sql-server - 如何使用powershell验证SQL server实例是否正确？

Question

我们使用 Invoke-sqlcmd cmdlet 通过 powershell 执行 SQL 查询。

如果 SQl 服务器实例被指定为错误，则会抛出异常。

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 : A network-related or instance-specific error occurred while establishing a connection to SQL Server"

            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]
        }

如何在执行任何查询之前验证 SQL Server 实例是否可用并且正在运行？

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"
}