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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Wt: Wt::Ext::DataStore Class Reference</title>
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<div class="navpath"><a class="el" href="namespaceWt.html">Wt</a>::<a class="el" href="namespaceWt_1_1Ext.html">Ext</a>::<a class="el" href="classWt_1_1Ext_1_1DataStore.html">DataStore</a>
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<div class="contents">
<h1>Wt::Ext::DataStore Class Reference<br>
<small>
[<a class="el" href="group__ext.html">Ext widgets</a>]</small>
</h1><!-- doxytag: class="Wt::Ext::DataStore" --><!-- doxytag: inherits="Wt::WResource" -->A resource that serializes data from a data model.
<a href="#_details">More...</a>
<p>
<code>#include <Wt/Ext/DataStore></code>
<p>
<div class="dynheader">
Inheritance diagram for Wt::Ext::DataStore:</div>
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<p><center><img src="classWt_1_1Ext_1_1DataStore__inherit__graph.png" border="0" usemap="#Wt_1_1Ext_1_1DataStore__inherit__map" alt="Inheritance graph"></center>
<map name="Wt_1_1Ext_1_1DataStore__inherit__map">
<area shape="rect" href="classWt_1_1WResource.html" title="An object which can be rendered in the HTTP protocol." alt="" coords="15,80,127,107"><area shape="rect" href="classWt_1_1WObject.html" title="A base class for objects that participate in the signal/slot system." alt="" coords="23,5,119,32"></map>
<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center></div>
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<a href="classWt_1_1Ext_1_1DataStore-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Ext_1_1DataStore.html#9d88086e22ca1f48b8378494fe9222f9">DataStore</a> (<a class="el" href="classWt_1_1WAbstractItemModel.html">WAbstractItemModel</a> *model, <a class="el" href="group__ext.html#g5bc908c6e6aa90646cca1276d68cb2b2">DataLocation</a> dataLocation, <a class="el" href="classWt_1_1WObject.html">WObject</a> *parent=0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Create a new data store. <a href="#9d88086e22ca1f48b8378494fe9222f9"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="4b2c3c030c6557aa6e3beadb50bf1643"></a><!-- doxytag: member="Wt::Ext::DataStore::~DataStore" ref="4b2c3c030c6557aa6e3beadb50bf1643" args="()" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Ext_1_1DataStore.html#4b2c3c030c6557aa6e3beadb50bf1643">~DataStore</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Ext_1_1DataStore.html#6fbd9be0f07bc864bc2921769d64a51e">addColumn</a> (int columnIndex, const std::string &jsonName)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Add a column to the list of columns to be serialized. <a href="#6fbd9be0f07bc864bc2921769d64a51e"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Ext_1_1DataStore.html#d4e923221657f57281d76c02b3a4d803">setFilterColumn</a> (int columnIndex)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the column which is used to handle filter requests. <a href="#d4e923221657f57281d76c02b3a4d803"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Ext_1_1DataStore.html#95828fc3362ef58ff821790180bf9834">handleRequest</a> (const <a class="el" href="classWt_1_1Http_1_1Request.html">Http::Request</a> &request, <a class="el" href="classWt_1_1Http_1_1Response.html">Http::Response</a> &response)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Handles a request. <a href="#95828fc3362ef58ff821790180bf9834"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
A resource that serializes data from a data model.
