如何在将oracle nextval分配给数据库中的某一行后立即将其检索到变量中 [英] How to retrieve oracle nextval into variable right after it is assigned to some row in database

问题描述

大家好，



我要做的是为用户创建的查询生成唯一ID。



我使用oracle序列来分配查询ID，这是表中的主键。



创建查询后，我想显示查询ID已创建，基本上是序列号。



谢谢.. !!



< b>我尝试了什么：



首先，显示sequence.currval并不能保证正确的输出，因为在那段时间内其他用户可以将查询插入到数据库中。



其次，如果我选择x用户正确创建的id，那可能会有效。但这需要解雇另一个查询。



还有其他办法吗？

Hi Everyone,

What I am trying to do is to generate unique ids for queries created by users.

I am using oracle sequence to assign the query id, which is primary key in the table.

After creating the query, I want to display the query id created, which is basically the sequence no.

Thank you..!!

What I have tried:

Firstly, displaying the sequence.currval will not guarantee right outpput because within that time other user can insert query into database.

Secondly, if I select the id that is created by x user exactly at y time, that might work. But that requires another query to be fired.

Is there any alternative way?

推荐答案

您可以使用return子句来做到这一点。



示例：

Hi,

You can use the returning clause to do that.

Example:

INSERT INTO {query_table} (query_id, query)
   VALUES (sequence.nextval, query_From_User)
RETURNING query_id into {a_defined_variable}

这将为您提供插入记录的ID。

This will give you the id of the inserted record.

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