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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Variables</title>
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<a href="#rasqal-section-variable.synopsis" class="shortcut">Top</a>
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                  <a href="#rasqal-section-variable.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="rasqal-section-variable"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="rasqal-section-variable.top_of_page"></a>Variables</span></h2>
<p>Variables — Variable with names and literal value.</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="rasqal-section-variable.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">                    <a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable">rasqal_variable</a>;
<a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable"><span class="returnvalue">rasqal_variable</span></a> *   <a class="link" href="rasqal-section-variable.html#rasqal-new-variable-from-variable" title="rasqal_new_variable_from_variable ()">rasqal_new_variable_from_variable</a>   (<em class="parameter"><code><a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable"><span class="type">rasqal_variable</span></a> *v</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="rasqal-section-variable.html#rasqal-free-variable" title="rasqal_free_variable ()">rasqal_free_variable</a>                (<em class="parameter"><code><a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable"><span class="type">rasqal_variable</span></a> *v</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="rasqal-section-variable.html#rasqal-variable-print" title="rasqal_variable_print ()">rasqal_variable_print</a>               (<em class="parameter"><code><a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable"><span class="type">rasqal_variable</span></a> *v</code></em>,
                                                         <em class="parameter"><code><span class="type">FILE</span> *fh</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="rasqal-section-variable.html#rasqal-variable-set-value" title="rasqal_variable_set_value ()">rasqal_variable_set_value</a>           (<em class="parameter"><code><a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable"><span class="type">rasqal_variable</span></a> *v</code></em>,
                                                         <em class="parameter"><code><a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> *l</code></em>);
enum                <a class="link" href="rasqal-section-variable.html#rasqal-variable-type" title="enum rasqal_variable_type">rasqal_variable_type</a>;
</pre>
</div>
<div class="refsect1">
<a name="rasqal-section-variable.description"></a><h2>Description</h2>
<p>
A class to hold a variable with optional name and a
<a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> value.  The name is not required for SPARQL
anonymous variables.
</p>
</div>
<div class="refsect1">
<a name="rasqal-section-variable.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="rasqal-variable"></a><h3>rasqal_variable</h3>
<pre class="programlisting">typedef struct {
  rasqal_variables_table* vars_table;
  const char * name;
  rasqal_literal* value;
  int offset;
  rasqal_variable_type type;
  struct rasqal_expression_s* expression;
  void *user_data;
  int usage;
} rasqal_variable;
</pre>
<p>
Binding between a variable name and a value.
</p>
<p>
Includes internal field <em class="parameter"><code>offset</code></em> for recording the offset into the
(internal) rasqal_query variables array.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="rasqal-section-variables-table.html#rasqal-variables-table" title="rasqal_variables_table"><span class="type">rasqal_variables_table</span></a> *<em class="structfield"><code><a name="rasqal-variable.vars-table"></a>vars_table</code></em>;</span></p></td>
<td>variables table that owns this variable</td>
</tr>
<tr>
<td><p><span class="term">const <span class="type">char</span> *<em class="structfield"><code><a name="rasqal-variable.name"></a>name</code></em>;</span></p></td>
<td>Variable name.</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> *<em class="structfield"><code><a name="rasqal-variable.value"></a>value</code></em>;</span></p></td>
<td>Variable value or NULL if unbound.</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="rasqal-variable.offset"></a>offset</code></em>;</span></p></td>
<td>Internal.</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="rasqal-section-variable.html#rasqal-variable-type" title="enum rasqal_variable_type"><span class="type">rasqal_variable_type</span></a> <em class="structfield"><code><a name="rasqal-variable.type"></a>type</code></em>;</span></p></td>
<td>Variable type.</td>
</tr>
<tr>
<td><p><span class="term">struct <span class="type">rasqal_expression_s</span> *<em class="structfield"><code><a name="rasqal-variable.expression"></a>expression</code></em>;</span></p></td>
