Stored Procedure Returning Null

Question

This question is similar to: Mysql - Stored procedure OUT variable return null , sadly their solutions did not work for me.

I have a database populated with data about who used my program and when, and I am trying to create a stored procedure in MySql to retrieve all the data and send it to my java servlet, where it will be processed.

This is what I have currently for my Stored Procedure:

CREATE DEFINER=`root`@`localhost` 

PROCEDURE `getTableData`(OUT time VARCHAR(45), OUT fName VARCHAR(45), 
                        OUT lName VARCHAR(45), OUT rVar INT)

BEGIN
    SELECT rqTime, name, lastName, requestVar FROM pdata.userlist;

END

Here is how I call the query in Java:

CallableStatement stmt = null;
ResultSet rs = null;        
String sqlQuery = "{call getTableData (?, ?, ?, ?)}";       
stmt = conn.prepareCall(sqlQuery);

    stmt.registerOutParameter(1, java.sql.Types.VARCHAR);
    stmt.registerOutParameter(2, java.sql.Types.VARCHAR);
    stmt.registerOutParameter(3, java.sql.Types.VARCHAR);
    stmt.registerOutParameter(4, java.sql.Types.INTEGER);

stmt.execute();

When I try to call this stored procedure in Java (I've tried using result sets and the normal getString(), etc) all values return null.

My table design is along the lines of:

Request Time (millis), name, lastName, requestID 

1402341252155, John, Doe, 11

Any help would be greatly appreciated. I feel as though the problem lies in the stored procedure itself, particularly the how I select the variables from the the table and assign them to the "out" parameters.

Thanks!

Answer 1

The problem is that you never set the values for your out parameters in your procedure. Fix your query:

SELECT
    rqTime, name, lastName, requestVar
INTO
    time, fName, lName, rVar
FROM pdata.userlist;
-- Probably you need a WHERE or another statement to make sure you only retrieve 1 row as result
-- Otherwise, this stored procedure will fail

Also, in Java side, you should register the out parameters and retrieve the results directly from CallableStatement , do not retrieve them from a ResultSet .

Answer 2

public static  List<MonhthyBranchWiseSalesPurchesesDTO> getMonBranWiseDetails(Connection con){

    List<MonhthyBranchWiseSalesPurchesesDTO> monhthyBranchWiseSalesPurchesesDTOList = null;
    ResultSet rset=null;
    CallableStatement proc_stmt = null;
    CachedRowSet cRowSet = null;

    try{        
        MonhthyBranchWiseSalesPurchesesDTO objTarget = new MonhthyBranchWiseSalesPurchesesDTO();
     System.out.println("okkkkhhhh");
        proc_stmt = con.prepareCall("xremit.dbo.p_getBHDMBReport"); 
        //p_getBHDMBReport
        //proc_stmt = con.prepareCall("uaeexdw.dbo.DBA.p_getBHDMBReport");

        rset = proc_stmt.executeQuery();
        System.out.println("after   ------");
        cRowSet = new CachedRowSetImpl();
        cRowSet.populate(rset);

        System.out.println("lll");
        monhthyBranchWiseSalesPurchesesDTOList = (List) ResultSetUtils.getCollection(objTarget, cRowSet);


    }