mybatis与spring的整合(使用接口实现crud)

本人刚刚接触mybatis,今天把它和spring整合起来用了一个上午==。

一开始是通过配置文件来配置,后来尝试用了一下注解,觉得mybatis的注解真的有点恶心。。。一大坨的,所以我还是建议使用配置文件吧!

1.首先配置spring配置文件

 <!--数据源-->
    <bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="url" value="jdbc:mysql://localhost:3306/test"/>
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
    </bean>

    <!--mybatis 的 sqlsessionFactoryNean-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="datasource"/>
        <property name="configLocation" value="classpath:conf.xml"/>
        <property name="mapperLocations" value="classpath:com/seven/dao/*.xml"/>
        <property name="typeAliasesPackage" value="com.seven.domain"/><!--指定实体类包,自动将实体类的简单类名映射为别名-->
    </bean>

    <!--映射器接口,,,,有了 下面配置就不用了-->
   <!-- <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
        <property name="mapperInterface" value="com.seven.dao.UserMapper"/>
    </bean>-->

    <!--mybatis自动扫描加载sql映射文件:mapperScannerConfigurer-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.seven.dao"/><!--指定sql映射文件、接口所在的包-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
     </bean>

    <!--事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="datasource"/>
    </bean>

    <!--声明事务-->
    <tx:annotation-driven transaction-manager="transactionManager"/>

2.mybatis本身的相关配置

<?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>
        <!-- 全局映射器启用缓存 -->
        <setting name="cacheEnabled" value="true" />
        <!-- 查询时,关闭关联对象即时加载以提高性能 -->
        <setting name="lazyLoadingEnabled" value="true" />
        <!-- 设置关联对象加载的形态,此处为按需加载字段(加载字段由SQL指              定),不会加载关联表的所有字段,以提高性能 -->
        <setting name="aggressiveLazyLoading" value="false" />
        <!-- 对于未知的SQL查询,允许返回不同的结果集以达到通用的效果 -->
        <setting name="multipleResultSetsEnabled" value="true" />
        <!-- 允许使用列标签代替列名 -->
        <setting name="useColumnLabel" value="true" />
        <!-- 允许使用自定义的主键值(比如由程序生成的UUID 32位编码作为键值),数据表的PK生成策略将被覆盖 -->
        <setting name="useGeneratedKeys" value="true" />
        <!-- 给予被嵌套的resultMap以字段-属性的映射支持 -->
        <setting name="autoMappingBehavior" value="FULL" />
        <!-- 对于批量更新操作缓存SQL以提高性能  -->
        <setting name="defaultExecutorType" value="BATCH" />
        <!-- 数据库超过25000秒仍未响应则超时 -->
        <setting name="defaultStatementTimeout" value="25000" />
    </settings>

    <!-- 全局别名设置,在映射文件中只需写别名,而不必写出整个类路径  -->
   <!-- <typeAliases>
        <typeAlias alias="TestBean"
                   type="com.wotao.taotao.persist.test.dataobject.TestBean" />
    </typeAliases>-->

    <!-- 非注解的sql映射文件配置,如果使用mybatis注解,该mapper无需配置,但是如果mybatis注解中包含@resultMap注解,则mapper必须配置,给resultMap注解使用,交给spring管理了 -->
    <!--<mappers>
        <mapper resource="persist/test/orm/test.xml" />
    </mappers>-->


</configuration>

3.实体,接口

package com.seven.domain;

import java.util.Date;

/**
 * Created by Seven on 2015/5/29.
 */
public class User {
    private int id;
    private String loginName;
    private String userName;
    private String password;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getLoginName() {
        return loginName;
    }

    public void setLoginName(String loginName) {
        this.loginName = loginName;
    }

    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;
    }
}
package com.seven.dao;

import com.seven.domain.User;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * Created by Seven on 2015/5/29.
 */
@Transactional
public interface UserMapper {

    void save(User user);

    void update(User user);

    void delete(int id);

    User findById(int id);

    List<User> findAll();

}

4.接下就是比较重要的一步,写接口的映射文件,这样就实验了dao

<?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">
<!--namespace必须是接口的全类名  -->
<mapper namespace="com.seven.dao.UserMapper">

    <resultMap id="userResult" type="User">
        <result column="id" property="id"/>
        <result column="loginName" property="loginName"/>
        <result column="userName" property="userName"/>
        <result column="password" property="password"/>
    </resultMap>

    <!-- 取得插入数据后的id -->
    <insert id="save">
        insert into tb_user(loginName,userName,password)
        values(#{loginName},#{userName},#{password})
    </insert>

    <update id="update">
        update tb_user
        set loginName = #{loginName},
        userName = #{userName},
        password = #{password}
        where id = #{id}
    </update>

    <delete id="delete">
        delete from tb_user
        where id = #{id}
    </delete>

    <select id="findById" resultMap="userResult">
        select *
        from tb_user
        where id = #{id}
    </select>

    <select id="findAll" resultMap="userResult">
        select *
        from tb_user
    </select>
</mapper>

5.测试,需要导入spring的测试包

package com.seven.test;

import com.seven.dao.UserMapper;
import com.seven.domain.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.util.Date;


/**
 * Created by Seven on 2015/5/29.
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("/application.xml")
public class MyTest {

    @Autowired
    private UserMapper userMapper;

    @Test
    public void testSave(){
        System.out.println(userMapper);
        User user = new User();
        user.setLoginName("seven");
        user.setUserName("lin");
        user.setPassword("123");

        userMapper.save(user);
    }

}


总结,通过这种配置可以实现不用sqlsession而实现crud,因为都交给sprin来实现了,但是这种方法在service层实现的时候代码会比较冗余,但是这种方法思路比较清晰,有好有坏==。

 

posted @ 2015-05-30 15:57  SevenLin  阅读(3972)  评论(0编辑  收藏  举报