sqlite.php

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            if (!empty($collation)) {
                $definition['fields'][$column_name]['sorting'] =
                    ($collation=='ASC' ? 'ascending' : 'descending');
            }
        }

        if (empty($definition['fields'])) {
            return $db->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
                'it was not specified an existing table index', __FUNCTION__);
        }
        return $definition;
    }

    // }}}
    // {{{ getTableConstraintDefinition()

    /**
     * Get the stucture of a constraint into an array
     *
     * @param string $table_name      name of table that should be used in method
     * @param string $constraint_name name of constraint that should be used in method
     * @return mixed data array on success, a MDB2 error on failure
     * @access public
     */
    function getTableConstraintDefinition($table_name, $constraint_name)
    {
        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }
        
        list($schema, $table) = $this->splitTableSchema($table_name);

        $query = "SELECT sql FROM sqlite_master WHERE type='index' AND ";
        if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
            $query.= 'LOWER(name)=%s AND LOWER(tbl_name)=' . $db->quote(strtolower($table), 'text');
        } else {
            $query.= 'name=%s AND tbl_name=' . $db->quote($table, 'text');
        }
        $query.= ' AND sql NOT NULL ORDER BY name';
        $constraint_name_mdb2 = $db->getIndexName($constraint_name);
        if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
            $qry = sprintf($query, $db->quote(strtolower($constraint_name_mdb2), 'text'));
        } else {
            $qry = sprintf($query, $db->quote($constraint_name_mdb2, 'text'));
        }
        $sql = $db->queryOne($qry, 'text');
        if (PEAR::isError($sql) || empty($sql)) {
            // fallback to the given $index_name, without transformation
            if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
                $qry = sprintf($query, $db->quote(strtolower($constraint_name), 'text'));
            } else {
                $qry = sprintf($query, $db->quote($constraint_name, 'text'));
            }
            $sql = $db->queryOne($qry, 'text');
        }
        if (PEAR::isError($sql)) {
            return $sql;
        }
        //default values, eventually overridden
        $definition = array(
            'primary' => false,
            'unique'  => false,
            'foreign' => false,
            'check'   => false,
            'fields'  => array(),
            'references' => array(
                'table'  => '',
                'fields' => array(),
            ),
            'onupdate'  => '',
            'ondelete'  => '',
            'match'     => '',
            'deferrable'        => false,
            'initiallydeferred' => false,
        );
        if (!$sql) {
            $query = "SELECT sql FROM sqlite_master WHERE type='table' AND ";
            if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
                $query.= 'LOWER(name)='.$db->quote(strtolower($table), 'text');
            } else {
                $query.= 'name='.$db->quote($table, 'text');
            }
            $query.= " AND sql NOT NULL ORDER BY name";
            $sql = $db->queryOne($query, 'text');
            if (PEAR::isError($sql)) {
                return $sql;
            }
            if ($constraint_name == 'primary') {
                // search in table definition for PRIMARY KEYs
                if (preg_match("/\bPRIMARY\s+KEY\b\s*\(([^)]+)/i", $sql, $tmp)) {
                    $definition['primary'] = true;
                    $definition['fields'] = array();
                    $column_names = split(',', $tmp[1]);
                    $colpos = 1;
                    foreach ($column_names as $column_name) {
                        $definition['fields'][trim($column_name)] = array(
                            'position' => $colpos++
                        );
                    }
                    return $definition;
                }
                if (preg_match("/\"([^\"]+)\"[^\,\"]+\bPRIMARY\s+KEY\b[^\,\)]*/i", $sql, $tmp)) {
                    $definition['primary'] = true;
                    $definition['fields'] = array();
                    $column_names = split(',', $tmp[1]);
                    $colpos = 1;
                    foreach ($column_names as $column_name) {
                        $definition['fields'][trim($column_name)] = array(
                            'position' => $colpos++
                        );
                    }
                    return $definition;
                }
            } else {
                // search in table definition for FOREIGN KEYs
                $pattern = "/\bCONSTRAINT\b\s+%s\s+
                    \bFOREIGN\s+KEY\b\s*\(([^\)]+)\)\s*
                    \bREFERENCES\b\s+([^\s]+)\s*\(([^\)]+)\)\s*
                    (?:\bMATCH\s*([^\s]+))?\s*
                    (?:\bON\s+UPDATE\s+([^\s,\)]+))?\s*
                    (?:\bON\s+DELETE\s+([^\s,\)]+))?\s*
                    /imsx";
                $found_fk = false;
                if (preg_match(sprintf($pattern, $constraint_name_mdb2), $sql, $tmp)) {
                    $found_fk = true;
                } elseif (preg_match(sprintf($pattern, $constraint_name), $sql, $tmp)) {
                    $found_fk = true;
                }
                if ($found_fk) {
                    $definition['foreign'] = true;
                    $definition['match'] = 'SIMPLE';
                    $definition['onupdate'] = 'NO ACTION';
                    $definition['ondelete'] = 'NO ACTION';
                    $definition['references']['table'] = $tmp[2];
                    $column_names = split(',', $tmp[1]);
                    $colpos = 1;
                    foreach ($column_names as $column_name) {
                        $definition['fields'][trim($column_name)] = array(
                            'position' => $colpos++
                        );
                    }
                    $referenced_cols = split(',', $tmp[3]);
                    $colpos = 1;
                    foreach ($referenced_cols as $column_name) {
                        $definition['references']['fields'][trim($column_name)] = array(
                            'position' => $colpos++
                        );
                    }
                    if (isset($tmp[4])) {
                        $definition['match']    = $tmp[4];
                    }
                    if (isset($tmp[5])) {
                        $definition['onupdate'] = $tmp[5];
                    }
                    if (isset($tmp[6])) {
                        $definition['ondelete'] = $tmp[6];
                    }
                    return $definition;
                }
            }
            $sql = false;
        }
        if (!$sql) {
            return $db->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
                $constraint_name . ' is not an existing table constraint', __FUNCTION__);
        }

