internal/functions/Update-SqlDbReadOnly.ps1

function Update-SqlDbReadOnly {
    <#
    .SYNOPSIS
        Internal function. Updates specified database to read-only or read-write. Necessary because SMO doesn't appear to support NO_WAIT.
    #>

    [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseShouldProcessForStateChangingFunctions", "")]
    [CmdletBinding(SupportsShouldProcess)]
    param (
        [Parameter(Mandatory)]
        [ValidateNotNullOrEmpty()]
        [object]$SqlInstance,
        [Parameter(Mandatory)]
        [ValidateNotNullOrEmpty()]
        [string]$DbName,
        [Parameter(Mandatory)]
        [ValidateNotNullOrEmpty()]
        [bool]$readonly
    )

    if ($readonly) {
        $sql = "ALTER DATABASE [$DbName] SET READ_ONLY WITH NO_WAIT"
    } else {
        $sql = "ALTER DATABASE [$DbName] SET READ_WRITE WITH NO_WAIT"
    }

    try {
        $server = Connect-DbaInstance -SqlInstance $SqlInstance
        if ($Pscmdlet.ShouldProcess($server.Name, "Setting $DbName to readonly")) {
            if ($readonly) {
                Stop-DbaProcess -SqlInstance $SqlInstance -Database $DbName
            }
            $null = $server.Query($sql)
        }
        Write-Message -Level Verbose -Message "Changed ReadOnly status to $readonly for $DbName on $($server.name)"
        return $true
    } catch {
        Write-Message -Level Warning "Could not change readonly status for $DbName on $($server.name)"
        return $false
    }
}
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