How Can I Efficiently Fetch Oracle's DBMS_OUTPUT Using JDBC?

Fetching DBMS_OUTPUT Using JDBC

When handling database procedures or functions using Java and JDBC, there may be a need to capture output without creating additional objects or altering the database schema. One approach involves utilizing Oracle's DBMS_OUTPUT package.

To retrieve output from DBMS_OUTPUT.get_lines, a JDBC call can be made to a stored procedure like the one below, which includes the necessary steps for enabling buffering, outputting lines, retrieving the lines, and disabling buffering:

declare
  num integer := 1000;  
begin
  dbms_output.enable();
  dbms_output.put_line('abc');
  dbms_output.put_line('hello');
  dbms_output.put_line('so cool'); 
  dbms_output.get_lines(?, num);
  dbms_output.disable();
end;

Within the JDBC code, this procedure can be called using a CallableStatement and the getArray method to fetch the output as an array:

CallableStatement call = c.prepareCall(procedureQuery);
call.registerOutParameter(1, Types.ARRAY, "DBMSOUTPUT_LINESARRAY");
call.execute();

Array array = call.getArray(1);
System.out.println(Arrays.asList((Object[]) array.getArray()));

Another advantage of using DBMS_OUTPUT.get_lines is its bulk transfer capability, significantly reducing the overhead of individual DBMS_OUTPUT.get_line calls. Benchmarking has shown that the bulk approach can be up to 30 times faster than the individual line approach when executed from JDBC.

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