完成

src/main/java/com/shr/utils/DBHelper.java

@@ -6,6 +6,8 @@ import java.util.*;
 import javax.servlet.jsp.jstl.sql.*;
 import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
 
+import cn.hutool.core.lang.Console;
+
 public class DBHelper {
 
 private Connection con;  //连接对象
@@ -112,7 +114,23 @@ private Connection con;  //连接对象
 				setSqlValues(pst,sqlValues);
 			}
 		    rst=pst.executeQuery();
+		    if(rst == null)
+		    {
+			    Console.log("executeQuery.rst为空");
+		    }
+		    else
+		    {
+			    Console.log("executeQuery.rst不为空");
+		    }
 		    result=ResultSupport.toResult(rst);  //一定要在关闭数据库之前完成转换
+		    if(result == null)
+		    {
+			    Console.log("executeQuery.result为空");
+		    }
+		    else
+		    {
+			    Console.log("executeQuery.result不为空");
+		    }
 			
 		} catch (SQLException e) {
 			// TODO Auto-generated catch block