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  • 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;
    /

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  • 原文地址:https://www.cnblogs.com/eastsea/p/5279118.html
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