org.apache.commons.beanutils

Class RowSetDynaClass

Implemented Interfaces:
DynaClass, Serializable

public class RowSetDynaClass
extends JDBCDynaClass
implements DynaClass, Serializable

Implementation of DynaClass that creates an in-memory collection of DynaBeans representing the results of an SQL query. Once the DynaClass instance has been created, the JDBC ResultSet and Statement on which it is based can be closed, and the underlying Connection can be returned to its connection pool (if you are using one).

The normal usage pattern is something like:

   Connection conn = ...;  // Acquire connection from pool
   Statement stmt = conn.createStatement();
   ResultSet rs = stmt.executeQuery("SELECT ...");
   RowSetDynaClass rsdc = new RowSetDynaClass(rs);
   rs.close();
   stmt.close();
   ...;                    // Return connection to pool
   List rows = rsdc.getRows();
   ...;                   // Process the rows as desired
 

Each column in the result set will be represented as a DynaBean property of the corresponding name (optionally forced to lower case for portability). There will be one DynaBean in the List returned by getRows() for each row in the original ResultSet.

In general, instances of RowSetDynaClass can be serialized and deserialized, which will automatically include the list of DynaBeans representing the data content. The only exception to this rule would be when the underlying property values that were copied from the ResultSet originally cannot themselves be serialized. Therefore, a RowSetDynaClass makes a very convenient mechanism for transporting data sets to remote Java-based application components.

Version:
$Revision: 1.9 $ $Date: 2004/02/28 13:18:34 $
Author:
Craig R. McClanahan

Field Summary

protected int
limit
Limits the size of the returned list.
protected List
rows
The list of DynaBeans representing the contents of the original ResultSet on which this RowSetDynaClass was based.

Fields inherited from class org.apache.commons.beanutils.JDBCDynaClass

lowerCase, properties, propertiesMap

Constructor Summary

RowSetDynaClass(ResultSet resultSet)
Construct a new RowSetDynaClass for the specified ResultSet.
RowSetDynaClass(ResultSet resultSet, boolean lowerCase)
Construct a new RowSetDynaClass for the specified ResultSet.
RowSetDynaClass(ResultSet resultSet, boolean lowerCase, int limit)
Construct a new RowSetDynaClass for the specified ResultSet.
RowSetDynaClass(ResultSet resultSet, int limit)
Construct a new RowSetDynaClass for the specified ResultSet.

Method Summary

protected void
copy(ResultSet resultSet)
Copy the column values for each row in the specified ResultSet into a newly created DynaBean, and add this bean to the list of DynaBeans that will later by returned by a call to getRows().
protected DynaBean
createDynaBean()
Create and return a new DynaBean instance to be used for representing a row in the underlying result set.
List
getRows()
Return a List containing the DynaBeans that represent the contents of each Row from the ResultSet that was the basis of this RowSetDynaClass instance.

Methods inherited from class org.apache.commons.beanutils.JDBCDynaClass

createDynaProperty, getDynaProperties, getDynaProperty, getName, introspect, loadClass, newInstance

Field Details

limit

protected int limit
Limits the size of the returned list. The call to getRows() will return at most limit number of rows. If less than or equal to 0, does not limit the size of the result.

rows

protected List rows
The list of DynaBeans representing the contents of the original ResultSet on which this RowSetDynaClass was based.

Constructor Details

RowSetDynaClass

public RowSetDynaClass(ResultSet resultSet)
            throws SQLException
Construct a new RowSetDynaClass for the specified ResultSet. The property names corresponding to column names in the result set will be lower cased.
Parameters:
resultSet - The result set to be wrapped

RowSetDynaClass

public RowSetDynaClass(ResultSet resultSet,
                       boolean lowerCase)
            throws SQLException
Construct a new RowSetDynaClass for the specified ResultSet. The property names corresponding to the column names in the result set will be lower cased or not, depending on the specified lowerCase value. If limit is not less than 0, max limit number of rows will be copied into the resultset.
Parameters:
resultSet - The result set to be wrapped
lowerCase - Should property names be lower cased?

RowSetDynaClass

public RowSetDynaClass(ResultSet resultSet,
                       boolean lowerCase,
                       int limit)
            throws SQLException
Construct a new RowSetDynaClass for the specified ResultSet. The property names corresponding to the column names in the result set will be lower cased or not, depending on the specified lowerCase value.

WARNING - If you specify false for lowerCase, the returned property names will exactly match the column names returned by your JDBC driver. Because different drivers might return column names in different cases, the property names seen by your application will vary depending on which JDBC driver you are using.

Parameters:
resultSet - The result set to be wrapped
lowerCase - Should property names be lower cased?

RowSetDynaClass

public RowSetDynaClass(ResultSet resultSet,
                       int limit)
            throws SQLException
Construct a new RowSetDynaClass for the specified ResultSet. The property names corresponding to column names in the result set will be lower cased. If limit is not less than 0, max limit number of rows will be copied into the list.
Parameters:
resultSet - The result set to be wrapped
limit - The maximum for the size of the result.

Method Details

copy

protected void copy(ResultSet resultSet)
            throws SQLException
Copy the column values for each row in the specified ResultSet into a newly created DynaBean, and add this bean to the list of DynaBeans that will later by returned by a call to getRows().
Parameters:
resultSet - The ResultSet whose data is to be copied

createDynaBean

protected DynaBean createDynaBean()
Create and return a new DynaBean instance to be used for representing a row in the underlying result set.

getRows

public List getRows()
Return a List containing the DynaBeans that represent the contents of each Row from the ResultSet that was the basis of this RowSetDynaClass instance. These DynaBeans are disconnected from the database itself, so there is no problem with modifying the contents of the list, or the values of the properties of these DynaBeans. However, it is the application's responsibility to persist any such changes back to the database, if it so desires.

Copyright (c) 2001-2004 - Apache Software Foundation