Adding query profiling for MySQL. Thanks to Simon Willison for the suggestion.

There's a big TODO on this one, which is to not display or attempt to execute
the profiling SQL calls if this isn't MySQL and if MySQL isn't >= version
5.0.37.  For now it's a nice playground of the profiler if you have MySQL
v5.0.37 or higher.

4 files changed, 63 insertions, 0 deletions

diff --git a/debug_toolbar/templates/debug_toolbar/panels/sql.html b/debug_toolbar/templates/debug_toolbar/panels/sql.html
index 2abb68f..d35d83e 100644
--- a/debug_toolbar/templates/debug_toolbar/panels/sql.html
+++ b/debug_toolbar/templates/debug_toolbar/panels/sql.html
@@ -15,6 +15,7 @@
 				{% if query.params %}
 					<a class="remoteCall" href="/__debug__/sql_select/?sql={{ query.raw_sql|urlencode }}&params={{ query.params|urlencode }}&time={{ query.time|floatformat:"4"|urlencode }}&hash={{ query.hash }}">SELECT</a>
 					<a class="remoteCall" href="/__debug__/sql_explain/?sql={{ query.raw_sql|urlencode }}&params={{ query.params|urlencode }}&time={{ query.time|floatformat:"4"|urlencode }}&hash={{ query.hash }}">EXPLAIN</a>
+					<a class="remoteCall" href="/__debug__/sql_profile/?sql={{ query.raw_sql|urlencode }}&params={{ query.params|urlencode }}&time={{ query.time|floatformat:"4"|urlencode }}&hash={{ query.hash }}">PROFILE</a>
 				{% endif %}
 				</td>
 				<td class="syntax">{{ query.sql|safe }}</td>
diff --git a/debug_toolbar/templates/debug_toolbar/panels/sql_profile.html b/debug_toolbar/templates/debug_toolbar/panels/sql_profile.html
new file mode 100644
index 0000000..c1d04ce
--- /dev/null
+++ b/debug_toolbar/templates/debug_toolbar/panels/sql_profile.html
@@ -0,0 +1,26 @@
+<a class="back" href="">&laquo;&nbsp;Back</a>
+<h3>SQL Profiled</h3>
+<dl>
+	<dt>Executed SQL</dt>
+	<dd><pre>{{ sql|safe }}</pre></dd>
+	<dt>Time</dt>
+	<dd>{{ time }} ms</dd>
+</dl>
+<table>
+	<thead>
+		<tr>
+			{% for h in headers %}
+				<th>{{ h|upper }}</th>
+			{% endfor %}
+		</tr>
+	</thead>
+	<tbody>
+		{% for row in result %}
+			<tr class="{% cycle 'odd' 'even' %}">
+				{% for column in row %}
+					<td>{{ column|escape }}</td>
+				{% endfor %}
+			</tr>
+		{% endfor %}
+	</tbody>
+</table>
diff --git a/debug_toolbar/urls.py b/debug_toolbar/urls.py
index 437d36b..53a426b 100644
--- a/debug_toolbar/urls.py
+++ b/debug_toolbar/urls.py
@@ -11,4 +11,5 @@ urlpatterns = patterns('',
     url(r'^__debug__/m/(.*)$', 'debug_toolbar.views.debug_media'),
     url(r'^__debug__/sql_select/$', 'debug_toolbar.views.sql_select', name='sql_select'),
     url(r'^__debug__/sql_explain/$', 'debug_toolbar.views.sql_explain', name='sql_explain'),
+    url(r'^__debug__/sql_profile/$', 'debug_toolbar.views.sql_profile', name='sql_profile'),
 )
diff --git a/debug_toolbar/views.py b/debug_toolbar/views.py
index 4b666e1..8af879f 100644
--- a/debug_toolbar/views.py
+++ b/debug_toolbar/views.py
@@ -81,3 +81,38 @@ def sql_explain(request):
             'headers': headers,
         }
         return render_to_response('debug_toolbar/panels/sql_explain.html', context)
+
+def sql_profile(request):
+    """
+    Returns the output of running the SQL and getting the profiling statistics.
+
+    Expected GET variables:
+        sql: urlencoded sql with positional arguments
+        params: JSON encoded parameter values
+        time: time for SQL to execute passed in from toolbar just for redisplay
+        hash: the hash of (secret + sql + params) for tamper checking
+    """
+    from debug_toolbar.panels.sql import reformat_sql
+    sql = request.GET.get('sql', '')
+    params = request.GET.get('params', '')
+    hash = sha_constructor(settings.SECRET_KEY + sql + params).hexdigest()
+    if hash != request.GET.get('hash', ''):
+        return HttpResponse('<h3>Tamper alert</h3>') # SQL Tampering alert
+    if sql.lower().startswith('select'):
+        params = simplejson.loads(params)
+        cursor = connection.cursor()
+        cursor.execute("SET PROFILING=1") # Enable profiling
+        cursor.execute(sql, params) # Execute SELECT
+        cursor.execute("SET PROFILING=0") # Disable profiling
+        # The Query ID should always be 1 here but I'll subselect to get the last one just in case...
+        cursor.execute("SELECT * FROM information_schema.profiling WHERE query_id=(SELECT query_id FROM information_schema.profiling ORDER BY query_id DESC LIMIT 1)")
+        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)