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order This paper mainly studies Sharing-jdbc's SQLExecution Hook. SQLExecutionHook incubator-shardingsphere-4.0.0-RC1/sharding-core/sharding-core-execute/src/main/java/org/apache/shardingsphere/core/execute/hook/SQLExecutionHook.java public interface SQLExecutionHook { /** * Handle when SQL execution started. * * @param ...

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In MySQL's official manual, about Introduction to index merge Very few. There are even many misleading places. This time, I have looked over the code of version 5.1 about this kind of optimization processing, and introduced various practical index merge access types of SQL in a case-by-case way. Subsequently, we will continue to introduce the m ...

Eureka Yes. Netflix Developed, a REST-based component for service registration and discovery It mainly includes two components: Eureka Server and Eureka Client. Eureka Client: A Java client used to simplify interaction with Eureka Server (usually the client and server in microservices) Eureka Server: The ability to provide service registra ...

The blogger has written archive scripts for many projects. For the script development of deleting data, it must be the simplest delete statement at the beginning. Then, because of the large amount of data in some tables and the large number of indexes, it will be found that deleting data is very slow and affects the normal use of the system. Th ...

Foreign Key If there's a table today with a lot of job information on it We can associate two tables by using foreign keys Such benefits can save space, for example, you have a long job title today, it is a waste of space to repeat the name of the job in a table; besides, it can also play a restraining role. Departments, for example, ar ...

The basic syntax for splicing Mybatis dynamic sql depends on < if > tags and < Where > tags. The < foreach > tag is used in traversal Demand one Query object is wrapped by wrapping class, and sql statement is stitched dynamically according to the attribute of object. Packaging cla ...

Scene: Basic Knowledge Query Motivation: Pure basic knowledge is accumulated to facilitate follow-up inquiries. In many occasions, people in charge are talking about going to IOE. Therefore, inevitably, the use of occasions will be more or less reduced, so according to the customary thinking record. ...

Execution results in JdbcTemplate contain embedded entities One way Mode two Mode three When using JDBCTemplate, you will encounter situations where other entities are embedded in the entity, so that fields in the entity will not be assigned. There are three ways to solve this problem, each of whi ...

subject There are three forms for classes, students and grades: Note: Table name and field name can refer to the word settings in the table. According to the table information, complete the following SQL statements as required: 1. Use SQL to create the table structure of class table, student table and achievement table. The data in the ta ...