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package javax.sql.rowset;
import java.sql.*;
import javax.sql.*;
import javax.naming.*;
import java.io.*;
import java.math.*;
import java.io.*;
The standard interface that all standard implementations of
JdbcRowSet must implement.
1.0 Overview
A wrapper around a ResultSet object that makes it possible
to use the result set as a JavaBeans™
component. Thus, a JdbcRowSet object can be one of the Beans that
a tool makes available for composing an application. Because
a JdbcRowSet is a connected rowset, that is, it continually
maintains its connection to a database using a JDBC technology-enabled
driver, it also effectively makes the driver a JavaBeans component.
Because it is always connected to its database, an instance of
JdbcRowSet
can simply take calls invoked on it and in turn call them on its
ResultSet object. As a consequence, a result set can, for
example, be a component in a Swing application.
Another advantage of a JdbcRowSet object is that it can be
used to make a ResultSet object scrollable and updatable. All
RowSet objects are by default scrollable and updatable. If
the driver and database being used do not support scrolling and/or updating
of result sets, an application can populate a JdbcRowSet object
with the data of a ResultSet object and then operate on the
JdbcRowSet object as if it were the ResultSet
object.
2.0 Creating a JdbcRowSet Object
The reference implementation of the JdbcRowSet interface,
JdbcRowSetImpl, provides an implementation of
the default constructor. A new instance is initialized with
default values, which can be set with new values as needed. A
new instance is not really functional until its execute
method is called. In general, this method does the following:
- establishes a connection with a database
- creates a
PreparedStatement object and sets any of its
placeholder parameters
- executes the statement to create a
ResultSet object
If the execute method is successful, it will set the
appropriate private JdbcRowSet fields with the following:
- a
Connection object -- the connection between the rowset
and the database
- a
PreparedStatement object -- the query that produces
the result set
- a
ResultSet object -- the result set that the rowset's
command produced and that is being made, in effect, a JavaBeans
component
If these fields have not been set, meaning that the execute
method has not executed successfully, no methods other than
execute and close may be called on the
rowset. All other public methods will throw an exception.
Before calling the execute method, however, the command
and properties needed for establishing a connection must be set.
The following code fragment creates a JdbcRowSetImpl object,
sets the command and connection properties, sets the placeholder parameter,
and then invokes the method execute.
JdbcRowSetImpl jrs = new JdbcRowSetImpl();
jrs.setCommand("SELECT * FROM TITLES WHERE TYPE = ?");
jrs.setURL("jdbc:myDriver:myAttribute");
jrs.setUsername("cervantes");
jrs.setPassword("sancho");
jrs.setString(1, "BIOGRAPHY");
jrs.execute();
The variable jrs now represents an instance of
JdbcRowSetImpl that is a thin wrapper around the
ResultSet object containing all the rows in the
table TITLES where the type of book is biography.
At this point, operations called on jrs will
affect the rows in the result set, which is effectively a JavaBeans
component.
The implementation of the RowSet method execute in the
JdbcRowSet reference implementation differs from that in the
CachedRowSet™
reference implementation to account for the different
requirements of connected and disconnected RowSet objects.
Author: Jonathan Bruce Since: 1.5
/**
* The standard interface that all standard implementations of
* <code>JdbcRowSet</code> must implement.
*
* <h3>1.0 Overview</h3>
* A wrapper around a <code>ResultSet</code> object that makes it possible
* to use the result set as a JavaBeans™
* component. Thus, a <code>JdbcRowSet</code> object can be one of the Beans that
* a tool makes available for composing an application. Because
* a <code>JdbcRowSet</code> is a connected rowset, that is, it continually
* maintains its connection to a database using a JDBC technology-enabled
* driver, it also effectively makes the driver a JavaBeans component.
* <P>
* Because it is always connected to its database, an instance of
* <code>JdbcRowSet</code>
* can simply take calls invoked on it and in turn call them on its
* <code>ResultSet</code> object. As a consequence, a result set can, for
* example, be a component in a Swing application.
* <P>
* Another advantage of a <code>JdbcRowSet</code> object is that it can be
* used to make a <code>ResultSet</code> object scrollable and updatable. All
* <code>RowSet</code> objects are by default scrollable and updatable. If
* the driver and database being used do not support scrolling and/or updating
* of result sets, an application can populate a <code>JdbcRowSet</code> object
* with the data of a <code>ResultSet</code> object and then operate on the
* <code>JdbcRowSet</code> object as if it were the <code>ResultSet</code>
* object.
