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1. typeHandlers label Whether MyBatis sets a parameter in the PreparedStatement or takes a value from the result set, it will use the type processor to convert the obtained value into Java type in an appropriate way. The following table describes some of the default processor types (interceptions). You can override the type processor or cre ...

SSM development novice guide (with educational administration system project) preface When learning the SSM framework, friends who learn Java often encounter many problems. Whether they create new projects themselves or download other people's projects and use them, they will encounter some problems that have nowhere to start. So I wrote this ...

Mybatis is a "sql oriented" persistence layer framework. It can dynamically assemble sql, which is extremely flexible. At the same time, it avoids almost all JDBC code, manually setting parameters and obtaining result sets. Its plug-in mechanism allows intercepting calls at a certain point during the execution of mapped statements, an ...

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Mybatis 1. Introduction 1.1. What is Mybatis MyBatis is an excellent persistence layer frameworkIt supports customized SQL, stored procedures, and advanced mapping.MyBatis avoids almost all JDBC code and manually setting parameters and getting resultsMyBatis can use simple XML or annotations to configure and map native types, interfaces and ...

Learning objectives Understand the concept of data persistence and ORM principlesUnderstanding the concept of MyBatis is a bit characteristic at the first levelBuild MyBatis environmentUnderstand the difference and relationship between MyBatis and JDBCUnderstand the scope and declaration cycle of core classesMaster the structure and content of ...

Hikari+jdbcTemplate+mysql pom.xml <!-- Connection pool, jdbc，Transaction related--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jdbc</artifactId> </dependency> <!-- mysql drive--> ...

Connect to the database through the XML configuration file and configure the path of the XML file that executes the SQL statement <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <environments defaul ...

CRUD namespace The package name in the namespace should be consistent with the package name of Dao/mapper interface select id: is the method name in the corresponding namespace I personally understand that namespace is the interface implemented, and id is the method of rewriting the interface resultType: the return value type of sql execu ...

preface Using mybatis plus Field type processor , you can easily map data such as arrays and objects directly to entity classes with only one annotation. @Data @Accessors(chain = true) @TableName(autoResultMap = true) public class User { private Long id; ... /** * be careful!! Mapping annotation must be turned on * ...