PLSQL 逻辑多线程机制

CREATE OR REPLACE PACKAGE jv_para_pkg IS

  PROCEDURE main(i_job_name   VARCHAR2,
                 i_job_action VARCHAR2,
                 i_job_count  NUMBER);

END jv_para_pkg;
/
CREATE OR REPLACE PACKAGE BODY jv_para_pkg IS

  -- 释放一个job
  PROCEDURE release_one_job(i_job_name VARCHAR2, i_job_action VARCHAR2) IS
 
  BEGIN
    dbms_scheduler.create_job(job_name   => i_job_name,
                              job_type   => 'PLSQL_BLOCK',
                              job_action => i_job_action,
                              enabled    => TRUE);
  END;

  --清除job运行历史
  PROCEDURE purge_job_log(i_job_name_prefix VARCHAR2) IS
 
    CURSOR job_cur IS
      SELECT DISTINCT job_name
        FROM user_scheduler_job_run_details
       WHERE job_name LIKE i_job_name_prefix;
  BEGIN
    FOR job_rec IN job_cur LOOP
      dbms_scheduler.purge_log(log_history => 1,
                               which_log   => 'JOB_AND_WINDOW_LOG',
                               job_name    => job_rec.job_name);
    END LOOP;
  END;

  PROCEDURE main(i_job_name   VARCHAR2,
                 i_job_action VARCHAR2,
                 i_job_count  NUMBER) IS
 
    v_count NUMBER;
  BEGIN
    dbms_output.put_line(i_job_action);
    WHILE TRUE LOOP
      FOR i IN 1 .. i_job_count LOOP
        SELECT COUNT(1)
          INTO v_count
          FROM user_scheduler_jobs t
         WHERE t.job_name = i_job_name || '_' || i;
        IF v_count = 0 THEN
          release_one_job(i_job_name   => i_job_name || '_' || i,
                          i_job_action => i_job_action);
          -- 找到即退出
          RETURN;
        END IF;
      END LOOP;
      -- 等待
      dbms_lock.sleep(1);
    
    END LOOP;
    --清除job运行历史
    purge_job_log(i_job_name || '_%');
  END;
END jv_para_pkg;
/