The facility that a disconnected RowSet
object calls on
to populate itself with rows of data. A reader (an object implementing the
RowSetReader
interface) may be registered with
a RowSet
object that supports the reader/writer paradigm.
When the RowSet
object's execute
method is
called, it in turn calls the reader's readData
method.
Public Method Summary
abstract void |
Public Methods
public abstract void readData (RowSetInternal caller)
Reads the new contents of the calling RowSet
object.
In order to call this method, a RowSet
object must have implemented the RowSetInternal
interface
and registered this RowSetReader
object as its reader.
The readData
method is invoked internally
by the RowSet.execute
method for rowsets that support the
reader/writer paradigm.
The readData
method adds rows to the caller.
It can be implemented in a wide variety of ways and can even
populate the caller with rows from a nonrelational data source.
In general, a reader may invoke any of the rowset's methods,
with one exception. Calling the method execute
will
cause an SQLException
to be thrown
because execute
may not be called recursively. Also,
when a reader invokes RowSet
methods, no listeners
are notified; that is, no RowSetEvent
objects are
generated and no RowSetListener
methods are invoked.
This is true because listeners are already being notified by the method
execute
.
Parameters
caller | the RowSet object (1) that has implemented the
RowSetInternal interface, (2) with which this reader is
registered, and (3) whose execute method called this reader |
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Throws
SQLException | if a database access error occurs or this method
invokes the RowSet.execute method
|
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