@Override
public void printSQLSelectStatement(
DatabaseCall call, ExpressionSQLPrinter printer, SQLSelectStatement statement) {
int max = 0;
int firstRow = 0;
ReadQuery query = statement.getQuery();
if (query != null) {
max = query.getMaxRows();
firstRow = query.getFirstResult();
}
if (max <= 0 && firstRow <= 0) {
// neither max nor firstRow is set
super.printSQLSelectStatement(call, printer, statement);
return;
}
if (max <= 0) {
// if max row is not set use MAX_VALUE instead
// this is done, because NewDB does not allow
// OFFSET without LIMIT, and scrollable cursor is not supported
// in order to support firstRows without MaxRows also MaxRow has to be set
// this limits also the size of the result set in this case to Integer.MAX_VALUE rows
query.setMaxRows(Integer.MAX_VALUE);
}
statement.setUseUniqueFieldAliases(true);
call.setFields(statement.printSQL(printer));
printer.printString(" LIMIT ");
printer.printParameter(DatabaseCall.MAXROW_FIELD);
printer.printString(" OFFSET ");
printer.printParameter(DatabaseCall.FIRSTRESULT_FIELD);
call.setIgnoreFirstRowSetting(true);
call.setIgnoreMaxResultsSetting(true);
}
/**
* INTERNAL: Get the ref for the object. This is required for use by Refs, there might be a better
* way to do it when objID are supported. (i.e. getting it from the object or identity map).
*/
public Ref getRef(Object object, AbstractSession session) {
SQLSelectStatement statement = new SQLSelectStatement();
statement.addTable(getTables().firstElement()); // Assumed only one for obj-rel descriptors.
statement
.getFields()
.addElement(new org.eclipse.persistence.expressions.ExpressionBuilder().ref());
statement.setWhereClause(
getObjectBuilder().buildPrimaryKeyExpressionFromObject(object, session));
statement.setRequiresAliases(true);
statement.normalize(session, this);
ValueReadQuery valueQuery = new ValueReadQuery();
valueQuery.setSQLStatement(statement);
valueQuery.prepareCall(session, new DatabaseRecord());
// Must return unwrapped Ref on WLS.
valueQuery.getCall().setIsNativeConnectionRequired(true);
Ref ref = (Ref) session.executeQuery(valueQuery);
return ref;
}
