大家好，又见面了，我是你们的朋友全栈君。
今日连接数据库，写下以下代码
![OleDbCommand执行查询无效的解决[通俗易懂]](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![OleDbCommand执行查询无效的解决[通俗易懂]](https://javaforall.net/wp-content/uploads/2020/11/2020110817443450.jpg)
Dim
conn
As
New
OleDbConnection
Dim
cmd
As
New
OleDbCommand()
conn.ConnectionString =
ConfigurationManager.ConnectionStrings(
“
AccessConn
“
).ConnectionString
cmd.Connection =
conn
conn.Open() cmd.CommandText =
SQLstr
Dim
previousConnectionState
As
ConnectionState
=
conn.State
Try
If
conn.State
=
ConnectionState.Closed
Then
conn.Open() End
If
cmd.ExecuteNonQuery() conn.Close() showph(PlaceHolder3) Catch
ex
As
Exception
l_e.Text =
“
出现错误
“
&
ex.Message
Finally
If
previousConnectionState
=
ConnectionState.Closed
Then
conn.Close() End
If
End
Try
发现无效，于是百端调试，未见其果
最后终于于偶然发现结症所在，上面代码conn.open过早，前半部分调整为
Dim
conn
As
New
OleDbConnection
Dim
cmd
As
New
OleDbCommand()
conn.ConnectionString =
ConfigurationManager.ConnectionStrings(
“
AccessConn
“
).ConnectionString
conn.Open() cmd.CommandText =
SQLstr
Dim
previousConnectionState
As
ConnectionState
=
conn.State
cmd.Connection =
conn
即可
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