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import time
from debug_toolbar.panels import DebugPanel
from django.db import connection
from django.db.backends import util
from django.template.loader import render_to_string
class DatabaseStatTracker(util.CursorDebugWrapper):
"""
Replacement for CursorDebugWrapper which stores additional information
in `connection.queries`.
"""
def execute(self, sql, params=()):
start = time.time()
try:
return self.cursor.execute(sql, params)
finally:
stop = time.time()
# We keep `sql` to maintain backwards compatibility
self.db.queries.append({
'sql': self.db.ops.last_executed_query(self.cursor, sql, params),
'time': stop - start,
'raw_sql': sql,
'params': params,
})
util.CursorDebugWrapper = DatabaseStatTracker
class SQLDebugPanel(DebugPanel):
"""
Panel that displays information about the SQL queries run while processing the request.
"""
name = 'SQL'
has_content = True
def __init__(self, request):
super(SQLDebugPanel, self).__init__(request)
self._offset = len(connection.queries)
self._sql_time = 0
def title(self):
self._sql_time = sum(map(lambda q: float(q['time']) * 1000, connection.queries))
return '%d SQL Queries (%.2fms)' % (len(connection.queries), self._sql_time)
def url(self):
return ''
def content(self):
sql_queries = connection.queries[self._offset:]
for query in sql_queries:
query['sql'] = reformat_sql(query['sql'])
context = {
'queries': sql_queries,
'sql_time': self._sql_time,
}
return render_to_string('debug_toolbar/panels/sql.html', context)
def reformat_sql(sql):
sql = sql.replace('`,`', '`, `')
sql = sql.replace('` FROM `', '` \n FROM `')
sql = sql.replace('` WHERE ', '` \n WHERE ')
sql = sql.replace('` INNER JOIN ', '` \n INNER JOIN ')
sql = sql.replace('` OUTER JOIN ', '` \n OUTER JOIN ')
sql = sql.replace(' ORDER BY ', ' \n ORDER BY ')
return sql
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