VB.Net學(xué)習(xí)筆記,使用ADO.Net對象訪問數(shù)據(jù)庫,將結(jié)果寫入ListView
2024-07-10 13:03:13
供稿：網(wǎng)友
public class form1
inherits system.windows.forms.form
#region " windows 窗體設(shè)計(jì)器生成的代碼 "
public sub new()
mybase.new()
'該調(diào)用是 windows 窗體設(shè)計(jì)器所必需的。
initializecomponent()
'在 initializecomponent() 調(diào)用之后添加任何初始化
end sub
'窗體重寫處置以清理組件列表。
protected overloads overrides sub dispose(byval disposing as boolean)
if disposing then
if not (components is nothing) then
components.dispose()
end if
end if
mybase.dispose(disposing)
end sub
'windows 窗體設(shè)計(jì)器所必需的
private components as system.componentmodel.icontainer
'注意：以下過程是 windows 窗體設(shè)計(jì)器所必需的
'可以使用 windows 窗體設(shè)計(jì)器修改此過程。
'不要使用代碼編輯器修改它。
friend withevents button1 as system.windows.forms.button
friend withevents oledbconnection1 as system.data.oledb.oledbconnection
friend withevents oledbcommand1 as system.data.oledb.oledbcommand
friend withevents listview1 as system.windows.forms.listview
private sub initializecomponent()
me.button1 = new system.windows.forms.button()
me.oledbconnection1 = new system.data.oledb.oledbconnection()
me.oledbcommand1 = new system.data.oledb.oledbcommand()
me.listview1 = new system.windows.forms.listview()
me.suspendlayout()
'
'button1
'
me.button1.location = new system.drawing.point(296, 256)
me.button1.name = "button1"
me.button1.size = new system.drawing.size(80, 24)
me.button1.tabindex = 1
me.button1.text = "讀取(&r)"
'
'listview1
'
me.listview1.location = new system.drawing.point(8, 8)
me.listview1.name = "listview1"
me.listview1.size = new system.drawing.size(384, 224)
me.listview1.tabindex = 2
'
'form1
'
me.autoscalebasesize = new system.drawing.size(6, 14)
me.clientsize = new system.drawing.size(408, 293)
me.controls.addrange(new system.windows.forms.control() {me.listview1, me.button1})
me.name = "form1"
me.text = "form1"
me.resumelayout(false)
end sub
#end region
'以上都不用看,是vs.net生成的,下面是我寫的代碼
private sub button1_click(byval sender as system.object, byval e as system.eventargs) handles button1.click
dim datareader as system.data.oledb.oledbdatareader '定義datareader對象
dim i, j, fieldcount as integer
dim tempitem as listviewitem '定義臨時listviewitem對象
oledbconnection1.connectionstring = "provider=microsoft.jet.oledb.4.0;data source=d:/inetpub/wwwroot/mydb.mdb" '設(shè)置連接字符串
oledbconnection1.open()
oledbcommand1.commandtext = "select * from mytable" '設(shè)置命令字符串
oledbcommand1.connection = oledbconnection1
datareader = oledbcommand1.executereader '執(zhí)行sql語句,返回給datareader對象
fieldcount = datareader.fieldcount
listview1.fullrowselect = true
listview1.checkboxes = true
for i = 0 to fieldcount - 1 '枚舉datareader中字段名,添加columns
listview1.view = view.details
listview1.columns.add(datareader.getname(i), 80, horizontalalignment.left)
next
while datareader.read() '獲取記錄信息,寫入listview
tempitem = listview1.items.add(datareader.getvalue(0))
for j = 1 to fieldcount - 1
tempitem.subitems.add(datareader.getvalue(j) & "")
next
end while
datareader.close()
oledbconnection1.close()
end sub
end class
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