Code Igniter User Guide Version 1.5.0

Field Data

Retrieving Field Names

Sometimes it's helpful to gather the field names for a particular table or with a paritcular query result.

$this->db->field_names();

Returns an array containing the field names. This query can be called two ways:

1. You can supply the table name and call it from the $this->db-> object:

$fields = $this->db->field_names('table_name');

foreach ($fields as $field)
{
   echo $field;
}

2. You can gather the feild names associated with any query you run by calling the function from your query result object:

$query = $this->db->query('SELECT * FROM some_table');

foreach ($query->field_names() as $field)
{
   echo $field;
}

Retrieving Field MetaData

Sometimes it's helpful to gather the field names or other metadata, like the column type, max length, etc.

$this->db->field_data();

Returns an array of objects containing field information.

Note: Not all databases provide meta-data.

Usage example:

$fields = $this->db->field_data('table_name');

foreach ($fields as $field)
{
   echo $field->name;
   echo $field->type;
   echo $field->max_length;
   echo $field->primary_key;
}

If you have run a query already you can use the result oject instead of supplying the table name:

$query = $this->db->query("YOUR QUERY");
$fields = $query->field_data();

The following data is available from this function if supported by your database: