Yurttas/PL/DBL/oracle/F/03/SPJ/q13.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 q13.pc REM REM Delete all projects for which there are no projects. REM: #include <stdio.h> #include ...")
1/*
2REM
3REM q13.pc
4REM
5REM Delete all projects for which there are no projects.
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 jn[4];
23 char jname[12];
24 char city[16];
25} projects;
26
27void connect_to_oracle();
28void sql_error();
29
30void main(int argc, char* argv[]) {
31 connect_to_oracle();
32
33 EXEC SQL
34 DELETE FROM Projects
35 WHERE JN NOT IN (SELECT JN
36 FROM Projects);
37
38 EXEC SQL DECLARE c CURSOR FOR
39 SELECT *
40 FROM Projects;
41
42 EXEC SQL OPEN c;
43
44 EXEC SQL WHENEVER NOT FOUND DO BREAK;
45
46 printf("\njn\tjname\tcity\n");
47 for(;;) {
48 EXEC SQL FETCH c INTO :projects;
49 printf("%s\t%s\t%s\n", projects.jn,
50 projects.jname,
51 projects.city);
52 }
53
54 EXEC SQL CLOSE c;
55
56 EXEC SQL COMMIT WORK RELEASE;
57
58 exit(0);
59}
60
61
62void sql_error(char* msg) {
63 char err_msg[128];
64 int buflen, msglen;
65
66 EXEC SQL WHENEVER SQLERROR CONTINUE;
67
68 printf("%s \n", msg);
69 buflen = sizeof(err_msg);
70 sqlglm(err_msg, &buflen, &msglen);
71 printf("%.*s \n", msglen, err_msg);
72 exit(1);
73}
74
75
76void connect_to_oracle() {
77 /* get your username/passwd from "user_pwd.txt" file */
78
79 FILE *in_file;
80 in_file = fopen("user_pwd.txt", "r");
81 fscanf(in_file, "%s", u_name);
82 fscanf(in_file, "%s", pwd);
83
84 strncpy((char *) username.arr, u_name, UNAME_LEN);
85 username.len = strlen((char *) username.arr);
86
87 strncpy((char *) password.arr, pwd, PWD_LEN);
88 password.len = strlen((char *) password.arr);
89
90 EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
91 EXEC SQL CONNECT :username IDENTIFIED BY :password;
92
93 printf("connected to oracle - \n");
94}