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authordchill42 <dchill42@gmail.com>2012-07-23 16:53:47 +0200
committerdchill42 <dchill42@gmail.com>2012-07-23 16:53:47 +0200
commitc5079de78e5141330c07e990811ef15e998e95aa (patch)
tree0f39d8c4fc7614246fc185810bfeaa7fad88a33a /user_guide_src/source/database/fields.rst
parent00fcb545109d4e61bc14e403ec828749c34a54b3 (diff)
parentede49ba66b127535f3430e20aac72ceed2c4611a (diff)
Merge branch develop of github.com:/EllisLab/CodeIgniter into session
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+##########
+Field Data
+##########
+
+$this->db->list_fields()
+=========================
+
+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 = $this->db->list_fields('table_name');
+
+ foreach ($fields as $field)
+ {
+ echo $field;
+ }
+
+2. You can gather the field 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->list_fields() as $field)
+ {
+ echo $field;
+ }
+
+$this->db->field_exists()
+==========================
+
+Sometimes it's helpful to know whether a particular field exists before
+performing an action. Returns a boolean TRUE/FALSE. Usage example::
+
+ if ($this->db->field_exists('field_name', 'table_name'))
+ {
+ // some code...
+ }
+
+.. note:: Replace *field_name* with the name of the column you are looking
+ for, and replace *table_name* with the name of the table you are
+ looking for.
+
+$this->db->field_data()
+========================
+
+Returns an array of objects containing field information.
+
+Sometimes it's helpful to gather the field names or other metadata, like
+the column type, max length, etc.
+
+.. 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 object 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:
+
+- name - column name
+- max_length - maximum length of the column
+- primary_key - 1 if the column is a primary key
+- type - the type of the column \ No newline at end of file