Example usage for javax.sql.rowset CachedRowSet nextPage

Introduction

In this page you can find the example usage for javax.sql.rowset CachedRowSet nextPage.

Prototype

public boolean nextPage() throws SQLException;

Source Link

Document

Increments the current page of the CachedRowSet.

Usage

From source file:com.oracle.tutorial.jdbc.CachedRowSetSample.java

public void testPaging() throws SQLException, MalformedURLException {

    CachedRowSet crs = null;
    this.con.setAutoCommit(false);

    try {/*w  w w  . j av  a 2  s .co m*/

        crs = new CachedRowSetImpl();
        crs.setUsername(settings.userName);
        crs.setPassword(settings.password);

        if (this.dbms.equals("mysql")) {
            crs.setUrl(settings.urlString + "?relaxAutoCommit=true");
        } else {
            crs.setUrl(settings.urlString);
        }
        crs.setCommand("select * from MERCH_INVENTORY");

        // Setting the page size to 4, such that we
        // get the data in chunks of 4 rows @ a time.
        crs.setPageSize(100);

        // Now get the first set of data
        crs.execute();

        crs.addRowSetListener(new ExampleRowSetListener());

        // Keep on getting data in chunks until done.

        int i = 1;
        do {
            System.out.println("Page number: " + i);
            while (crs.next()) {
                System.out.println("Found item " + crs.getInt("ITEM_ID") + ": " + crs.getString("ITEM_NAME"));
                if (crs.getInt("ITEM_ID") == 1235) {
                    int currentQuantity = crs.getInt("QUAN") + 1;
                    System.out.println("Updating quantity to " + currentQuantity);
                    crs.updateInt("QUAN", currentQuantity + 1);
                    crs.updateRow();
                    // Syncing the row back to the DB
                    crs.acceptChanges(con);
                }

            } // End of inner while
            i++;
        } while (crs.nextPage());
        // End of outer while

        // Inserting a new row
        // Doing a previous page to come back to the last page
        // as we ll be after the last page.

        int newItemId = 123456;

        if (this.doesItemIdExist(newItemId)) {
            System.out.println("Item ID " + newItemId + " already exists");
        } else {
            crs.previousPage();
            crs.moveToInsertRow();
            crs.updateInt("ITEM_ID", newItemId);
            crs.updateString("ITEM_NAME", "TableCloth");
            crs.updateInt("SUP_ID", 927);
            crs.updateInt("QUAN", 14);
            Calendar timeStamp;
            timeStamp = new GregorianCalendar();
            timeStamp.set(2006, 4, 1);
            crs.updateTimestamp("DATE_VAL", new Timestamp(timeStamp.getTimeInMillis()));
            crs.insertRow();
            crs.moveToCurrentRow();

            // Syncing the new row back to the database.
            System.out.println("About to add a new row...");
            crs.acceptChanges(con);
            System.out.println("Added a row...");
            this.viewTable(con);
        }
    } catch (SyncProviderException spe) {

        SyncResolver resolver = spe.getSyncResolver();

        Object crsValue; // value in the RowSet object
        Object resolverValue; // value in the SyncResolver object
        Object resolvedValue; // value to be persisted

        while (resolver.nextConflict()) {

            if (resolver.getStatus() == SyncResolver.INSERT_ROW_CONFLICT) {
                int row = resolver.getRow();
                crs.absolute(row);

                int colCount = crs.getMetaData().getColumnCount();
                for (int j = 1; j <= colCount; j++) {
                    if (resolver.getConflictValue(j) != null) {
                        crsValue = crs.getObject(j);
                        resolverValue = resolver.getConflictValue(j);

                        // Compare crsValue and resolverValue to determine
                        // which should be the resolved value (the value to persist)
                        //
                        // This example choses the value in the RowSet object,
                        // crsValue, to persist.,

                        resolvedValue = crsValue;

                        resolver.setResolvedValue(j, resolvedValue);
                    }
                }
            }
        }
    } catch (SQLException sqle) {
        JDBCTutorialUtilities.printSQLException(sqle);
    } finally {
        if (crs != null)
            crs.close();
        this.con.setAutoCommit(true);
    }

}

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