diff --git a/src/main/java/com/book/demo/mapper/CartMapper.java b/src/main/java/com/book/demo/mapper/CartMapper.java
index 3e07d40..8092989 100644
--- a/src/main/java/com/book/demo/mapper/CartMapper.java
+++ b/src/main/java/com/book/demo/mapper/CartMapper.java
@@ -1,18 +1,19 @@
 package com.book.demo.mapper;
 
 import com.book.demo.entity.Cart;
-import org.apache.ibatis.annotations.Delete;
-import org.apache.ibatis.annotations.Mapper;
-import org.apache.ibatis.annotations.Select;
+import org.apache.ibatis.annotations.*;
 import org.springframework.stereotype.Repository;
 
 @Repository
 @Mapper
 public interface CartMapper {
-    @Select("select * from user_cart where id=#{id} and username=#{username}")
-    int insertItem(String username,int id);
+    @Insert("insert into user_cart values (#{username},#{bookname})")
+    int insertItem(String username,String bookname);
     @Delete("delete from user_cart where username=#{username}")
     void clearCart(String username);
     @Select("select * from user_cart where username=#{username}")
     Cart queryByName(String username);
+    @Update({"update user_cart set username=#{username}", "update user_cart set bookname=#{bookname}", "update user_cart set count=#{count}"})
+    int updateCount(String username,String bookname,int count);
+
 }