使用Powershell中的select SQL语句检索数据

Question

我的目标是将返回结果的值赋给变量:

$SqlConnection = New-Object System.Data.SqlClient.SqlConnection
$SqlConnection.ConnectionString = "Server=HOME\SQLEXPRESS;Database=master;Integrated Security=True"
$SqlCmd = New-Object System.Data.SqlClient.SqlCommand
$SqlCmd.CommandText = "select name from sysdatabases where name = 'tempdb'"
$SqlCmd.Connection = $SqlConnection
$SqlAdapter = New-Object System.Data.SqlClient.SqlDataAdapter
$SqlAdapter.SelectCommand = $SqlCmd
$DataSet = New-Object System.Data.DataSet
$SqlAdapter.Fill($DataSet)
$SqlConnection.Close()
$DataSet.Tables[0]

返回的值显然应该是'tempdb',所以如何将它赋给变量,这样才能工作:

Write-output "Database is " $variablename

期望的输出:数据库是tempdb

Answer 1

$SqlConnection = New-Object System.Data.SqlClient.SqlConnection
$SqlConnection.ConnectionString = "Server=HOME\SQLEXPRESS;Database=master;Integrated Security=True"
$SqlConnection.Open()
$SqlCmd = New-Object System.Data.SqlClient.SqlCommand
$SqlCmd.CommandText = "select name from sysdatabases where name = 'tempdb'"
$SqlCmd.Connection = $SqlConnection
$dbname = $SqlCmd.ExecuteScalar()
$SqlConnection.Close()
Write-output "Database is " $dbname

Answer 2

如果您使用的是SQL Server 2008,则应考虑使用PowerShell可用的cmdlet,例如Invoke-SqlCmd可用于对SQL Server数据库执行查询的cmdlet .我在项目中使用了这些来自动化将补丁应用到数据库并记录已应用的补丁的过程:

首先,您需要使用这两个命令使SQL Server cmdlet可用于您的会话.

add-pssnapin sqlserverprovidersnapin100
add-pssnapin sqlservercmdletsnapin100

一旦它们可用,您可以按如下方式调用SQL命令.

$x = invoke-sqlcmd -query "select name from sysdatabases where name = 'tempdb'"

该变量$x将保存运行查询的结果.

有关使用SQL Server cmdlet的更多详细信息,请查看http://msdn.microsoft.com/en-us/library/cc281720.aspx