alexx726
JDeveloper тебя мало порадует (ты там столкнешься с удивительными интимными подробностями, первая из которых - выполнение select count(*) from <query> перед каждым заполнением набора данных). И, конечно, это - вещь в себе. Найти внятное описание работы этого самого ADF Swing крайне проблематично. То есть шаг влево вправо - расстрел (хотя это уж точно похоже на Forms)
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package my;
import oracle.jbo.server.ViewObjectImpl;
// ---------------------------------------------------------------------
// --- File generated by Oracle ADF Business Components Design Time.
// --- Custom code may be added to this class.
// --- Warning: Do not modify method signatures of generated methods.
// ---------------------------------------------------------------------
public class vTableImpl extends ViewObjectImpl {
/**This is the default constructor (do not remove)
*/
public vTableImpl() {
}
public long getEstimatedRowCount(){
//return super.getEstimatedRowCount();
return ( long ) 10000000 ;
}
}
public int getRowCount()
Counts the total number of rows in this row set. This method retrieves all rows from the View Object by executing the View Object's query and then calling next() until the last row is retrieved. Thus, since it iterates through the View Object one record at a time, this method may be slow. If you are working with a large number of rows, or if your application demands a fast response, use getEstimatedRowCount to obtain a quicker count. The following sample code uses getRowCount() to set up separate iterators for even numbered and odd numbered rows: // Default iterator gets even-numbered rows.
// Second iterator gets odd-numbered rows.
long nRows = vo.getRowCount();
String msg = "";
for (int i = 0; i < nRows; i +=2) {
// Get and set row index values relative to a range.
// Index of first row = 0.
vo.setCurrentRowAtRangeIndex(i);
Row currRow = vo.getCurrentRow();
msg = " Default iterator (even): " + vo.getRangeIndexOf(currRow);
printRow(currRow, msg);
secondIter.setCurrentRowAtRangeIndex(i + 1);
currRow = secondIter.getCurrentRow();
msg = " Second iterator (odd): " + vo.getRangeIndexOf(currRow);
printRow(secondIter.getCurrentRow(), msg);
}
Specified by:getRowCount in interface RowIteratorReturns:the number of rows in the row set.See Also:getEstimatedRowCount()
getEstimatedRowCount
public long getEstimatedRowCount()
Makes an estimated count of the rows in this row set. This method estimates the number of rows in the row count by calling getQueryHitCount (which performs a SELECT COUNT (*) FROM table). Internal logic in Business Components for Java keeps the EstimatedRowCount up-to-date as rows are inserted and removed. Thus, after the first call to this method, it can return the estimated count quickly. For example: // Get the rowcount again because of deleted or inserted row
rowCount = (int) iter.getRowSet().getEstimatedRowCount();
If you are working with a large number of rows, or if your application demands a fast response, use this method instead of getRowCount. Note however, that this method might not be as accurate as getRowCount(). To test whether the View Object has read all the rows from the cursor, you can use getEstimatedRowCount() in conjunction with getFetchedRowCount(). For example, getEstimatedRowCount() returns an equivalent of count(*) on the View Object. The getFetchedRowCount method returns the count of rows already fetched. If getFetchedRowCount() returns a value less than getEstimatedRowCount(), then the View Object has not read all rows from the cursor. Specified by:getEstimatedRowCount in interface RowSetReturns:an estimate of the number of rows in the row set.See Also:getQueryHitCount(ViewRowSetImpl), getFetchedRowCount()
