What does lazy loading mean?

Lazy loading is a programming pattern that refers to loading data only when needed, rather than the strategy of obtaining data immediately when the object is initialized or loaded. The purpose of lazy loading is to delay the loading of data. , to save system resources and improve performance.

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

Lazy Loading is a programming pattern that refers to the strategy of loading data only when needed, rather than obtaining data immediately when the object is initialized or loaded. The purpose of lazy loading is to delay the loading of data to save system resources and improve performance.

In software development, lazy loading is usually applied in the following two aspects:

1. Lazy loading of properties of an object: when accessing a certain property of the object , if the property has not been loaded, the loading operation will be triggered only when accessed, thus avoiding loading all possible properties when the object is initialized, saving memory and loading time.

2. Lazy loading of database queries: When using the ORM framework for database queries, you can use a lazy loading strategy, that is, the actual database query is only performed when you need to access the data of the associated object. Instead of loading the data of all related objects together during the main query.

The advantage of lazy loading is that it can avoid unnecessary data loading and processing, save system resources, and improve the response speed and performance of the system. However, it should be noted that lazy loading may also bring some additional complexities, such as thread safety and other issues that need to be considered in a multi-threaded environment.

In short, lazy loading is a common optimization method that improves system efficiency and performance by delaying the loading of data.

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