<?xml version="1.0" encoding="UTF-8" ?>
<XMLDB PATH="mod/chat/db" VERSION="20100107" COMMENT="XMLDB file for Moodle mod/chat"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
>
  <TABLES>
    <TABLE NAME="chat" COMMENT="Each of these is a chat room" NEXT="chat_messages">
      <FIELDS>
        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" ENUM="false" NEXT="course"/>
        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="id" NEXT="name"/>
        <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" ENUM="false" PREVIOUS="course" NEXT="intro"/>
        <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" ENUM="false" PREVIOUS="name" NEXT="keepdays"/>
        <FIELD NAME="keepdays" TYPE="int" LENGTH="11" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="intro" NEXT="studentlogs"/>
        <FIELD NAME="studentlogs" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="keepdays" NEXT="chattime"/>
        <FIELD NAME="chattime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="studentlogs" NEXT="schedule"/>
        <FIELD NAME="schedule" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="chattime" NEXT="timemodified"/>
        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="schedule" NEXT="showhistory"/>
      	<FIELD NAME="showhistory" TYPE="char" LENGTH="20" NOTNULL="false" SEQUENCE="false" ENUM="false" PREVIOUS="timemodified"/>
      </FIELDS>
      <KEYS>
        <KEY NAME="primary" TYPE="primary" FIELDS="id" />
      </KEYS>
      <INDEXES>
        <INDEX NAME="course" UNIQUE="false" FIELDS="course"/>
      </INDEXES>
    </TABLE>
    <TABLE NAME="chat_messages" COMMENT="Stores all the actual chat messages" PREVIOUS="chat" NEXT="chat_users">
      <FIELDS>
        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" ENUM="false" NEXT="chatid"/>
        <FIELD NAME="chatid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="id" NEXT="userid"/>
        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="chatid" NEXT="groupid"/>
        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="userid" NEXT="system"/>
        <FIELD NAME="system" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="groupid" NEXT="message"/>
        <FIELD NAME="message" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" ENUM="false" PREVIOUS="system" NEXT="timestamp"/>
        <FIELD NAME="timestamp" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="message"/>
      </FIELDS>
      <KEYS>
        <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="chatid"/>
        <KEY NAME="chatid" TYPE="foreign" FIELDS="chatid" REFTABLE="chat" REFFIELDS="id" PREVIOUS="primary"/>
      </KEYS>
      <INDEXES>
        <INDEX NAME="userid" UNIQUE="false" FIELDS="userid" NEXT="groupid"/>
        <INDEX NAME="groupid" UNIQUE="false" FIELDS="groupid" PREVIOUS="userid" NEXT="timestamp-chatid"/>
        <INDEX NAME="timestamp-chatid" UNIQUE="false" FIELDS="timestamp, chatid" PREVIOUS="groupid"/>
      </INDEXES>
    </TABLE>
    <TABLE NAME="chat_users" COMMENT="Keeps track of which users are in which chat rooms" PREVIOUS="chat_messages">
      <FIELDS>
        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" ENUM="false" NEXT="chatid"/>
        <FIELD NAME="chatid" TYPE="int" LENGTH="11" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="id" NEXT="userid"/>
        <FIELD NAME="userid" TYPE="int" LENGTH="11" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="chatid" NEXT="groupid"/>
        <FIELD NAME="groupid" TYPE="int" LENGTH="11" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="userid" NEXT="version"/>
        <FIELD NAME="version" TYPE="char" LENGTH="16" NOTNULL="true" SEQUENCE="false" ENUM="false" PREVIOUS="groupid" NEXT="ip"/>
        <FIELD NAME="ip" TYPE="char" LENGTH="15" NOTNULL="true" SEQUENCE="false" ENUM="false" PREVIOUS="version" NEXT="firstping"/>
        <FIELD NAME="firstping" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="ip" NEXT="lastping"/>
        <FIELD NAME="lastping" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="firstping" NEXT="lastmessageping"/>
        <FIELD NAME="lastmessageping" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="lastping" NEXT="sid"/>
        <FIELD NAME="sid" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" ENUM="false" PREVIOUS="lastmessageping" NEXT="course"/>
        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" ENUM="false" PREVIOUS="sid" NEXT="lang"/>
        <FIELD NAME="lang" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" ENUM="false" PREVIOUS="course"/>
      </FIELDS>
      <KEYS>
        <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="chatid"/>
        <KEY NAME="chatid" TYPE="foreign" FIELDS="chatid" REFTABLE="chat" REFFIELDS="id" PREVIOUS="primary"/>
      </KEYS>
      <INDEXES>
        <INDEX NAME="userid" UNIQUE="false" FIELDS="userid" NEXT="lastping"/>
        <INDEX NAME="lastping" UNIQUE="false" FIELDS="lastping" PREVIOUS="userid" NEXT="groupid"/>
        <INDEX NAME="groupid" UNIQUE="false" FIELDS="groupid" PREVIOUS="lastping"/>
      </INDEXES>
    </TABLE>
  </TABLES>
  <STATEMENTS>
    <STATEMENT NAME="insert log_display" TYPE="insert" TABLE="log_display" COMMENT="Initial insert of records on table log_display">
      <SENTENCES>
        <SENTENCE TEXT="(module, action, mtable, field) VALUES ('chat', 'view', 'chat', 'name')" />
        <SENTENCE TEXT="(module, action, mtable, field) VALUES ('chat', 'add', 'chat', 'name')" />
        <SENTENCE TEXT="(module, action, mtable, field) VALUES ('chat', 'update', 'chat', 'name')" />
        <SENTENCE TEXT="(module, action, mtable, field) VALUES ('chat', 'report', 'chat', 'name')" />
        <SENTENCE TEXT="(module, action, mtable, field) VALUES ('chat', 'talk', 'chat', 'name')" />
      </SENTENCES>
    </STATEMENT>
  </STATEMENTS>
</XMLDB>