*
* <h3>2.0 Creating a <code>JdbcRowSet</code> Object</h3>
* The reference implementation of the <code>JdbcRowSet</code> interface,
* <code>JdbcRowSetImpl</code>, provides an implementation of
* the default constructor. A new instance is initialized with
* default values, which can be set with new values as needed. A
* new instance is not really functional until its <code>execute</code>
* method is called. In general, this method does the following:
* <UL>
* <LI> establishes a connection with a database
* <LI> creates a <code>PreparedStatement</code> object and sets any of its
* placeholder parameters
* <LI> executes the statement to create a <code>ResultSet</code> object
* </UL>
* If the <code>execute</code> method is successful, it will set the
* appropriate private <code>JdbcRowSet</code> fields with the following:
* <UL>
* <LI> a <code>Connection</code> object -- the connection between the rowset
* and the database
* <LI> a <code>PreparedStatement</code> object -- the query that produces
* the result set
* <LI> a <code>ResultSet</code> object -- the result set that the rowset's
* command produced and that is being made, in effect, a JavaBeans
* component
* </UL>
* If these fields have not been set, meaning that the <code>execute</code>
* method has not executed successfully, no methods other than
* <code>execute</code> and <code>close</code> may be called on the
* rowset. All other public methods will throw an exception.
* <P>
* Before calling the <code>execute</code> method, however, the command
* and properties needed for establishing a connection must be set.
* The following code fragment creates a <code>JdbcRowSetImpl</code> object,
* sets the command and connection properties, sets the placeholder parameter,
* and then invokes the method <code>execute</code>.
* <PRE>
* JdbcRowSetImpl jrs = new JdbcRowSetImpl();
* jrs.setCommand("SELECT * FROM TITLES WHERE TYPE = ?");
* jrs.setURL("jdbc:myDriver:myAttribute");
* jrs.setUsername("cervantes");
* jrs.setPassword("sancho");
* jrs.setString(1, "BIOGRAPHY");
* jrs.execute();
* </PRE>
* The variable <code>jrs</code> now represents an instance of
* <code>JdbcRowSetImpl</code> that is a thin wrapper around the
* <code>ResultSet</code> object containing all the rows in the
* table <code>TITLES</code> where the type of book is biography.
* At this point, operations called on <code>jrs</code> will
* affect the rows in the result set, which is effectively a JavaBeans
* component.
* <P>
* The implementation of the <code>RowSet</code> method <code>execute</code> in the
* <code>JdbcRowSet</code> reference implementation differs from that in the
* <code>CachedRowSet</code>™
* reference implementation to account for the different
* requirements of connected and disconnected <code>RowSet</code> objects.
*
* @author Jonathan Bruce
* @since 1.5
*/
public interface JdbcRowSet extends RowSet, Joinable {
Retrieves a boolean indicating whether rows marked
for deletion appear in the set of current rows. If true is
returned, deleted rows are visible with the current rows. If
false is returned, rows are not visible with the set of
current rows. The default value is false.
Standard rowset implementations may choose to restrict this behavior
for security considerations or for certain deployment
scenarios. The visibility of deleted rows is implementation-defined
and does not represent standard behavior.
Note: Allowing deleted rows to remain visible complicates the behavior
of some standard JDBC RowSet implementations methods.
However, most rowset users can simply ignore this extra detail because
only very specialized applications will likely want to take advantage of
this feature.
Throws: - SQLException – if a rowset implementation is unable to
to determine whether rows marked for deletion remain visible
See Also: Returns: true if deleted rows are visible;
false otherwise
/**
* Retrieves a <code>boolean</code> indicating whether rows marked
* for deletion appear in the set of current rows. If <code>true</code> is
* returned, deleted rows are visible with the current rows. If
* <code>false</code> is returned, rows are not visible with the set of
* current rows. The default value is <code>false</code>.
* <P>
* Standard rowset implementations may choose to restrict this behavior
* for security considerations or for certain deployment
* scenarios. The visibility of deleted rows is implementation-defined
* and does not represent standard behavior.
* <P>
* Note: Allowing deleted rows to remain visible complicates the behavior
* of some standard JDBC <code>RowSet</code> implementations methods.
* However, most rowset users can simply ignore this extra detail because
* only very specialized applications will likely want to take advantage of
* this feature.
*
* @return <code>true</code> if deleted rows are visible;
* <code>false</code> otherwise
* @exception SQLException if a rowset implementation is unable to
* to determine whether rows marked for deletion remain visible
* @see #setShowDeleted
*/
public boolean getShowDeleted() throws SQLException;
Sets the property showDeleted to the given
boolean value. This property determines whether
rows marked for deletion continue to appear in the set of current rows.
If the value is set to true, deleted rows are immediately
visible with the set of current rows. If the value is set to
false, the deleted rows are set as invisible with the
current set of rows.
