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<div class="title">Wt::Dbo::query_result_traits&lt; Result &gt; Class Template Reference<div class="ingroups"><a class="el" href="group__dbo.html">Database Objects (Wt::Dbo)</a></div></div>  </div>
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<!-- doxytag: class="Wt::Dbo::query_result_traits" -->
<p>Traits class for result types.  
 <a href="structWt_1_1Dbo_1_1query__result__traits.html#details">More...</a></p>

<p><code>#include &lt;Wt/Dbo/SqlTraits&gt;</code></p>

<p><a href="classWt_1_1Dbo_1_1query__result__traits-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-static-methods"></a>
Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html#a15021d5b70cb03ee08b39f0c45b02572">getFields</a> (<a class="el" href="classWt_1_1Dbo_1_1Session.html">Session</a> &amp;session, std::vector&lt; std::string &gt; *aliases, std::vector&lt; <a class="el" href="classWt_1_1Dbo_1_1FieldInfo.html">FieldInfo</a> &gt; &amp;result)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Obtains the list of fields in this result.  <a href="#a15021d5b70cb03ee08b39f0c45b02572"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static Result&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html#a24228c4fbd6fd851a44c7aaf3416d0b3">load</a> (<a class="el" href="classWt_1_1Dbo_1_1Session.html">Session</a> &amp;session, <a class="el" href="classWt_1_1Dbo_1_1SqlStatement.html">SqlStatement</a> &amp;statement, int &amp;column)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Reads a result from an executed query.  <a href="#a24228c4fbd6fd851a44c7aaf3416d0b3"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html#a62ad66f0b19a9afa554cbe6f8fa24ea5">getValues</a> (const Result &amp;result, std::vector&lt; boost::any &gt; &amp;values)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns result values.  <a href="#a62ad66f0b19a9afa554cbe6f8fa24ea5"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html#a31f67f41ac5ac491d59e911a46fe4238">setValue</a> (Result &amp;result, int &amp;index, const boost::any &amp;value)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Sets a result value.  <a href="#a31f67f41ac5ac491d59e911a46fe4238"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static Result&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html#ad5ff66197006a5daef3ce806ad29ddf7">create</a> ()</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Creates a new result.  <a href="#ad5ff66197006a5daef3ce806ad29ddf7"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html#af54fbd95d2319077cacbb718d6f33f1b">add</a> (<a class="el" href="classWt_1_1Dbo_1_1Session.html">Session</a> &amp;session, Result &amp;result)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Adds a new result to the session.  <a href="#af54fbd95d2319077cacbb718d6f33f1b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html#ae60de38f7bbffad41f60bd80df2ad8ca">remove</a> (Result &amp;result)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Removes a result from the session.  <a href="#ae60de38f7bbffad41f60bd80df2ad8ca"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static long long&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html#a9bda07d1461175e20b005c58687b0baf">id</a> (const Result &amp;result)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns a unique id for a result.  <a href="#a9bda07d1461175e20b005c58687b0baf"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static Result&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html#a14af7eff41790d5f0328d09a5fb57748">findById</a> (<a class="el" href="classWt_1_1Dbo_1_1Session.html">Session</a> &amp;session, long long id)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Find a result by id.  <a href="#a14af7eff41790d5f0328d09a5fb57748"></a><br/></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><h3>template&lt;typename Result&gt;<br/>
class Wt::Dbo::query_result_traits&lt; Result &gt;</h3>

<p>Traits class for result types. </p>
<p>This traits class may be used to add support for using classes or structs as a result for a <a class="el" href="classWt_1_1Dbo_1_1Session.html#a8cad70bef9cffd6613107d5cd3aeb16a" title="Creates a query.">Session::query()</a>.</p>
<p>The library provides by default support for primitive types, using <a class="el" href="structWt_1_1Dbo_1_1sql__value__traits.html" title="Traits class for value types.">sql_value_traits</a>, mapped objects held by ptr types, and boost::tuple&lt;&gt; of any combination of these.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="structWt_1_1Dbo_1_1sql__value__traits.html" title="Traits class for value types.">sql_value_traits</a>, <a class="el" href="classWt_1_1Dbo_1_1ptr.html" title="A smart pointer for a database object.">ptr</a> </dd></dl>
</div><hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="af54fbd95d2319077cacbb718d6f33f1b"></a><!-- doxytag: member="Wt::Dbo::query_result_traits::add" ref="af54fbd95d2319077cacbb718d6f33f1b" args="(Session &amp;session, Result &amp;result)" -->
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template&lt;typename Result &gt; </div>
      <table class="memname">
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          <td class="memname">void <a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html">Wt::Dbo::query_result_traits</a>&lt; Result &gt;::add </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="classWt_1_1Dbo_1_1Session.html">Session</a> &amp;&#160;</td>
          <td class="paramname"><em>session</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">Result &amp;&#160;</td>
          <td class="paramname"><em>result</em>&#160;</td>
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        <tr>
          <td></td>
          <td>)</td>
          <td></td><td><code> [static]</code></td>
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<p>Adds a new result to the session. </p>
<p>Adds a (newly created) result to a session.</p>
<p>This method needs to be implemented only if you want to create new results from a <a class="el" href="classWt_1_1Dbo_1_1QueryModel.html" title="A Wt MVC Model to view/edit query results.">QueryModel</a> (which implements Wt's MVC item model). </p>

