http://expert.csdn.net/Expert/topic/1066/1066231.xml?temp=.6182367
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#include <string.h>
#include <stdlib.h>
EXEC SQL BEGIN DECLARE SECTION; varchar username[20];
varchar password[20];
varchar db_string[20];EXEC SQL END DECLARE SECTION; EXEC SQL INCLUDE sqlca;
test()
{ strcpy((char *)username.arr,"DBKG");
username.len = (short) strlen((char *)username.arr);
strcpy((char *)password.arr,"NEC");
password.len = (short) strlen((char *)password.arr);
strcpy((char *)db_string.arr,"DBKG");
db_string.len = (short) strlen((char *)db_string.arr);
EXEC SQL CONNECT :username IDENTIFIED BY :password USING :db_string;
//printf("Connected to ORACLE user:%s\n",username.arr);
EXEC SQL COMMIT WORK RELEASE;
exit(0);}