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        Package&nbsp;web2py ::
        <a href="web2py.gluon-module.html">Package&nbsp;gluon</a> ::
        <a href="web2py.gluon.dal-module.html">Module&nbsp;dal</a> ::
        Class&nbsp;Field
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class Field</h1><span class="codelink"><a href="web2py.gluon.dal-pysrc.html#Field">source&nbsp;code</a></span><br /><br />
<pre class="base-tree">
object --+    
         |    
<a href="web2py.gluon.dal.Expression-class.html">Expression</a> --+
             |
            <strong class="uidshort">Field</strong>
</pre>

<hr />
<p>an instance of this class represents a database field</p>
  example:
<pre class="literalblock">
   a = Field(name, 'string', length=32, default=None, required=False,
       requires=IS_NOT_EMPTY(), ondelete='CASCADE',
       notnull=False, unique=False,
       uploadfield=True, widget=None, label=None, comment=None,
       uploadfield=True, # True means store on disk,
                         # 'a_field_name' means store in this field in db
                         # False means file content will be discarded.
       writable=True, readable=True, update=None, authorize=None,
       autodelete=False, represent=None, uploadfolder=None,
       uploadseparate=False # upload to separate directories by uuid_keys
                            # first 2 character and tablename.fieldname
                            # False - old behavior
                            # True - put uploaded file in
                            #   &lt;uploaddir&gt;/&lt;tablename&gt;.&lt;fieldname&gt;/uuid_key[:2]
                            #        directory)
</pre>
  <p>to be used as argument of DAL.define_table</p>
  <p>allowed field types: string, boolean, integer, double, text, blob, 
  date, time, datetime, upload, password</p>
  strings must have a length of Adapter.maxcharlength by default (512 or
  255 for mysql) fields should have a default or they will be required in 
  SQLFORMs the requires argument is used to validate the field input in 
  SQLFORMs<br /><br />

<!-- ==================== INSTANCE METHODS ==================== -->
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          <td><span class="summary-sig"><a href="web2py.gluon.dal.Field-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">fieldname</span>,
        <span class="summary-sig-arg">type</span>=<span class="summary-sig-default"><code class="variable-quote">'</code><code class="variable-string">string</code><code class="variable-quote">'</code></span>,
        <span class="summary-sig-arg">length</span>=<span class="summary-sig-default">1</span>,
        <span class="summary-sig-arg">default</span>=<span class="summary-sig-default">&lt;function &lt;lambda&gt; at 0xd1ec80&gt;</span>,
        <span class="summary-sig-arg">required</span>=<span class="summary-sig-default">True</span>,
        <span class="summary-sig-arg">requires</span>=<span class="summary-sig-default">&lt;function &lt;lambda&gt; at 0xd1ec80&gt;</span>,
        <span class="summary-sig-arg">ondelete</span>=<span class="summary-sig-default"><code class="variable-quote">'</code><code class="variable-string">CASCADE</code><code class="variable-quote">'</code></span>,
        <span class="summary-sig-arg">notnull</span>=<span class="summary-sig-default">True</span>,
        <span class="summary-sig-arg">unique</span>=<span class="summary-sig-default">True</span>,
        <span class="summary-sig-arg">uploadfield</span>=<span class="summary-sig-default">True</span>,
        <span class="summary-sig-arg">widget</span>=<span class="summary-sig-default">1</span>,
        <span class="summary-sig-arg">label</span>=<span class="summary-sig-default">1</span>,
        <span class="summary-sig-arg">comment</span>=<span class="summary-sig-default">1</span>,
        <span class="summary-sig-arg">writable</span>=<span class="summary-sig-default">True</span>,
        <span class="summary-sig-arg">readable</span>=<span class="summary-sig-default">True</span>,
        <span class="summary-sig-arg">update</span>=<span class="summary-sig-default">1</span>,
        <span class="summary-sig-arg">authorize</span>=<span class="summary-sig-default">1</span>,
        <span class="summary-sig-arg">autodelete</span>=<span class="summary-sig-default">True</span>,
        <span class="summary-sig-arg">represent</span>=<span class="summary-sig-default">1</span>,
        <span class="summary-sig-arg">uploadfolder</span>=<span class="summary-sig-default">1</span>,
        <span class="summary-sig-arg">uploadseparate</span>=<span class="summary-sig-default">True</span>,
        <span class="summary-sig-arg">compute</span>=<span class="summary-sig-default">1</span>,
        <span class="summary-sig-arg">custom_store</span>=<span class="summary-sig-default">1</span>,
        <span class="summary-sig-arg">custom_retrieve</span>=<span class="summary-sig-default">1</span>,
        <span class="summary-sig-arg">custom_delete</span>=<span class="summary-sig-default">1</span>)</span><br />
      x.__init__(...) initializes x; see x.__class__.__doc__ for 
      signature</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="web2py.gluon.dal-pysrc.html#Field.__init__">source&nbsp;code</a></span>
            
