java中的PreparedStatement.addBatch有什么限制吗？ [英] PreparedStatement.addBatch in java has any restrictions?

问题描述

我正在尝试优化将大量结果插入远程mySQL数据库的过程。我正在使用简单的jdbc。

I'm trying to optimize the process of inserting a large number of results to a remote mySQL database. I'm using simple jdbc for that.

目前我正在用PreparedStatement替换exiting语句，并使用addBatch / executeBatch方法执行方法。有谁知道批量执行的限制是什么？我可以在执行前添加多少批，以确保流程不会失败？查询不是特殊查询，它们没有blob或其他大字段。

Currently I'm replacing exiting statements with PreparedStatement and execute methods with addBatch/executeBatch methods. Does anyone know which are the limits of a batch execution? How many batches can I add before execution to make sure the process doesn't fail? The queries are not special queries, they don't have blobs or other large fields.

推荐答案

@BalusC打了钉子头。如果您正在使用MySQL，请使用最新的驱动程序将 rewriteBatchedStatements = true 添加到您的连接字符串中，以使statement.addBatch（）实际创建批量插入。

@BalusC hit the nail on the head. If you're using MySQL, use the latest driver add rewriteBatchedStatements=true to your connection string to make statement.addBatch() actually create batch inserts.

关于MySQL JDBC性能的精彩演示：
http://assets.en.oreilly.com/1/event/21/Connector_J%20Performance%20Gems%20Presentation.pdf

Nice presentation on MySQL JDBC performance: http://assets.en.oreilly.com/1/event/21/Connector_J%20Performance%20Gems%20Presentation.pdf

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