Adding view to explain SQL passed in via query string. Hopefully this is

database backend agnostic.  Next up is connecting this with the SQL panel via
AJAX.

1 files changed, 30 insertions, 0 deletions

diff --git a/debug_toolbar/views.py b/debug_toolbar/views.py
new file mode 100644
index 0000000..5bdf450
--- /dev/null
+++ b/debug_toolbar/views.py
@@ -0,0 +1,30 @@
+import simplejson
+from django.db import connection
+from django.shortcuts import render_to_response
+from debug_toolbar.panels.sql import reformat_sql
+
+def explain(request):
+    """
+    Returns the output of the SQL EXPLAIN on the given query.
+    
+    Expected GET variables:
+        sql: urlencoded sql with position arguments
+        params: JSON encoded parameter values
+        time: time for SQL to execute passed in from toolbar just for redisplay
+    """
+    sql = request.GET.get('sql', '')
+    if sql.lower().startswith('select'):
+        params = simplejson.loads(request.GET.get('params', ''))
+        cursor = connection.cursor()
+        cursor.execute("EXPLAIN %s" % (sql,), params)
+        headers = [d[0] for d in cursor.description]
+        result = cursor.fetchall()
+        cursor.close()
+        context = {
+            'result': result,
+            'sql': reformat_sql(cursor.db.ops.last_executed_query(cursor, sql, params)),
+            'time': request.GET.get('time', 0.0),
+            'headers': headers,
+        }
+        return render_to_response('debug_toolbar/panels/sql_explain.html', context)
+        
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