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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Wt: Wt::Dbo::sql_value_traits< V, Enable > Class Template Reference</title>
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<div class="navpath"><a class="el" href="namespaceWt.html">Wt</a>::<a class="el" href="namespaceWt_1_1Dbo.html">Dbo</a>::<a class="el" href="structWt_1_1Dbo_1_1sql__value__traits.html">sql_value_traits</a>
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<div class="contents">
<h1>Wt::Dbo::sql_value_traits< V, Enable > Class Template Reference<br>
<small>
[<a class="el" href="group__dbo.html">Database Objects library (Dbo)</a>]</small>
</h1><!-- doxytag: class="Wt::Dbo::sql_value_traits" -->Traits class for value types.
<a href="#_details">More...</a>
<p>
<code>#include <Wt/Dbo/SqlTraits></code>
<p>
<p>
<a href="classWt_1_1Dbo_1_1sql__value__traits-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1sql__value__traits.html#938ffa7506a84bf46fa6e9a4d3c69253">type</a> (<a class="el" href="classWt_1_1Dbo_1_1SqlConnection.html">SqlConnection</a> *connection, int size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the SQL type name. <a href="#938ffa7506a84bf46fa6e9a4d3c69253"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1sql__value__traits.html#eed1a933f3d83555b5d39ac76b929170">bind</a> (const V &v, <a class="el" href="classWt_1_1Dbo_1_1SqlStatement.html">SqlStatement</a> *statement, int index, int size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Binds a value to a statement parameter. <a href="#eed1a933f3d83555b5d39ac76b929170"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1sql__value__traits.html#dc493756b9faf369c95efd617d2b2624">read</a> (V &v, <a class="el" href="classWt_1_1Dbo_1_1SqlStatement.html">SqlStatement</a> *statement, int column, int size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Reads a result from an executed query. <a href="#dc493756b9faf369c95efd617d2b2624"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
<h3>template<typename V, class Enable = void><br>
class Wt::Dbo::sql_value_traits< V, Enable ></h3>
Traits class for value types.
<p>
This traits class may be specialized for a custom type <code>V</code>, to add dbo support for custom types. A value type has a one-to-one mapping to a single database column.<p>
The library has built-in support for:<ul>
<li>std::string</li><li>char const * (read-only: only as a bound parameter for a query)</li><li>short, int, long, long long</li><li>float, double</li><li>enum types</li><li>std::vector<unsigned char> (binary data)</li><li>boost::optional<T>: to make the type optionally <code>null</code></li></ul>
<p>
In <Wt/Dbo/WtSqlTraits>, traits classes are also provided for:<ul>
<li><a class="el" href="classWt_1_1WDate.html" title="A gregorian calendar date.">WDate</a></li><li><a class="el" href="classWt_1_1WDateTime.html" title="A calendar date and clock time.">WDateTime</a></li><li><a class="el" href="classWt_1_1WString.html" title="A unicode string class, with support for localization.">WString</a></li></ul>
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="structWt_1_1Dbo_1_1sql__result__traits.html" title="Traits class for result types.">sql_result_traits</a> </dd></dl>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="938ffa7506a84bf46fa6e9a4d3c69253"></a><!-- doxytag: member="Wt::Dbo::sql_value_traits::type" ref="938ffa7506a84bf46fa6e9a4d3c69253" args="(SqlConnection *connection, int size)" -->
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<div class="memtemplate">
template<typename V, class Enable = void> </div>
<table class="memname">
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<td class="memname">static const char* <a class="el" href="structWt_1_1Dbo_1_1sql__value__traits.html">Wt::Dbo::sql_value_traits</a>< V, Enable >::type </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classWt_1_1Dbo_1_1SqlConnection.html">SqlConnection</a> * </td>
<td class="paramname"> <em>connection</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>size</em></td><td> </td>
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<td>)</td>
<td></td><td></td><td><code> [static]</code></td>
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<p>
Returns the SQL type name.
<p>
The <code>size</code> (for strings) is a hint and may be ignored by a back-end.
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<a class="anchor" name="eed1a933f3d83555b5d39ac76b929170"></a><!-- doxytag: member="Wt::Dbo::sql_value_traits::bind" ref="eed1a933f3d83555b5d39ac76b929170" args="(const V &v, SqlStatement *statement, int index, int size)" -->
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template<typename V, class Enable = void> </div>
<table class="memname">
<tr>
<td class="memname">static void <a class="el" href="structWt_1_1Dbo_1_1sql__value__traits.html">Wt::Dbo::sql_value_traits</a>< V, Enable >::bind </td>
<td>(</td>
<td class="paramtype">const V & </td>
<td class="paramname"> <em>v</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classWt_1_1Dbo_1_1SqlStatement.html">SqlStatement</a> * </td>
<td class="paramname"> <em>statement</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>index</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>size</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td><code> [static]</code></td>
</tr>
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<p>
Binds a value to a statement parameter.
<p>
The value <code>v</code> must be bound to parameter with index <code>index</code> in the <code>statement</code>.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1Dbo_1_1SqlStatement.html#d8b53ca87bdef11ceceb96ab05c260b9" title="Binds a value to a column.">SqlStatement::bind()</a> </dd></dl>
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</div><p>
<a class="anchor" name="dc493756b9faf369c95efd617d2b2624"></a><!-- doxytag: member="Wt::Dbo::sql_value_traits::read" ref="dc493756b9faf369c95efd617d2b2624" args="(V &v, SqlStatement *statement, int column, int size)" -->
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template<typename V, class Enable = void> </div>
<table class="memname">
<tr>
<td class="memname">static void <a class="el" href="structWt_1_1Dbo_1_1sql__value__traits.html">Wt::Dbo::sql_value_traits</a>< V, Enable >::read </td>
<td>(</td>
<td class="paramtype">V & </td>
<td class="paramname"> <em>v</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classWt_1_1Dbo_1_1SqlStatement.html">SqlStatement</a> * </td>
<td class="paramname"> <em>statement</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>column</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>size</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td><code> [static]</code></td>
</tr>
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<div class="memdoc">
<p>
Reads a result from an executed query.
<p>
The value <code>v</code> must be read from result column <code>column</code> in the <code>statement</code>.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1Dbo_1_1SqlStatement.html#fca829eb43f0977b2af6ea7e0b66aad1" title="Fetches a result value.">SqlStatement::getResult()</a> </dd></dl>
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