mysql.php

This is the script which used on 10minutemail.com for temporary email.

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

        list($schema, $table) = $this->splitTableSchema($table_name);
        $constraint_name_original = $constraint_name;

        $table = $db->quoteIdentifier($table, true);
        $query = "SHOW INDEX FROM $table /*!50002 WHERE Key_name = %s */";
        if (strtolower($constraint_name) != 'primary') {
            $constraint_name_mdb2 = $db->getIndexName($constraint_name);
            $result = $db->queryRow(sprintf($query, $db->quote($constraint_name_mdb2)));
            if (!PEAR::isError($result) && !is_null($result)) {
                // apply 'idxname_format' only if the query succeeded, otherwise
                // fallback to the given $index_name, without transformation
                $constraint_name = $constraint_name_mdb2;
            }
        }
        $result = $db->query(sprintf($query, $db->quote($constraint_name)));
        if (PEAR::isError($result)) {
            return $result;
        }
        $colpos = 1;
        //default values, eventually overridden
        $definition = array(
            'primary' => false,
            'unique'  => false,
            'foreign' => false,
            'check'   => false,
            'fields'  => array(),
            'references' => array(
                'table'  => '',
                'fields' => array(),
            ),
            'onupdate'  => '',
            'ondelete'  => '',
            'match'     => '',
            'deferrable'        => false,
            'initiallydeferred' => false,
        );
        while (is_array($row = $result->fetchRow(MDB2_FETCHMODE_ASSOC))) {
            $row = array_change_key_case($row, CASE_LOWER);
            $key_name = $row['key_name'];
            if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
                if ($db->options['field_case'] == CASE_LOWER) {
                    $key_name = strtolower($key_name);
                } else {
                    $key_name = strtoupper($key_name);
                }
            }
            if ($constraint_name == $key_name) {
                if ($row['non_unique']) {
                    //FOREIGN KEY?
                    $query = 'SHOW CREATE TABLE '. $db->escape($table);
                    $constraint = $db->queryOne($query, 'text', 1);
                    if (!PEAR::isError($constraint) && !empty($constraint)) {
                        if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
                            if ($db->options['field_case'] == CASE_LOWER) {
                                $constraint = strtolower($constraint);
                            } else {
                                $constraint = strtoupper($constraint);
                            }
                        }
                        $pattern = '/\bCONSTRAINT\s+'.$constraint_name.'\s+FOREIGN KEY\s+\(([^\)]+)\) \bREFERENCES\b ([^ ]+) \(([^\)]+)\)/i';
                        if (!preg_match($pattern, str_replace('`', '', $constraint), $matches)) {
                            //fallback to original constraint name
                            $pattern = '/\bCONSTRAINT\s+'.$constraint_name_original.'\s+FOREIGN KEY\s+\(([^\)]+)\) \bREFERENCES\b ([^ ]+) \(([^\)]+)\)/i';
                        }
                        if (preg_match($pattern, str_replace('`', '', $constraint), $matches)) {
                            $definition['foreign'] = true;
                            $column_names = explode(',', $matches[1]);
                            $referenced_cols = explode(',', $matches[3]);
                            $definition['references'] = array(
                                'table'  => $matches[2],
                                'fields' => array(),
                            );
                            $colpos = 1;
                            foreach ($column_names as $column_name) {
                                $definition['fields'][trim($column_name)] = array(
                                    'position' => $colpos++
                                );
                            }
                            $colpos = 1;
                            foreach ($referenced_cols as $column_name) {
                                $definition['references']['fields'][trim($column_name)] = array(
                                    'position' => $colpos++
                                );
                            }
                            $definition['onupdate'] = 'NO ACTION';
                            $definition['ondelete'] = 'NO ACTION';
                            $definition['match']    = 'SIMPLE';
                            return $definition;
                        }
                    }

