Clean up DRDA classes handling of OPNQRY options

The follow is a list of changes to be implemented in the DRDAConnThread, DRDAStatement and DRDAResultSet. It is hoped that these changes will clean up code related to DERBY-213 and make the fix easier to implement.

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Step 1:

In org.apache.derby.impl.drda.DRDAResultSet add
public static final int QRYCLSIMP_DEFAULT = CodePoint.QRYCLSIMP_NO;

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Step 2:

Copy the org.apache.derby.impl.drda.DRDAStatement.setOPNQRYOptions() method to the org.apache.derby.impl.drda.DRDAResultSet class and
change the logic of set setOPNQRYOptions() to remove the setting of the qryclsimp value to QRYCLSIMP_SERVER_CHOICE. Only the values of YES or NO will ever be stored internally.

e.g.

DRDAResultSet.setOPNQRYOptions(int blksize, int qryblkctl, int maxblkext, int outovropt, int qryrowset,
int qryclsimpl) {
this.blksize = blksize;
setQryprctyp(qryblkctl);
this.maxblkext = maxblkext;
this.outovropt = outovropt;
this.qryrowset = qryrowset;
this.qryclsimp = (qryclsimpl == CodePoint.QRYCLSIMP_SERVER_CHOICE)
? DRDAResultSet.QRYCLSIMP_DEFAULT : qryclsimpl;
}

Thereafter change to the DRDAStatement.setOPNQRYOptions() to a delegation method which calls the method in DRDAResultSet

e.g.

DRDAStatement.setOPNQRYOptions(int blksize, int qryblkctl, int maxblkext, int outovropt,int qryrowset,int qryclsimpl)
{
currentDrdaRs.setOPNQRYOptions(blksize, qryblkctl, maxblkext,
outovropt, qryrowset, qryclsimpl);
}

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Step 3:

Add org.apache.derby.impl.drda.DRDAResultSet.isRSCloseImplicit() which will test to see if the resultset should close implicitly

e.g.

boolean DRDAResultSet.isRSCloseImplicit() {
return currentDrdaRs.qryclsimp == CodePoint.QRYCLSIMP_YES &&
stmt.getQryprctyp() != CodePoint.LMTBLKPRC
}

Then add a corresponding delegation method in org.apache.derby.impl.drda.DRDAStatement()

boolean DRDAStatement.isRSCloseImplicit() {
return currentDrdaRs.isRSCloseImplicit();
}

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Step 4:

Remove org.apache.derby.impl.drda.DRDAStatment.setQryclsimp(int value)

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Step 5:

Remove all references to
if (qryclsimp == CodePoint.QRYCLSIMP_YES &&
stmt.getQryprctyp() != CodePoint.LMTBLKPRC) { ...
logic and replace with
if (drdaStatement.isRSCloseImplicit()) { ...

This should remove all references to org.apache.derby.impl.drda.DRDAStatment.getQryclsimp() which can in turn be removed.

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Step 6:

In org.apache.derby.drda.impl.DRDAResultSet change:

protected int qryclsimp
to
private int qryclsimp;

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Step 7:

In org.apache.derby.drda.impl.DRDAConnThread.parseOPNQRY() change the line
int qryclsimp = CodePoint.QRYCLSIMP_DEFAULT;
to
int qryclsimp = DRDAResultSet.QRYCLSIMP_DEFAULT

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Step 8:

In org.apache.derby.drda.impl.CodePoint remove
static final int QRYCLSIMP_DEFAULT = QRYCLSIMP_SERVER_CHOICE;

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Step 9: Insure that the new methods and changed methods have appropriate java documentation.

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Step 10: Organize the import for the DRDAConnThread, DRDAStatement and DRDAResultSet classes found in the org.apache.derby.drda.impl package.