How to elegantly get Java entity class variable name to dynamically build MyBatis query conditions?

Dynamically building query conditions is very common when using MyBatis-Plus or other ORM frameworks for database operations. This article discusses how to elegantly obtain Java entity class variable names to avoid maintenance problems caused by hard-coded strings, especially for using the tk MyBatis framework.

Problem: When tk MyBatis builds Example object query, the conditional statement directly uses hard-coded strings (such as "isdeleted"), and the maintenance cost is high when there are many field names or changes. Developers want to get variable names directly like dog.isdeleted , or convenient ways similar to Lombok annotations.

Solution: tk MyBatis itself does not provide a way to directly get the name of the entity class variable. The best practice is to migrate to MyBatis-Plus, leveraging its QueryChainWrapper and LambdaQueryChainWrapper to provide more flexible query methods. LambdaQueryChainWrapper is particularly recommended, which allows the use of Lambda expressions to directly refer to entity class attributes, avoiding hard-coded attribute names.

Example of Lambda expression for MyBatis-Plus:

 lambdaQuery().eq(Entity::getId, value).list();

This code directly references the id attribute in Entity class through Entity::getId , without explicitly writing the "id" string. This simplifies the code, improves readability, and effectively solves maintenance problems. Although reflection is still used at the bottom, MyBatis-Plus' API design hides the complexity of reflection and improves development efficiency. In contrast, although it is feasible to use reflection directly, the code complexity is significantly increased and error-prone. Therefore, the Lambda expression method of MyBatis-Plus is a better solution.

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