<p>
An instance of this class is used by <a class="el" href="classWt_1_1Ext_1_1ComboBox.html" title="A widget that provides a drop-down combo-box control.">ComboBox</a> and <a class="el" href="classWt_1_1Ext_1_1TableView.html" title="A widget that displays data in a table.">TableView</a> widgets to serialize data from a <a class="el" href="classWt_1_1WAbstractItemModel.html" title="An abstract model for use with Wt's view classes.">WAbstractItemModel</a>. The data store can serialize data both for a ClientSide or ServerSide location of the data. When the location is ServerSide, the model supports transmission of certain data pages, and filtering of the model.<p>
To use the data store, you need to specify which columns from the model need to be serialized. <hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="9d88086e22ca1f48b8378494fe9222f9"></a><!-- doxytag: member="Wt::Ext::DataStore::DataStore" ref="9d88086e22ca1f48b8378494fe9222f9" args="(WAbstractItemModel *model, DataLocation dataLocation, WObject *parent=0)" -->
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<td class="memname">Wt::Ext::DataStore::DataStore </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classWt_1_1WAbstractItemModel.html">WAbstractItemModel</a> * </td>
<td class="paramname"> <em>model</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__ext.html#g5bc908c6e6aa90646cca1276d68cb2b2">DataLocation</a> </td>
<td class="paramname"> <em>dataLocation</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classWt_1_1WObject.html">WObject</a> * </td>
<td class="paramname"> <em>parent</em> = <code>0</code></td><td> </td>
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<td>)</td>
<td></td><td></td><td></td>
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<p>
Create a new data store.
<p>
Data will be fecthed from <em>model</em>.
</div>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="6fbd9be0f07bc864bc2921769d64a51e"></a><!-- doxytag: member="Wt::Ext::DataStore::addColumn" ref="6fbd9be0f07bc864bc2921769d64a51e" args="(int columnIndex, const std::string &jsonName)" -->
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<td class="memname">void Wt::Ext::DataStore::addColumn </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"> <em>columnIndex</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const std::string & </td>
<td class="paramname"> <em>jsonName</em></td><td> </td>
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<td></td>
<td>)</td>
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<p>
Add a column to the list of columns to be serialized.
<p>
The column <em>columnIndex</em> of the model is added to the current list of columns that are serialized. The <em>jsonName</em> provides the column label that is transmitted.
</div>
</div><p>
<a class="anchor" name="d4e923221657f57281d76c02b3a4d803"></a><!-- doxytag: member="Wt::Ext::DataStore::setFilterColumn" ref="d4e923221657f57281d76c02b3a4d803" args="(int columnIndex)" -->
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<td class="memname">void Wt::Ext::DataStore::setFilterColumn </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"> <em>columnIndex</em> </td>
<td> ) </td>
<td></td>
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<div class="memdoc">
<p>
Set the column which is used to handle filter requests.
<p>
A request for filtering data will be done by matching the given filter against data in the model at column <em>columnIndex</em>.
</div>
</div><p>
<a class="anchor" name="95828fc3362ef58ff821790180bf9834"></a><!-- doxytag: member="Wt::Ext::DataStore::handleRequest" ref="95828fc3362ef58ff821790180bf9834" args="(const Http::Request &request, Http::Response &response)" -->
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<td class="memname">void Wt::Ext::DataStore::handleRequest </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classWt_1_1Http_1_1Request.html">Http::Request</a> & </td>
<td class="paramname"> <em>request</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classWt_1_1Http_1_1Response.html">Http::Response</a> & </td>
<td class="paramname"> <em>response</em></td><td> </td>
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<td>)</td>
<td></td><td></td><td><code> [protected, virtual]</code></td>
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<p>
Handles a request.
<p>
Reimplement this method so that a proper response is generated for the given request. From the <code>request</code> object you can access request parameters and whether the request is a continuation request. In the <code>response</code> object, you should set the mime type and stream the output data.<p>
A request may also concern a continuation, indicated in <a class="el" href="classWt_1_1Http_1_1Request.html#2d4f88961a222be846460a8238823ae0" title="Returns a continuation object.">Http::Request::continuation()</a>, in which case the next part for a previously created continuation should be served.<p>
While handling a request, which may happen at any time together with event handling, the library makes sure that the resource is not being concurrently deleted, but multiple requests may happend simultaneously for a single resource.
<p>Implements <a class="el" href="classWt_1_1WResource.html#3a740f8cc29e2e6e4e58defc9c88b8b6">Wt::WResource</a>.</p>
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