警惕，MyBatis的size()方法竟然有坑！

多线程并发环境下的压测代码

String resource = "mybatis-config.xml"; 
        InputStream in = null; 
        try { 
            in = Resources.getResourceAsStream(resource); 
            SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in); 
            final List<Long> ids = Collections.singletonList(1L); 
            final SqlSession session = sqlSessionFactory.openSession(); 
            final CountDownLatch mCountDownLatch = new CountDownLatch(1); 
            for (int i = 0; i < 50; i++) { 
                Thread thread = new Thread(new Runnable() { 
                    public void run() { 
                        try { 
                            mCountDownLatch.await(); 
                        } catch (InterruptedException e) { 
                            e.printStackTrace(); 
                        } 
                        for (int k = 0; k < 100; k++) { 
                            session.selectList("CompanyMapper.getCompanysByIds", ids); 
                        } 
                    } 
                }); 
                thread.start(); 
            } 
            mCountDownLatch.countDown(); 
            synchronized (MybatisBugTest.class) { 
                try { 
                    MybatisBugTest.class.wait(); 
                } catch (InterruptedException e) { 
                    e.printStackTrace(); 
                } 
            } 
 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } catch (Throwable e) { 
            e.printStackTrace(); 
        } finally { 
            if (in != null) 
                try { 
                    in.close(); 
                } catch (IOException e) { 
                    e.printStackTrace(); 
                } 
        } 

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