83  FILE *in_file;
84  in_file = fopen("user_pwd.txt", "r");
85  fscanf(in_file, "%s", u_name);
86  fscanf(in_file, "%s", pwd);
87
88  strncpy((char *) username.arr, u_name, UNAME_LEN);
89  username.len = strlen((char *) username.arr);
90
91  strncpy((char *) password.arr, pwd, PWD_LEN);
92  password.len = strlen((char *) password.arr);
93
94  EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
95  EXEC SQL CONNECT :username IDENTIFIED BY :password;
96
97  printf("connected to oracle - \n");
98}