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This article mainly explains "how to solve the problem of AutoResultMap errors in ibatis". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to solve the problem of AutoResultMap errors in ibatis".

Recently, I encountered a problem when using ibatis query to return values. When the number of columns returned is not fixed, ibatis will report an error whenever the number of columns changes.

Some of the configurations are as follows:

Reason:

In order to avoid frequent introspection of the returned metadata, ibatis will remember the metadata of the last query. When the next query is made, it will map the results of the query to the metadata previously remembered. If a mismatch is found, an error will be reported.

So that's why resultClass is set to HashMap, and it also prompts you why the mapping attribute column name is invalid.

Solve

The select tag of ibatis has an attribute remapResults, which defaults to false. When remapResults is set to true, ibatis sets the metadata based on the returned results and no longer maps based on the metadata that was last remembered.

This property will cause some performance loss, so use it with caution

Or use $$to solve the problem.

Select $selectresultfield$ as resultfield Thank you for your reading, the above is the content of "how to solve the problem of AutoResultMap error in ibatis". After the study of this article, I believe you have a deeper understanding of how to solve the problem of AutoResultMap error in ibatis, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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