Yurttas/PL/DBL/oracle/F/03/SPJ/q09.pc
Revision as of 00:06, 5 November 2013 by MassBot1 (talk | contribs) (Created page with "<syntaxhighlight lang="text" line start="1" enclose="div">ββREM REM q09.pc REM REM Double the status of all suppliers in 'Houston'. REM: #include <stdio.h> #include <sql...")
1/*
2REM
3REM q09.pc
4REM
5REM Double the status of all suppliers in 'Houston'.
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 sname[12];
24 int status,
25 char city[16];
26} suppliers;
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 Suppliers
36 SET status = status*2
37 WHERE city = 'Houston';
38
39 EXEC SQL DECLARE c CURSOR FOR
40 SELECT *
41 FROM Suppliers;
42
43 EXEC SQL OPEN c;
44
45 EXEC SQL WHENEVER NOT FOUND DO BREAK;
46
47 printf("\nsn\tsname\tstatus\tcity\n");
48 for(;;) {
49 EXEC SQL FETCH c INTO :suppliers;
50 printf("%s\t%s\t%d\t%s\n", suppliers.sn,
51 suppliers.sname,
52 suppliers.status,
53 suppliers.city);
54 }
55
56 EXEC SQL CLOSE c;
57
58 EXEC SQL COMMIT WORK RELEASE;
59
60 exit(0);
61}
62
63
64void sql_error(char* msg) {
65 char err_msg[128];
66 int buflen, msglen;
67
68 EXEC SQL WHENEVER SQLERROR CONTINUE;
69
70 printf("%s \n", msg);
71 buflen = sizeof(err_msg);
72 sqlglm(err_msg, &buflen, &msglen);
73 printf("%.*s \n", msglen, err_msg);
74 exit(1);
75}
76
77
78void connect_to_oracle() {
79 /* get your username/passwd from "user_pwd.txt" file */
80
81 FILE *in_file;
82 in_file = fopen("user_pwd.txt", "r");
83 fscanf(in_file, "%s", u_name);
84 fscanf(in_file, "%s", pwd);
85
86 strncpy((char *) username.arr, u_name, UNAME_LEN);
87 username.len = strlen((char *) username.arr);
88
89 strncpy((char *) password.arr, pwd, PWD_LEN);
90 password.len = strlen((char *) password.arr);
91
92 EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
93 EXEC SQL CONNECT :username IDENTIFIED BY :password;
94
95 printf("connected to oracle - \n");
96}