Question

在vb中如何用ado控件动态地创建数据库

Private Sub Command1_Click() '创建数据库
Dim fm As String 'fm变量用来获取用户输入的文件名
CommonDialog1.Filter = "MDB文件(*.mdb)|*.mdb|AllFiles(*.*)|*.*|"
CommonDialog1.FilterIndex = 1
CommonDialog1.InitDir = "E:\vb例"
CommonDialog1.Flags = 6
CommonDialog1.Action = 2
If CommonDialog1.FileName = "" Then
MsgBox "你必须输入一个文件名，请重新保存一次！"
Exit Sub
Else
fm = CommonDialog1.FileName
End If
pstr = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;" '不能把这里的4.0改为3.51
pstr = pstr & "Data Source=" & fm & ";Persist Security Info=False"
cat.Create pstr '创建数据库
Dim tbl As New Table
cat.ActiveConnection = pstr
tbl.Name = "MyTable" '表的名称
tbl.Columns.Append "编号", adInteger '表的第一个字段
tbl.Columns.Append "姓名", adVarWChar, 8 '表的第二个字段
tbl.Columns.Append "住址", adVarWChar, 50 '表的第三个字段
cat.Tables.Append tbl '建立数据表
conn.Open pstr
rs.CursorLocation = adUseClient
rs.Open "MyTable", conn, adOpenKeyset, adLockPessimistic
rs.AddNew '往表中添加新记录
rs.Fields(0).Value = 9801
rs.Fields(1).Value = "孙悟空"
rs.Fields(2).Value = "广州市花果山"
rs.Update
End Sub

Private Sub Command2_Click() '查询
Set DataGrid1.DataSource = rs

End Sub

Private Sub Command3_Click() '更新
rs.UpdateBatch

End Sub

Private Sub Form_Load()
Dim cat As New ADOX.Catalog '不用cat用另外一个名字也可以
Dim conn As New ADODB.Connection
Dim rs As New ADODB.Recordset
Dim pstr As String '定义该变量是为了后面的书写方便
End Sub
这是参考别人的代码，但是运行时总是在cat.Create pstr '创建数据库
这条语句出错。请高人指点。特急！！！

Answer 1

首先要把Dim cat As New ADOX.Catalog '不用cat用另外一个名字也可以
Dim conn As New ADODB.Connection
Dim rs As New ADODB.Recordset
Dim pstr As String '定义该变量是为了后面的书写方便
放在全局变量定义位置
其次是要删除Persist Security Info=False;

改后为：
Dim cat As New ADOX.Catalog '不用cat用另外一个名字也可以
Dim conn As New ADODB.Connection
Dim rs As New ADODB.Recordset
Dim pstr As String '定义该变量是为了后面的书写方便
Private Sub Command1_Click() '创建数据库
Dim fm As String 'fm变量用来获取用户输入的文件名
CommonDialog1.Filter = "MDB文件(*.mdb)|*.mdb|AllFiles(*.*)|*.*|"
CommonDialog1.FilterIndex = 1
CommonDialog1.InitDir = "E:\vb例"
CommonDialog1.Flags = 6
CommonDialog1.Action = 2
If CommonDialog1.FileName = "" Then
MsgBox "你必须输入一个文件名，请重新保存一次！"
Exit Sub
Else
fm = CommonDialog1.FileName
End If
pstr = "Provider=Microsoft.Jet.OLEDB.4.0;" '不能把这里的4.0改为3.51
pstr = pstr & "Data Source=" & fm '& ";Persist Security Info=False" Persist Security Info=False;
cat.Create pstr '创建数据库
Dim tbl As New Table
cat.ActiveConnection = pstr
tbl.Name = "MyTable" '表的名称
tbl.Columns.Append "编号", adInteger '表的第一个字段
tbl.Columns.Append "姓名", adVarWChar, 8 '表的第二个字段
tbl.Columns.Append "住址", adVarWChar, 50 '表的第三个字段
cat.Tables.Append tbl '建立数据表
conn.Open pstr
rs.CursorLocation = adUseClient
rs.Open "MyTable", conn, adOpenKeyset, adLockPessimistic
rs.AddNew '往表中添加新记录
rs.Fields(0).Value = 9801
rs.Fields(1).Value = "孙悟空"
rs.Fields(2).Value = "广州市花果山"
rs.Update
End Sub
Private Sub Command2_Click() '查询
Set DataGrid1.DataSource = rs
End Sub
Private Sub Command3_Click() '更新
rs.UpdateBatch
End Sub