如果edittext为空，如何排除或设置某个参数的null

Question

I have a stored procedure with alot of parameters for filtering i have 2 edittext Cardnumber and Carcode and both of thoose have to be filled before i can get any results

so my question is how do i get the result if one of them is empty or if they both are empty

 protected String doInBackground(String... params) {
                try {
                    Connection con = connectionClass.CONN();
                    if (con == null) {
                        z = "Error in connection with SQL server";
                    } else {
                        doerTicket = setingPreferences.getString("doerTicket", "");
                        CallableStatement cs = null;
                        String query = "exec [file].[usp_getParts] \n@p_ItemNumber = ?,\n@p_DoerTicket = ?,\n@p_CarItemNumber = ?;
                        cs = con.prepareCall(query);
                        cs.setString(1, Cardnumber);//edittext(@p_ItemNumber)
                        cs.setString(2, doerTicket);
                        cs.setString(3, Carcode);//edittext(@p_CarItemNumber)
                        ResultSet rs = cs.executeQuery();
                        while (rs.next()) {

                    }
                } catch (Exception ex) {
                    z = "Exceptions";
                }
                return z;

            }
        }

the parameter i currently use in the sp

ALTER PROCEDURE [file].[usp_getParts]
    , @p_ItemNumber VARCHAR ( 3000 ) = NULL
    , @p_CarItemNumber NVARCHAR ( 20 ) = NULL
    , @p_DoerTicket VARCHAR ( 200 ) = NULL

with itemnumber with carcode

or i can also get the result by using

EXEC    @return_value = [file].[usp_getParts]
        @p_CarItemNumber  = NULL,
        @p_ItemNumber = N'*****',
        @p_DoerTicket = N'0x01000000f475bad9ea7d1f1d6b142a1b8cc95ce74b3f387cb1388a80097f35a8c1e9131ffa7f4b833553bede4a3abec49254373d06fb3294c60c6d24',
        @p_SearchSessionID = @p_SearchSessionID OUTPUT,
        @p_TotalRows = @p_TotalRows OUTPUT

Answer 1

I don't think you can remove any parameter from a statement; I suggest you to use a wildcard for setting statement parameters which are not passed to the function:

CallableStatement cs = null;
String query = "exec [file].[usp_getParts] \n@p_ItemNumber = ?,\n@p_DoerTicket = ?,\n@p_CarItemNumber = ?";
cs = con.prepareCall(query);
cs.setString(1, Cardnumber != null ? Cardnumber : "*");//edittext(@p_ItemNumber)
cs.setString(2, doerTicket != null ? doerTicket : "*");
cs.setString(3, Carcode != null ? Carcode : "*");//edittext(@p_CarItemNumber)
ResultSet rs = cs.executeQuery();

This way you can have a single query to extract data with any filter combination.

If you don't want to contact the datasource if some filter is not passed, you could simply check them before preparing the statement and return an error string (or maybe better throw an application exception).