使用Access VBA中的ADODB Connection对象将NULL参数传递给SQL存储过程

Dim conn As Object
Dim cmd As Object
Dim param As Object
Dim nullValue As Variant

Set conn = CreateObject("ADODB.Connection")
conn.ConnectionString = "your_connection_string"
conn.Open

Set cmd = CreateObject("ADODB.Command")
cmd.ActiveConnection = conn
cmd.CommandType = 4 'adCmdStoredProc
cmd.CommandText = "your_stored_procedure_name"

' 设置存储过程的参数
Set param = cmd.CreateParameter("paramName", 8, 1, , nullValue) ' adVariant, adParamInput
cmd.Parameters.Append param

' 执行存储过程
cmd.Execute

' 关闭连接
conn.Close
Set conn = Nothing