import win32com.client
# Connect to the database
conn_string = "Provider=...." # sensitive information redacted
conn = win32com.client.Dispatch("ADODB.Connection")
conn.Open(conn_string)
# Create the temporary test table
cmd = win32com.client.Dispatch("ADODB.Command")
cmd.ActiveConnection = conn
cmd.CommandText = "CREATE TABLE #t (dt DATETIME NOT NULL)"
cmd.CommandType = 1 # adCmdText
cmd.Execute()
# Insert a row into the table (with whole second precision)
cmd = win32com.client.Dispatch("ADODB.Command")
cmd.ActiveConnection = conn
cmd.CommandText = "INSERT INTO #t VALUES (?)"
cmd.CommandType = 1 # adCmdText
params = cmd.Parameters
param = params.Item(0)
print("param type is {:d}".format(param.Type)) # 135 (adDBTimeStamp)
param.Value = "2018-01-01 12:34:56"
cmd.Execute() # this invocation succeeds
# Show the result
cmd = win32com.client.Dispatch("ADODB.Command")
cmd.ActiveConnection = conn
cmd.CommandText = "SELECT * FROM #t"
cmd.CommandType = 1 # adCmdText
rs, rowcount = cmd.Execute()
data = rs.GetRows(1)
print(data[0][0]) # displays the datetime value stored above
# Insert a second row into the table (with sub-second precision)
cmd = win32com.client.Dispatch("ADODB.Command")
cmd.ActiveConnection = conn
cmd.CommandText = "INSERT INTO #t VALUES (?)"
cmd.CommandType = 1 # adCmdText
params = cmd.Parameters
param = params.Item(0)
print("param type is {:d}".format(param.Type)) # 135 (adDBTimeStamp)
param.Value = "2018-01-01 12:34:56.003" # <- blows up here
cmd.Execute()
# Show the result
cmd = win32com.client.Dispatch("ADODB.Command")
cmd.ActiveConnection = conn
cmd.CommandText = "SELECT * FROM #t"
cmd.CommandType = 1 # adCmdText
rs, rowcount = cmd.Execute()
data = rs.GetRows(2)
print(data[0][1])
在上面指出的那一行,此代码会抛出一个异常,错误信息为“应用程序在当前操作中使用了错误类型的值。”这是ADODB中已知的一个bug吗?如果是,我还没有找到任何相关讨论。(也许早些时候有讨论,但当微软关闭KB页面时就消失了。)如果该值与文档相符,它怎么可能是错误类型的呢?