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Preface Above How the Mapper interface of Mybatis executes SQL You learned that Mapper executes SQL through a dynamic proxy, but there is no detailed description of how the method maps, including method names, return values, parameters, and so on; how these relate to xxMapper.xml. Method Name Mapping The purpose of caching MapperMethod s me ...

1 Description The reconstruction control file can only be used in case of necessity. It is generally used in the following situations: 1 all current copies of the control file have been lost or are corrupted 2 you are restoring a backup in which the control file is corrupted or missing 3 you need to change a hard li ...

nested exception Before we learn about SPL exceptions, let's take a look at nested exceptions. As the name implies, nested exceptions are nested inside the Exception. An Exception is thrown, and an Exception is thrown after the catch arrives. In this case, nested exceptions can be obtained by the getPrevious method of the Exception base class; ...

Recently, I want to write a mybatis paging plug-in, but before I write the plug-in, I must understand the specific working principle of mybatis, so I will start to work by referring to other blogs and reading the source code. Core components: SqlSession Executor StatementHandler ParameterHandler ResultSetHandler TypeHandler MappedStatement Co ...

After we set up Alwayson, there is no corresponding account in the database under the secondary copy. How to synchronize the account? How to set the account synchronization without knowing the password.   We can use SP -- sp ﹣ help ﹣ revlog in. This stored procedure is created on the primary copy. When executing, the SQL command will be gen ...

1. Import Oracle database data into test library environment 172.15.1.51 root  kic@test 172.15.1.52 root  Generally, the data is imported into the environment of 52 (the configuration is relatively low), and then the data is imported into the environment of 51 (the environment used in this document) [root@NC-TEST ~]# df -h Filesystem ...

Made By Herolh Catalog [TOC] 1. What is MySQL Server side Client Mysql database MySQL is the most popular relational database management system, and MySQL is one of the best RDBMS(Relational Database Management System) application software in WEB application. It is developed by MySQL AB company in Sweden and currently belongs to Oracle co ...

Guide reading Official website: http://www.freetds.org Download address: http://ibiblio.org/pub/Linux/ALPHA/freetds/stable/freetds-stable.tgz This software can connect MS SQL server and Sybase database with Linux and Unix Installation and configuration Download the FreeTDS installation package to the server first wget -c http://ibiblio.org/ ...

Project summary: EF operation and Linq writing record 1. Introduction of EF After creating an MVC project, to reference the EF framework, follow these steps: 1), add project in Models 2) select Entity Data Model and fill in the name again 3) after selecting code first, select the connected database and tables, and then generate them. At th ...

Stored procedures are used to perform specific operations and complete certain functions. They can have input parameters in and output parameters out. Store functions are used to return specific results. Use the return clause at the head of the function, specify the type of return, and use the return clause in the execution part to ...