spring学习-spring整合mybatis

一、mybatis层，保证mybatis能够独立运行

1.导包，一次性全部导完需要的包

    <dependencies>
        <!--Junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!--数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!-- 数据库连接池 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>

        <!--Servlet - JSP -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!--Mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>

        <!--Spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
    </dependencies>
    <!--Maven资源过滤设置-->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>

</project>

2.前期mysql准备

create database ssm;
use ssm;
create table books(
    bookid int primary key auto_increment not null comment '书id',
  bookName varchar(100) not null comment '书名',
    bookCounts int(11) not null comment '书数量',
    detail varchar(200) not null comment '书描述'
)engine = innodb default charset = utf8

insert into books(bookName,bookCounts,detail)
VALUES
('Java',2,'从入门到放弃'),
('MySql',2,'从删库到跑路'),
('Linux',2,'从进门到进牢');

3.实体类

public class Books {
    private int bookid;
    private String bookName;
    private int bookCounts;
    private String detail;
    ...
}

4.BooksMapper接口和映射文件

public interface BooksMapper {
    //查询所有
    List<Books> queryAllBook();
    //根据id查询
    Books queryBookById(int id);
    //添加
    int addBook(Books book);
    //修改
    int updateBook(Books books);
    //删除
    int deleteBook(@Param("bookId") int id);
}



<?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.cong.dao.BooksMapper">
    <select id="queryAllBook" resultType="books">
        select * from ssm.books;
    </select>
    <select id="queryBookById" resultType="books" parameterType="int">
        select * from ssm.books where bookid = #{id};
    </select>
    <insert id="addBook" parameterType="books">
        insert into ssm.books(bookName, bookCounts, detail)
        VALUES (#{bookName},#{bookCounts},#{detail});
    </insert>
    <update id="updateBook" parameterType="books">
        update ssm.books
        set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail}
        where bookid = #{bookid};
    </update>
    <delete id="deleteBook" parameterType="int">
        delete from ssm.books where bookid = #{bookId}
    </delete>
</mapper>

5.mybatis核心配置文件mybatis-config.xml

db.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456


mybatis-config.xml

<?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>
    <properties resource="db.properties"/>
    <typeAliases>
        <package name="com.cong.pojo"/>
    </typeAliases>
    <!--整合spring之后将会数据源交给了spring配置-->
    <environments default="mysql">
        <environment id="mysql">
            <transactionManager type="JDBC"></transactionManager>
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <mapper resource="com/cong/dao/BooksMapper.xml"/>
    </mappers>
</configuration>

6.测试类

public class MybatisTest {
    @Test
    public void test() throws IOException {
        InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession sqlSession = factory.openSession();
        BooksMapper booksMapper = sqlSession.getMapper(BooksMapper.class);
        List<Books> books = booksMapper.queryAllBook();
        for (Books book : books) {
            System.out.println(book.toString());
        }
        sqlSession.close();
        inputStream.close();
    }
    @Test
    public void test1() throws IOException {
        InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession sqlSession = factory.openSession();
        BooksMapper booksMapper = sqlSession.getMapper(BooksMapper.class);
        Books books = booksMapper.queryBookById(1);
        System.out.println(books.toString());
        sqlSession.close();
        inputStream.close();
    }
    @Test
    public void test2() throws IOException {
        InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession sqlSession = factory.openSession();
        BooksMapper booksMapper = sqlSession.getMapper(BooksMapper.class);
        Books books = new Books();
        books.setBookName("数据结构");
        books.setBookCounts(20);
        books.setDetail("从入门到头秃");
        booksMapper.addBook(books);
        sqlSession.commit();
        sqlSession.close();
        inputStream.close();
    }
    @Test
    public void test3() throws IOException {
        InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession sqlSession = factory.openSession();
        BooksMapper booksMapper = sqlSession.getMapper(BooksMapper.class);
        Books books = new Books();
        books.setBookName("算法设计");
        books.setBookCounts(20);
        books.setDetail("从入门到头秃");
        books.setBookid(5);
        booksMapper.updateBook(books);
        sqlSession.commit();
        sqlSession.close();
        inputStream.close();
    }
    @Test
    public void test4() throws IOException {
        InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession sqlSession = factory.openSession();
        BooksMapper booksMapper = sqlSession.getMapper(BooksMapper.class);
        booksMapper.deleteBook(5);
        sqlSession.commit();
        sqlSession.close();
        inputStream.close();
    }
}

7.查询所有的结果，至此mybatis能够独立运行

二、整合spring

1.创建application.xml配置文件，这个主要就是将其它的配置import进来

<?xml version="1.0" encoding="UTF-8"?>
<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
        http://www.springframework.org/schema/beans/spring-beans.xsd ">
    <import resource="spring-service.xml"/>
    <import resource="spring-dao.xml"/>
</beans>

2.编写spring与mybatis的配置文件spring-dao.xml，这里使用的数据源是c3p0

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">
    <!--1.关联数据库文件-->
    <!--这是装门导入数据库配置文件的，import只能导入spring的文件-->
    <context:property-placeholder location="classpath:db.properties"/>
    <!--2.连接池-->
    <bean id="datasource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>
    <!--3.SqlSessionFactory-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sqlSessionFactory">
        <property name="dataSource" ref="datasource"/>
        <!-- 绑定mybatis全局配置文件:mybatis-config.xml -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>
    <!-- 4.配置扫描Dao接口包，动态实现Dao接口注入到spring容器中 -->
    <!--解释 ： https://www.cnblogs.com/jpfss/p/7799806.html-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 注入sqlSessionFactory -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!-- 给出需要扫描Dao接口包 -->
        <property name="basePackage" value="com.cong.dao"/>
    </bean>
</beans>

spring整合了dao层之后

mybatis-config.xml可以删掉数据库相关的代码了，变成如下

<?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>
    <typeAliases>
        <package name="com.cong.pojo"/>
    </typeAliases>

    <mappers>
        <mapper resource="com/cong/dao/BooksMapper.xml"/>
    </mappers>
</configuration>

3.spring整合service层

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">
    <!--1.扫描service下的包-->
    <context:component-scan base-package="com.cong.service"/>
    <!--将所有的service类注入到spring-->
    <bean class="com.cong.service.BooksServiceImpl" id="booksService">
        <property name="booksMapper" ref="booksMapper"/>
    </bean>
    <!--配置事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="datasource"/>
    </bean>
</beans>

测试

public class SpringTest {
    @Test
    public void test1(){
        //加载配置文件
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        //获取对象
        BooksService booksService = (BooksService) context.getBean("booksService");
        //执行方法
        List<Books> books = booksService.queryAllBook();
        for (Books book : books) {
            System.out.println(book.toString());
        }
    }
}

结果，可以查询

至此，spring整合mybatis完成