使用java从sql server存储过程中检索返回的值

Question

Here is my store procedure that returns a value. I need to call this procedure and get that return value into my java program.

 CREATE PROCEDURE my_procedure @advisor de , @adv_xml xml AS begin declare @psrg_idi idi, @adv_cd cd, @CurrDate cdt set @adv_cd = (select adv_cd from dbo.ADVICE_LK where upper(rtrim(adv_de)) = upper(@advisor)) set @psrg_idi = 0 set @CurrDate = getdate() BEGIN TRY exec my_proc_2 @CurrDate,@psrg_idi output insert into ADVICE (psrg_idi, adv_cd, psra_original_xml) values (@psrg_idi, @adv_cd, @adv_xml) select @psrg_idi as psrg_idi END TRY BEGIN CATCH DECLARE @ErrorMessage NVARCHAR(4000); DECLARE @ErrorSeverity INT; DECLARE @ErrorState INT; SELECT @ErrorMessage = ERROR_MESSAGE(), @ErrorSeverity = ERROR_SEVERITY(), @ErrorState = ERROR_STATE(); -- Use RAISERROR inside the CATCH block to return error -- information about the original error that caused -- execution to jump to the CATCH block. RAISERROR (@ErrorMessage, -- Message text. @ErrorSeverity, -- Severity. @ErrorState -- State. ); return -1 END CATCH end 

Here is how I am trying to get this value into my java program returned by the above stored procedure. When I call this procedure from java, all the expected values are stored into database tables. But I am receiving the returned value groupId as '0'.. any idea or help will be highly appreciated.

 CallableStatement cs = con.prepareCall("{? = call my_procedure (?,?)}"); int i = 0; cs.registerOutParameter(++i, java.sql.Types.INTEGER); cs.setString(++i, advisor); cs.setString(++i, adviceXml); cs.execute(); int groupId = cs.getInt(1); 

I have already reviewed the accepted answer https://stackoverflow.com/a/1948518/674476 . I am also trying in the same way, but somehow not able to get returned value

Answer 1

See accepted answer here .

First, you should decide if your SP will return a ResultSet or not. I mean, when you catch an error, you do RETURN -1 . But, if all works fine, you perform a SELECT , which returns a ResultSet.

Said that, if you choose to return a value, you have to do:

CallableStatement cs = con.prepareCall("{? = call my_procedure (?,?)}");                
int i = 0;
cs.registerOutParameter(++i, java.sql.Types.INTEGER);
cs.setString(++i, advisor);
cs.setString(++i, adviceXml);

cs.execute();
int groupId = cs.getInt(1);

But, if you return a ResultSet, you have to do:

CallableStatement cs = con.prepareCall("{call my_procedure (?,?)}");                
int i = 0;
cs.setString(++i, advisor);
cs.setString(++i, adviceXml);

ResultSet rs = cs.executeQuery();
if (rs.next())
    int groupId = rs.getInt(1);

I've tested both methods using a toy SP:

CREATE PROCEDURE my_procedure @v1 int, @v2 int 
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;

    --SELECT @v1 + @v2 as sumVal -- Comment this and uncomment previous line to test Return
RETURN @v1+@v2 -- Comment this and uncomment previous line to test ResultSet
END

Answer 2

Below is the solution to the problem and it works perfectly fine in my case.

CallableStatement cs = con.prepareCall("{call my_procedure(?,?)}");  
int i = 0;
cs.setString(++i, advisor);
cs.setString(++i, adviceXml);

boolean isRs = cs.execute();
int updateCount = cs.getUpdateCount();
// cs.getUpdateCount() will return -1 if the current result is a ResultSet object 
// or there are no more results
// cs.getMoreResults() will return true  if the next result is a ResultSet object; 
// false if it is an update count or there are no more results

while (!isRs && (cs.getUpdateCount() != -1)) {
    isRs = cs.getMoreResults(); 
}

if (isRs) {
    ResultSet rs = cs.getResultSet();
    try {
        if (rs.next()) {
             groupId = rs.getString("psrg_idi");
        }
    } finally {
        rs.close();
    }
}