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<a class="anchor" id="ad5ff66197006a5daef3ce806ad29ddf7"></a><!-- doxytag: member="Wt::Dbo::query_result_traits::create" ref="ad5ff66197006a5daef3ce806ad29ddf7" args="()" -->
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template&lt;typename Result &gt; </div>
      <table class="memname">
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          <td class="memname">Result <a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html">Wt::Dbo::query_result_traits</a>&lt; Result &gt;::create </td>
          <td>(</td>
          <td class="paramname"></td><td>)</td>
          <td><code> [static]</code></td>
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<p>Creates a new result. </p>
<p>Creates a new result. This should initialize a result so that its values can be set using <a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html#a31f67f41ac5ac491d59e911a46fe4238" title="Sets a result value.">setValue()</a> or read using <a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html#a62ad66f0b19a9afa554cbe6f8fa24ea5" title="Returns result values.">getValues()</a>.</p>
<p>The result should not yet be associated with a session.</p>
<p>This method needs to be implemented only if you want to create new results from a <a class="el" href="classWt_1_1Dbo_1_1QueryModel.html" title="A Wt MVC Model to view/edit query results.">QueryModel</a> (which implements Wt's MVC item model). </p>

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<a class="anchor" id="a14af7eff41790d5f0328d09a5fb57748"></a><!-- doxytag: member="Wt::Dbo::query_result_traits::findById" ref="a14af7eff41790d5f0328d09a5fb57748" args="(Session &amp;session, long long id)" -->
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template&lt;typename Result &gt; </div>
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          <td>(</td>
          <td class="paramtype"><a class="el" href="classWt_1_1Dbo_1_1Session.html">Session</a> &amp;&#160;</td>
          <td class="paramname"><em>session</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">long long&#160;</td>
          <td class="paramname"><em>id</em>&#160;</td>
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          <td></td>
          <td>)</td>
          <td></td><td><code> [static]</code></td>
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<p>Find a result by id. </p>
<p>This needs to be inverse of <a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html#a9bda07d1461175e20b005c58687b0baf" title="Returns a unique id for a result.">id()</a> </p>

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<a class="anchor" id="a15021d5b70cb03ee08b39f0c45b02572"></a><!-- doxytag: member="Wt::Dbo::query_result_traits::getFields" ref="a15021d5b70cb03ee08b39f0c45b02572" args="(Session &amp;session, std::vector&lt; std::string &gt; *aliases, std::vector&lt; FieldInfo &gt; &amp;result)" -->
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template&lt;typename Result &gt; </div>
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          <td class="memname">void <a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html">Wt::Dbo::query_result_traits</a>&lt; Result &gt;::getFields </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="classWt_1_1Dbo_1_1Session.html">Session</a> &amp;&#160;</td>
          <td class="paramname"><em>session</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">std::vector&lt; std::string &gt; *&#160;</td>
          <td class="paramname"><em>aliases</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">std::vector&lt; <a class="el" href="classWt_1_1Dbo_1_1FieldInfo.html">FieldInfo</a> &gt; &amp;&#160;</td>
          <td class="paramname"><em>result</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td><code> [static]</code></td>
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<p>Obtains the list of fields in this result. </p>
<p>This is used to build the <em>select</em> clause of an Sql query.</p>
<p>The given <code>aliases</code> may be used to qualify fields that correspond to entire tables (popping values from the front of this vector). An exception is thrown if not enough aliases were provided.</p>
<p>This method is needed when you want to use Result as the result of query. </p>

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<a class="anchor" id="a62ad66f0b19a9afa554cbe6f8fa24ea5"></a><!-- doxytag: member="Wt::Dbo::query_result_traits::getValues" ref="a62ad66f0b19a9afa554cbe6f8fa24ea5" args="(const Result &amp;result, std::vector&lt; boost::any &gt; &amp;values)" -->
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          <td class="memname">void <a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html">Wt::Dbo::query_result_traits</a>&lt; Result &gt;::getValues </td>
          <td>(</td>
          <td class="paramtype">const Result &amp;&#160;</td>
          <td class="paramname"><em>result</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">std::vector&lt; boost::any &gt; &amp;&#160;</td>
          <td class="paramname"><em>values</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td><code> [static]</code></td>
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<p>Returns result values. </p>
<p>This returns the individual field values in the given <code>result</code>.</p>
<p>This method needs to be implemented only if you want to display the result in a <a class="el" href="classWt_1_1Dbo_1_1QueryModel.html" title="A Wt MVC Model to view/edit query results.">QueryModel</a> (which implements Wt's MVC item model). </p>

