db.py 文件源码

def delete(self, table, where, using=None, vars=None, _test=False): 
        """
        Deletes from `table` with clauses `where` and `using`.

            >>> db = DB(None, {})
            >>> name = 'Joe'
            >>> db.delete('foo', where='name = $name', vars=locals(), _test=True)
            <sql: "DELETE FROM foo WHERE name = 'Joe'">
        """
        if vars is None: vars = {}
        where = self._where(where, vars)

        q = 'DELETE FROM ' + table
        if using: q += ' USING ' + sqllist(using)
        if where: q += ' WHERE ' + where

        if _test: return q

        db_cursor = self._db_cursor()
        self._db_execute(db_cursor, q)
        if not self.ctx.transactions: 
            self.ctx.commit()
        return db_cursor.rowcount