how to confirm the context has been initialized .

From: liujd <liujd_at_cti.ac.cn>
Date: Tue, 25 Mar 2003 22:53:44 -0800
Message-ID: <F001.00572D20.20030325225344@fatcity.com>

i write two function .
one is login function as login(char * password,int contextId).this function initialize the context environment .and login database. two is getGroupInfo(char * groupName,int contextId); this function is as his name to get one group information.And refer to ctx[contextId] in the login function initial
the sql_context variable is declared in the *.h as following EXEC SQL BEGIN DECLARE SECTION;
        sql_context ctx[20];
EXEC SQL END DECLARE SECTION;
Now ,my question is in the function two( getGroupInfo() ) ,how to judge the ctx[contextId] has been initialized before used it?

thanks in advance!

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Author: liujd
  INET: liujd_at_cti.ac.cn

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