ADD file via upload

HelloTeacher.java

@@ -0,0 +1,21 @@
+package com.example.demo.controller;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+import java.util.List;
+import java.util.Map;
+@Controller
+public class HelloTeacher {
+    @Autowired
+    JdbcTemplate jabcTemplate;
+    @ResponseBody
+    @GetMapping("/query")
+    public Map<String,Object> map(){
+        List<Map<String,Object>> list=jabcTemplate.queryForList("select * from newteacher");
+        return list.get(0);
+    }
+}