如何使用PowerShell验证SQL Server实例是否正确？

Question

我们使用Invoke-sqlcmd cmdlet使用powershell执行SQL查询.

如果SQl服务器实例被指定为错误则抛出异常.

虽然我已经在try catch中捕获了错误,但它仍然在控制台中抛出异常

"Invoke-Sqlcmd:建立与SQL Server的连接时发生与网络相关或特定于实例的错误"

            try {
            $Qresult= Invoke-sqlcmd -query $SelectQuery -ServerInstance $srvInstance
            $Qresult = $Qresult| % { $_.$columnName+"`n" }
            LogWrite "$Qresult`n"
        }
        catch {
            Write-error "Error occured when executing sql $SelectQuery"
            LogWrite $Error[0]
        }

如何验证SQL Server实例是否可用并且在执行任何查询之前它是否正在运行？

Answer 1

function SQL-Ping-Instance 
{
    param (
        [parameter(Mandatory = $true)][string] $ServerInstance,
        [parameter(Mandatory = $false)][int] $TimeOut = 1
    )

    $PingResult = $false

    try
    {
        $SqlCatalog = "master"
        $SqlConnection = New-Object System.Data.SqlClient.SqlConnection
        $SqlConnection.ConnectionString = "Server = $ServerInstance; Database = $SqlCatalog; Integrated Security = True; Connection Timeout=$TimeOut"
        $SqlConnection.Open() 
        $PingResult = $SqlConnection.State -eq "Open"
    }

    catch
    {
    }

    finally
    {
        $SqlConnection.Close()
    }

    return $pingResult
}

if (SQL-Ping-Instance $srvInstance)
{
    $Qresult= Invoke-sqlcmd -query $SelectQuery -ServerInstance $srvInstance
    $Qresult = $Qresult| % { $_.$columnName+"`n" }
    LogWrite "$Qresult`n"
}
else
{
    LogWrite "Couldn't contact $srvInstance"
}