diff --git a/src/main/java/com/dao/UserInfoDao.java b/src/main/java/com/dao/UserInfoDao.java
new file mode 100644
index 0000000..4dfb85d
--- /dev/null
+++ b/src/main/java/com/dao/UserInfoDao.java
@@ -0,0 +1,18 @@
+package com.example.dao;
+
+import com.example.entity.UserInfo;
+import com.example.vo.UserInfoVo;
+import org.apache.ibatis.annotations.Param;
+import org.springframework.stereotype.Repository;
+import tk.mybatis.mapper.common.Mapper;
+
+import java.util.List;
+
+@Repository
+public interface UserInfoDao extends Mapper<UserInfo> {
+    List<UserInfoVo> findByName(@Param("name") String name);
+    
+    int checkRepeat(String column, String value, Long id);
+    UserInfoVo findByUsername(String username);
+    Integer count();
+}