python - 将环境更改为 os x 时出现 Python psycopg2 错误

Question

执行以下任务时出现此错误，

results = db1.executeSelectCommand(siteSql, (),) TypeError: unbound method executeSelectCommand() must be called with dbConnn instance as the first argument (得到 str 实例)

我的代码如下：

class dbConnn:
    db_con  = None
    execfile("/Users/usera/Documents/workspace/testing/src/db/db_config.py")

    def executeSelectCommand(self,sql,ip):
        #psycopg connection here.

我在这里使用这个类：

from db import dbConnections

db1 = dbConnections.dbConnn

siteSql = 'select post_content from post_content_ss order by RANDOM() limit 500' #order by year,month ASC'
results = db1.executeSelectCommand(siteSql, (),)

在windows中，似乎没有这个问题？上帝，它一定很初级，但我找不到。

Answer 1

db1 = dbConnections.dbConnn

在这里，您将类 dbConn分配给变量db1。您可能想创建一个新实例：

db1 = dbConnections.dbConnn()