如何判断vb文件是空的,vb如何判断是文件夹还是文件

首页 > 实用技巧 > 作者:YD1662024-01-08 20:53:44

前端程序

前端程序开发平台为VB6.0,编程语言为Visual Basic

窗体

系统登录

如何判断vb文件是空的,vb如何判断是文件夹还是文件(1)

Private Sub Command登录_Click()

Dim 账号text As String '定义变量存储账号

Dim 密码text As String '定义变量存储密码

If Trim(Me.Text账号) <> "" Then '输入账号不能为空

账号text = Me.Text账号 '存储录入账号到变量中(可拓展更多判断,如字符长度等)

Else

MsgBox "账号不能为空!"

Exit Sub

End If

If Trim(Me.Text密码) <> "" Then '输入密码不能为空

If Len(Trim(Me.Text密码)) < 6 Then

MsgBox "密码长度不能小于6位!"

Exit Sub

End If

密码text = Me.Text密码 '存储录入密码到变量中(可拓展更多判断,如字符长度等)

Else

MsgBox "密码不能为空!"

Exit Sub

End If

'-账号密码验证

Dim login_conn As New ADODB.Connection '连接到ACCESS数据库

With login_conn 'mdb格式连接

.ConnectionString = "Provider = microsoft.jet.oledb.4.0;data source=" & App.Path & "\db_rw.mdb;Jet OLEDB:DataBase password=abc123;persist security info=false"

.Open

End With

Dim login_rs As New ADODB.Recordset

Dim login_sql As String

login_sql = "select * from 账号表 where 账号= '" & Me.Text账号 & "' and 密码='" & Me.Text密码 & "'" '查询用户表

login_rs.Open login_sql, login_conn, adOpenDynamic, adLockOptimistic

If login_rs.EOF = False Then '循环表的内容

'--

On Error Resume Next

login_name = login_rs.Fields("账号").Value '账号密码赋值到公共变量之后使用

login_pw = login_rs.Fields("密码").Value

user_name = login_rs.Fields("姓名").Value

user_role = login_rs.Fields("角色").Value

全部任务权限 = login_rs.Fields("全部任务").Value

任务查看权限 = login_rs.Fields("任务查看").Value

任务添加权限 = login_rs.Fields("任务添加").Value

任务更新权限 = login_rs.Fields("任务更新").Value

任务删除权限 = login_rs.Fields("任务删除").Value

常见任务管理权限 = login_rs.Fields("常见任务管理").Value

负责人管理权限 = login_rs.Fields("负责人管理").Value

任务类型管理权限 = login_rs.Fields("任务类型管理").Value

任务状态管理权限 = login_rs.Fields("任务状态管理").Value

MsgBox "登录成功", , "提示"

Unload Me '关闭登录窗体

frm系统主页.Show

Else

MsgBox "账号或密码错误,请重新登录"

login_count = login_count 1 '登录错误3次,退出

If login_count = 3 Then

MsgBox "账号或密码错误达3次"

Unload Me

End If

End If

login_rs.Close

Set login_rs = Nothing

login_conn.Close

Set login_conn = Nothing

Exit Sub

登录失败错误:

MsgBox Err.Description

End Sub

Private Sub Command退出_Click()

Unload Me

End Sub

Private Sub Command用户注册_Click()

frm用户注册.Show 1

End Sub

系统主页

如何判断vb文件是空的,vb如何判断是文件夹还是文件(2)

Private Sub cjrw_Click(Index As Integer)

If 常见任务管理权限 = False Then

MsgBox "无权限"

Exit Sub

End If

frm常见任务.Show 1

End Sub

Private Sub fhdl_Click()

Unload Me

frm系统登录.Show

login_name = ""

login_pw = ""

user_name = ""

user_role = ""

全部任务权限 = False

任务查看权限 = False

任务添加权限 = False

任务更新权限 = False

任务删除权限 = False

常见任务管理权限 = False

负责人管理权限 = False

任务类型管理权限 = False

任务状态管理权限 = False

End Sub

Private Sub Form_Load()

StatusBar1.Panels(2).Text = login_name

StatusBar1.Panels(3).Text = user_name

StatusBar1.Panels(4).Text = user_role

Label日期.Caption = Date

'当前登录用户添加的任务

Adodc1.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & App.Path & "\db_rw.mdb;Jet OLEDB:DataBase password=abc123;Persist Security Info=False"

Adodc1.CommandType = adCmdUnknown

Adodc1.RecordSource = "Select * From 今日任务查询 where " & "创建账号 ='" & login_name & "'"

Adodc1.Refresh '刷新

End Sub

Private Sub fzr_Click(Index As Integer)

If 负责人管理权限 = False Then

MsgBox "无权限"

