一、mybatis的兩種開發方式

1. 使用原生介面
2. Mapper代理實現自定義介面

二、使用原生介面開發

1. 在資料庫Test下新建表

   SET NAMES utf8mb4;
   SET FOREIGN_KEY_CHECKS = 0;
   
   -- ----------------------------
   -- Table structure for t_account
   -- ----------------------------
   DROP TABLE IF EXISTS `t_account`;
   CREATE TABLE `t_account`  (
     `id` int(0) NOT NULL AUTO_INCREMENT,
     `username` varchar(11) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
     `password` varchar(11) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
     `age` int(0) NULL DEFAULT NULL,
     PRIMARY KEY (`id`) USING BTREE
   ) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
   
   SET FOREIGN_KEY_CHECKS = 1;
    
   

2. 在Idea中新建普通maven工程，pom.xml新增如下依賴

   <?xml version="1.0" encoding="UTF-8"?>
   <project xmlns="http://maven.apache.org/POM/4.0.0"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
       <modelVersion>4.0.0</modelVersion>
   
       <groupId>org.simon</groupId>
       <artifactId>app</artifactId>
       <version>1.0-SNAPSHOT</version>
   
       <properties>
           <simon.version>1.0.0</simon.version>
           <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
           <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
           <maven.compiler.source>8</maven.compiler.source>
           <maven.compiler.target>8</maven.compiler.target>
   
           <mybatis.version>3.5.7</mybatis.version>
           <mysql-jdbc.verison>8.0.26</mysql-jdbc.verison>
           <lombok.version>1.18.20</lombok.version>
       </properties>
   
       <dependencies>
           <dependency>
               <groupId>org.mybatis</groupId>
               <artifactId>mybatis</artifactId>
               <version>${mybatis.version}</version>
           </dependency>
           <dependency>
               <groupId>mysql</groupId>
               <artifactId>mysql-connector-java</artifactId>
               <version>${mysql-jdbc.verison}</version>
           </dependency>
           <dependency>
               <groupId>org.projectlombok</groupId>
               <artifactId>lombok</artifactId>
               <version>${lombok.version}</version>
               <scope>provided</scope>
           </dependency>
       </dependencies>
       <!--通常情況下，mybatis只能讀取resources下的xml檔案，為了能讀取java下的xml檔案，做如下配置-->
       <build>
           <resources>
               <resource>
                   <directory>src/main/java</directory>
                   <includes>
                       <include>**/*.xml</include>
                   </includes>
               </resource>
           </resources>
       </build>
   
   
   </project>
    
   

3. 新建實體類Account

   package com.simon.app.entity;
   import lombok.AllArgsConstructor;
   import lombok.Data;
   
   @Data
   @AllArgsConstructor
   public class Account {
       private int id;
       private String username;
       private String password;
       private int age;
   }
   
   

​ @AllArgsConstructor註解自動生成以所有屬性作為引數的建構函式

4. 在resources目錄下建立mybatis配置檔案config.xml，該檔名任意

   <?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 default="development">
           <environment id="development">
               <!--配置jdbc事務管理-->
               <transactionManager type="JDBC"></transactionManager>
               <dataSource type="POOLED">
                 <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                 <property name="url" value="jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=UTF-8"/>
                 <property name="username" value="root"/>
                 <property name="password" value="root"/>
               </dataSource>
           </environment>
       </environments>
       <mappers>
           <mapper resource="com/simon/app/mapper/AccountMapper.xml"></mapper>
       </mappers>
   </configuration>
   

5. 建立mapper對映檔案AccountMapper.xml

   <?xml version="1.0" encoding="UTF-8"?>
   <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
   <mapper namespace="com.simon.app.mapper.AccountMapper">
       <insert id="save" parameterType="com.simon.app.entity.Account">
           insert into t_account(username,password,age) values (#{username},#{password},#{age})
       </insert>
   </mapper>
   

   • namespace的值為對映檔案的全路徑名去掉xml副檔名
   • insert中的id就是對外提供呼叫的方法名

6. 測試程式碼

   package com.simon.app.test;
   
   import com.simon.app.entity.Account;
   import org.apache.ibatis.session.SqlSession;
   import org.apache.ibatis.session.SqlSessionFactory;
   import org.apache.ibatis.session.SqlSessionFactoryBuilder;
   
   import java.io.InputStream;
   
   public class Test {
       public static void main(String[] args) {
           InputStream resource = Test.class.getClassLoader().getResourceAsStream("config.xml");
           SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
           SqlSessionFactory sessionFactory = sqlSessionFactoryBuilder.build(resource);
           SqlSession sqlSession = sessionFactory.openSession();
           String statement="com.simon.app.mapper.AccountMapper.save";
   
           Account account=new Account(1,"simon","111111",20);
           sqlSession.insert(statement,account);
           sqlSession.commit();
       }
   }