Make dbversion a method of Database

We currently don't actually use it, but it might come in handy, so let's
keep it.

2 files changed, 20 insertions, 27 deletions

diff --git a/ratatoeskr/sys/Database.php b/ratatoeskr/sys/Database.php
index 4f9014a..d9fc327 100644
--- a/ratatoeskr/sys/Database.php
+++ b/ratatoeskr/sys/Database.php
@@ -110,4 +110,24 @@ class Database
     {
         return (int)$this->pdo->lastInsertId();
     }
+
+    /**
+     * Get the version of the database structure currently used.
+     * @return int
+     */
+    public function dbversion(): int
+    {
+        $tableName = $this->subPrefix("PREFIX_meta");
+
+        /* Is the meta table present? If no, the version is 0. */
+        $stmt = $this->query("SHOW TABLES LIKE ?", $tableName);
+        list($table) = $stmt->fetch();
+        if ($table != $tableName) {
+            return 0;
+        }
+
+        $stmt = $this->query("SELECT `value` FROM `PREFIX_meta` WHERE `key` = 'dbversion'");
+        $sqlrow = $stmt->fetch();
+        return (int)unserialize(base64_decode($sqlrow["value"]));
+    }
 }
diff --git a/ratatoeskr/sys/models.php b/ratatoeskr/sys/models.php
index b24345f..01ffeb3 100644
--- a/ratatoeskr/sys/models.php
+++ b/ratatoeskr/sys/models.php
@@ -3173,33 +3173,6 @@ class ArticleExtradata extends KVStorage
 }
 
 /*
- * Function: dbversion
- * Get the version of the database structure currently used.
- *
- * Returns:
- *  The numerical version of the current database structure.
- */
-function dbversion()
-{
-    global $config;
-
-    /* Is the meta table present? If no, the version is 0. */
-    $stmt = qdb(
-        "SELECT COUNT(*) FROM `information_schema`.`tables` WHERE `table_schema` = ? AND `table_name` = ?",
-        $config["mysql"]["db"],
-        sub_prefix("PREFIX_meta")
-    );
-    list($n) = $stmt->fetch();
-    if ($n == 0) {
-        return 0;
-    }
-
-    $stmt = qdb("SELECT `value` FROM `PREFIX_meta` WHERE `key` = 'dbversion'");
-    $sqlrow = $stmt->fetch();
-    return unserialize(base64_decode($sqlrow["value"]));
-}
-
-/*
  * Function: clean_database
  * Clean up the database
  */