        $sql = strtolower($sql);
        $start_pos = strpos($sql, '(');
        $end_pos   = strrpos($sql, ')');
        $column_names = substr($sql, $start_pos+1, $end_pos-$start_pos-1);
        $column_names = split(',', $column_names);

        if (!preg_match("/^create unique/", $sql)) {
            return $db->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
                $constraint_name . ' is not an existing table constraint', __FUNCTION__);
        }

        $definition['unique'] = true;
        $count = count($column_names);
        for ($i=0; $i<$count; ++$i) {
            $column_name = strtok($column_names[$i]," ");
            $collation = strtok(" ");
            $definition['fields'][$column_name] = array(
                'position' => $i+1
            );
            if (!empty($collation)) {
                $definition['fields'][$column_name]['sorting'] =
                    ($collation=='ASC' ? 'ascending' : 'descending');
            }
        }

        if (empty($definition['fields'])) {
            return $db->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
                $constraint_name . ' is not an existing table constraint', __FUNCTION__);
        }
        return $definition;
    }

    // }}}
    // {{{ getTriggerDefinition()

    /**
     * Get the structure of a trigger into an array
     *
     * EXPERIMENTAL
     *
     * WARNING: this function is experimental and may change the returned value
     * at any time until labelled as non-experimental
     *
     * @param string    $trigger    name of trigger that should be used in method
     * @return mixed data array on success, a MDB2 error on failure
     * @access public
     */
    function getTriggerDefinition($trigger)
    {
        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }

        $query = "SELECT name as trigger_name,
                         tbl_name AS table_name,
                         sql AS trigger_body,
                         NULL AS trigger_type,
                         NULL AS trigger_event,
                         NULL AS trigger_comment,
                         1 AS trigger_enabled
                    FROM sqlite_master
                   WHERE type='trigger'";
        if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
            $query.= ' AND LOWER(name)='.$db->quote(strtolower($trigger), 'text');
        } else {
            $query.= ' AND name='.$db->quote($trigger, 'text');
        }
        $types = array(
            'trigger_name'    => 'text',
            'table_name'      => 'text',
            'trigger_body'    => 'text',
            'trigger_type'    => 'text',
            'trigger_event'   => 'text',
            'trigger_comment' => 'text',
            'trigger_enabled' => 'boolean',
        );
        $def = $db->queryRow($query, $types, MDB2_FETCHMODE_ASSOC);
        if (PEAR::isError($def)) {
            return $def;
        }
        if (empty($def)) {
            return $db->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
                'it was not specified an existing trigger', __FUNCTION__);
        }
        if (preg_match("/^create\s+(?:temp|temporary)?trigger\s+(?:if\s+not\s+exists\s+)?.*(before|after)?\s+(insert|update|delete)/Uims", $def['trigger_body'], $tmp)) {
            $def['trigger_type'] = strtoupper($tmp[1]);
            $def['trigger_event'] = strtoupper($tmp[2]);
        }
        return $def;
    }

    // }}}
    // {{{ tableInfo()

    /**
     * Returns information about a table
     *
     * @param string         $result  a string containing the name of a table
     * @param int            $mode    a valid tableInfo mode
     *
     * @return array  an associative array with the information requested.
     *                 A MDB2_Error object on failure.
     *
     * @see MDB2_Driver_Common::tableInfo()
     * @since Method available since Release 1.7.0
     */
    function tableInfo($result, $mode = null)
    {
        if (is_string($result)) {
           return parent::tableInfo($result, $mode);
        }

        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }

        return $db->raiseError(MDB2_ERROR_NOT_CAPABLE, null, null,
           'This DBMS can not obtain tableInfo from result sets', __FUNCTION__);
    }
}

?>