The method metaTables() returns a list of the tables in the database. In some databases, the values returned by the method may be restricted based on built-in security in the DBMS.

$ar = $db->metaTables('TABLES');
/*
 * $ar returns:
  [0] => DEPT
  [1] => EMP
  [2] => EMPACT
  [3] => EMP_ACT
  [4] => PROJ
  [5] => ADEFUSR
  ......

The method metaIndexes() returns an array of data containing index information about a requested table

print_r($db->metaIndexes('test'));
 
/*
* Prints
Array(
  [index_name] => Array
  (
    [unique] => 0
    [columns] => Array
    (
         [0] => Column 1
         [1] => Column 2
         [2] => etc........
    )
 
  )
*/

The metaPrimaryKeys() method returns a list of Primary Keys associated with a table

$mpk = $db->metaPrimaryKeys('ACT');
print_r($mpk);
/*
 * Prints 
Array
(
    [0] => ACTNO
)
 
 */

The method metaProcedures() returns a list of stored procedures in a database. Some databases do not support stored procedures. The format of the data returned is as follows:

Array(
  [name_of_procedure] => Array(
      [type] => PROCEDURE or FUNCTION or METHOD
      [catalog] => Catalog (or owner) name
      [schema] => Schema name
      [remarks] => explanatory comment on the procedure
   )
)

The metaForeignKeys() method returns a list of Foreign Keys (sometimes called Constraints) associated with a requested table. Each array entry shows the foreign table, and the fields that are related.

$p = $db->metaForeignKeys('dept_emp');
print_r($p);
/*
 * prints
Array
(
    [employees] => Array
        (
            [0] => emp_no=emp_no
        )
 
    [departments] => Array
        (
            [0] => dept_no=dept_no
        )
 
)
*/