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RowSetReader
public
interface
RowSetReader
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.
Summary
Public methods |
|---|
abstract
void
|
readData(RowSetInternal caller)
Reads the new contents of the calling RowSet object.
|
Public methods
readData
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 |
RowSetInternal: 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 |
| Throws |
|---|
SQLException |
if a database access error occurs or this method
invokes the RowSet.execute method |
Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
Last updated 2025-02-10 UTC.
[null,null,["Last updated 2025-02-10 UTC."],[],[],null,["# RowSetReader\n\nAdded in [API level 1](/guide/topics/manifest/uses-sdk-element#ApiLevels) \n\nRowSetReader\n============\n\n\n`\npublic\n\n\ninterface\nRowSetReader\n`\n\n\n`\n\n\n`\n\n|------------------------|\n| javax.sql.RowSetReader |\n\n\u003cbr /\u003e\n\n*** ** * ** ***\n\nThe facility that a disconnected `RowSet` object calls on\nto populate itself with rows of data. A reader (an object implementing the\n`RowSetReader` interface) may be registered with\na `RowSet` object that supports the reader/writer paradigm.\nWhen the `RowSet` object's `execute` method is\ncalled, it in turn calls the reader's `readData` method.\n\nSummary\n-------\n\n| ### Public methods ||\n|------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| ` abstract void` | ` `[readData](/reference/javax/sql/RowSetReader#readData(javax.sql.RowSetInternal))`(`[RowSetInternal](/reference/javax/sql/RowSetInternal)` caller) ` Reads the new contents of the calling `RowSet` object. |\n\nPublic methods\n--------------\n\n### readData\n\nAdded in [API level 1](/guide/topics/manifest/uses-sdk-element#ApiLevels) \n\n```\npublic abstract void readData (RowSetInternal caller)\n```\n\nReads the new contents of the calling `RowSet` object.\nIn order to call this method, a `RowSet`\nobject must have implemented the `RowSetInternal` interface\nand registered this `RowSetReader` object as its reader.\nThe `readData` method is invoked internally\nby the `RowSet.execute` method for rowsets that support the\nreader/writer paradigm.\n\nThe `readData` method adds rows to the caller.\nIt can be implemented in a wide variety of ways and can even\npopulate the caller with rows from a nonrelational data source.\nIn general, a reader may invoke any of the rowset's methods,\nwith one exception. Calling the method `execute` will\ncause an `SQLException` to be thrown\nbecause `execute` may not be called recursively. Also,\nwhen a reader invokes `RowSet` methods, no listeners\nare notified; that is, no `RowSetEvent` objects are\ngenerated and no `RowSetListener` methods are invoked.\nThis is true because listeners are already being notified by the method\n`execute`.\n\n\u003cbr /\u003e\n\n| Parameters ||\n|----------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `caller` | `RowSetInternal`: 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 \u003cbr /\u003e |\n\n| Throws ||\n|--------------------------------------------------|--------------------------------------------------------------------------------------|\n| [SQLException](/reference/java/sql/SQLException) | if a database access error occurs or this method invokes the `RowSet.execute` method |"]]
