* finish task #2418.

2015-11-24 12:07:39 +08:00
parent 715050df57
commit 2aba28b253
1 changed files with 14 additions and 0 deletions
--- a/lib/dao/dao.class.php
+++ b/lib/dao/dao.class.php
@@ -428,6 +428,20 @@ class dao
        echo $this->processSQL();
    }

+    /**
+     * Explain sql. 
+     * 
+     * @param  string $sql 
+     * @access public
+     * @return void
+     */
+    public function explain($sql = '')
+    {
+        $sql    = empty($sql) ? $this->processSQL() : $sql;
+        $result = $this->dbh->query('explain ' . $sql)->fetch();
+        a($result);
+    }
+
    /**
     * Process the sql, replace the table, fields.
     *