Exit Sub

End If

frm负责人.Show 1

End Sub

Private Sub grxx_Click()

frm个人信息.Show 1

End Sub

Private Sub qbrw_Click(Index As Integer)

If 全部任务权限 = False Then

MsgBox "无权限"

Exit Sub

End If

frm全部任务.Show 1

End Sub

Private Sub rwcx_Click(Index As Integer)

If 任务查看权限 = False Then

MsgBox "无权限"

Exit Sub

End If

frm任务查询.Show 1

End Sub

Private Sub rwlx_Click(Index As Integer)

If 任务类型管理权限 = False Then

MsgBox "无权限"

Exit Sub

End If

frm任务类型.Show 1

End Sub

Private Sub rwtj_Click(Index As Integer)

If 任务添加权限 = False Then

MsgBox "无权限"

Exit Sub

End If

frm任务添加.Show 1

End Sub

Private Sub rwzt_Click(Index As Integer)

If 任务状态管理权限 = False Then

MsgBox "无权限"

Exit Sub

End If

frm任务状态.Show 1

End Sub

Private Sub tcxt_Click()

Unload Me

End Sub

Private Sub xgmm_Click()

frm修改密码.Show 1

End Sub

常见任务

如何判断vb文件是空的,vb如何判断是文件夹还是文件(3)

Option Explicit

Public frm_title As String '存储窗体标题

Public frm_datatype As Integer '存储当前管理状态(添加,修改,查询)

Public key_data As String '存储修改主键

Dim search_filter As String '存储筛选条件

Dim search_order As String '存储排序条件

Private Sub Command保存_Click()

On Error GoTo 保存失败错误

'========================================================================为添加状态时

If frm_datatype = 1 Then

'判断数据不能为空

If Text1(0).Text <> "" Then

'满足条件添加记录

'----------------------------------

Dim add_conn As New ADODB.Connection '连接数据

Dim add_rs As New AdoDB.Recordset

With add_conn

.ConnectionString = "Provider = microsoft.jet.oledb.4.0;data source=" & App.Path & "\db_rw.mdb;Jet OLEDB:DataBase password=abc123;persist security info=false"

.Open

End With

add_rs.Open "常见任务表", add_conn, adOpenKeyset, adLockOptimistic '连接表生成记录集

add_rs.AddNew '添加记录

On Error Resume Next

add_rs!任务名称 = Text1(0).Text '新记录赋值

add_rs.Update '更新

add_rs.Close '关闭清空记录集和连接

Set add_rs = Nothing

add_conn.Close

Set add_conn = Nothing

MsgBox "添加完成"

Text1(0).Text = ""

Adodc1.Refresh '刷新显示结果

DataGrid1.Refresh

Text1(0).SetFocus '第一个录入数据控件获得焦点继续录入

'----------------------------------

Else

MsgBox "任务名称不能为空"

Exit Sub

End If

End If

'========================================================================为修改状态时

If frm_datatype = 2 Then

'判断数据不能为空

If Text1(0).Text <> "" Then

'判断主键不能重复

If key_data <> Text1(0).Text Then '主键修改,判断主键是否重复

If dcountlink("任务名称", "常见任务表", "任务名称='" & Text1(0) & "'", 0) > 0 Then

MsgBox "该任务名称已存在,请修改后重试"

Exit Sub

End If

End If

'满足条件添加记录

'----------------------------------

'连接数据库并更新

Dim update_conn As New ADODB.Connection

Dim update_rs As New ADODB.Recordset

With update_conn

.ConnectionString = "Provider = microsoft.jet.oledb.4.0;data source=" & App.Path & "\db_rw.mdb;Jet OLEDB:DataBase password=abc123;persist security info=false"

.Open

End With

Dim update_sql As String

update_sql = "Select * From 常见任务表 Where 任务名称='" & key_data & "'"

update_rs.Open update_sql, update_conn, adOpenKeyset, adLockOptimistic

'--字段更新

On Error Resume Next

With update_rs

!任务名称 = Text1(0).Text '新记录赋值

End With

update_rs.Update

update_rs.Close

Set update_rs = Nothing

update_conn.Close

Set update_conn = Nothing

key_data = Text1(0) '主键赋值

MsgBox "更新完成!"

