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<td><h1>CodeIgniter User Guide Version 2.1.3</h1></td>
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<h2>$this->db->list_fields()</h2>
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<p>Returns an array containing the field names. This query can be called two ways:</p>
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<p>1. You can supply the table name and call it from the <dfn>$this->db-></dfn> object:</p>
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$fields = $this->db->list_fields('table_name');<br /><br />
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foreach ($fields as $field)<br />
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echo $field;<br />
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<p>2. You can gather the field names associated with any query you run by calling the function
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from your query result object:</p>
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$query = $this->db->query('SELECT * FROM some_table');
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foreach ($query->list_fields() as $field)<br />
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echo $field;<br />
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<h2>$this->db->field_exists()</h2>
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<p>Sometimes it's helpful to know whether a particular field exists before performing an action.
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Returns a boolean TRUE/FALSE. Usage example:</p>
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if ($this->db->field_exists('field_name', 'table_name'))<br />
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// some code...<br />
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<p>Note: Replace <em>field_name</em> with the name of the column you are looking for, and replace
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<em>table_name</em> with the name of the table you are looking for.</p>
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<h2>$this->db->field_data()</h2>
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<p>Returns an array of objects containing field information.</p>
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<p>Sometimes it's helpful to gather the field names or other metadata, like the column type, max length, etc.</p>
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<p class="important">Note: Not all databases provide meta-data.</p>
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<p>Usage example:</p>
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$fields = $this->db->field_data('table_name');<br /><br />
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foreach ($fields as $field)<br />
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echo $field->name;<br />
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echo $field->type;<br />
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echo $field->max_length;<br />
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echo $field->primary_key;<br />
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<p>If you have run a query already you can use the result object instead of supplying the table name:</p>
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$query = $this->db->query("YOUR QUERY");<br />
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$fields = $query->field_data();
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<p>The following data is available from this function if supported by your database:</p>
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<li>name - column name</li>
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<li>max_length - maximum length of the column</li>
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<li>primary_key - 1 if the column is a primary key</li>
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<li>type - the type of the column</li>
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