发布项目时查询

src/com/hellogithub/dao/githubDao.java

@@ -6,12 +6,10 @@ import com.hellogithub.entity.userEntity;
 import com.hellogithub.utils.JdbcUtils;
 import com.mysql.cj.jdbc.JdbcConnection;
 import org.apache.commons.dbutils.QueryRunner;
+import org.apache.commons.dbutils.handlers.BeanHandler;
 import org.apache.commons.dbutils.handlers.BeanListHandler;
 
-import java.sql.Connection;
-import java.sql.PreparedStatement;
-import java.sql.ResultSet;
-import java.sql.SQLException;
+import java.sql.*;
 import java.util.List;
 
 public class githubDao {
@@ -62,18 +60,24 @@ public class githubDao {
         return back;
     }
 
-    public List<githubEntity> ret_Github_info(int projectid){
+    public ResultSetMetaData ret_Github_info(int projectid) {
         List<githubEntity> githubEntityList;
+        ResultSetMetaData rsmd = null;
         try {
             Connection conn = JdbcUtils.getConnection();
-            QueryRunner runner = new QueryRunner();
+            PreparedStatement prep = null;
+            ResultSet rs = null;
             String sql = "select * from githubinfo where projectId = ? and isValid = 1";
-            githubEntityList = runner.query(conn, sql, new BeanListHandler<>(githubEntity.class), projectid);
+            prep = conn.prepareStatement(sql);
+            prep.setInt(1, projectid);
+            while (rs.next()) {
+                rsmd = rs.getMetaData();
+            }
             conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
-        return githubEntityList;
+        return rsmd;
     }
 
 }

src/com/hellogithub/service/githubService.java

@@ -4,6 +4,7 @@ import com.alibaba.fastjson.JSONObject;
 import com.hellogithub.dao.githubDao;
 import com.hellogithub.entity.githubEntity;
 
+import java.sql.ResultSetMetaData;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -16,12 +17,7 @@ public class githubService {
     }
 
     public String ret_Github_info(int projectId){
-        List<githubEntity> githubEntityList = githubDao.ret_Github_info(projectId);
-        Map<Integer, githubEntity> dataMap = new HashMap<>();
-        for(int i=1;i<githubEntityList.size()+1;i++){
-            githubEntity githubEntity = githubEntityList.get(i);
-            dataMap.put(i,githubEntity);
-        }
-        return JSONObject.toJSONString(dataMap);
+        ResultSetMetaData rsmd = githubDao.ret_Github_info(projectId);
+        return JSONObject.toJSONString(rsmd);
     }
 }

src/com/hellogithub/servlet/githubinfo/ret_Github_infoServlet.java

@@ -35,8 +35,7 @@ public class ret_Github_infoServlet extends HttpServlet {
 
         PrintWriter writer = resp.getWriter();
         String projectid = req.getParameter("projectId");
-        String jsonString = githubservice.ret_Github_info(Integer.parseInt(projectid));
-        writer.println(jsonString);
+        writer.println(githubservice.ret_Github_info(Integer.parseInt(projectid)););
         writer.close();
     }
 }