小编Ami*_*dat的帖子

我想找出 XML 代码的 XPath 查询，其中city嵌套了要检查条件（是否等于“New York”）的元素 ie，并且bprice未嵌套所需的元素 ie。

这是 XML 代码：

<book>
<btitle>The Inferno</btitle>
<bprice currency = "dollars">19.99</bprice>
<bdate>2013-05-14</bdate>
<authorinfo>
    <lastname>Brown</lastname>
    <midname>G.</midname>
    <firstname>Dan</firstname>
</authorinfo>
<publisherinfo>
    <publishername>Doubleday</publishername>
    <street>1745 Broadway</street>
    <city>New York</city>
    <zip>11119</zip>
    <country>USA</country>
</publisherinfo>
</book>

mouseleave事件能够进行CSS更改,但是当ALT释放密钥时,keyup事件不会执行它应该进行的CSS更改.它干扰了mouseenter吗？如果是,那么如何解决问题？

$(document).on('mouseleave', '.el', function(e) {
  $(this).css("background-color", "white");
  $(this).css("color", "black");

});

$(document).on('keyup', '.el', function(e) {
  if (e.altKey) {
    $(this).css("background-color", "white");
    $(this).css("color", "black");

  }
});

$(document).on('mouseenter keypress', '.el', function(e) {
  if (e.altKey) {

    $(this).css("background-color", "#99DCFC");
    $(this).css("color", "red");

  }

});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table id="t1" align="center" border=1>
  <tr>
    <th>First Name</th>
    <th>Last Name</th>
    <th>Email Address</th>
    <th>Telephone Number</th>
  </tr>
  <tr id="r">
    <tbody>
      <td id="d1" class="el" contenteditable="true"></td>
      <td id="d2" class="el" contenteditable="true"></td>
      <td id="d3" class="el" contenteditable="true"></td>
      <td id="d4" class="el" contenteditable="true"></td>
      <td>
        <button id="del1">Delete</button>
      </td>
    </tbody>
  </tr> …

如果有两个表：

table1具有属性a1, a2, a3和table2具有属性b1, b2, b3。和a1是b1它们各自的主键。当对两个表应用自然联接时，新的主键是什么。合并 a1, b1形成复合主键，否则它们将成为两个单独的候选键

我正在尝试从数据库中删除数据,当从JTable中选择一行并BtnDelete1单击该按钮时.该操作应删除不同表中的行.但是当我单击删除按钮时,所有表中的选定行将被删除,除了"EMAIL_ADDRESSES"表,其中所有行都将被删除.

这是我删除fnumber给定行的存储过程:

CREATE DEFINER=`root`@`localhost` PROCEDURE `delete_contact`(IN fnumber int(2))
BEGIN

DELETE FROM PHONE_NUMBERS
WHERE F_number = fnumber;

DELETE FROM PHYSICAL_ADDRESS
WHERE F_number = fnumber;

DELETE FROM EMAIL_ADDRESSES
WHERE FNumber = fnumber;

DELETE FROM APPOINTMENTS
WHERE Fr_No = fnumber;

DELETE FROM FRIEND
WHERE F_no = fnumber;

END

这是我的按钮BtnDelete1代码:

public class BtnDelete1 extends AbstractAction {


    private FirstSwingApp mainGui;

    public BtnDelete1(FirstSwingApp mainGui) {
        super("Press Me");
        putValue(MNEMONIC_KEY, KeyEvent.VK_P);
        this.mainGui = mainGui;
    }

    public void actionPerformed(ActionEvent e) {

        Object cell …