QTP中连接MySQL，编辑vbs脚本如下：
Dim Conn
Set Conn=CreateObject("ADODB.Connection")
'Const ConnectionString="DSN=test;DATABASE=chen;PWD=root;PORT=3306;SERVER=localhost;UID=root"
Const ConnectionString="Driver={Mysql ODBC 5.1 Driver};DATABASE=chen;PWD=111111;PORT=3306;SERVER=localhost;UID=root"
Conn.Open ConnectionString
If Conn.State<>0 Then
Reporter.ReportEvent micPass,"testing","连接数据库成功"
else
Reporter.ReportEvent micFail,"testing","连接数据库失败"
End If
一直报错：[Microsoft][ODBC 驱动程序管理器] 未发现数据源名称并且未指定默认驱动程序
Line (5): "Conn.Open ConnectionString". 。请问这个是什么原因？