PRO*C에서 MULTIPLE CONNECTION 방법

Question

제품 : PRECOMPILERS
작성날짜 : 1997-02-04
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Pro*C에서 Multiple Connection 방법
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1. Explicit Connection
EXEC SQL DECLARE database_name DATABASE;
EXEC SQL CONNECT :username IDENTIFIED BY :password
AT database_name USING :database_string;
. database_name : Precompiler에서의 identifier
. database_string : remote node에 접속하는 SQL*Net syntax
1) SQL Operation
EXEC SQL AT database_name SELECT ...
EXEC SQL AT database_name INSERT ...
EXEC SQL AT database_name UPDATE ...
EXEC SQL AT database_name COMMIT ...
2) PL/SQL Block
EXEC SQL AT database_name EXECUTE
begin
/* PL/SQL block here */
end;
END-EXEC;
3) Cursor Control
EXEC SQL AT database_name DECLARE cursor_name CURSOR FOR ...
EXEC SQL OPEN cursor_name ...
DECALRE문장에만 AT database_name이 들어가며 OPEN, FETCH,
CLOSE문에서는 AT 문을 사용하지 않는다.
4) Dynamic SQL
Dynamic Method 1에서는 execute시점에 At문을 사용한다.
EXEC SQL AT database_name EXECUTE IMMEDIATE :sql_stmt;
Dynamic Method 2,3,4에서는 DECLARE STATEMENT에서만 AT문을
사용한다.
EXEC SQL AT database_name DECLARE sql_stmt STATEMENT;
EXEC SQL PREPARE sql_stmt FROM :sql_string;
* host variable로 선언하여 사용할 수도 있다.
char username[10] = "scott";
char password[10] = "tiger";
char db_name[10] = "oracle1";
char db_string[20] = "NYNON";
EXEC SQL CONNECT :username IDENTIFIED BY :password
AT :db_name USING :db_string;
EXEC SQL AT :db_name DELETE ...
- DECLARE DATABASE 문이 필요하지 않으나 SQL Operation시에
사용되는 table들에 대해서 DECLARE TABLE 문을 사용해야
precompile시에 warning을 발생시키지 않는다.
2. Implicit Connection
database link를 사용하여 non-default database를 access한다.
EXEC SQL SELECT ENAME,JOB INTO :emp_name, :job_title
FROM emp@db_link
(database link는 미리 create 되어 있어야 한다.
CREATE DATABASE LINK db_link
CONNECT TO scott IDENTIFIED BY tiger
USING 'T:krhost:SID'; )
이것은 v1 방법이고 , v2 에서는 tnsnames.ora file 의 alias 를 ' ' 안에 써준다.

Answer 1

Hi @seperiz
Have you tried rebooting your router? try unplugging it for 10 seconds, akkow it 2-3 minutes to start till you able to access the web and then turn the printer off and on again.
May you see any difference then?
If the same persists, how far the printer is located from your router? I suggest ensuring it is not too far, but not too close either... 203 meters away would be an optimal distance.
Hope that may help.
Shlomi 
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