Spring整合Mybatis

环境搭建

1. 创建数据库

   CREATE DATABASE ssmbuild;
   
   USE ssmbuild;
   
   CREATE TABLE `books`(
   `bookID` INT NOT NULL AUTO_INCREMENT COMMENT '书id',
   `bookName` VARCHAR(100) NOT NULL COMMENT '书名',
   `bookCounts` INT NOT NULL COMMENT '数量',
   `detail` VARCHAR(200) NOT NULL COMMENT '描述',
   KEY `bookID`(`bookID`)
   )ENGINE=INNODB DEFAULT CHARSET=utf8;
   
   INSERT INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`)
   VALUES
   (1,'Java',1,'从入门到放弃'),
   (2,'MysqL',10,'从删库到跑路'),
   (3,'Linux',5,'从进门到进牢');
   

2. 导入Maven依赖

   <!--        单元测试-->
   <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>4.12</version>
   </dependency>
   <!--        数据库-->
   <dependency>
       <groupId>MysqL</groupId>
       <artifactId>mysql-connector-java</artifactId>
       <version>8.0.17</version>
   </dependency>
   <!--        连接数据库-->
   <dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis</artifactId>
       <version>3.5.2</version>
   </dependency>
   <!--  		Spring整合Mybatis-->
   <dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis-spring</artifactId>
       <version>2.0.2</version>
   </dependency>
   <!--        spring操作数据库-->
   <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-jdbc</artifactId>
       <version>5.2.0.RELEASE</version>
   </dependency>
   <!--        Spring-->
   <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-webmvc</artifactId>
       <version>5.2.0.RELEASE</version>
   </dependency>
   <!--        spring AOP-->
   <dependency>
       <groupId>org.aspectj</groupId>
       <artifactId>aspectjweaver</artifactId>
       <version>1.9.4</version>
   </dependency>
   

3. 导入资源过滤

   <build>
       <resources>
           <resource>
               <!--指定配置文件所在的目录-->
               <directory>src/main/java</directory>
               <includes>
                   <include>**/*.properties</include>
                   <include>**/*.xml</include>
               </includes>
               <!--启用上面的过滤文件-->
               <filtering>true</filtering>
           </resource>
           <resource>
               <!--指定配置文件所在的目录-->
               <directory>src/main/resources</directory>
               <includes>
                   <include>**/*.properties</include>
                   <include>**/*.xml</include>
               </includes>
               <!--启用上面的过滤文件-->
               <filtering>true</filtering>
           </resource>
       </resources>
   </build>
   

4. 创建mybatis-config.xml核心配置文件

   <?xml version="1.0" encoding="UTF8" ?>
   <!DOCTYPE configuration
           PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
           "http://mybatis.org/dtd/mybatis-3-config.dtd">
   <configuration>
   
   </configuration>
   

5. 创建spring-dao.xml核心配置文件

   <?xml version="1.0" encoding="UTF8"?>
   <beans xmlns="http://www.springframework.org/schema/beans"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://www.springframework.org/schema/beans
           https://www.springframework.org/schema/beans/spring-beans.xsd">
   
   </beans>
   

6. 创建实体类

   package com.tian.pojo;
   
   public class Books {
       private int bookID;
       private String bookName;
       private int bookCounts;
       private String detail;
   
       public Books() {
       }
   
       public Books(int bookID, String bookName, int bookCounts, String detail) {
           this.bookID = bookID;
           this.bookName = bookName;
           this.bookCounts = bookCounts;
           this.detail = detail;
       }
   
       public int getBookID() {
           return bookID;
       }
   
       public void setBookID(int bookID) {
           this.bookID = bookID;
       }
   
       public String getBookName() {
           return bookName;
       }
   
       public void setBookName(String bookName) {
           this.bookName = bookName;
       }
   
       public int getBookCounts() {
           return bookCounts;
       }
   
       public void setBookCounts(int bookCounts) {
           this.bookCounts = bookCounts;
       }
   
       public String getDetail() {
           return detail;
       }
   
       public void setDetail(String detail) {
           this.detail = detail;
       }
   
       @Override
       public String toString() {
           return "Books{" +
                   "bookID=" + bookID +
                   ", bookName='" + bookName + '\'' +
                   ", bookCounts=" + bookCounts +
                   ", detail='" + detail + '\'' +
                   '}';
       }
   }
   

7. 创建BookMapper接口

   package com.tian.mapper;
   
   public interface BookMapper {
       
   }
   

8. 创建BookMapper.xml配置文件

   <?xml version="1.0" encoding="UTF8" ?>
   <!DOCTYPE mapper
           PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
           "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
   <mapper namespace="com.tian.mapper.BookMapper">
   
   </mapper>
   

操作流程

1. 在spring-dao.xml中导入数据库资源

   <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
       <property name="driverClassName" value="com.MysqL.cj.jdbc.Driver"/>
       <property name="url" value="jdbc:MysqL://localhost:3306/ssmbuild?				useUnicode=true&amp;characterEncoding=UTF- 	         							8&amp;autoReconnect=true&amp;failoverReadOnly=false&amp;serverTimezone=UTC"/>
       <property name="username" value="root"/>
       <property name="password" value="123456"/>
   </bean>
   

2. 在mybatis-config.xml中给实体类起别名

   <typeAliases>
       <typeAlias type="com.tian.pojo.Books" alias="Books"/>
   </typeAliases>
   

3. 编写抽象方法

   //查询所有书
   List<Books> queryAllBook();
   

4. 添加方法映射

   <select id="queryAllBook" resultType="Books">
       select * from books;
   </select>
   

5. 添加配置文件的映射

   <mappers>
       <mapper class="com.tian.mapper.BookMapper"/>
   </mappers>
   

6. 在spring-dao.xml中创建sqlSessionFactory

   <bean id="sqlSessionFactory" class="org.mybatis.spring.sqlSessionfactorybean">
       <property name="dataSource" ref="dataSource"/>
       <property name="configLocation" value="mybatis-config.xml"/>
   </bean>
   

7. 在spring-dao.xml中创建sqlSession

   <bean id="sqlSession" class="org.mybatis.spring.sqlSessionTemplate">
   	<constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"/>
   </bean>
   

8. 测试

   import com.tian.mapper.BookMapper;
   import com.tian.pojo.Books;
   import org.apache.ibatis.session.sqlSession;
   import org.junit.Test;
   import org.springframework.context.ApplicationContext;
   import org.springframework.context.support.ClasspathXmlApplicationContext;
   
   import java.util.List;
   
   public class MyTest {
       @Test
       public void test(){
           //获取sqlSession
           ApplicationContext context = new ClasspathXmlApplicationContext("spring-dao.xml");
   
           sqlSession sqlSession = context.getBean("sqlSession", sqlSession.class);
   
           //获取mapper
           BookMapper mapper = sqlSession.getMapper(BookMapper.class);
   
           //执行查询
           List<Books> books = mapper.queryAllBook();
   
           //输出
           for (Books book : books) {
               System.out.println(book);
           }
       }
   }