Mybatis配置Mapper.docVIP

Mybatis配置Mapper?我们知道在Mybatis中定义Mapper信息有两种方式，一种是利用xml写一个对应的包含Mapper信息的配置文件；另一种就是定义一个Mapper接口，然后定义一些相应的操作方法，再辅以相应的操作注解。 ???????现假设我有这样一个实体类： Java代码?? package?com.tiantian.mybatis.model;?? ??? public?class?User?{?? ??? ????private?int?id;?? ????private?String?name;?? ????private?int?age;?? ????public?int?getId()?{?? ???????return?id;?? ????}?? ????public?void?setId(int?id)?{?? ???????this.id?=?id;?? ????}?? ????public?String?getName()?{?? ???????return?name;?? ????}?? ????public?void?setName(String?name)?{?? ????????=?name;?? ????}?? ????public?int?getAge()?{?? ???????return?age;?? ????}?? ????public?void?setAge(int?age)?{?? ???????this.age?=?age;?? ????}?? ????? }?? ? ???????它对应的数据库表结构是这样的： ? 然后我要利用Mybatis对它做一个简单的增删改查操作，那么如果利用xml配置Mapper的方式来定义的话，我对应的UserMapper.xml文件会是这样： Xml代码?? ?xml?version=1.0?encoding=UTF-8???? !DOCTYPE?mapper?? ??PUBLIC?-////DTD?Mapper?3.0//EN?? ??/dtd/mybatis-3-mapper.dtd?? ??? mapper?namespace=com.tiantian.mybatis.mapper.UserMapper?? ????insert?id=insertUser?parameterType=User?useGeneratedKeys=true?keyColumn=id?? ???????insert?into?t_user(name,?age)?values(#{name},?#{age})?? ????/insert?? ????? ????update?id=updateUser?parameterType=User?? ???????update?t_user?set?name=#{name},?age=#{age}?where?id=#{id}?? ????/update?? ????? ????select?id=findById?parameterType=int?resultType=User?? ???????select?*?from?t_user?where?id=#{id}?? ????/select?? ????? ????delete?id=deleteUser?parameterType=int?? ???????delete?from?t_user?where?id=#{id}?? ????/delete?? /mapper?? ? ???????如果使用接口加注解的方式，那么我们的UserMapper接口应该这样定义： Java代码?? package?com.tiantian.mybatis.mapperinterface;?? ??? import?org.apache.ibatis.annotations.Delete;?? import?org.apache.ibatis.annotations.Insert;?? import?org.apache.ibatis.annotations.Select;?? import?org.apache.ibatis.annotations.Update;?? ??? import?com.tiantian.mybatis.model.User;?? ??? public?interface?UserMapper?{?? ??? ????@Insert(insert?into?t_user(name,?age)?values(#{name},?#{age}))?? ????public?void?insertUser(User?user);?? ????