Adodc1.Refresh '刷新显示结果

DataGrid1.Refresh

Text1(0).SetFocus '第一个录入数据控件获得焦点

'----------------------------------

Else

MsgBox "任务名称不能为空"

Exit Sub

End If

End If

Exit Sub

保存失败错误:

MsgBox Err.Description

End Sub

Private Sub Command取消_Click()

frm_datatype = 5

Call changetitle(frm_datatype)

Dim i '清空控件中的数据

For i = 1 To Text1.Count

Text1(i - 1).Text = ""

Next i

'点击取消时显示全部记录,清空条件

search_filter = ""

Adodc1.Refresh

DataGrid1.Refresh

End Sub

Private Sub Command删除_Click()

On Error GoTo 删除失败错误

Dim del_data As String

del_data = DataGrid1.Columns(0).Text

If MsgBox("是否删除任务名称为【" & del_data & "】 的记录?", vbYesNo, "提示") <> vbYes Then '删除前提醒

Exit Sub

End If

'执行删除操作

Dim del_conn As New ADODB.Connection

Dim del_sql As String

del_sql = "delete from 常见任务表 Where 任务名称='" & del_data & "'" '定义删除sql语句

With del_conn

.ConnectionString = "Provider = microsoft.jet.oledb.4.0;data source=" & App.Path & "\db_rw.mdb;Jet OLEDB:DataBase password=abc123;persist security info=false"

.Open

.Execute del_sql '执行删除

End With

del_conn.Close

Set del_conn = Nothing

MsgBox "删除成功"

Adodc1.Refresh '刷新显示结果

DataGrid1.Refresh

Exit Sub

删除失败错误:

MsgBox Err.Description

End Sub

Private Sub Command添加_Click()

frm_datatype = 1

Call changetitle(frm_datatype)

Dim i

For i = 1 To Text1.Count '控件取消锁定可录入数据

Text1(i - 1).Text = ""

Text1(i - 1).Locked = False

Next i

Text1(0).Locked = False

Text1(0).SetFocus '第一个控件获得焦点

End Sub

Private Sub Command修改_Click()

key_data = 0

frm_datatype = 2

Call changetitle(frm_datatype)

End Sub

Private Sub DataGrid1_DblClick()

If frm_datatype <> 2 Then '判断是否为修改状态

MsgBox "需要修改数据,请先进入修改状态"

Exit Sub

End If

Dim i

For i = 0 To Text1.UBound '获取选择记录的数据

Text1(i).Text = DataGrid1.Columns(i).Text

Next i

'解除锁定(数据可编辑)

For i = 0 To Text1.UBound

Text1(i).Locked = False

Next i

Text1(0).Locked = False

Text1(0).SetFocus

key_data = Text1(0).Text '主键赋值

End Sub

Private Sub Form_Load() '窗体加载

frm_title = "常见任务管理" '赋值标题到变量

frm_datatype = 5 '设置窗体当前管理数据类型

Call changetitle(frm_datatype)

Dim i

For i = 1 To Text1.Count '控件锁定不可录入数据

Text1(i - 1).Text = ""

Text1(i - 1).Locked = True

Next i

Adodc1.Refresh '刷新

End Sub

Private Sub Text1_GotFocus(Index As Integer) '文本框获得焦点,背景色修改,选中原有文本

Text1(Index).BackColor = &HFFFF00

Text1(Index).SelStart = 0

Text1(Index).SelLength = Len(Text1(Index))

End Sub

Private Sub Text1_LostFocus(Index As Integer) '文本框失去焦点设计填充颜色(恢复)

Text1(Index).BackColor = &H80000005

End Sub

Sub changetitle(ByVal frmdatatype As Integer) '根据状态显示不同标题,设置按钮状态

Select Case frmdatatype

Case 1 '添加

Me.Caption = frm_title & "(添加)"

'按钮状态设置

Me.Command添加.Enabled = False

Me.Command修改.Enabled = False

Me.Command保存.Enabled = True

Me.Command取消.Enabled = True

Me.Command删除.Enabled = False

Case 2 '添加

Me.Caption = frm_title & "(修改)"

'按钮状态设置

Me.Command添加.Enabled = False

Me.Command修改.Enabled = False

Me.Command保存.Enabled = True

Me.Command取消.Enabled = True

Me.Command删除.Enabled = False

Case 3 '删除

Me.Caption = frm_title

Case 5 '取消

Me.Caption = frm_title

'按钮状态设置

Me.Command添加.Enabled = True

Me.Command修改.Enabled = True

Me.Command保存.Enabled = False

Me.Command取消.Enabled = True

Me.Command删除.Enabled = True

key_data = 0

'锁定所有控件

Dim i

For i = 0 To Text1.UBound

Text1(i).Locked = True

Next i

Case Else

Me.Caption = frm_title

'按钮状态设置

Me.Command添加.Enabled = False

Me.Command修改.Enabled = False

Me.Command保存.Enabled = False

Me.Command取消.Enabled = False

Me.Command删除.Enabled = False

End Select

End Sub

常见任务选择

如何判断vb文件是空的,vb如何判断是文件夹还是文件(4)

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