How to set parameter by name instead of its positi

问题:

I'm calling stored procedure from java. Now I need to set the stored procedure's parameter by its name instead of its position inidex, is it doable?

I don't want to use string concatenation though, it's not safe and ugly to deal with.

Notice: I need to work with OUT/INOUT parameters, too.

回答1:

We can name the parameters using the format

cstmt.setString("arg", name);

where cstmt is an CallableStatement

where arg is the name of the argument in the corresponding stored procedure.

We do not need to name parameters in the same order as the arguments in the stored procedure as we will use paramname in this case.

Also you can go through the Tutorial regarding the CallableStatement in the below link -

http://publib.boulder.ibm.com/infocenter/idshelp/v10/index.jsp?topic=/com.ibm.jdbc_pg.doc/jdbc89.htm

You can read the link - the registerOutParameter statement is there in the link -

// Register out parameter which should return the product is created.
  cstmt.registerOutParameter("prod_id", Types.FLOAT);

回答2:

It is feasible, however not natively within the language. You will need to write your own code to provide this functionality or rely upon a third parties code (recommended approach). I have used the simple code from this article in the past with success. It doesn't handle all cases but it is easily extendable. The SpringFramework also provides some libraries to provide this functionality if your looking for a more robust solution.