如何解决“语句没有返回结果集错误”？

Question

当语句未返回结果集时，我正在尝试处理 SQLServerException。我还是java新手，所以我无法找到解决它的方法。请任何人都可以建议我如何解决该错误？我遇到困难的地方是当这个存储过程不返回任何结果集并且我想显示类似“未找到记录”的内容时。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

我遇到了同样的问题，经过一些研究，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，然后问题就会解决。

Answer 2

您的程序没有引发任何异常的事实是没有结果不是异常。

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

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

仍然可以通过超类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();
}