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如何在触发器中检测预备事务

[英]How to detect a Prepared Transaction inside a trigger

原文 2013-01-22 08:05:06 7 1 postgresql/ transactions/ postgresql-9.2

I have a problem with existing database code (a trigger) that call a function trigger that use the NOTIFY command, which is not supported in the context of a prepared transaction . 我现有的数据库代码（触发器）有问题，这些代码调用使用NOTIFY命令的函数触发器，这在准备好的事务的上下文中不受支持。

My question is simple : from the function trigger, is there a way to detect that we are in the context of a prepared transaction ? 我的问题很简单：从函数触发器中，有没有一种方法可以检测到我们处于准备好的事务中？

Thanks in advance. 提前致谢。

1 个解决方案

There is no way to detect that the current transaction will be committed using prepared transactions and two-phase commit, because you haven't PREPARE d the transaction yet; 有没有办法来检测使用准备好的事务和两阶段提交，目前的交易将被提交，因为你没有PREPARE尚未d交易; the transaction has no idea it's going to be subjected to two-phase commit until after your trigger runs. 事务不知道它将执行两阶段提交，直到触发器运行之后。 PostgreSQL doesn't require that you BEGIN TRANSACTION FOR TWO PHASE COMMIT (imaginary syntax) or anything like that. PostgreSQL不需要您开始进行BEGIN TRANSACTION FOR TWO PHASE COMMIT （虚构语法）或类似的BEGIN TRANSACTION FOR TWO PHASE COMMIT 。

You can test for max_prepared_transactions > 0 in pg_settings to see if prepared transactions are enabled , but there's no way to know if 2PC will be used until it happens. 您可以在pg_settings测试max_prepared_transactions > 0来查看是否启用了准备好的事务，但是直到发生2PC之前，您无法知道是否将使用2PC。

在触发器内执行动态准备语句 - Execute dynamic prepared statement inside a trigger

如何从执行的预准备语句中获取$ 1参数的值（使用current_query（）在触发器内） - How to get value of $1 parameter from executed prepared statement (inside a trigger using a current_query())

如何避免为准备好的语句的每一行启动触发器？ - How to avoid launching a trigger for every row of a prepared statement?

触发器内部的 PERFORM 是否在与调用者相同的事务中执行 function？ - Does PERFORM inside of a trigger execute a function in the same transaction as the caller?

错误：postgresql 中不存在准备好的事务 - ERROR: prepared transaction does not exist in postgresql

PostgreSQL。缓慢准备交易并提交准备 - PostgreSQL. Slow Prepare Transaction and Commit Prepared

如何在事务中获取SELECT语句的结果？ - How to get the result of SELECT statement inside a transaction?

触发错误时回滚事务 - Rollback Transaction on Trigger ERROR

Postgresql 触发/交易行为 - Postgresql Trigger / Transaction Behaviour

如何检测 PostgreSQL slave 是否与 master 上的已知事务一致？ - How to detect if a PostgreSQL slave is consistent up to a known transaction on the master?

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相关问题 在触发器内执行动态准备语句 - Execute dynamic prepared statement inside a trigger 如何从执行的预准备语句中获取$ 1参数的值（使用current_query（）在触发器内） - How to get value of $1 parameter from executed prepared statement (inside a trigger using a current_query()) 如何避免为准备好的语句的每一行启动触发器？ - How to avoid launching a trigger for every row of a prepared statement? 触发器内部的 PERFORM 是否在与调用者相同的事务中执行 function？ - Does PERFORM inside of a trigger execute a function in the same transaction as the caller? 错误：postgresql 中不存在准备好的事务 - ERROR: prepared transaction does not exist in postgresql PostgreSQL。缓慢准备交易并提交准备 - PostgreSQL. Slow Prepare Transaction and Commit Prepared 如何在事务中获取SELECT语句的结果？ - How to get the result of SELECT statement inside a transaction? 触发错误时回滚事务 - Rollback Transaction on Trigger ERROR Postgresql 触发/交易行为 - Postgresql Trigger / Transaction Behaviour 如何检测 PostgreSQL slave 是否与 master 上的已知事务一致？ - How to detect if a PostgreSQL slave is consistent up to a known transaction on the master?

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