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<?php
/* MySQL database backend
(Glue between Moodle and ewiki Database)
Adapted by Michael Schneider
*/
/// Glue
$ewiki_plugins["database"][0] = "ewiki_database_moodle";
/// #-- predefine some of the configuration constants
define("EWIKI_NAME", $wiki_entry->pagename);
define("EWIKI_CONTROL_LINE", 0);
define("EWIKI_LIST_LIMIT", 25);
define("EWIKI_DEFAULT_LANG", current_language());
define("EWIKI_HTML_CHARS", 1);
define("EWIKI_DB_TABLE_NAME", "wiki_pages");
function ewiki_database_moodle($action, &$args, $sw1, $sw2) {
global $wiki, $wiki_entry, $CFG;
#-- result array
$r = array();
switch($action) {
/* Returns database entry as array for the page whose name was given
with the "id" key in the $args array, usually fetches the latest
version of a page, unless a specific "version" was requested in
the $args array.
*/
# Ugly, but we need to choose which wiki we are about to change/read
case "GET":
$id = "'" . mysql_escape_string($args["id"]) . "'";
($version = 0 + @$args["version"]) and ($version = "AND (version=$version)") or ($version="");
# $result = mysql_query("SELECT * FROM " . EWIKI_DB_TABLE_NAME
# . " WHERE (pagename=$id) $version ORDER BY version DESC LIMIT 1"
#);
#if ($result && ($r = mysql_fetch_array($result, MYSQL_ASSOC))) {
# $r["id"] = $r["pagename"];
# unset($r["pagename"]);
#}
#if (strlen($r["meta"])) {
# $r["meta"] = @unserialize($r["meta"]);
#}
$select="(pagename=$id) AND wiki=".$wiki_entry->id." $version ";
$sort="version DESC";
$result_obj=get_records_select(EWIKI_DB_TABLE_NAME, $select,$sort,"*",0,1);
if($result_obj) {
$r=get_object_vars($result_obj[$args["id"]]);
$r["id"] = $r["pagename"];
unset($r["pagename"]);
$r["meta"] = @unserialize($r["meta"]);
}
break;
/* Increases the hit counter for the page name given in $args array
with "id" index key.
*/
case "HIT":
#mysql_query("UPDATE " . EWIKI_DB_TABLE_NAME . " SET hits=(hits+1) WHERE pagename='" . mysql_escape_string($args["id"]) . "'");
# set_field does not work because of the "hits+1" construct
#print "DO ".mysql_escape_string($args["id"]); exit;
execute_sql("UPDATE " .$CFG->prefix.EWIKI_DB_TABLE_NAME . " SET hits=(hits+1) WHERE pagename='" . mysql_escape_string($args["id"]) . "' and wiki=".$wiki_entry->id, 0);
break;
/* Stores the $data array into the database, while not overwriting
existing entries (using WRITE); returns 0 on failure and 1 if
saved correctly.
*/
case "OVERWRITE":
$COMMAND = "REPLACE";
break;
case "WRITE":
$COMMAND="WRITE";
$args["pagename"] = $args["id"];
unset($args["id"]);
if (is_array($args["meta"])) {
$args["meta"] = serialize($args["meta"]);
}
#$sql1 = $sql2 = "";
#foreach ($args as $index => $value) {
# if (is_int($index)) {
# continue;
# }
# $a = ($sql1 ? ', ' : '');
# $sql1 .= $a . $index;
# $sql2 .= $a . "'" . mysql_escape_string($value) . "'";
#}
#strlen(@$COMMAND) || ($COMMAND = "INSERT");
foreach ($args as $index => $value) {
if (is_int($index)) {
continue;
}
$args[$index] =mysql_escape_string($value);
}
$args["wiki"]=$wiki_entry->id;
# Check if Record exists
if($COMMAND=="REPLACE") {
if(count_records(EWIKI_DB_TABLE_NAME,"wiki", $wiki_entry->id,"pagename",$args["pagename"],"version",$args["version"])) {
delete_record(EWIKI_DB_TABLE_NAME,"wiki", $wiki_entry->id,"pagename",$args["pagename"],"version",$args["version"]);
}
}
# Write
$result=insert_record(EWIKI_DB_TABLE_NAME,$args,false,"pagename");
#$result = mysql_query("$COMMAND INTO " . EWIKI_DB_TABLE_NAME .
# " (" . $sql1 . ") VALUES (" . $sql2 . ")"
#);
#return($result && mysql_affected_rows() ?1:0);
return $result;
break;
/* Checks for existence of the WikiPages whose names are given in
the $args array. Returns an array with the specified WikiPageNames
associated with values of "0" or "1" (stating if the page exists
in the database). For images/binary db entries returns the "meta"
field instead of an "1".
*/
case "FIND":
$select = "";
foreach (array_values($args) as $id) {
if (strlen($id)) {
$r[$id] = 0;
$select .= ($select ? " OR " : "") .
"(pagename='" . mysql_escape_string($id) . "')";
}
}
if($select) {
$select = "(".$select.") AND wiki=".$wiki_entry->id;
$result = get_records_select(EWIKI_DB_TABLE_NAME,$select);
#$sql = "SELECT pagename AS id, meta FROM " .