Standard rowset implementations may choose to restrict this behavior
for security considerations or for certain deployment
scenarios. This is left as implementation-defined and does not
represent standard behavior.
Params: - b –
true if deleted rows should be shown;
false otherwise
Throws: - SQLException – if a rowset implementation is unable to
to reset whether deleted rows should be visible
See Also:
/**
* Sets the property <code>showDeleted</code> to the given
* <code>boolean</code> value. This property determines whether
* rows marked for deletion continue to appear in the set of current rows.
* If the value is set to <code>true</code>, deleted rows are immediately
* visible with the set of current rows. If the value is set to
* <code>false</code>, the deleted rows are set as invisible with the
* current set of rows.
* <P>
* Standard rowset implementations may choose to restrict this behavior
* for security considerations or for certain deployment
* scenarios. This is left as implementation-defined and does not
* represent standard behavior.
*
* @param b <code>true</code> if deleted rows should be shown;
* <code>false</code> otherwise
* @exception SQLException if a rowset implementation is unable to
* to reset whether deleted rows should be visible
* @see #getShowDeleted
*/
public void setShowDeleted(boolean b) throws SQLException;
Retrieves the first warning reported by calls on this JdbcRowSet
object.
If a second warning was reported on this JdbcRowSet object,
it will be chained to the first warning and can be retrieved by
calling the method RowSetWarning.getNextWarning on the
first warning. Subsequent warnings on this JdbcRowSet
object will be chained to the RowSetWarning objects
returned by the method RowSetWarning.getNextWarning.
The warning chain is automatically cleared each time a new row is read.
This method may not be called on a RowSet object
that has been closed;
doing so will cause an SQLException to be thrown.
Because it is always connected to its data source, a JdbcRowSet
object can rely on the presence of active
Statement, Connection, and ResultSet
instances. This means that applications can obtain additional
SQLWarning
notifications by calling the getNextWarning methods that
they provide.
Disconnected Rowset objects, such as a
CachedRowSet object, do not have access to
these getNextWarning methods.
Throws: - SQLException – if this method is called on a closed
JdbcRowSet object
See Also: Returns: the first RowSetWarning
object reported on this JdbcRowSet object
or null if there are none
/**
* Retrieves the first warning reported by calls on this <code>JdbcRowSet</code>
* object.
* If a second warning was reported on this <code>JdbcRowSet</code> object,
* it will be chained to the first warning and can be retrieved by
* calling the method <code>RowSetWarning.getNextWarning</code> on the
* first warning. Subsequent warnings on this <code>JdbcRowSet</code>
* object will be chained to the <code>RowSetWarning</code> objects
* returned by the method <code>RowSetWarning.getNextWarning</code>.
*
* The warning chain is automatically cleared each time a new row is read.
* This method may not be called on a <code>RowSet</code> object
* that has been closed;
* doing so will cause an <code>SQLException</code> to be thrown.
* <P>
* Because it is always connected to its data source, a <code>JdbcRowSet</code>
* object can rely on the presence of active
* <code>Statement</code>, <code>Connection</code>, and <code>ResultSet</code>
* instances. This means that applications can obtain additional
* <code>SQLWarning</code>
* notifications by calling the <code>getNextWarning</code> methods that
* they provide.
* Disconnected <code>Rowset</code> objects, such as a
* <code>CachedRowSet</code> object, do not have access to
* these <code>getNextWarning</code> methods.
*
* @return the first <code>RowSetWarning</code>
* object reported on this <code>JdbcRowSet</code> object
* or <code>null</code> if there are none
* @throws SQLException if this method is called on a closed
* <code>JdbcRowSet</code> object
* @see RowSetWarning
*/
public RowSetWarning getRowSetWarnings() throws SQLException;
Each JdbcRowSet contains a Connection object from
the ResultSet or JDBC properties passed to it's constructors.
This method wraps the Connection commit method to allow flexible
auto commit or non auto commit transactional control support.
Makes all changes made since the previous commit/rollback permanent
and releases any database locks currently held by this Connection
object. This method should be used only when auto-commit mode has
been disabled.
Throws: - SQLException – if a database access error occurs or this
Connection object within this
JdbcRowSet is in auto-commit mode
See Also:
/**
* Each <code>JdbcRowSet</code> contains a <code>Connection</code> object from
* the <code>ResultSet</code> or JDBC properties passed to it's constructors.
* This method wraps the <code>Connection</code> commit method to allow flexible
* auto commit or non auto commit transactional control support.
* <p>
* Makes all changes made since the previous commit/rollback permanent
* and releases any database locks currently held by this Connection
* object. This method should be used only when auto-commit mode has
* been disabled.
