JDBC连接默认的autoCommit行为 [英] JDBC connection default autoCommit behavior

问题描述

我正在使用JDBC来连接到Oracle.我测试了connection.setAutoCommit(false) vs connection.setAutoCommit(true)，结果与预期的一样.

I'm working with JDBC to connect to Oracle. I tested connection.setAutoCommit(false) vs connection.setAutoCommit(true) and the results were as expected.

默认情况下，连接应该像autoCommit(true)一样工作(如果我错了，请纠正我)，但是在调用connection.commit()之前，不会插入任何记录.关于默认行为有什么建议吗?

While by default connection is supposed to work as if autoCommit(true) [correct me if I'm wrong], but none of the records are being inserted till connection.commit() was called. Any advice regarding default behaviour?

String insert = "INSERT INTO MONITOR (number, name,value) VALUES (?,?,?)";

conn = connection; //connection  details avoided
preparedStmtInsert = conn.prepareStatement(insert);
preparedStmtInsert.execute();

conn.commit();

推荐答案

来自 Oracle JDBC文档:

创建连接后，它处于自动提交模式.这表示 每个单独的SQL语句都被视为事务，并且 执行后立即自动提交. (更多 精确地，默认情况是默认情况下要提交一条SQL语句 完成，而不是在执行时.当所有 已检索到其结果集和更新计数.在几乎 但是，在所有情况下，声明均已完成，因此已提交， 立即执行.)

When a connection is created, it is in auto-commit mode. This means that each individual SQL statement is treated as a transaction and is automatically committed right after it is executed. (To be more precise, the default is for a SQL statement to be committed when it is completed, not when it is executed. A statement is completed when all of its result sets and update counts have been retrieved. In almost all cases, however, a statement is completed, and therefore committed, right after it is executed.)

另一件事是-您忽略了连接创建的详细信息，所以我只是在猜测-如果您使用的是某些框架，或者从数据源或连接池获取连接，则autocommit可能会变成off这些框架/池/数据源-解决方案是永远不要信任默认设置;-)

The other thing is - you ommitted connection creation details, so I'm just guessing - if you are using some frameworks, or acquiring a connection from a datasource or connection pool, the autocommit may be turned off by those frameworks/pools/datasources - the solution is to never trust in default settings ;-)

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