apps.py 文件源码

def activate_pragmas_on_start():
        """
        Activate a set of PRAGMAs that apply to the database itself,
        and not on a per connection basis.
        :return:
        """
        from django.db import connection

        if connection.vendor == "sqlite":
            cursor = connection.cursor()

            # http://www.sqlite.org/wal.html
            # WAL's main advantage allows simultaneous reads
            # and writes (vs. the default exclusive write lock)
            # at the cost of a slight penalty to all reads.
            cursor.execute(START_PRAGMAS)