如何在Powershell中循环Datareader并创建DataTable

Question

首先,我要感谢那些回答我以前问题的人.你们真棒!

这是我的问题:我想查询我的sql server存储过程并返回一个datareader.但是我想从中创建一个表.我将使用该表来使用新的Powershell OpenXML命令行开关加载excel.当我尝试构建DataTable时代码失败.我认为我没有正确地使用新对象"System.Object []".这是我到目前为止所得到的:

$sqlConnection = new-object System.Data.SqlClient.SqlConnection "server=localhost;database=Demo;Integrated Security=sspi"
$sqlConnection.Open()

#Create a command object
$sqlCommand = $sqlConnection.CreateCommand()
$sqlCommand.CommandText = "EXEC Demo.usp_GetTableValueParameter_Data"

#Execute the Command
$sqlReader = $sqlCommand.ExecuteReader()

#Parse the records

$sqlReader | &{ begin{$values = new-object "System.Object[]" $sqlReader["Name"], $sqlReader["Level_Desc"], $sqlReader["Level"]} process {$_.GetValues($values); $datatable.Rows.Add($values)}}

##$datatable | format-table -autosize

# Close the database connection
$sqlConnection.Close()

#STARTING OPENXML PROCESS
#----------------------------
$xlsFile = "C:\Temp\Data.xlsx"
$datatable | Export-OpenXmlSpreadSheet -OutputPath $xlsFile  -InitialRow 3

Answer 1

将Mladen的答案翻译成PowerShell非常简单:

$sqlConnection = new-object System.Data.SqlClient.SqlConnection "server=localhost;database=Demo;Integrated Security=sspi"
$sqlConnection.Open()

#Create a command object
$sqlCommand = $sqlConnection.CreateCommand()
$sqlCommand.CommandText = "EXEC Demo.usp_GetTableValueParameter_Data"

#Execute the Command
$sqlReader = $sqlCommand.ExecuteReader()

$Datatable = New-Object System.Data.DataTable
$DataTable.Load($SqlReader)

# Close the database connection
$sqlConnection.Close()

#STARTING OPENXML PROCESS
#----------------------------
$xlsFile = "C:\Temp\Data.xlsx"
$datatable | Export-OpenXmlSpreadSheet -OutputPath $xlsFile  -InitialRow 3

但是,如果您只需要一个DataTable,则不需要在命令上调用ExecuteReader,您可以创建一个DataAdapter并使用它来填充DataTable:

$sqlConnection = new-object System.Data.SqlClient.SqlConnection "server=localhost;database=Demo;Integrated Security=sspi"
$sqlConnection.Open()

#Create a command object
$sqlCommand = $sqlConnection.CreateCommand()
$sqlCommand.CommandText = "EXEC Demo.usp_GetTableValueParameter_Data"

$adapter = New-Object System.Data.SqlClient.SqlDataAdapter $sqlcommand
$dataset = New-Object System.Data.DataSet

$adapter.Fill($dataSet) | out-null

# Close the database connection
$sqlConnection.Close()

$datatable = $dataset.Tables[0]  

#STARTING OPENXML PROCESS
#----------------------------
$xlsFile = "C:\Temp\Data.xlsx"
$datatable | Export-OpenXmlSpreadSheet -OutputPath $xlsFile  -InitialRow 3

Answer 2

我不知道如何在 powershell 中执行此操作，但在 .net 中你可以这样做：

DataTable dt = new DataTable();
dt.Load(yourSqlReader);