我如何从MySQL到Java（jdbc）使用@

Question

I can use @ in mysql. But I can't use @ in java(jdbc). Could you give some advice?

mysql (working very well)

select ssn from (select * from EMPLOYEE)EMPLOYEE_sorted,(select 
@pv='888665555') initialisation where find_in_set(superssn,@pv) and length(@pv 
:= concat(@pv,',',ssn));

java (jdbc) doesn't work

String query = "select ssn from (select * from EMPLOYEE)EMPLOYEE_sorted, 
(select @pv=888665555) initialisation where find_in_set(superssn,@pv) and length(@pv := concat(@pv,',',ssn))"

Answer 1

To set this you may create a PreparedStatement and assign '?' wherever you want to place the @xxxxxx.

To set the values inside the '?' you have to use the command

setString()/setInt()/set<variable>();

This is more clear when I show you an example.

PreparedStatement p = con.prepareStatement("select * from people where 
(first_name = ? or last_name = ?) and address = ?");
p.setString(1, name);
p.setString(2, name);
p.setString(3, address);

Here is the link to the sample.