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From "Greg Reiser (JIRA)" <empire-db-...@incubator.apache.org>
Subject [jira] Created: (EMPIREDB-75) DBCommand should allow me to select duplicate columns
Date Tue, 30 Mar 2010 19:32:27 GMT
DBCommand should allow me to select duplicate columns
-----------------------------------------------------

                 Key: EMPIREDB-75
                 URL: https://issues.apache.org/jira/browse/EMPIREDB-75
             Project: Empire-DB
          Issue Type: Bug
          Components: Core
    Affects Versions: empire-db-2.0.5-incubating
         Environment: Win32, JDK1.6.0_15
            Reporter: Greg Reiser


Allowing the option to (explicitly) select a duplicate column in DBCommand would be helpful
for a UNION type of statement. Here is the scenario: I have enterprise educators that are
able to work within all colleges in a university while I have others that can only work in
specific colleges (specialized). Also, each educator can have an enterprise id and/or a facility-specific
ID. I need to be able to query the possible educators for a specific college. Here is my SQL:
SELECT t70.EDUCATOR_CODE, t69.EDUCATOR_ID, t69.EDUCATOR_SID
FROM EDUCATOR t69, EDUCATOR_FACILITY t70
WHERE t69.EDUCATOR_SID=t70.EDUCATOR_SID AND t69.STATUS=1 AND t70.FACILITY_SID=355 
UNION 
SELECT t69.EDUCATOR_ID, t69.EDUCATOR_ID, t69.EDUCATOR_SID
FROM EDUCATOR t69
WHERE t69.FACILITY_MAP_CODE=1 AND t69.STATUS=1

An overloaded select() method on DBCommand in my dev environment:
public void select(DBColumnExpr expr, boolean allowDuplicateColumns)
    { // Select this column
        if (select == null)
            select = new ArrayList<DBColumnExpr>();
        if (expr != null && allowDuplicateColumns ? true : (select.contains(expr)
== false))
            select.add(expr);
    }

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