我正在使用Postgres SQL数据库开发Django项目。我写了一个在postgres sql查询上运行完美的商店procdure。
现在我想从django 1.5调用该存储过程..我已经编写了代码,但它会提示错误。
CREATE FUNCTION fn_save_message3(IN msg_sub character varying, IN msg_cont text, IN msg_type character varying, IN msg_category character varying, IN msg_created_by character varying, IN msg_updated_by character varying) RETURNS integer AS
$BODY$ DECLARE msg_id integer := 0;
BEGIN
INSERT INTO tbl_messages
(message_subject, message_content, message_type, message_category,
created_on, created_by, updated_on, updated_by)
VALUES
(msg_sub, msg_cont, msg_type, msg_category, LOCALTIMESTAMP,
msg_created_by, LOCALTIMESTAMP, msg_updated_by);
Select into msg_id currval('tbl_messages_message_id_seq');
return msg_id;
END;$BODY$
LANGUAGE plpgsql VOLATILE NOT LEAKPROOF
COST 100;
ALTER FUNCTION public.fn_save_message(IN character varying, IN text, IN character varying, IN character varying, IN character varying, IN character varying)
OWNER TO gljsxdlvpgfvui;
存储过程正常,它返回结果。
c = connection.cursor()
try:
c.execute("BEGIN")
c.callproc("fn_save_message", [Message_Subject, Message_Content, Message_Type, Message_Category, Created_By, updated_by])
results = c.fetchone()
c.execute("COMMIT")
finally:
c.close()
print results
根据你的所有建议,我的计划终于有效了。但还有一个小问题。
因为我使用results = c.fetchone()
来获取out参数。
它返回(13,)
但我只想将 13 作为字符串或整数,我怎样才能获得该值。
更新
使用此
解决问题for item in results:
message_id = item
答案 0 :(得分:4)
c = connection.cursor()
try:
c.execute("BEGIN")
c.callproc("fn_save_message3", (Message_Subject, Message_Content, Message_Type, Message_Category, Created_By, Updated_By))
results = c.fetchall()
c.execute("COMMIT")
finally:
c.close()
print results
你忘记了关闭的parens并试图调用cursor
上的函数而不是c
,并且还有缩进问题。您还应该使用记录为here.
callproc()
函数
正如catavaran所说,您应该阅读有关执行自定义SQL的文档并使用占位符。此外,在Django 1.6+中,事务会自动提交,因此不需要c.execute("COMMIT")
答案 1 :(得分:1)
c = connection.cursor()
try:
c.execute("BEGIN")
c.callproc("fn_save_message3", [Message_Subject, Message_Content, Message_Type, Message_Category, Created_By, updated_by])
results = c.fetchone()
c.execute("COMMIT")
finally:
c.close()
for item in results:
message_id = item
答案 2 :(得分:0)
c.execute("SELECT fn_save_message3(...
行缺少右括号。在最后一个引号后添加)
。
但无论如何,这是从python代码执行SQL的错误方法。您应该使用占位符来防止SQL注入攻击。 Read the documentation以及在django中正确使用SQL的示例。