Question

当语句没有返回结果集时，我正在尝试处理SQLServerException。我还是java新手，所以我无法找到解决问题的方法。请问任何人都可以建议我如何解决错误？我遇到困难的地方是这个存储过程没有返回任何结果集，我想显示“找不到记录”之类的东西。我该如何解决？

stmt = conn.prepareCall("{call p_GetAllowedPublicIPs(?,?,?)}");

 @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //processRequest(request, response);
        PrintWriter out = response.getWriter();
        String IsLoginDisabled = null;
         String  BankID =null;
         String publicip=null;
        try {
          //processRequest(request, response);
          Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
          Connection conn = null;
          CallableStatement myStmt = null;
          int count =0;

          conn = DriverManager.getConnection("jdbc:sqlserver://MPESA\\SQL2012;user=realm;password=friend;database=ElmaTest");

          if(conn!=null)
          {
              out.println("Connection Succcesful");
          myStmt = conn.prepareCall("{call sp_GetPortalUser(?,?,?)}");

                myStmt.setString("Country", "Kenya");
                myStmt.setString("BankName", "CS");
                myStmt.setString("UserID", "Frank");

               ResultSet rs= myStmt.executeQuery();
              while(rs.next())       
              {
                  count++;
                  BankID = rs.getString("BankID");
                  String employeeid= rs.getString("EmployeeID");
                  String FirstName = rs.getString("FirstName");
                  String LastName= rs.getString("LastName");
                 String MiddleName = rs.getString("MiddleName");
                 String  Address = rs.getString("Address");
                  String MobileNumber= rs.getString("MobileNumber");
                  String Emailid = rs.getString("EmailID");
                  String TypeofID= rs.getString("TypeOfID");
                 String IDNumber = rs.getString("IDNumber");
                 String ipaddress = rs.getString("IPAddress");
                 IsLoginDisabled = rs.getString("isLoginDisabled");
                 String LoginFailureIPaddress = rs.getString("LoginFailureIPAddress");



                  System.out.println("count"+count);
                  System.out.println("BankID" +BankID);
                  System.out.println("EmployeeId"+employeeid);
                  System.out.println("FirstName"+FirstName);
                  System.out.println("MiddleName"+MiddleName);
                   System.out.println("LastName"+LastName);
                   System.out.println("Address"+Address);
                  System.out.println("MobileNumber"+MobileNumber);
                  System.out.println("EmailId"+Emailid);
                  System.out.println("TypeoFiD"+TypeofID);
                   System.out.println("Idnumber"+IDNumber);
                     System.out.println("ipaddress"+ipaddress);
                  System.out.println("isLoginDisabled"+IsLoginDisabled);
                   System.out.println("LoginFailureIPaddress"+LoginFailureIPaddress);







              }

            if(count>0)
              {
                  int logindisabled = Integer.valueOf(IsLoginDisabled);
                  CallableStatement stmt = null;
                  if (logindisabled!=1)
                  {
                      try {
                          stmt = conn.prepareCall("{call p_GetAllowedPublicIPs(?,?,?)}");
                      } catch (SQLException ex) {
                          Logger.getLogger(LoginController.class.getName()).log(Level.SEVERE, null, ex);
                      }
                   stmt.setString("Country", "Kenya");
                   stmt.setString("BankID", "99");
                   stmt.setString("PublicIP", "1");
                  ResultSet rp = stmt.executeQuery();
                  //  System.out.println(rp.next());
                  while(rp.next())
                  {
                      String ipaddress = rp.getString("IPAddress");
                      System.out.println("ipaddress"+ipaddress);
                  }



                  }
          }





        }
      } catch (ClassNotFoundException | SQLException ex) {
          Logger.getLogger(Search.class.getName()).log(Level.SEVERE, null, ex);
      }









    }

Answer 1

你的程序没有引发任何异常的事实是没有结果也不例外。

您可以使用CallableStatement的execute（）方法。 execute方法将返回一个布尔值，指示是否存在与执行请求相对应的ResultSet。

链接到Javadoc：https://docs.oracle.com/javase/7/docs/api/java/sql/PreparedStatement.html#execute()

您仍然可以使用超类Statement的getResultSet方法获取ResultSet：https://docs.oracle.com/javase/7/docs/api/java/sql/Statement.html#getResultSet()

在您的情况下，您将执行以下操作：

boolean gotResults = myStmt.execute();
ResultSet rs = null;
if(!gotResults){
   System.out.println("No results returned");
} else {
   rs = myStmt.getResultSet();
}

Answer 2

我遇到了同样的问题，经过一些研究后我知道我们必须包括

CREATE PROCEDURE {proc_name} (parameters) 
AS
BEGIN

SET NOCOUNT ON 

...........

----your sqloperations

END

开始你的程序后，你必须包含上面的sql语句，然后问题就会得到解决。

如何解决“语句没有返回结果集错误”？

2 个答案: