mybatis学习四：mybatis之SqlSessionTemplate的使用

1、引入相关依赖：

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>4.3.18.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>4.3.21.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.4.6</version>
</dependency>
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>1.3.2</version>
</dependency>

2、编写spring配置文件：

需要添加组件扫描，并且注入org.mybatis.spring.SqlSessionTemplate

<?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:util="http://www.springframework.org/schema/util"
        xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.3.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">
 
    <!-- 配置组件扫描 -->
    <context:component-scan base-package="org.spring.teach"/>
    <!-- 读取db.properties文件 -->
    <util:properties id="dbprop" location="classpath:db.properties"/>
    <!-- 配置连接池 -->
    <bean id="ds" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="#{dbprop['driver']}"/>
        <property name="url" value="#{dbprop['url']}"/>
        <property name="username" value="#{dbprop['user']}"/>
        <property name="password" value="#{dbprop['pwd']}"/>
        <property name="initialSize" value="#{dbprop.initSize}"/>
        <property name="maxActive" value="#{dbprop.maxSize}"/>
    </bean>
    <!--
        配置SqlSessionFactoryBean
        该bean的作用是用来代替MyBatis配置文件
        MyBatis配置文件:是用来指定连接池和mapper.xml文件路径的
    -->
    <bean id="ssb" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 指定连接资源 -->
        <property name="dataSource" ref="ds"/>
        <!-- 指定映射文件 -->
        <property name="mapperLocations" value="classpath:org/spring/teach/entity/*.xml"/>
        <!-- 指定mybatis配置文件，做而外配置 -->
        <property name="configLocation" value="classpath:mybatisConfigure.xml"/>
    </bean>
    <!--
		配置SqlSessionTemplate
		SqlSessionTemplate封装了SqlSession的操作
	-->
    <bean id="sst" class="org.mybatis.spring.SqlSessionTemplate">
        <!-- 指定SqlSessionFactoryBean -->
        <constructor-arg index="0" ref="ssb"/>
    </bean>
</beans>

3、编写mybatis配置文件：

<?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>
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>
    <typeAliases>
        <typeAlias type="org.spring.teach.entity.User" alias="User"/>
    </typeAliases>
</configuration>

4、编写Entity、Mapper映射接口、Mapper映射接口实现类、Mapper映射文件：

package org.spring.teach.entity;
 
public class User {
 
    private Integer id;
    private String name;
    private String username;
    private String password;
    private String gender;
 
    public Integer getId() {
        return id;
    }
 
    public void setId(Integer id) {
        this.id = id;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public String getUsername() {
        return username;
    }
 
    public void setUsername(String username) {
        this.username = username;
    }
 
    public String getPassword() {
        return password;
    }
 
    public void setPassword(String password) {
        this.password = password;
    }
 
    public String getGender() {
        return gender;
    }
 
    public void setGender(String gender) {
        this.gender = gender;
    }
 
    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", gender='" + gender + '\'' +
                '}';
    }
}

package org.spring.teach.dao;
 
import org.spring.teach.annotations.MyBatisRepository;
import org.spring.teach.entity.User;
 
import java.util.List;
 
public interface UserMapper {
 
    List<User> findAll();
 
    User findById(Integer id);
 
    int save(User user);
 
    int delete(Integer id);
 
    int update(User user);
}

@Repository("userMapper")
public class UserMapperImpl implements UserMapper {

    /*
     * 不用考虑提交事务和关闭SqlSession,
     * SqlSessionTemplate已经处理了。
     */
    @Autowired
    @Qualifier("sst")
    private SqlSessionTemplate sst;

    @Override
    public List<User> findAll() {
        return sst.selectList("org.spring.teach.dao.UserMapper.findAll");
    }

    @Override
    public User findById(Integer id) {
        return sst.selectOne("org.spring.teach.dao.UserMapper.findById", id);
    }

    @Override
    public int save(User user) {
        return sst.insert("org.spring.teach.dao.UserMapper.save", user);
    }

    @Override
    public int delete(Integer id) {
        return sst.delete("org.spring.teach.dao.UserMapper.delete", id);
    }

    @Override
    public int update(User user) {
        return sst.update("org.spring.teach.dao.UserMapper.update", user);
    }
}

<?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">
<!-- 映射文件 -->
<mapper namespace="org.spring.teach.dao.UserMapper">
    <insert id="save" parameterType="User">
		insert into t_user values(t_user_seq.nextval,#{username},#{name},#{password},#{gender})
	</insert>
 
    <select id="findAll" resultType="User">
		select * from t_user
	</select>
 
    <select id="findById" parameterType="int" resultType="User">
        select * from t_user where id = #{id}
    </select>
    <update id="update" parameterType="User">
        update t_user set username = #{username},name = #{name},password = #{password},gender = #{gender} where id = #{id}
    </update>
    <delete id="delete" parameterType="int">
        delete from t_user where id = #{id1}
    </delete>
</mapper>

5、测试：

public class TestCase {

    private AbstractApplicationContext app;
    private UserMapper dao;

    @Before
    public void before() {
        app = new ClassPathXmlApplicationContext("spring-mybatis.xml");
        //这个bean的名称需要和UserMapperImpl里面@Repository注解的一致
        dao = app.getBean("userMapper", UserMapper.class);
        System.out.println("........." + dao);
    }

    @After
    public void after() {
        app.close();
    }

    @Test
    public void save() {
        User user = new User();
        user.setUsername("赵六");
        user.setName("赵六");
        user.setPassword("534634634");
        user.setGender("男");
        int row = dao.save(user);
        System.out.println(row);
    }

    @Test
    public void findAll() {
        List<User> list = dao.findAll();
        System.out.println(list);
    }

    @Test
    public void findById() {
        User user = dao.findById(1);
        System.out.println(user);
    }

    @Test
    public void update() {
        User user = new User();
        user.setId(62);
        user.setUsername("赵六");
        user.setName("赵六");
        user.setPassword("gfnvcvsdv");
        user.setGender("女");
        int row = dao.update(user);
        System.out.println(row);
    }

    @Test
    public void delete() {
        int row = dao.delete(64);
        System.out.println(row);
    }

}