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Hello, I'm looking at the mountain. Today, after the project relies on a basic component, it failed to start. The troubleshooting process took some detours. Finally, it was confirmed that the Java. Com was caused by the version conflict of dependent components Lang.noclassdeffounderror exception. The following is the troubleshooting process. ...

Author: Xiao Fu Ge Blog: https://bugstack.cn Precipitate, share and grow, so that you and others can gain something! 😄 1, Foreword The core principle of Mybatis is also the embodiment of its most convenient use. Why? Because when we use Mybatis, we only need to define an interface that does not need to write implementation classes, a ...

cache 1. What is Cache? There is temporary data in memory. Put the data frequently queried by users in the cache (memory), and users do not need to query from the disk (relational database data file) but from the cache to query the data, so as to improve the query efficiency and solve the performance problem of high concurrency system. ...

Hello, I'm a bookshelf. In the first two sections, it mainly introduces that Mybatis framework completes the basic addition, deletion, modification and query according to Dao layer interface, mapping file (Mapper.xml file for writing SQL statement) and configuration file SqlMapConfig.xml. This section will go deep into mapping files and intro ...

Basic use of Mybatis Learning objectives Meet Mybatis Learn about Mybatis features Know why to learn Mybatis Use Mybatis to write a simple program Learn to use the basic functions of Mybatis Understand the basic configuration of Mybatis 1, Meet Mybatis Official documents 1. Introduction MyBatis was apache An open source project ...

1 one to one query (many to one) Use the simplest User and Account model to analyze the multi table relationship of Mybatis. The User is the User table and the Account is the Account table. A User can have multiple accounts (Account), requirement: query all Account information and associate query order User information. Note: because an Accoun ...

Daily Maxim I am confident, so I succeed. mybatis plus Required Foundation: ssm javaweb mysql javaSE Knowledge points that must be learned Why learn from him? Is mybatis not enough? mybatis is very convenient, and plus will certainly be more convenient brief introduction Mybatis simplifies jdbc, and mybatis plus simplifies mybatis ...

preface In the use of Mybatis, for database operations, we create a corresponding interface and sql mapping file for each table. Note that our dao interface is not directly used in the code in the above two articles. The following will introduce two uses of dao interface. Tip: the following is the main content of this article. The followi ...

In the development, we often encounter that the entity class attributes are named by hump, and the underscores are used in the database_ As a result, the attribute name in the entity class does not correspond to the field name in the database: In java code, we usually use hump naming public class Staff { private Integer id; private St ...

File upload and download case based on SpringBoot and Mybatis This case is based on the actual combat of the [bad programmer] enterprise file upload and download project based on SpringBoot and Mybatis. BiliBili link: https://www.bilibili.com/video/BV1764y1u7gn?p=1 Effect achieved 1. Users need to log in first. We use shiro authentication to ...