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<?php
/* MySQL database backend
(Glue between Moodle and ewiki Database)
Adapted by Michael Schneider
*/
defined('MOODLE_INTERNAL') || die();
/// Glue
$ewiki_plugins["database"][0] = "ewiki_database_moodle";
/// #-- predefine some of the configuration constants
//define("EWIKI_NAME", $wiki_entry->pagename); COMMENTED BY PIGUI BECOUSE OF MIGRATION
define("EWIKI_CONTROL_LINE", 0);
define("EWIKI_LIST_LIMIT", 25);
//define("EWIKI_DEFAULT_LANG", current_language()); COMMENTED BY PIGUI BECOUSE OF MIGRATION
define("EWIKI_HTML_CHARS", 1);
define("EWIKI_DB_TABLE_NAME", "wiki_pages_old");
function ewiki_database_moodle($action, &$args, $sw1, $sw2) {
global $wiki, $wiki_entry, $CFG, $DB;
#-- 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":
$params = array('id'=>$args["id"]);
if ($version = 0 + @$args["version"]) {
$params['version'] = $version;
$versionsql = "AND version = :version";
} else {
$versionsql = "";
}
# $result = mysql_query("SELECT * FROM " . EWIKI_DB_TABLE_NAME
# . " WHERE (pagename=$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= :weid $versionsql ";
$params['weid'] = $wiki_entry->id;
$sort="version DESC";
if ($result_arr = $DB->get_records_select(EWIKI_DB_TABLE_NAME, $select, $params, $sort,"*",0,1)) {
//Iterate to get the first (and unique!)
foreach ($result_arr as $obj) {
$result_obj = $obj;
}
}
if($result_obj) {
//Convert to array
$r=get_object_vars($result_obj);
$r["id"] = $r["pagename"];
unset($r["pagename"]);
$r["meta"] = @unserialize($r["meta"]);
}
break;
/* Increases the hit counter for the page name given in $args array
with "id" index key.
*/
case "HIT":
#mysql_query("UPDATE " . EWIKI_DB_TABLE_NAME . " SET hits=(hits+1) WHERE pagename='" . anydb_escape_string($args["id"]) . "'");
# $DB->set_field does not work because of the "hits+1" construct
#print "DO ".anydb__escape_string($args["id"]); exit;
$DB->execute("UPDATE {".EWIKI_DB_TABLE_NAME."} SET hits=(hits+1) WHERE pagename=? and wiki=?", array($args["id"], $wiki_entry->id));
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 .= $a . "'" . anydb_escape_string($value) . "'";
#}
#strlen(@$COMMAND) || ($COMMAND = "INSERT");
foreach ($args as $index => $value) {
if (is_int($index)) {
continue;
}
$args[$index] =anydb_escape_string($value);
}
$args["wiki"]=$wiki_entry->id;
# Check if Record exists
if($COMMAND=="REPLACE") {
if ($DB->count_records(EWIKI_DB_TABLE_NAME, array("wiki"=>$wiki_entry->id,"pagename"=>$args["pagename"],"version"=>$args["version"]))) {
$DB->delete_record(EWIKI_DB_TABLE_NAME, array("wiki"=>$wiki_entry->id,"pagename"=>$args["pagename"],"version"=>$args["version"]));
}
}
# Write
$result=$DB->insert_record(EWIKI_DB_TABLE_NAME,(object)$args,false);
#$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 = "";
$params = array();
$p=0;
foreach (array_values($args) as $id) {
if (strlen($id)) {
$p++;
$pname = "par$p";
$r[$id] = 0;
$select .= ($select ? " OR " : "") .
"(pagename= :$pname)";
$params[$pname] = $id;
}
}
if($select) {
$select = "(".$select.") AND wiki= :weid ";
$params['weid'] = $wiki_entry->id;
$result = $DB->get_records_select(EWIKI_DB_TABLE_NAME,$select, $params);
while(list($key, $val) = @each($result)) {
$r[$val->pagename]=strpos($val->meta, 's:5:"image"') ? $val->meta : 1;
}
}
break;
/* Counts the number of Versions
*/
case "COUNTVERSIONS":
$sql= "SELECT pagename AS id, count(*) as versioncount".
" FROM {".EWIKI_DB_TABLE_NAME."}
WHERE wiki = ?".
" GROUP BY pagename";
#print "$sql";
$result=$DB->get_records_sql($sql, array($wiki_entry->id));
while(list($key, $val) = each($result)) {
$r[$key]=$val->versioncount;
}
break;
/* Returns an array of the lastest versions of __all__ pages,
where each entry is made up of the fields from the database
requested with the $args array, e.g.
array("flags","meta","lastmodified");
*/
case "GETALL":
switch ($DB->get_dbfamily()) {
case 'postgres':
// All but the latest version eliminated by DISTINCT
// ON (pagename)
$sql= "SELECT DISTINCT ON (pagename) pagename AS id, ".
implode(", ", $args) .
" FROM {".EWIKI_DB_TABLE_NAME."}".
" WHERE wiki = ?".
" ORDER BY pagename, version DESC";
break;
case 'mysql':
// All but the latest version eliminated by
// mysql-specific GROUP BY-semantics
$sql= "SELECT pagename AS id, ".
implode(", ", $args) .
" FROM {".EWIKI_DB_TABLE_NAME."}".
" WHERE wiki = ?".
" GROUP BY id, version DESC " ;
default:
// All but the latest version are here eliminated in
// $DB->get_records_sql, since it will return an array
// with only one result per id-field value. Note,
// that for this to work the query needs to order the
// records ascending by version, so later versions
// will overwrite previous ones in
// recordset_to_array. This is not pretty.
$sql= "SELECT pagename AS id, ".
implode(", ", $args) .
" FROM {".EWIKI_DB_TABLE_NAME."}".
" WHERE wiki = ?".
" ORDER BY version";
}
$result = $DB->get_records_sql($sql, array($wiki_entry->id));
$r = new ewiki_dbquery_result($args);
if ($result) {
foreach($result as $val) {
$r->add(get_object_vars($val));
}
}
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"; }
$sql= "SELECT pagename AS id, version, flags" .
(EWIKI_DBQUERY_BUFFER && ($field!="pagename") ? ", $field" : "") .
" FROM {".EWIKI_DB_TABLE_NAME."}".
" WHERE " . $DB->sql_like($field, '?', false) . " and wiki= ?".
" ORDER BY id, version ASC";
$result=$DB->get_records_sql($sql, array("%$content%", $wiki_entry->id));
$r = new ewiki_dbquery_result(array("id","version",$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 = $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";
$DB->delete_records(EWIKI_DB_TABLE_NAME, array("wiki"=>$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($r);
}
function anydb_escape_string($s) {
return($s);
}
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