void updateDs(DSDataSourceProxy out) throws DataStoreException, java.sql.SQLException, Exception {
int rowNo = -1;
DataStoreRow row = new DataStoreRow(this, null, _desc);
// do deletes
for (rowNo = 0; rowNo < _deletedRows.size(); rowNo++) {
row.setDSDataRow((DSDataRow) _deletedRows.elementAt(rowNo));
((DSDataRow) _deletedRows.elementAt(rowNo)).setProxyRow(rowNo);
if (!out.deleteRow(this, row)) throw new Exception("$Delete$");
}
// do the updates
for (rowNo = 0; rowNo < _rows.size(); rowNo++) {
row.setDSDataRow((DSDataRow) _rows.elementAt(rowNo));
((DSDataRow) _rows.elementAt(rowNo)).setProxyRow(rowNo);
if (row.getDSDataRow().getRowStatus() == STATUS_MODIFIED) {
if (!out.updateRow(this, row)) throw new Exception("$Update$");
}
}
// do the inserts
for (rowNo = 0; rowNo < _rows.size(); rowNo++) {
row.setDSDataRow((DSDataRow) _rows.elementAt(rowNo));
((DSDataRow) _rows.elementAt(rowNo)).setProxyRow(rowNo);
if (row.getDSDataRow().getRowStatus() == STATUS_NEW_MODIFIED) {
if (!out.insertRow(this, row)) throw new Exception("$Insert$");
}
}
}
/**
* The run method for the thread that retrieves the data from the database. This method should not
* be called directly. Instead use the retrieve method.
*/
public void run() {
try {
DataStoreRow row = new DataStoreRow(this, new DSDataRow(_desc), _desc);
while (_dataSource.retrieveRow(this, row)) {
_rows.addElement(row.getDSDataRow());
if (_threaded) notifyListeners(ModelChangedEvent.TYPE_ROW_INSERTED_OR_DELETED);
if (!_retrieveInProgress || (_maxRows > -1 && _rows.size() >= _maxRows)) {
_cancelInProgress = true;
_retrieveInProgress = false;
interruptWaitingRetrieveThreads();
break;
}
if (_threaded) Thread.yield();
row.setDSDataRow(new DSDataRow(_desc));
}
_dataSource.postRetrieve(this);
_cancelInProgress = false;
interruptWaitingCancelThreads();
notifyListeners(ModelChangedEvent.TYPE_DATA_LOADED);
} catch (Exception e) {
System.out.println("DataStore.run:" + e);
_cancelInProgress = false;
interruptWaitingCancelThreads();
}
_retrieveInProgress = false;
interruptWaitingRetrieveThreads();
_cancelInProgress = false;
interruptWaitingCancelThreads();
}
private synchronized void retrieve(String criteria, boolean countOnly) throws DataStoreException {
if (!countOnly) reset();
waitForCancel(); // just in case there was already a retrieve running wait for it to be
// cancelled before continuing
_retrieveInProgress = true;
try {
_dataSource.preRetrieve(this, criteria, countOnly);
} catch (Exception e) {
try {
_dataSource.postRetrieve(this);
} catch (java.sql.SQLException ex) {
throw new DataStoreException(ex.toString(), ex);
} catch (Exception ex) {
throw new DataStoreException(ex.toString());
}
_retrieveInProgress = false;
interruptWaitingRetrieveThreads();
throw new DataStoreException(e.toString(), e);
}
if (!countOnly) {
if (_threaded) {
Thread t = new Thread(this);
t.start();
} else run();
}
}
/**
* Returns a list of column definitions for a particular table in the database that the datastore
* is using. Note, the datastore must have an app name for this method to work.
*/
public ColumnDefinition[] getColumnsForTable(String table) {
try {
return _dataSource.getColumnsForTable(this, table);
} catch (Exception ex) {
return null;
}
}
/**
* Updates multiple proxy data stores in a single transaction
*
* @param ds The Array of DataStores to update
* @throws DataStoreException
*/
public static void update(DataStoreProxy[] ds) throws DataStoreException {
int i = 0;
DSDataSourceProxy out = ds[0].getDataSourceProxy();
try {
out.preUpdate(ds[0]);
for (i = 0; i < ds.length; i++) {
out.writeDSHeader(ds[i]);
ds[i].setRemoteUpdateReturnValue(null);
ds[i].updateDs(out);
}
out.commit(ds[0]);
out.postUpdate(ds, true);
for (i = 0; i < ds.length; i++) ds[i].resetStatus();
} catch (DataStoreException e) {
try {
out.postUpdate(ds, false);
} catch (Exception ex) {
System.err.println("DataStoreProxy.update() -- postUpdate:" + ex);
}
throw (e);
} catch (Exception e) {
try {
out.postUpdate(ds, false);
} catch (Exception ex) {
System.err.println("DataStoreProxy.update() -- postUpdate:" + ex);
}
String message = e.getMessage();
if (message.equals("$Update$") || message.equals("$Insert$") || message.equals("$Delete$")) {
throw new DataStoreException("DataStore updated canceled.");
} else throw new DataStoreException(e.toString());
}
}
/**
* This method will cause the database to reflect the changes made in the data store's buffer.
*
* @exception com.salmonllc.sql.DataStoreException If a SQLError occurs while the datastore is
* updating.
*/
public void update() throws DataStoreException {
waitForRetrieve();
DSDataSourceProxy out = _dataSource;
_updateResults = null;
DataStoreProxy[] proxy = {this};
try {
out.preUpdate(this);
out.writeDSHeader(this);
updateDs(out);
out.commit(this);
out.postUpdate(proxy, true);
resetStatus();
notifyListeners(ModelChangedEvent.TYPE_DATA_LOADED);
} catch (DataStoreException e) {
try {
out.postUpdate(proxy, false);
} catch (Exception ex) {
System.err.println("DataStoreProxy.update() -- postUpdate:" + ex);
}
throw (e);
} catch (Exception e) {
try {
out.postUpdate(proxy, false);
} catch (Exception ex) {
System.err.println("DataStoreProxy.update() -- postUpdate:" + ex);
}
String message = e.getMessage();
if (message.equals("$Update$") || message.equals("$Insert$") || message.equals("$Delete$")) {
throw new DataStoreException("DataStore updated canceled.");
} else throw new DataStoreException(e.toString());
}
}
/**
* Use this method to get the amount of rows that will be retrieved when a data store retrieve is
* executed.
*
* @param criteria The selection criteria to use for the select.
*/
public int estimateRowsRetrieved(String criteria) throws DataStoreException {
try {
retrieve(criteria, true);
} catch (DataStoreException e) {
throw e;
}
_retrieveInProgress = false;
interruptWaitingRetrieveThreads();
return _dataSource.getCount();
}
/** If a retrieve is in progress, this method will cancel it. */
public void cancelRetrieve() {
if (_retrieveInProgress) {
try {
_dataSource.cancelRetrieve(this);
} catch (Exception e) {
System.out.println("DataStoreProxy.cancelRetrieve" + e);
}
_retrieveInProgress = false;
interruptWaitingRetrieveThreads();
}
}
/**
* This method will ping the server for this particular data store. Pinging from time to time will
* prevent the server session from expiring.
*
* @return true if the ping succeeds and false if not.
*/
public boolean ping() throws Exception {
return _dataSource.ping(this);
}
/**
* This method will destroy the remote data store on the data server. All resources on the server
* will be reclaimed.
*/
public void destroy() throws Exception {
_dataSource.destroy(this);
}
