vb连接mysql的⽅法_VB⼏种连接数据库的⽅法－、⽤DAO控件连接数据库
1.与Access2000数据库连接
Private Sub Command1_Click()
'也可直接在控件属性中设置以下各项但在控件属性中不能写⼊密码
'只有在数据数没有密码的情况下可以省略
Data1.Refresh
Data1.Connect = "Access 2000;"
Data1.DatabaseName = App. Path +
"\chncmadb.mdb"
'数据库没有密码此句可省
Data1.Connect = ";pwd=123456"
'Data1.RecordSource =
"耕地资源管理单元属性数据表2004"
Data1.RecordSource = "select * from
耕地资源管理单元属性数据表2004"
Data1.Refresh
’move后才能正确显⽰记录个数
End Sub
2.与没有密码的DBF⽂件数据库连接
Private Sub Command2_Click()
Data1.Connect = "dBASE III;"
Data1.DatabaseName = App. Path
' Data1.RecordSource ="DBF"
Data1.RecordSource = "select * from
dbf"
Data1.Refresh
’move后才能正确显⽰记录个数
End Sub
3.与没有密码的Excel⽂件数据库连接
Private Sub Command3_Click()
Data1.Connect = "Excel 8.0;"
Data1.DatabaseName = App.Path &
"\EXcel.xls"
Data1.RecordSource = "select *
from [EXcel.xls]"
Data1.Refresh
’move后才能正确显⽰记录个
End Sub
⼆、⽤DAO代码连接数据库
'在使⽤DAO对象前应选定Visual
Basic菜单下的[⼯程]中的引⽤了菜单中的[Microsoft DAO 3.6 Object Library]选项，或其它版本
1.DAO代码与Access数据库连接
Private Sub Command1_Click()
Dim Db As Database
Dim Rs As Recordset
'以共享、读写⽅式打开'如果⽆密码最后⼀个参数可以不要
Set　Db= OpenDatabase(App.Path &
"\chncmadb.mdb", False, False, ";pwd=123456")
mysql下载app'不需要move来更新记录个数
'Set Rs =
Db.OpenRecordset("耕地资源管理单元属性数据表2004")
'需要move来更新记录个数
Set Rs = Db.OpenRecordset("select * from
[耕地资源管理单元属性数据表2004]")
If Rs.RecordCount > 0 Then
Rs.MoveLast
Rs.MoveFirst
End If
End Sub
2.DAO代码与没有密码的DBF⽂件数据库连接
Private Sub Command2_Click()
Dim Db As Database
Dim Rs As Recordset
'以共享、读写⽅式打开
Set Db = OpenDatabase(App.Path, False, False,
"dbase
III;")
'不需要move来更新记录个数
'Set Rs = Db.OpenRecordset("DBF")
’需要move来更新记录个数
Set Rs = Db.OpenRecordset("select * from [DBF]")
If Rs.RecordCount > 0 Then
Rs.MoveLast
Rs.MoveFirst
End If
End sub
3.
'DAO代码与没有密码的Excel⽂件数据库连接
Private Sub Command3_Click()
Dim Db As Database
Dim Rs As Recordset
'以共享、读写⽅式打开'如果⽆密码最后⼀个参数可以不要Set Db = OpenDatabase(App.Path &
"\EXcel.xls", False, False, "Excel 8.0;")
'不需要move来更新记录个数
' Set Rs = Db.OpenRecordset("EXcel.xls")
'表格中的⼯作⽬录sheet
'需要move来更新记录个数
Set Rs = Db.OpenRecordset("select * from [EXcel.xls]") '表格中的⼯作⽬录sheet'
If Rs.RecordCount > 0 Then
Rs.MoveLast
Rs.MoveFirst
End If
End Sub
三、⽤ADO控件连接数据库
'也可直接在控件属性中设置以下各项
1.ADO控件与Access2000数据库连接
Private Sub Command1_Click()
'连接有密码的Access数据库
'Adodc1.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data
Source=" & App.Path & "\chncmadb1.mdb;Jet OLEDB:DataBase
PASSWORD=123456"
'连接没有密码的Access数据库
Adodc1.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data
Source=" & App.Path & "\chncmadb.mdb;Persist Security
Info=False"
'Adodc1.RecordSource =
"[耕地资源管理单元属性数据表2004]"
Adodc1.RecordSource = "select * from
[耕地资源管理单元属性数据表2004]"
Adodc1.Refresh
Set
DataGrid1.DataSource = Adodc1
DataGrid1.Refresh
End Sub
2.'ADO控件与DBF表连接
Private Sub Command2_Click()
'Adodc1.ConnectionString = "Provider=MSDASQL.1;Persist Security
Info=False;Data Source=dBASE Files;DBQ=" & App.Path &
";SourceType=DBF;"
'Adodc1.ConnectionString = "Provider=MSDASQL.1;Persist Security
Info=False;Extended Properties=DSN=Visual FoxPro
Tables;UID=;SourceDB=”& app.path
&”;SourceType=DBF;Exclusive=No;BackgroundFetch=Yes;Collate=Machine;Null=Yes;Deleted=Yes;" 'Adodc1.ConnectionString = "Provider=MSDASQL.1;Persist Security
Info=False;Extended Properties=DSN=dBASE Files;DBQ=”& app.path
&”;;DefaultDir=”& app.path
&”;DriverId=533;MaxBufferSize=2048;PageTimeout=5;"
'能使表名长度不受限制
Adodc1.ConnectionString = "Provider=MSDASQL.1;Driver=Microsoft
Visual Foxpro Driver;SourceDB=" & App.Path &
";SourceType=DBF;Locale Identifier=2052"
'Adodc1.RecordSource = "[DBF1]"
Adodc1.RecordSource = "select * from DBF1"
Adodc1.Refresh
Set
DataGrid1.DataSource = Adodc1
DataGrid1.Refresh
End Sub
3.'ADO控件与Excel表连接
Private Sub Command3_Click()
'下⾯⼀句测试未能通过
'Adodc1.ConnectionString = "Data
Provider=MSDASQL.1;driver=Microsoft Excel Driver *.xls);DBQ=" &
App.Path & "\EXcel.xls"
'Adodc1.ConnectionString="Provider=MSDASQL.1;Persist Security
Info=False;Extended Properties=DSN=Excel Files;DBQ=" & App.Path
& "\EXcel.xls;DefaultDir=”&app.path
&”;DriverId=790;MaxBufferSize=2048;PageTimeout=5;"
Adodc1.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Persist
Security Info=False;Data Source=" & App.Path &
"\EXcel.xls;Extended Properties='Excel 8.0;HDR=Yes'"
'Adodc1.RecordSource = "[EXcel.xls]"
Adodc1.RecordSource = "select * from [EXcel.xls]"
Adodc1.Refresh
Set
DataGrid1.DataSource = Adodc1
DataGrid1.Refresh
End Sub
4.'ADO控件与Oracle数据库连接
Private Sub Command4_Click()
'Adodc1.ConnectionString =
"Provider=MSDAORA.1;Password=chncmadb;User ID=chncmadb;Data
Source=towebserver;Persist Security Info=True"
Adodc1.ConnectionString="Provider=OraOLEDB.Oracle.1;Password=chncmadb;Persist Security Info=True;User ID=chncmadb;Data

版权声明：本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198，我们将在24小时内删除。