access解决组合框无法满足大量数据的问题
问题 : Access里面有 组合 框,可以很快地从多行记录中选择所需要的 数据 。但是如果记录超过1000-2000呢?选择就非常不方便了。我该怎么办? 回答: 其实很多 数据 都可以分类(分层)来选择,而且我们可以预先筛选 数据 。 以下这个示例就是用重复打开同
问题:Access里面有组合框,可以很快地从多行记录中选择所需要的数据。但是如果记录超过1000-2000呢?选择就非常不方便了。我该怎么办?
回答:
其实很多数据都可以分类(分层)来选择,而且我们可以预先筛选数据。
以下这个示例就是用重复打开同一个窗体类来完成多层次数据的选择。
当然,还包括预先筛选数据功能。
好了,现在开始:
1、建立一个窗体(testForm),里面有一个文本框(text0),一个按钮(Command2)。
2、建立一个窗体(selectForm),里面有一个列表框(list0)。
3、在testForm中的文本框的“更新后”事件中写入以下代码以打开品名选择窗体(selectForm),并对其中的列表框(list0)的行来源(RowSource)进行赋值。
Private Sub Text0_AfterUpdate()
DoCmd.OpenForm "selectform"
'这行代码就实现了BTYPE表的模糊检索,使用的是 WHERE 子句中的 LIKE 关键字进行通配
Forms("selectform").List0.RowSource = "SELECT btype.soncount, btype.UserCode, btype.FullName, btype.typeId FROM btype WHERE btype.fullname like '*" & Text0.Value & "*' "
End Sub
4、在testForm中的命令按钮的“单击”事件中写入以下代码以打开品名选择窗体,按分类检索
5、然后再在testForm中输入以下代码以完成多次打开窗体本身并显示子类中数据的功能。
为了能够使代码重复利用,写了两个通用过程
Option Compare Database
Dim f
Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)
'先设定窗体的“键预览”属性为“是”
'本过程将加快你的输入速度
'如果按 ESCAPE 键,就关闭窗体
If KeyCode = vbKeyEscape Then
closeAllSelectForm "SelectForm"
End If
End Sub
Private Sub List0_DblClick(Cancel As Integer)
checkYouSelect
End Sub
Private Sub List0_KeyPress(KeyAscii As Integer)
'本过程实现全键盘操作
If KeyAscii = 13 Then
checkYouSelect
End If
End Sub
Sub closeAllSelectForm(strFormName As String)
'通用过程1
'本过程用来关闭所有的指定名称的窗体
For Each objForm In Forms
If objForm.Name = strFormName Then
DoCmd.Close acForm, objForm.Name
End If
Next objForm
End Sub
Sub checkYouSelect()
'通用过程2
'检测你的选择
'如果发现 suncount 列为 0(表示没有下一层了)
'就可以把你选定的产品名称放到文本框中了
On Error Resume Next
Set f = New Form_SelectForm
Dim objForm As Form
If List0.Column(0) = 0 Then
Forms("testform").Text0.Value = List0.Column(2)
closeAllSelectForm "SelectForm"
Else
f.Visible = True
f.List0.RowSource = "SELECT btype.soncount, btype.UserCode, btype.FullName, btype.typeId FROM btype WHERE parid='" & List0.Value & "'"
End If
End Sub

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics











SQL IF statements are used to conditionally execute SQL statements, with the syntax as: IF (condition) THEN {statement} ELSE {statement} END IF;. The condition can be any valid SQL expression, and if the condition is true, execute the THEN clause; if the condition is false, execute the ELSE clause. IF statements can be nested, allowing for more complex conditional checks.

Methods to solve the cross-domain problem of Vue Axios include: Configuring the CORS header on the server side using the Axios proxy using JSONP using WebSocket using the CORS plug-in

How to configure Zend in Apache? The steps to configure Zend Framework in an Apache Web Server are as follows: Install Zend Framework and extract it into the Web Server directory. Create a .htaccess file. Create the Zend application directory and add the index.php file. Configure the Zend application (application.ini). Restart the Apache Web server.

The advantage of multithreading is that it can improve performance and resource utilization, especially for processing large amounts of data or performing time-consuming operations. It allows multiple tasks to be performed simultaneously, improving efficiency. However, too many threads can lead to performance degradation, so you need to carefully select the number of threads based on the number of CPU cores and task characteristics. In addition, multi-threaded programming involves challenges such as deadlock and race conditions, which need to be solved using synchronization mechanisms, and requires solid knowledge of concurrent programming, weighing the pros and cons and using them with caution.

The main reasons why you cannot log in to MySQL as root are permission problems, configuration file errors, password inconsistent, socket file problems, or firewall interception. The solution includes: check whether the bind-address parameter in the configuration file is configured correctly. Check whether the root user permissions have been modified or deleted and reset. Verify that the password is accurate, including case and special characters. Check socket file permission settings and paths. Check that the firewall blocks connections to the MySQL server.

This article describes how to effectively monitor the SSL performance of Nginx servers on Debian systems. We will use NginxExporter to export Nginx status data to Prometheus and then visually display it through Grafana. Step 1: Configuring Nginx First, we need to enable the stub_status module in the Nginx configuration file to obtain the status information of Nginx. Add the following snippet in your Nginx configuration file (usually located in /etc/nginx/nginx.conf or its include file): location/nginx_status{stub_status

The key to PHPMyAdmin security defense strategy is: 1. Use the latest version of PHPMyAdmin and regularly update PHP and MySQL; 2. Strictly control access rights, use .htaccess or web server access control; 3. Enable strong password and two-factor authentication; 4. Back up the database regularly; 5. Carefully check the configuration files to avoid exposing sensitive information; 6. Use Web Application Firewall (WAF); 7. Carry out security audits. These measures can effectively reduce the security risks caused by PHPMyAdmin due to improper configuration, over-old version or environmental security risks, and ensure the security of the database.

Effective monitoring and defense against malicious website access is crucial to the Apache server on the Debian system. Apache access logs are the key source of information to identify such threats. This article will guide you on how to analyze logs and take defensive measures. The Apache access log that identifies malicious access behaviors Debian systems is usually located in /var/log/apache2/access.log. You can analyze the logs in a variety of ways: Log file location confirmation: First, please confirm the exact location of your Apache access log, which may vary slightly depending on the system configuration. Command line tool analysis: Use grep command to search for specific patterns, such as grep "404"