<td>Expression when the variable is a computed SELECT expression</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">void</span> *<em class="structfield"><code><a name="rasqal-variable.user-data"></a>user_data</code></em>;</span></p></td>
<td>Pointer to user data associated with a variable.  This is not used by rasqal.</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="rasqal-variable.usage"></a>usage</code></em>;</span></p></td>
<td>reference count</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-new-variable-from-variable"></a><h3>rasqal_new_variable_from_variable ()</h3>
<pre class="programlisting"><a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable"><span class="returnvalue">rasqal_variable</span></a> *   rasqal_new_variable_from_variable   (<em class="parameter"><code><a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable"><span class="type">rasqal_variable</span></a> *v</code></em>);</pre>
<p>
Copy Constructor - Create a new Rasqal variable from an existing one
</p>
<p>
This adds a new reference to the variable, it does not do a deep copy
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>v</code></em> :</span></p></td>
<td>
<a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable"><span class="type">rasqal_variable</span></a> to copy</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable"><span class="type">rasqal_variable</span></a> or NULL on failure.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-free-variable"></a><h3>rasqal_free_variable ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                rasqal_free_variable                (<em class="parameter"><code><a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable"><span class="type">rasqal_variable</span></a> *v</code></em>);</pre>
<p>
Destructor - Destroy a Rasqal variable object.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>v</code></em> :</span></p></td>
<td>
<a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable"><span class="type">rasqal_variable</span></a> object</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-variable-print"></a><h3>rasqal_variable_print ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 rasqal_variable_print               (<em class="parameter"><code><a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable"><span class="type">rasqal_variable</span></a> *v</code></em>,
                                                         <em class="parameter"><code><span class="type">FILE</span> *fh</code></em>);</pre>
<p>
Print a Rasqal variable in a debug format.
</p>
<p>
The print debug format may change in any release.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>v</code></em> :</span></p></td>
<td>the <a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable"><span class="type">rasqal_variable</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>fh</code></em> :</span></p></td>
<td>the FILE* handle to print to</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>non-0 on failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-variable-set-value"></a><h3>rasqal_variable_set_value ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                rasqal_variable_set_value           (<em class="parameter"><code><a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable"><span class="type">rasqal_variable</span></a> *v</code></em>,
                                                         <em class="parameter"><code><a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> *l</code></em>);</pre>
<p>
Set the value of a Rasqal variable.
</p>
<p>
The variable value is an input parameter and is copied in, not shared.
If the variable value is NULL, any existing value is deleted.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>v</code></em> :</span></p></td>
<td>the <a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable"><span class="type">rasqal_variable</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>l</code></em> :</span></p></td>
<td>the <a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> value to set (or NULL)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-variable-type"></a><h3>enum rasqal_variable_type</h3>
<pre class="programlisting">typedef enum {
  RASQAL_VARIABLE_TYPE_UNKNOWN   = 0,
  RASQAL_VARIABLE_TYPE_NORMAL    = 1,
  RASQAL_VARIABLE_TYPE_ANONYMOUS = 2
} rasqal_variable_type;
</pre>
<p>
Rasqal variable types.
</p>
<p>
ANONYMOUS can be used in queries but cannot be returned in a
result.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="RASQAL-VARIABLE-TYPE-UNKNOWN:CAPS"></a><span class="term"><code class="literal">RASQAL_VARIABLE_TYPE_UNKNOWN</code></span></p></td>
<td>Internal.
</td>
</tr>
<tr>
<td><p><a name="RASQAL-VARIABLE-TYPE-NORMAL:CAPS"></a><span class="term"><code class="literal">RASQAL_VARIABLE_TYPE_NORMAL</code></span></p></td>
<td>The regular variable type.
</td>
</tr>
<tr>
<td><p><a name="RASQAL-VARIABLE-TYPE-ANONYMOUS:CAPS"></a><span class="term"><code class="literal">RASQAL_VARIABLE_TYPE_ANONYMOUS</code></span></p></td>
<td>Anonymous variable type.
</td>
</tr>
</tbody>
</table></div>
</div>
</div>
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