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      <span class="summary-type">&nbsp;</span>
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      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a name="store"></a><span class="summary-sig-name">store</span>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">file</span>,
        <span class="summary-sig-arg">filename</span>=<span class="summary-sig-default">1</span>,
        <span class="summary-sig-arg">path</span>=<span class="summary-sig-default">1</span>)</span></td>
          <td align="right" valign="top">
            <span class="codelink"><a href="web2py.gluon.dal-pysrc.html#Field.store">source&nbsp;code</a></span>
            
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      <span class="summary-type">&nbsp;</span>
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          <td><span class="summary-sig"><a name="retrieve"></a><span class="summary-sig-name">retrieve</span>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">name</span>,
        <span class="summary-sig-arg">path</span>=<span class="summary-sig-default">1</span>)</span></td>
          <td align="right" valign="top">
            <span class="codelink"><a href="web2py.gluon.dal-pysrc.html#Field.retrieve">source&nbsp;code</a></span>
            
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      <span class="summary-type">&nbsp;</span>
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        <tr>
          <td><span class="summary-sig"><a name="formatter"></a><span class="summary-sig-name">formatter</span>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">value</span>)</span></td>
          <td align="right" valign="top">
            <span class="codelink"><a href="web2py.gluon.dal-pysrc.html#Field.formatter">source&nbsp;code</a></span>
            
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      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a name="validate"></a><span class="summary-sig-name">validate</span>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">value</span>)</span></td>
          <td align="right" valign="top">
            <span class="codelink"><a href="web2py.gluon.dal-pysrc.html#Field.validate">source&nbsp;code</a></span>
            
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      <span class="summary-type">&nbsp;</span>
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        <tr>
          <td><span class="summary-sig"><a name="count"></a><span class="summary-sig-name">count</span>(<span class="summary-sig-arg">self</span>)</span></td>
          <td align="right" valign="top">
            <span class="codelink"><a href="web2py.gluon.dal-pysrc.html#Field.count">source&nbsp;code</a></span>
            
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      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a name="__nonzero__"></a><span class="summary-sig-name">__nonzero__</span>(<span class="summary-sig-arg">self</span>)</span></td>
          <td align="right" valign="top">
            <span class="codelink"><a href="web2py.gluon.dal-pysrc.html#Field.__nonzero__">source&nbsp;code</a></span>
            
          </td>
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    </td>
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      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="web2py.gluon.dal.Field-class.html#__str__" class="summary-sig-name">__str__</a>(<span class="summary-sig-arg">self</span>)</span><br />
      str(x)</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="web2py.gluon.dal-pysrc.html#Field.__str__">source&nbsp;code</a></span>
            