*
* @throws SQLException if a database access error occurs or this
* Connection object within this <code>JdbcRowSet</code> is in auto-commit mode
* @see java.sql.Connection#setAutoCommit
*/
public void commit() throws SQLException;
Each JdbcRowSet contains a Connection object from
the original ResultSet or JDBC properties passed to it. This
method wraps the Connection's getAutoCommit method
to allow an application to determine the JdbcRowSet transaction
behavior.
Sets this connection's auto-commit mode to the given state. If a
connection is in auto-commit mode, then all its SQL statements will
be executed and committed as individual transactions. Otherwise, its
SQL statements are grouped into transactions that are terminated by a
call to either the method commit or the method rollback. By default,
new connections are in auto-commit mode.
Throws: - SQLException – if a database access error occurs
See Also: Returns: true if auto-commit is enabled; false otherwise
/**
* Each <code>JdbcRowSet</code> contains a <code>Connection</code> object from
* the original <code>ResultSet</code> or JDBC properties passed to it. This
* method wraps the <code>Connection</code>'s <code>getAutoCommit</code> method
* to allow an application to determine the <code>JdbcRowSet</code> transaction
* behavior.
* <p>
* Sets this connection's auto-commit mode to the given state. If a
* connection is in auto-commit mode, then all its SQL statements will
* be executed and committed as individual transactions. Otherwise, its
* SQL statements are grouped into transactions that are terminated by a
* call to either the method commit or the method rollback. By default,
* new connections are in auto-commit mode.
*
* @return {@code true} if auto-commit is enabled; {@code false} otherwise
* @throws SQLException if a database access error occurs
* @see java.sql.Connection#getAutoCommit()
*/
public boolean getAutoCommit() throws SQLException;
Each JdbcRowSet contains a Connection object from
the original ResultSet or JDBC properties passed to it. This
method wraps the Connection's getAutoCommit method
to allow an application to set the JdbcRowSet transaction behavior.
Sets the current auto-commit mode for this Connection object.
Params: - autoCommit –
true to enable auto-commit; false to disable auto-commit
Throws: - SQLException – if a database access error occurs
See Also:
/**
* Each <code>JdbcRowSet</code> contains a <code>Connection</code> object from
* the original <code>ResultSet</code> or JDBC properties passed to it. This
* method wraps the <code>Connection</code>'s <code>getAutoCommit</code> method
* to allow an application to set the <code>JdbcRowSet</code> transaction behavior.
* <p>
* Sets the current auto-commit mode for this <code>Connection</code> object.
* @param autoCommit {@code true} to enable auto-commit; {@code false} to
* disable auto-commit
* @throws SQLException if a database access error occurs
* @see java.sql.Connection#setAutoCommit(boolean)
*/
public void setAutoCommit(boolean autoCommit) throws SQLException;
Each JdbcRowSet contains a Connection object from
the original ResultSet or JDBC properties passed to it.
Undoes all changes made in the current transaction and releases any
database locks currently held by this Connection object. This method
should be used only when auto-commit mode has been disabled.
Throws: - SQLException – if a database access error occurs or this
Connection
object within this JdbcRowSet is in auto-commit mode.
See Also:
/**
* Each <code>JdbcRowSet</code> contains a <code>Connection</code> object from
* the original <code>ResultSet</code> or JDBC properties passed to it.
* Undoes all changes made in the current transaction and releases any
* database locks currently held by this <code>Connection</code> object. This method
* should be used only when auto-commit mode has been disabled.
*
* @throws SQLException if a database access error occurs or this <code>Connection</code>
* object within this <code>JdbcRowSet</code> is in auto-commit mode.
* @see #rollback(Savepoint)
*/
public void rollback() throws SQLException;
Each JdbcRowSet contains a Connection object from
the original ResultSet or JDBC properties passed to it.
Undoes all changes made in the current transaction to the last set savepoint
and releases any database locks currently held by this Connection
object. This method should be used only when auto-commit mode has been disabled.
Params: - s – The
Savepoint to rollback to
Throws: - SQLException – if a database access error occurs or this
Connection
object within this JdbcRowSet is in auto-commit mode.
See Also:
/**
* Each <code>JdbcRowSet</code> contains a <code>Connection</code> object from
* the original <code>ResultSet</code> or JDBC properties passed to it.
* Undoes all changes made in the current transaction to the last set savepoint
* and releases any database locks currently held by this <code>Connection</code>
* object. This method should be used only when auto-commit mode has been disabled.
* @param s The {@code Savepoint} to rollback to
* @throws SQLException if a database access error occurs or this <code>Connection</code>
* object within this <code>JdbcRowSet</code> is in auto-commit mode.
* @see #rollback
*/
public void rollback(Savepoint s) throws SQLException;
}