使用sql标签 实现以下方法 批量插入 int insertUsers(List<User> users) int insertUsers(@Param("users")List<User> users) 根据id来修改，当user中有值的时候就修改，当user中没有值的时候不修改 int updateSelectiveUser(@Param("user")User user) in查询 List<User> selectUserListByIds(List<Integer> ids); 根据条件查询,user成员变量有空值 List<User> selectUserListByUser(@Param("user") User user); 插入并获取主键Id(需要用到还没有讲到的selectkey) int insertUser(@Param("user") User user);

好的，以下是使用SQL标签实现以上方法的代码：

@Mapper
public interface UserDao {

    @Insert({
            "<script>",
            "insert into user(name, age, gender) values ",
            "<foreach item='user' index='index' collection='users' separator=','>",
            "(#{user.name}, #{user.age}, #{user.gender})",
            "</foreach>",
            "</script>"
    })
    int insertUsers(@Param("users") List<User> users);

    @Update({
            "<script>",
            "update user set",
            "<if test='user.name != null'> name = #{user.name},</if>",
            "<if test='user.age != null'> age = #{user.age},</if>",
            "<if test='user.gender != null'> gender = #{user.gender},</if>",
            "</script>"
    })
    int updateSelectiveUser(@Param("user") User user);

    @Select({
            "<script>",
            "select * from user where id in ",
            "<foreach item='id' index='index' collection='ids' open='(' separator=',' close=')'>",
            "#{id}",
            "</foreach>",
            "</script>"
    })
    List<User> selectUserListByIds(@Param("ids") List<Integer> ids);

    @Select({
            "select * from user where 1=1 ",
            "<if test='user.name != null'> and name=#{user.name}</if>",
            "<if test='user.age != null'> and age=#{user.age}</if>",
            "<if test='user.gender != null'> and gender=#{user.gender}</if>",
    })
    List<User> selectUserListByUser(@Param("user") User user);

    @Insert({
            "insert into user(name, age, gender) values (#{user.name}, #{user.age}, #{user.gender})",
    })
    @SelectKey(statement = "SELECT LAST_INSERT_ID()", keyProperty = "user.id", before = false, resultType = Integer.class)
    int insertUser(@Param("user") User user);
}

希望能够帮到你！