          </td>
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    </td>
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  <tr>
    <td colspan="2" class="summary">
    <p class="indent-wrapped-lines"><b>Inherited from <code><a href="web2py.gluon.dal.Expression-class.html">Expression</a></code></b>:
      <code><a href="web2py.gluon.dal.Expression-class.html#__add__">__add__</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#__div__">__div__</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#__eq__">__eq__</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#__ge__">__ge__</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#__getitem__">__getitem__</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#__getslice__">__getslice__</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#__gt__">__gt__</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#__invert__">__invert__</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#__le__">__le__</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#__lt__">__lt__</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#__mod__">__mod__</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#__mul__">__mul__</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#__ne__">__ne__</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#__or__">__or__</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#__sub__">__sub__</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#belongs">belongs</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#coalesce_zero">coalesce_zero</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#contains">contains</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#day">day</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#endswith">endswith</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#hour">hour</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#len">len</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#like">like</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#lower">lower</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#max">max</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#min">min</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#minutes">minutes</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#month">month</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#seconds">seconds</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#startswith">startswith</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#sum">sum</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#upper">upper</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#with_alias">with_alias</a></code>,
      <code><a href="web2py.gluon.dal.Expression-class.html#year">year</a></code>
      </p>
    <p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
      <code>__delattr__</code>,
      <code>__getattribute__</code>,
      <code>__hash__</code>,
      <code>__new__</code>,
      <code>__reduce__</code>,
      <code>__reduce_ex__</code>,
      <code>__repr__</code>,
      <code>__setattr__</code>
      </p>
    </td>
  </tr>
</table>
<!-- ==================== PROPERTIES ==================== -->
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        <td align="right" valign="top"
         ><span class="options">[<a href="#section-Properties"
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         >hide private</a>]</span></td>
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    <td colspan="2" class="summary">
    <p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
      <code>__class__</code>
      </p>
    </td>
  </tr>
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<!-- ==================== METHOD DETAILS ==================== -->
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        <td align="left"><span class="table-header">Method Details</span></td>
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         >hide private</a>]</span></td>
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<a name="__init__"></a>
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  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">__init__</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">fieldname</span>,
        <span class="sig-arg">type</span>=<span class="sig-default"><code class="variable-quote">'</code><code class="variable-string">string</code><code class="variable-quote">'</code></span>,
        <span class="sig-arg">length</span>=<span class="sig-default">1</span>,
        <span class="sig-arg">default</span>=<span class="sig-default">&lt;function &lt;lambda&gt; at 0xd1ec80&gt;</span>,
        <span class="sig-arg">required</span>=<span class="sig-default">True</span>,
        <span class="sig-arg">requires</span>=<span class="sig-default">&lt;function &lt;lambda&gt; at 0xd1ec80&gt;</span>,
        <span class="sig-arg">ondelete</span>=<span class="sig-default"><code class="variable-quote">'</code><code class="variable-string">CASCADE</code><code class="variable-quote">'</code></span>,
        <span class="sig-arg">notnull</span>=<span class="sig-default">True</span>,
        <span class="sig-arg">unique</span>=<span class="sig-default">True</span>,
        <span class="sig-arg">uploadfield</span>=<span class="sig-default">True</span>,
        <span class="sig-arg">widget</span>=<span class="sig-default">1</span>,
        <span class="sig-arg">label</span>=<span class="sig-default">1</span>,
        <span class="sig-arg">comment</span>=<span class="sig-default">1</span>,
        <span class="sig-arg">writable</span>=<span class="sig-default">True</span>,
        <span class="sig-arg">readable</span>=<span class="sig-default">True</span>,
        <span class="sig-arg">update</span>=<span class="sig-default">1</span>,
        <span class="sig-arg">authorize</span>=<span class="sig-default">1</span>,
        <span class="sig-arg">autodelete</span>=<span class="sig-default">True</span>,
        <span class="sig-arg">represent</span>=<span class="sig-default">1</span>,
        <span class="sig-arg">uploadfolder</span>=<span class="sig-default">1</span>,
        <span class="sig-arg">uploadseparate</span>=<span class="sig-default">True</span>,
        <span class="sig-arg">compute</span>=<span class="sig-default">1</span>,
        <span class="sig-arg">custom_store</span>=<span class="sig-default">1</span>,
        <span class="sig-arg">custom_retrieve</span>=<span class="sig-default">1</span>,
        <span class="sig-arg">custom_delete</span>=<span class="sig-default">1</span>)</span>
    <br /><em class="fname">(Constructor)</em>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="web2py.gluon.dal-pysrc.html#Field.__init__">source&nbsp;code</a></span>&nbsp;
    </td>
  </table>
  
  x.__init__(...) initializes x; see x.__class__.__doc__ for 
  signature
  <dl class="fields">
    <dt>Overrides:
      <a href="web2py.gluon.dal.Expression-class.html#__init__">Expression.__init__</a>
    </dt>
  </dl>
</td></tr></table>
</div>
<a name="__str__"></a>
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       cellspacing="0" width="100%" bgcolor="white">
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  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">__str__</span>(<span class="sig-arg">self</span>)</span>
    <br /><em class="fname">(Informal representation operator)</em>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="web2py.gluon.dal-pysrc.html#Field.__str__">source&nbsp;code</a></span>&nbsp;
    </td>
  </table>
  
  str(x)
  <dl class="fields">
    <dt>Overrides:
      <a href="web2py.gluon.dal.Expression-class.html#__str__">Expression.__str__</a>
    </dt>
  </dl>
</td></tr></table>
</div>
<br />
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