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create proc up_sum @a int ,@b int ,@result int output
as
select @result= @a+@b
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...
CallableStatement cstmt=con.prepareCall("exec  up_sum ?,?,?");
cstmt.registerOutParameter(3,java.sql.Types.INTEGER);
       cstmt.setInt(1,10);
       cstmt.setInt(2,20);
       int result=cstmt.getInt(3); 
...
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