1/*
2REM
3REM q08.pc
4REM
5REM Change the color of part 'P02' to 'Yellow',
6REM increase its weight by 5, and
7REM set its city to unknown('NULL').
8REM
9*/
10
11#include <stdio.h>
12#include <sqlca.h>
13
14#define UNAME_LEN 32
15#define PWD_LEN 16
16
17VARCHAR username[UNAME_LEN]; /* VARCHAR is an Oracle-supplied struct */
18VARCHAR password[PWD_LEN]; /* varchar can be in lower case also. */
19
20char u_name[UNAME_LEN];
21char pwd[PWD_LEN];
22
23struct {
24 char pn[4];
25 char pname[12];
26 char color[8];
27 int weight;
28 char city[16];
29} parts;
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 Parts
39 SET color='Yellow',
40 weight=weight+5,
41 city='NULL'
42 WHERE pn = 'P02';
43
44 EXEC SQL DECLARE c CURSOR FOR
45 SELECT *
46 FROM Parts;
47
48 EXEC SQL OPEN c;
49
50 EXEC SQL WHENEVER NOT FOUND DO BREAK;
51
52 printf("\npn\tpname\tcolor\tweight\tcity\n");
53 for(;;) {
54 EXEC SQL FETCH c INTO :parts;
55 printf("%s\t%s\t%s\t%d\t%s\n", parts.pn,
56 parts.pname,
57 parts.color,
58 parts.weight,
59 parts.city);
60 }
61
62 EXEC SQL CLOSE c;
63
64 EXEC SQL COMMIT WORK RELEASE;
65
66 exit(0);
67}
68
69
70void sql_error(char* msg) {
71 char err_msg[128];
72 int buflen, msglen;
73
74 EXEC SQL WHENEVER SQLERROR CONTINUE;
75
76 printf("%s \n", msg);
77 buflen = sizeof(err_msg);
78 sqlglm(err_msg, &buflen, &msglen);
79 printf("%.*s \n", msglen, err_msg);
80 exit(1);
81}
82
83
84void connect_to_oracle() {
85 /* get your username/passwd from "user_pwd.txt" file */
86
87 FILE *in_file;
88 in_file = fopen("user_pwd.txt", "r");
89 fscanf(in_file, "%s", u_name);
90 fscanf(in_file, "%s", pwd);
91
92 strncpy((char *) username.arr, u_name, UNAME_LEN);
93 username.len = strlen((char *) username.arr);
94
95 strncpy((char *) password.arr, pwd, PWD_LEN);
96 password.len = strlen((char *) password.arr);
97
98 EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
99 EXEC SQL CONNECT :username IDENTIFIED BY :password;
100
101 printf("connected to oracle - \n");
102}