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