sql - 从SQL存储过程中提取毫秒数据

Question

我一直在寻找有关这个问题的答案，并且已经在另一个论坛上发帖，但这似乎是所有知识的结晶。我正在尝试使用PowerShell从SQL Server 2000数据库中提取数据。 Powershell脚本调用一个存储过程，然后将其提取数据并将export-csv输出到CSV中。问题在于输出数据中的datetime字段丢失了毫秒数。当PowerShell将数据库中的数据提取到临时表中时，会发生这种情况。这是代码的两位。

PowerShell脚本

#VARIABLES
$SqlQuery = "SAP_proc"
#Connection Strings
$Server = "server"
$Database = "db_dab"
#Output Files
$OutputPath = "c:\Sapout.csv"
#END OF VARIABLES

#SQL Connection
$SqlConnection = New-Object System.Data.SqlClient.SqlConnection
$SqlConnection.ConnectionString = "Server=$Server;Database=$Database;Integrated Security=True"
$SqlCmd = New-Object System.Data.SqlClient.SqlCommand
$SqlCmd.CommandText = "SAP_proc"
$SqlCmd.Connection = $SqlConnection
$SqlAdapter = New-Object System.Data.SqlClient.SqlDataAdapter
$SqlAdapter.SelectCommand = $SqlCmd
$DataSet = New-Object System.Data.DataSet
$DataOut = $SqlAdapter.Fill($DataSet)
#$DataOut = $SqlAdapter.FillSchema($DataSet,[System.Data.SchemaType]::Source)
#Data Manipulation
$DataOut | Out-Null
#Export Data to Hash Table
$DataTable = $DataSet.Tables[0] 
#Export Has table to CSV
$DataTable | Export-CSV -Delimiter "," -Encoding Unicode -Path $OutputPath -NoTypeInformation
$SqlConnection.Close()

存储过程

ALTER proc [dbo].[SAP_proc]
as
DECLARE @return_value int
DECLARE @starttime datetime
DECLARE @endtime datetime

SET @starttime = DATEADD (dd, -30, CURRENT_TIMESTAMP)
SET @endtime = CURRENT_TIMESTAMP

EXEC    @return_value = [dbo].[sp_agent]
        @starttime
        ,@endtime 

SELECT  'Return Value' = @return_value

因为其他存储过程SP_agent是由软件创建的，所以我无法对其进行编辑。我也不想在命令文本字符串中复制软件定义的存储过程(使用SELECT将日期时间转换为varchar)，因为它是一个庞然大物的存储过程。

任何帮助都是非常有用的。

Answer 1

这不是Powershell问题或临时表问题。这是因为使用默认的tostring方法(不包含毫秒)调用export-csv时，datetime列将转换为字符串。如果需要毫秒，则在tostring方法调用中指定它:

$a = get-date
$a.ToString("d/M/yyyy hh:mm:ss.fff tt")

#To to something similar with your export-csv of a datatable you can create an expression:

$DataTable | select column1, column2, @{n=datecolumn;e={$_.datecolumn.ToString("d/M/yyyy hh:mm:ss.fff tt")}} | export-csv <rest of code>

编辑日期2012年10月17日
看来您仍然对此感到麻烦。所以这是一个完整的脚本，我已经测试了输出毫秒数。您需要将变量部分更改为您的环境。我希望这有帮助:

#VARIABLES
$SqlQuery = "select 'test' as column1, 'milliseconds' as column2, getdate() as datecolumn"
#Connection Strings
$Server = "$env:computername\sql1"
$Database = "tempdb"
#Output Files
$OutputPath = "./millisec.csv"
#END OF VARIABLES

#SQL Connection
$SqlConnection = New-Object System.Data.SqlClient.SqlConnection
$SqlConnection.ConnectionString = "Server=$Server;Database=$Database;Integrated Security=True"
$SqlCmd = New-Object System.Data.SqlClient.SqlCommand
$SqlCmd.CommandText = $SqlQuery
$SqlCmd.Connection = $SqlConnection
$SqlAdapter = New-Object System.Data.SqlClient.SqlDataAdapter
$SqlAdapter.SelectCommand = $SqlCmd
$DataSet = New-Object System.Data.DataSet
$DataOut = $SqlAdapter.Fill($DataSet)
#$DataOut = $SqlAdapter.FillSchema($DataSet,[System.Data.SchemaType]::Source)
#Data Manipulation
$DataOut | Out-Null
#Export Data to Hash Table
$DataTable = $DataSet.Tables[0] 
#Export Has table to CSV
#$DataTable | Export-CSV -Delimiter "," -Encoding Unicode -Path $OutputPath -NoTypeInformation
$DataTable | select column1, column2, @{n='datecolumn';e={$_.datecolumn.ToString("M/d/yyyy hh:mm:ss.fff tt")}} | export-csv $OutputPath -NoTypeInformation -force

$SqlConnection.Close()

＃另一个带有说明的代码示例。添加于10/23/2012

#VARIABLES
$SqlQuery = "select getdate() as datecolumn"
#Connection Strings
$Server = "$env:computername\sql1"
$Database = "tempdb"


$SqlConnection = New-Object System.Data.SqlClient.SqlConnection
$SqlConnection.ConnectionString = "Server=$Server;Database=$Database;Integrated Security=True"
$SqlConnection.Open() 
$SqlCmd = new-Object System.Data.SqlClient.SqlCommand($SqlQuery, $SqlConnection) 
$data = $SqlCmd.ExecuteScalar() 
$SqlConnection.Close()

#Notice NO millisecond
Write-Output $data

#See $data is an object of type System.DateTime
$data | gm

#There's a property called millisecond
#Millisecond          Property       int Millisecond {get;} 

#Although you don't "see" millisecond's on screen it's still there
$data.Millisecond


#Powershell uses a types and format rules to define how data is display on screen. You can see this by  looking at 
#C:\Windows\System32\WindowsPowerShell\v1.0\types.ps1xml and searching for "DataTime". This file along with format file define how data is displayed
#When you display datatime screen it's implicitly calling
#Searching for datetime in types.ps1xml you'll find this line:
#"{0} {1}" -f $this.ToLongDateString(), $this.ToLongTimeString()

#for our example

"{0} {1}" -f $data.ToLongDateString(), $data.ToLongTimeString()

#So millisecond is still there, but if you want millisecond in your output to CSV, screen or file you'll need to call a ToString method with a date format. Here's an example:
$data.ToString("M/d/yyyy hh:mm:ss.fff tt")