                    return $db->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
                        $constraint_name . ' is not an existing table constraint', __FUNCTION__);
                }
                if ($row['key_name'] == 'PRIMARY') {
                    $definition['primary'] = true;
                } elseif (!$row['non_unique']) {
                    $definition['unique'] = true;
                }
                $column_name = $row['column_name'];
                if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
                    if ($db->options['field_case'] == CASE_LOWER) {
                        $column_name = strtolower($column_name);
                    } else {
                        $column_name = strtoupper($column_name);
                    }
                }
                $definition['fields'][$column_name] = array(
                    'position' => $colpos++
                );
                if (!empty($row['collation'])) {
                    $definition['fields'][$column_name]['sorting'] = ($row['collation'] == 'A'
                        ? 'ascending' : 'descending');
                }
            }
        }
        $result->free();
        if (empty($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 trigger_name,
                         event_object_table AS table_name,
                         action_statement AS trigger_body,
                         action_timing AS trigger_type,
                         event_manipulation AS trigger_event
                    FROM information_schema.triggers
                   WHERE trigger_name = '. $db->quote($trigger, 'text');
        $types = array(
            'trigger_name'    => 'text',
            'table_name'      => 'text',
            'trigger_body'    => 'text',
            'trigger_type'    => 'text',
            'trigger_event'   => 'text',
        );
        $def = $db->queryRow($query, $types, MDB2_FETCHMODE_ASSOC);
        if (PEAR::isError($def)) {
            return $def;
        }
        $def['trigger_comment'] = '';
        $def['trigger_enabled'] = true;
        return $def;
    }

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

    /**
     * Returns information about a table or a result set
     *
     * @param object|string  $result  MDB2_result object from a query or a
     *                                 string containing the name of a table.
     *                                 While this also accepts a query result
     *                                 resource identifier, this behavior is
     *                                 deprecated.
     * @param int            $mode    a valid tableInfo mode
     *
     * @return array  an associative array with the information requested.
     *                 A MDB2_Error object on failure.
     *
     * @see MDB2_Driver_Common::setOption()
     */
    function tableInfo($result, $mode = null)
    {
        if (is_string($result)) {
           return parent::tableInfo($result, $mode);
        }

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

        $resource = MDB2::isResultCommon($result) ? $result->getResource() : $result;
        if (!is_resource($resource)) {
            return $db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
                'Could not generate result resource', __FUNCTION__);
        }

        if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
            if ($db->options['field_case'] == CASE_LOWER) {
                $case_func = 'strtolower';
            } else {
                $case_func = 'strtoupper';
            }
        } else {
            $case_func = 'strval';
        }

        $count = @mysql_num_fields($resource);
        $res   = array();
        if ($mode) {
            $res['num_fields'] = $count;
        }

        $db->loadModule('Datatype', null, true);
        for ($i = 0; $i < $count; $i++) {
            $res[$i] = array(
                'table' => $case_func(@mysql_field_table($resource, $i)),
                'name'  => $case_func(@mysql_field_name($resource, $i)),
                'type'  => @mysql_field_type($resource, $i),
                'length'   => @mysql_field_len($resource, $i),
                'flags' => @mysql_field_flags($resource, $i),
            );
            if ($res[$i]['type'] == 'string') {
                $res[$i]['type'] = 'char';
            } elseif ($res[$i]['type'] == 'unknown') {
                $res[$i]['type'] = 'decimal';
            }
            $mdb2type_info = $db->datatype->mapNativeDatatype($res[$i]);
            if (PEAR::isError($mdb2type_info)) {
               return $mdb2type_info;
            }
            $res[$i]['mdb2type'] = $mdb2type_info[0][0];
            if ($mode & MDB2_TABLEINFO_ORDER) {
                $res['order'][$res[$i]['name']] = $i;
            }
            if ($mode & MDB2_TABLEINFO_ORDERTABLE) {
                $res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
            }
        }

        return $res;
    }
}
?>