# EWIKI_DB_TABLE_NAME . " WHERE $sql "
#);
#while ($result && ($row = mysql_fetch_row($result))) {
# $r[$row[0]] = strpos($row[1], 's:5:"image"') ? $row[1] : 1;
while(list($key, $val) = @each($result)) {
$r[$val->pagename]=strpos($val->meta, 's:5:"image"') ? $val->meta : 1;
}
}
break;
/* Counts the number of Versions
*/
case "COUNTVERSIONS":
$sql= "SELECT pagename AS id, count(*) as versioncount".
" FROM ". $CFG->prefix.EWIKI_DB_TABLE_NAME .
" WHERE wiki = ".$wiki_entry->id.
" GROUP BY id";
#print "$sql";
$result=get_records_sql($sql);
while(list($key, $val) = each($result)) {
$r[$key]=$val->versioncount;
}
break;
/* Returns an array of __all__ pages, where each entry is made up
of the fields from the database requested with the $args array,
e.g. array("flags","meta","lastmodified");
*/
case "GETALL":
#$result = mysql_query("SELECT pagename AS id, ".
# implode(", ", $args) .
# " FROM ". EWIKI_DB_TABLE_NAME .
# " GROUP BY id, version DESC"
#);
$sql= "SELECT pagename AS id, ".
implode(", ", $args) .
" FROM ". $CFG->prefix.EWIKI_DB_TABLE_NAME .
" WHERE wiki = ".$wiki_entry->id.
" GROUP BY id, version";
#print "$sql";
$result=get_records_sql($sql);
$r = new ewiki_dbquery_result($args);
$drop = "";
#while ($result && ($row = mysql_fetch_array($result, MYSQL_ASSOC))) {
# $i = EWIKI_CASE_INSENSITIVE ? strtolower($row["id"]) : $row["id"];
# if ($i != $drop) {
# $drop = $i;
# $r->add($row);
# }
#}
#print "<pre>"; print_r($result); print "</pre>";
if(!$result) {
$result=array();
}
while(list($key, $val) = each($result)) {
$row=get_object_vars($val);
$i = EWIKI_CASE_INSENSITIVE ? strtolower($row["id"]) : $row["id"];
if ($i != $drop) {
$drop = $i;
$r->add($row);
}
}
break;
/* Returns array of database entries (also arrays), where the one
specified column matches the specified content string, for example
$args = array("content" => "text...piece")
is not guaranteed to only search/return the latest version of a page
*/
case "SEARCH":
$field = implode("", array_keys($args));
$content = strtolower(implode("", $args));
if ($field == "id") { $field = "pagename"; }
#$result = mysql_query("SELECT pagename AS id, version, flags" .
# (EWIKI_DBQUERY_BUFFER && ($field!="pagename") ? ", $field" : "") .
# " FROM " . EWIKI_DB_TABLE_NAME .
# " WHERE LOCATE('" . mysql_escape_string($content) . "', LCASE($field)) " .
# " GROUP BY id, version DESC"
#);
$sql= "SELECT pagename AS id, version, flags" .
(EWIKI_DBQUERY_BUFFER && ($field!="pagename") ? ", $field" : "") .
" FROM " . $CFG->prefix.EWIKI_DB_TABLE_NAME .
" WHERE LOCATE('" . mysql_escape_string($content) . "', LCASE($field)) and wiki=".$wiki_entry->id .
" GROUP BY id, version DESC";
$result=get_records_sql($sql);
$r = new ewiki_dbquery_result(array("id","version",$field));
$drop = "";
#while ($result && ($row = mysql_fetch_array($result, MYSQL_ASSOC))) {
# $i = EWIKI_CASE_INSENSITIVE ? strtolower($row["id"]) : $row["id"];
# if ($i != $drop) {
# $drop = $i;
# $r->add($row);
# }
#}
while(list($key, $val) = @each($result)) {
$row=get_object_vars($val);
$i = EWIKI_CASE_INSENSITIVE ? strtolower($row["id"]) : $row["id"];
if ($i != $drop) {
$drop = $i;
$r->add($row);
}
}
break;
case "DELETE":
$id = mysql_escape_string($args["id"]);
$version = $args["version"];
#mysql_query("DELETE FROM " . EWIKI_DB_TABLE_NAME ."
# WHERE pagename='$id' AND version=$version");
# print "DELETING wiki:".$wiki_entry->id."Pagename: $id Version: $version <br>\n";
delete_records(EWIKI_DB_TABLE_NAME,"wiki", $wiki_entry->id,"pagename",$id,"version",$version);
break;
case "INIT":
#mysql_query("CREATE TABLE " . EWIKI_DB_TABLE_NAME ."
# (pagename VARCHAR(160) NOT NULL,
# version INTEGER UNSIGNED NOT NULL DEFAULT 0,
# flags INTEGER UNSIGNED DEFAULT 0,
# content MEDIUMTEXT,
# author VARCHAR(100) DEFAULT 'ewiki',
# created INTEGER UNSIGNED DEFAULT ".time().",
# lastmodified INTEGER UNSIGNED DEFAULT 0,
# refs MEDIUMTEXT,
# meta MEDIUMTEXT,
# hits INTEGER UNSIGNED DEFAULT 0,
# PRIMARY KEY id (pagename, version) )
# ");
#echo mysql_error();
break;
default:
}
return($r);
}
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