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