Question

首先选择具有悲观锁定的所有行，然后更新每一行。第二个做同样的事情。我认为第二次尝试应该失败，但它只是工作正常。如何进行第二次尝试失败？

<!DOCTYPE html>
    <html lang="en-US">
    <head>
    <style>
    .city {
        float: left;
        margin: 5px;
        padding: 15px;
        width: 300px;
        height: 300px;
        border: 1px solid black;
    }
    </style>
    </head>
    <body>

    <h1>W3Schools Demo</h1>
    <h2>Resize this responsive page!</h2>

    <div class="city">
      <h2>London</h2>
      <p>London is the capital city of England.</p>
      <p>It is the most populous city in the United Kingdom, with a metropolitan area of over 13 million inhabitants.</p>
    </div>

    <div class="city">
      <h2>Paris</h2>
      <p>Paris is the capital and most populous city of France.</p>
    </div>

    <div class="city">
      <h2>Tokyo</h2>
      <p>Tokyo is the capital of Japan, the center of the Greater Tokyo Area, and the most populous metropolitan area in the world.</p>
    </div>

    </body>
    </html>

JPA JPQL Lock无法正常工作

0 个答案: