而重命名一个字段名和删除一个字段、或者增加和删除系统规定的参数这些操作是不可能的。
It is not possible to rename a column, remove a column, or add or remove constraints from a table.
在此，Back按钮应该删除输入到清单8中定义的文本字段中的上一个字符。
In this case, the Back button should remove the last character entered into the text field defined in Listing 8.
为了允许我们选择另一个表，或者另一个字段集，您还应该准备删除在前一循环中添加的TLabel、TDBEdit和TDBMemo控件。
In order to allow us to select another table, or another set of fields, you should also be prepared to remove the TLabel, TDBEdit, and TDBMemo controls that were added in a previous cycle.
Add按钮将新的输入字段附加到表单，Remove 按钮删除上一个字段，Send向服务器提交表单数据。
The Add button appends a new input field to the form, the Remove button deletes the last field, and Send submits the form data to the server.
Add按钮将新的输入字段附加到表单，Remove 按钮删除上一个字段，Send向服务器提交表单数据。
The Add button appends a new input field to the form, the Remove button deletes the last field, and Send submits the form data to the server.
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