What is mybatis lazy loading

MyBatis's lazy loading is a lazy loading mechanism that can load data only when needed, effectively improving the system's performance and resource utilization. When using MyBatis's lazy loading function, you need to ensure that the object is in Accessing associated properties is still within the scope of the database session, otherwise lazy loading exceptions may occur.

# Operating system for this tutorial: Window10 system, Dell G3 computer.

MyBatis is an open source persistence layer framework that supports customized SQL, stored procedures and advanced mapping. In MyBatis, lazy loading (Lazy Loading) is a strategy for delaying data loading. Data can be loaded only when needed, instead of loading all associated data when the object is initialized.

For associated objects, MyBatis provides a lazy loading function, that is, when querying the main object, its associated objects will not be loaded immediately. Only when the properties of the associated object are actually accessed, additional processes will be triggered. SQL queries to load data for these related objects.

The advantage of lazy loading is that it can reduce unnecessary data loading and database queries, save system resources and improve performance. Especially when there are many associated objects or a large amount of data, lazy loading can avoid loading a large amount of data at one time and improve the response speed and throughput of the system.

It should be noted that when using the lazy loading function of MyBatis, you need to ensure that the object is still within the scope of the database session (Session) when accessing the associated properties, otherwise a lazy loading exception may occur.

In short, MyBatis's lazy loading is a delayed loading mechanism that can load data only when needed, effectively improving system performance and resource utilization.

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