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<a class="anchor" id="a9bda07d1461175e20b005c58687b0baf"></a><!-- doxytag: member="Wt::Dbo::query_result_traits::id" ref="a9bda07d1461175e20b005c58687b0baf" args="(const Result &amp;result)" -->
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          <td>(</td>
          <td class="paramtype">const Result &amp;&#160;</td>
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          <td><code> [static]</code></td>
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<p>Returns a unique id for a result. </p>
<p>This method needs to be implemented to return a unique id for a result which can later be used to find the result.</p>
<p>If not supported, return -1.</p>
<dl class="see"><dt><b>See also:</b></dt><dd>findbyId() </dd></dl>

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<a class="anchor" id="a24228c4fbd6fd851a44c7aaf3416d0b3"></a><!-- doxytag: member="Wt::Dbo::query_result_traits::load" ref="a24228c4fbd6fd851a44c7aaf3416d0b3" args="(Session &amp;session, SqlStatement &amp;statement, int &amp;column)" -->
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          <td>(</td>
          <td class="paramtype"><a class="el" href="classWt_1_1Dbo_1_1Session.html">Session</a> &amp;&#160;</td>
          <td class="paramname"><em>session</em>, </td>
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          <td class="paramkey"></td>
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          <td class="paramtype"><a class="el" href="classWt_1_1Dbo_1_1SqlStatement.html">SqlStatement</a> &amp;&#160;</td>
          <td class="paramname"><em>statement</em>, </td>
        </tr>
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          <td class="paramtype">int &amp;&#160;</td>
          <td class="paramname"><em>column</em>&#160;</td>
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          <td>)</td>
          <td></td><td><code> [static]</code></td>
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<p>Reads a result from an executed query. </p>
<p>This reads the value from the <code>statement</code>, starting at column <code>column</code>, and advancing the column pointer for as many columns as needed (and according to the number of fields returned by <a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html#a15021d5b70cb03ee08b39f0c45b02572" title="Obtains the list of fields in this result.">getFields()</a>).</p>
<p>This method is needed when you want to use Result as the result of query. </p>

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<a class="anchor" id="ae60de38f7bbffad41f60bd80df2ad8ca"></a><!-- doxytag: member="Wt::Dbo::query_result_traits::remove" ref="ae60de38f7bbffad41f60bd80df2ad8ca" args="(Result &amp;result)" -->
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          <td>(</td>
          <td class="paramtype">Result &amp;&#160;</td>
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          <td><code> [static]</code></td>
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<p>Removes a result from the session. </p>
<p>This method needs to be implemented only if you want to remove results from a <a class="el" href="classWt_1_1Dbo_1_1QueryModel.html" title="A Wt MVC Model to view/edit query results.">QueryModel</a> (which implements Wt's MVC item model). </p>

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<a class="anchor" id="a31f67f41ac5ac491d59e911a46fe4238"></a><!-- doxytag: member="Wt::Dbo::query_result_traits::setValue" ref="a31f67f41ac5ac491d59e911a46fe4238" args="(Result &amp;result, int &amp;index, const boost::any &amp;value)" -->
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template&lt;typename Result &gt; </div>
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          <td class="memname">void <a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html">Wt::Dbo::query_result_traits</a>&lt; Result &gt;::setValue </td>
          <td>(</td>
          <td class="paramtype">Result &amp;&#160;</td>
          <td class="paramname"><em>result</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int &amp;&#160;</td>
          <td class="paramname"><em>index</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const boost::any &amp;&#160;</td>
          <td class="paramname"><em>value</em>&#160;</td>
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          <td>)</td>
          <td></td><td><code> [static]</code></td>
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<p>Sets a result value. </p>
<p>Sets the value at <code>index</code>, where index indicates the field whose value needs to be updated.</p>
<p>When <code>index</code> is out-of-bounds, it should be decremented with as many fields as there are in this result type. Otherwise, index should be set to -1 after the value has been set.</p>
<p>This method needs to be implemented only if you want to modify the result from a <a class="el" href="classWt_1_1Dbo_1_1QueryModel.html" title="A Wt MVC Model to view/edit query results.">QueryModel</a> (which implements Wt's MVC item model). </p>

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