JavaTM 2 Platform
Standard Ed. 5.0
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|CachedRowSet||The interface that all standard implementations of
|FilteredRowSet||The standard interface that all standard implementations of
|JdbcRowSet||The standard interface that all standard implementations of
|Predicate||The standard interface that provides the framework for all
|WebRowSet||The standard interface that all implementations of a
|BaseRowSet||An abstract class providing a
|RowSetMetaDataImpl||Provides implementations for the methods that set and get
metadata information about a
|RowSetWarning||An extension of
Standard interfaces and base classes for JDBC
implementations. This package contains interfaces and classes
that a standard
RowSet implementation either implements or extends.
RowSetinterfaces. All five extend the RowSet interface described in the JDBC 3.0 specification. It is anticipated that additional definitions of more specialized JDBC
RowSettypes will emerge as this technology matures. Future definitions should be specified as subinterfaces using inheritance similar to the way it is used in this specification.
Note: The interface definitions provided in this package form the basis for
all compliant JDBC
RowSet implementations. Vendors and more advanced
developers who intend to provide their own compliant
should pay particular attention to the assertions detailed in specification
JdbcRowSet- A wrapper around a ResultSet object that makes it possible to use the result set as a JavaBeansTM component. Thus, a JdbcRowSet object can be a Bean that any tool makes available for assembling an application as part of a component based architecture . A JdbcRowSet object is a connected
RowSetobject, that is, it must continually maintain its connection to its data source using a JDBC technology-enabled driver ("JDBC driver"). In addition, a
JdbcRowSetobject provides a fully updatable and scrollable tabular data structure as defined in the JDBC 3.0 specification.
CachedRowSetTM> - A CachedRowSet object is a JavaBeansTM component that is scrollable, updatable, serializable, and generally disconnected from the source of its data. A CachedRowSet object typically contains rows from a result set, but it can also contain rows from any file with a tabular format, such as a spreadsheet. CachedRowSet implementations must use the SyncFactory to manage and obtain pluggable
SyncProviderobjects to provide synchronization between the disconnected
RowSetobject and the originating data source. Typically a
SyncProviderimplementation relies upon a JDBC driver to obtain connectivity to a particular data source. Further details on this mechanism are discussed in the
WebRowSetobject is an extension of CachedRowSet that can read and write a
RowSetobject in a well formed XML format. This class calls an
XmlReaderobject (an extension of the
RowSetReaderinterface) to read a rowset in XML format. It calls an
XmlWriterobject (an extension of the
RowSetWriterinterface) to write a rowset in XML format. The reader and writer required by
WebRowSetobjects are provided by the
SyncFactoryin the form of
SyncProviderimplementations. In order to ensure well formed XML usage, a standard generic XML Schema is defined and published at
FilteredRowSet- A FilteredRowSet object provides filtering functionality in a programmatic and extensible way. There are many instances when a RowSet
objecthas a need to provide filtering in its contents without sacrificing the disconnected environment, thus saving the expense of having to create a connection to the data source. Solutions to this need vary from providing heavyweight full scale SQL query abilities, to portable components, to more lightweight approaches. A
FilteredRowSetobject consumes an implementation of the
Predicateinterface, which may define a filter at run time. In turn, a
FilteredRowSetobject is tasked with enforcing the set filter for both inbound and outbound read and write operations. That is, all filters can be considered as bi-directional. No standard filters are defined; however, sufficient mechanics are specified to permit any required filter to be implemented.
JoinRowSet- The JoinRowSet interface describes a mechanism by which relationships can be established between two or more standard
RowSetimplementations. Any number of RowSet objects can be added to a JoinRowSet object provided the RowSetobjects can be related in a SQL JOIN like fashion. By definition, the SQL JOIN statement is used to combine the data contained in two (or more) relational database tables based upon a common attribute. By establishing and then enforcing column matches, a JoinRowSet object establishes relationships between RowSet instances without the need to touch the originating data source.
RowSetImplementations must follow the assertions described in this specification. In accordance with the terms of the Java Community Process, a Test Compatibility Kit (TCK) can be licensed to ensure compatibility with the specification. The following paragraphs outline a number of starting points for implementers of the standard JDBC
RowSetdefinitions. Implementers should also consult the Implementer's Guide in the javax.sql.rowset.spi package for guidelines on
A compliant JDBC
RowSet implementation must implement one or more
standard interfaces specified in this package and and may extend the
BaseRowSet abstract class. For example, a
CachedRowSet implementation must implement the
interface and extend the
BaseRowSet abstract class. The
BaseRowSet class provides the standard architecture on which all
RowSet implementations should be built, regardless of whether the
RowSet objects exist in a connected or disconnected environment.
The BaseRowSet abstract class provides any RowSet implementation
with its base functionality, including property manipulation and event notification
that is fully compliant with JavaBeans
component requirements. As an example, all implementations provided in the
reference implementations (contained in the com.sun.rowset package) use
the BaseRowSet class as a basis for their implementations.
The following table illustrates the features that the
abstract class provides.
Provides standard JavaBeans property manipulation mechanisms to allow applications to get and set
RowSetcommand and property values. Refer to the documentation of the javax.sql.RowSet interface (available in the JDBC 3.0 specification) for more details on the standard
Provides standard JavaBeans event notifications to registered event listeners. Refer to the documentation of javax.sql.RowSetEvent interface (available in the JDBC 3.0 specification) for more details on how to register and handle standard RowSet events generated by compliant implementations.
Setters for a RowSet object's command
Provides a complete set of setter methods for setting RowSet command parameters.
Provides fields for storing of stream instances in addition to providing a set of constants for stream type designation.
JdbcRowSet describes a
RowSet object that must always
be connected to the originating data source. Implementations of the
should ensure that this connection is provided solely by a JDBC driver.
RowSet objects that are implementations of the
JdbcRowSet interface and are therefore operating in a connected environment
do not use the
SyncFactory to obtain a
RowSetWriter object. They can safely rely on the JDBC driver to
supply their needs by virtue of the presence of an underlying updatable and scrollable
RowSet object, such as a
connection management to a
SyncProvider object provided by the
SyncFactory. To ensure fully disconnected semantics, all
RowSet objects must ensure
that the original connection made to the data source to populate the
object is closed to permit the garbage collector to recover and release resources. The
SyncProvider object ensures that the critical JDBC properties are
maintained in order to re-establish a connection to the data source when a
synchronization is required. A disconnected
RowSet object should
therefore ensure that no
extraneous references remain on the
RowsetMetaDataImpl class is a utility class that provides an implementation of the
RowSetMetaData interface, supplying standard setter
method implementations for metadata for both connected and disconnected
RowSet objects. All implementations are free to use this standard
implementation but are not required to do so.
RowSetWarning class provides warnings that can be set
Similar to SQLWarning objects,
RowSetWarning objects are silently chained to the object whose method
caused the warning to be thrown. All
RowSet implementations should
ensure that this chaining occurs if a warning is generated and also ensure that the
warnings are available via the
getRowSetWarnings method defined in either
JdbcRowSet interface or the
After a warning has been retrieved with one of the
getRowSetWarnings methods, the
getNextWarning can be called on it to retrieve any warnings that might
be chained on it. If a warning is returned,
getNextWarning can be called
on it, and so on until there are no more warnings.
Joinable interface provides both connected and disconnected
RowSet objects with the capability to be added to a
JoinRowSet object in an SQL
RowSet object that has implemented the
interface can set a match column, retrieve a match column, or unset a match column.
JoinRowSet object can then use the
match column as a basis for adding the
JavaTM 2 Platform
Standard Ed. 5.0
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Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.