基于XML + Annotation的MyBatis配置 [英] XML + Annotation based configuration for MyBatis

问题描述

是否可以在应用程序中同时具有基于XML + Annotation的MyBatis配置.

Is it possible to have both the XML + Annotation based configuration for MyBatis in an application.

之所以这样问，是因为在我的应用程序中，我使用的是基于注释的方法. 但是在一种情况下，我需要使用IN子句，可以使用

The reason that I am asking this is because, in my application I am using the Annotation based approach. But in one of the scenarios , I require to use an IN clause, which can be built using the

<foreach></foreach>

基于XML的配置.

但是，当我启动应用程序时，它似乎无法识别基于注释的映射器，并给了我一个Type interface is not known to the MapperRegistry异常

However , when I start my application , it does not seem to recognize my Annotation based mappers and gives me a Type interface is not known to the MapperRegistry exception

因此，我想知道是否有可能在应用程序中同时具有MyBatis的基于XML + Annotation的配置. 请提出建议.

Therefore I would like to know whether is it possible to have both the XML + Annotation based configuration for MyBatis in an application. Please suggest.

推荐答案

可能同时具有基于XML +注释的配置

Its possible to have both XML + Annotation based configuration

对于基于 xml 的配置:

从您的spring上下文文件开始.在上下文文件中添加以下行

Start with your spring context file.In your context file add following lines

<beans:bean id="dataSource"
              class="org.springframework.jdbc.datasource.DriverManagerDataSource"
              p:driverClassName="yourDriverClassName"
              p:url="yourUrl"
              p:username="yourUsername"
              p:password="yourPassword" />

<beans:bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <beans:property name="dataSource" ref="dataSource" />
    <beans:property name="configLocation" value="/WEB-INF/mybatis-config.xml" />
</beans:bean>
<!-- assuming you have a dao named UserDao -->
<beans:bean id="userDao" class="com.yourcomp.dao.Userdao">
    <beans:property name="sqlSessionFactory" ref="sqlSessionFactory" />
</beans:bean>

您的mybatis-config.xml应该是这样的:

your mybatis-config.xml should be something like this:

<?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>

  </settings>
  <typeAliases>

    <typeAlias alias="User" type ="com.yourcomp.domain.User" />

  </typeAliases>
  <mappers>

    <mapper resource="com/yourcomp/domain/UserMapper.xml"/>
    <mapper resource="com/yourcomp/domain/AnotherDomainObjectMapper.xml"/>
  </mappers>

</configuration>

和src/com/yourcomp/domain/中的userMapper.xml可能是这样的

and your userMapper.xml in src/com/yourcomp/domain/ might be something like this

<?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="org.pbl.rms.RMSUserDao">-->

<mapper namespace="com.yourcomp.domain.User">

  <resultMap id="userMap" type="User">
  <id property="userId" column="USER_ID" javaType="int" jdbcType="NUMERIC"/>
  <result property="userName"  column="USER_NAME" javaType="String" jdbcType="VARCHAR"/>
  <result property="userFullName"  column="USER_FULL_NAME" javaType="String" jdbcType="VARCHAR"/>
  <result property="password"  column="PASSWORD" javaType="String" jdbcType="VARCHAR"/>
  <result property="passwordExpiryDate"  column="PASWRD_EXPIRY_DATE" javaType="java.util.Date" jdbcType="DATE"/>
  <result property="status" column="STATUS" javaType="_integer" jdbcType="DECIMAL"/>
  </resultMap>

  <select id="getUserById" parameterType="map" resultMap="userMap">
  select  * from user where USER_ID=#{userId}
  </select>

</mapper>

现在在您的DAO层中，您可能会拥有如下所示的类:

now in your DAO layer you might have class like follows:

public class UserDAO{

    private SqlSessionFactory sqlSessionFactory;

    public UserDAO() {

    }

    public UserDAO(SqlSessionFactory sqlSessionFactory ) {
        this.sqlSessionFactory = sqlSessionFactory;

    }
    public String getUserById(Integer userId) {
        SqlSession session = sqlSessionFactory.openSession();
        //int success = -100;
        String name=null;
        try {
            name = (String)session.selectOne("com.yourcomp.domain.User.getUserById",userId);
        }catch(Exception e){

        }finally {
            session.close();
        }
        return name;
    }
}

现在，要使用基于注释的配置，请添加以下内容:

Now For using annotation based configuration add the followings:

您可能具有如下界面:

public interface MyMapper {
    @Select(value="select something from some_table")
    public String getSomeValue(@Param("someParam") String someParam);

}

现在将以下内容添加到您的上下文文件中:

now add the followings to your context file:

<beans:bean id="annotatedMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
  <beans:property name="mapperInterface" value="com.yourcomp.MyMapper" />
  <!-- remember the sqlsession factory defined earlier for xml based conf ? -->
  <beans:property name="sqlSessionFactory" ref="sqlSessionFactory" />
</beans:bean>

希望这会有所帮助:)

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