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| 33 | <div id="masthead">
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| 34 | <table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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| 35 | <tr>
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| 36 | <td><h1>Code Igniter User Guide Version 1.4.0</h1></td>
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| 37 | <td id="breadcrumb_right"><a href="../../toc.html">Full Table of Contents</a></td>
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| 38 | </tr>
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| 39 | </table>
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| 44 | <table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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| 46 | <td id="breadcrumb">
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| 47 | <a href="http://www.codeigniter.com/">Code Igniter Home</a> ›
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| 48 | <a href="../../index.html">User Guide Home</a> ›
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| 49 | <a href="index.html">Database Library</a> ›
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| 50 | Field Names
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| 51 | </td>
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| 62 | <div id="content">
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| 63 |
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| 64 |
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| 65 | <h1>Field Data</h1>
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| 66 |
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| 67 |
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| 68 | <h2>Retrieving Field Names</h2>
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| 69 | <p>Sometimes it's helpful to gather the field names.</p>
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| 70 |
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| 71 | <h2>$this->db->field_names();</h2>
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| 72 | <p>Returns an array containing the field names. You must supply the table name to the function:</p>
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| 73 |
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| 74 | <code>
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| 75 | $fields = $this->db->field_names('table_name');<br /><br />
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| 76 |
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| 77 | foreach ($fields as $field)<br />
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| 78 | {<br />
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| 79 | echo $field;<br />
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| 80 | }
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| 81 | </code>
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| 82 |
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| 83 |
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| 84 |
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| 85 | <h2>Retrieving Field MetaData</h2>
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| 86 | <p>Sometimes it's helpful to gather the field names or other metadata, like the column type, max length, etc.</p>
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| 87 |
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| 88 | <h2>$this->db->field_data();</h2>
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| 89 | <p>Returns an array of objects containing field information.</p>
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| 90 |
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| 91 | <p class="important">Note: Not all databases provide meta-data.</p>
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| 92 |
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| 93 | <p>Usage example:</p>
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| 94 |
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| 95 | <code>
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| 96 | $fields = $this->db->field_data('table_name');<br /><br />
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| 97 |
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| 98 | foreach ($fields as $field)<br />
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| 99 | {<br />
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| 100 | echo $field->name;<br />
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| 101 | echo $field->type;<br />
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| 102 | echo $field->max_length;<br />
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| 103 | echo $field->primary_key;<br />
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| 104 | }
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| 105 | </code>
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| 106 |
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| 107 | <p>If you have run a query already you can use the result oject instead of supplying the table name:</p>
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| 108 |
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| 109 | <code>
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| 110 | $query = $this->db->query("YOUR QUERY");<br />
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| 111 | $fields = $query->field_data();
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| 112 | </code>
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| 113 |
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| 114 |
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| 115 | <p>The following data is available from this function if supported by your database:</p>
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| 116 |
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| 117 | <ul>
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| 118 | <li>name - column name</li>
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| 119 | <li>max_length - maximum length of the column</li>
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| 120 | <li>primary_key - 1 if the column is a primary key</li>
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| 121 | <li>type - the type of the column</li>
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| 122 | </ul>
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| 123 |
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| 124 |
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| 125 |
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| 126 |
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| 127 |
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| 128 | </div>
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| 129 | <!-- END CONTENT -->
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| 130 |
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| 131 |
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| 132 | <div id="footer">
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| 133 | <p>
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| 134 | Previous Topic: <a href="results.html">Query Results</a>
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| 135 | ·
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| 136 | <a href="#top">Top of Page</a> ·
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| 137 | <a href="../../index.html">User Guide Home</a> ·
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| 138 | Next Topic: <a href="table_data.html">Table MetaData</a>
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| 140 | <p><a href="http://www.codeigniter.com">Code Igniter</a> · Copyright © 2006 · <a href="http://www.pmachine.com">pMachine, Inc.</a></p>
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