Mapper 的动态代理作用
目前使用sqlsession进行增删改查的缺点：
[1]没有办法实现多参数的传递
[2]书写的时候没有接口，后期的维护就比较的低
解决的方案：
Mapper的代理方式实现增删改查
接口代码

public interface FlowerMapper {//查询所有操作List<Flower>  selectAll();//修改操作int   insert(Flower  flower);
}//查询Flower selectOne(int id , String name);//Flower selectOne2(    @Param(""uu) int id ,    @Param(""yy) String name);//起别名Flower selectOne3(Flower flower);Flower selectOne4(Flower f1 , Flower f2);

XML中文件

<!--namespace:必须是接口所在的全路径-->
<mapper namespace="com.bjsxt.mapper.FlowerMapper"><!--id的名称和接口中方法必须保持一致--><select id="selectAll" resultType="flower">SELECT  *  from  flower</select><insert id="insert">insert into flower values (DEFAULT ,#{name},#{price},#{production})</insert><select id="selectOne" resultType="flower">select * from flower where id = #{param1} and name = #{param2}</select><select id="selectOne2" resultType="flower">select * from flower where id = #{uu} and name = #{yy}</select><select id="selectOne3" resultType="flower">select * from flower where id = #{id} and name = #{name}</select><select id="selectOne4" resultType="flower">select * from flower where id = #{param1.id} and name = #{param2.name}</select>
</mapper>

测试代码

FlowerMapper mapper = sqlSession.getMapper(FlowerMapper.class);
//查询操作
List<Flower> list = mapper.selectAll();
//添加操作
Flower  f=new Flower();
f.setName("sxt");
f.setPrice(19);
f.setProduction("bj");
int insert = mapper.insert(f);
System.out.println(insert);