org.apache.commons.beanutils
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 $
Field Summary | |
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protected int | limit Limits the size of the returned list. |
protected List | rows The list of DynaBeans representing the contents of
the original |
Constructor Summary | |
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RowSetDynaClass(ResultSet resultSet) Construct a new RowSetDynaClass for the specified
| |
RowSetDynaClass(ResultSet resultSet, int limit) Construct a new RowSetDynaClass for the specified
| |
RowSetDynaClass(ResultSet resultSet, boolean lowerCase) Construct a new RowSetDynaClass for the specified
| |
RowSetDynaClass(ResultSet resultSet, boolean lowerCase, int limit) Construct a new RowSetDynaClass for the specified
|
Method Summary | |
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protected void | copy(ResultSet resultSet) |
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 |
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.
The list of DynaBeans representing the contents of
the original ResultSet
on which this
RowSetDynaClass was based.
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
Throws: NullPointerException if resultSet
is null
SQLException if the metadata for this result set
cannot be introspected
Construct a new RowSetDynaClass for the specified
ResultSet
. The property names corresponding
to column names in the result set will be lower cased.
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.
Throws: NullPointerException if resultSet
is null
SQLException if the metadata for this result set
cannot be introspected
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.
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?
Throws: NullPointerException if resultSet
is null
SQLException if the metadata for this result set
cannot be introspected
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?
Throws: NullPointerException if resultSet
is null
SQLException if the metadata for this result set
cannot be introspected
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
Throws: SQLException if an error is encountered copying the data
Create and return a new DynaBean instance to be used for representing a row in the underlying result set.
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.