Yurttas/PL/DBL/oracle/F/03/SPJ/q11.pc
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1/*
2REM
3REM q11.pc
4REM
5REM Delete all shipments with quantity greater than 300.
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 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 DELETE FROM Shipments
36 WHERE quantity > 300;
37
38 EXEC SQL DECLARE c CURSOR FOR
39 SELECT *
40 FROM Shipments;
41
42 EXEC SQL OPEN c;
43
44 EXEC SQL WHENEVER NOT FOUND DO BREAK;
45
46 printf("\nsn\tpn\tjn\tquantity\n");
47 for(;;) {
48 EXEC SQL FETCH c INTO :shipments;
49 printf("%s\t%s\t%s\t%d\n", shipments.sn,
50 shipments.pn,
51 shipments.jn,
52 shipments.quantity);
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}