Mybatis批量更新三种方式的实现

<update id="updateBatch" parameterType="java.util.List"> 
  <foreach collection="list" item="item" index="index" open="" close="" separator=";">
    update tableName
    <set>
      name=${item.name},
      name2=${item.name2}
    </set>
    where id = ${item.id}
  </foreach>   
</update>

<update id="updateBatch" parameterType="java.util.List">
    update tableName
    <trim prefix="set" suffixOverrides=",">
      <trim prefix="c_name =case" suffix="end,">
        <foreach collection="list" item="cus">
          <if test="cus.name!=null">
            when id=#{cus.id} then #{cus.name}
          </if>
        </foreach>
      </trim>
      <trim prefix="c_age =case" suffix="end,">
        <foreach collection="list" item="cus">
          <if test="cus.age!=null">
            when id=#{cus.id} then #{cus.age}
          </if>
        </foreach>
      </trim>
    </trim>
    <where>
      <foreach collection="list" separator="or" item="cus">
        id = #{cus.id}
      </foreach>
    </where>
</update>

public int updateBatch(List<Object> list){
    if(list ==null || list.size() <= 0){
      return -1;
    }
    SqlSessionFactory sqlSessionFactory = SpringContextUtil.getBean("sqlSessionFactory");
    SqlSession sqlSession = null;
    try {
      sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH,false);
      Mapper mapper = sqlSession.getMapper(Mapper.class);
      int batchCount = 1000;//提交数量,到达这个数量就提交
      for (int index = 0; index < list.size(); index++) {
        Object obj = list.get(index);
        mapper.updateInfo(obj);
        if(index != 0 && index%batchCount == 0){
          sqlSession.commit();
        }          
      }
      sqlSession.commit();
      return 0;
    }catch (Exception e){
      sqlSession.rollback();
      return -2;
    }finally {
      if(sqlSession != null){
        sqlSession.close();
      }
    }
    
}

@Component
public class SpringContextUtil implements ApplicationContextAware{

  private static ApplicationContext applicationContext;

  @Override
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    SpringContextUtil.applicationContext = applicationContext;
  }

  public static ApplicationContext getApplicationContext(){
    return applicationContext;
  }

  public static Object getBean(Class T){
    try {
      return applicationContext.getBean(T);
    }catch (BeansException e){
      return null;
    }
  }

  public static Object getBean(String name){
    try {
      return applicationContext.getBean(name);
    }catch (BeansException e){
      return null;
    }
  }
}