what is maven?

Maven Project Object Model (POM) is a project management tool software that can manage project construction, reporting and documentation through a short description of information.

2.4. Create a Maven project and configure pom.xml

 1     <dependencies>
 2         <!-- Add to MyBatis Frame 3.4.6 Edition -->
 3         <dependency>
 4             <groupId>org.mybatis</groupId>
 5             <artifactId>mybatis</artifactId>
 6             <version>3.4.6</version> <!-- Revision of version number as appropriate -->
 7         </dependency>
 8         <!-- Add to MySql Driving package -->
 9         <dependency>
10             <groupId>mysql</groupId>
11             <artifactId>mysql-connector-java</artifactId>
12             <version>5.1.25</version>
13         </dependency>
14     </dependencies>

2.5. Create an XML configuration for MyBatis

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE configuration
 3   PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
 4   "http://mybatis.org/dtd/mybatis-3-config.dtd">
 5 <configuration>
 6     <environments default="development">
 7         <environment id="development">
 8             <transactionManager type="JDBC" />
 9             <dataSource type="POOLED">
10                 <property name="driver" value="com.mysql.jdbc.Driver" /> <!-- Driving type -->
11                 <property name="url" value="jdbc:mysql://localhost:3306/sam" /> <!-- Connection string -->
12                 <property name="username" value="root" /> <!-- User name -->
13                 <property name="password" value="root" /> <!-- Password -->
14             </dataSource>
15         </environment>
16     </environments>
17     <mappers>
18         <mapper resource="DeptMapper.xml" /> <!-- mapping SQL Sentence XML file -->
19     </mappers>
20 </configuration>

2.6. Create XML Mapping SQL Statements

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE mapper
 3   PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 4   "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 5 <mapper namespace="Dept">
 6     <!-- Insert individual department information -->
 7     <insert id="InsertDept">
 8         INSERT INTO DEPT (DNAME,LOC)
 9         VALUES (#{DName},#{Loc})
10     </insert>
11 </mapper>

CRUD syntax

 1 <insert id="insertAuthor">
 2   insert into Author (id,username,password,email,bio)
 3   values (#{id},#{username},#{password},#{email},#{bio})
 4 </insert>
 5 
 6 <update id="updateAuthor">
 7   update Author set
 8     username = #{username},
 9     password = #{password},
10     email = #{email},
11     bio = #{bio}
12   where id = #{id}
13 </update>
14 
15 <delete id="deleteAuthor">
16   delete from Author where id = #{id}
17 </delete>

2.7. Creating Entity Classes

Table structure

 1 package com.chenyanbin;
 2 
 3 public class Dept {
 4     //Department name
 5     private String DName;
 6     //Departmental position
 7     private String Loc;
 8     public String getDName() {
 9         return DName;
10     }
11     public void setDName(String dName) {
12         DName = dName;
13     }
14     public String getLoc() {
15         return Loc;
16     }
17     public void setLoc(String loc) {
18         Loc = loc;
19     }
20 }

2.8. Create Main Function

 1 package com.chenyanbin;
 2 
 3 import java.io.IOException;
 4 import java.io.InputStream;
 5 import org.apache.ibatis.io.Resources;
 6 import org.apache.ibatis.session.SqlSession;
 7 import org.apache.ibatis.session.SqlSessionFactory;
 8 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 9 
10 public class TestMain {
11     public static void main(String[] args) throws IOException {
12         //Create entity classes
13         Dept dept = new Dept();
14         dept.setDName("Business department");
15         dept.setLoc("Xie");
16         //Load XML file
17         InputStream is = Resources.getResourceAsStream("myBatis-config.xml"); //Load MyBatis Configuration file
18         //Initialization SqlSessionFactory
19         SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
20         SqlSession session = factory.openSession();
21         session.insert("InsertDept", dept);
22         session.commit();
23         session.close();
24     }
25 }

2.9. Catalogue of Project Files

The above configuration is complete, but the blogger encounters a problem, the database is saved, the program warning, warning as follows:

 WARNING: An illegal reflective access operation has occurred

WARNING: Illegal reflective access by org.apache.ibatis.reflection.Reflector (file:/C:/Users/Windows10/.m2/repository/org/mybatis/mybatis/3.4.6/mybatis-3.4.6.jar) to method java.lang.Class.checkPackageAccess(java.lang.SecurityManager,java.lang.ClassLoader,boolean)
WARNING: Please consider reporting this to the maintainers of org.apache.ibatis.reflection.Reflector
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

After checking online, jdk8 has limited reflection. There are two solutions

1. Return JDK to jdk9
2. Upgrade MyBatis