functions/Get-DbaDbCheckConstraint.ps1

function Get-DbaDbCheckConstraint {
<#
    .SYNOPSIS
        Gets database Check constraints.
         
    .DESCRIPTION
        Gets database Checks constraints.
         
    .PARAMETER SqlInstance
        The target SQL Server instance(s)
         
    .PARAMETER SqlCredential
        Allows you to login to SQL Server using alternative credentials
         
    .PARAMETER Database
        To get Checks from specific database(s)
         
    .PARAMETER ExcludeDatabase
        The database(s) to exclude - this list is auto populated from the server
         
    .PARAMETER ExcludeSystemTable
        This switch removes all system objects from the table collection
         
    .PARAMETER EnableException
        By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message.
        This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting.
        Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch.
         
    .NOTES
        Tags: Database
        Author: Cláudio Silva (@ClaudioESSilva), https://claudioessilva.eu
         
        Website: https://dbatools.io
        Copyright: (c) 2018 by dbatools, licensed under MIT
        License: MIT https://opensource.org/licenses/MIT
         
    .EXAMPLE
        PS C:\> Get-DbaDbCheckConstraint -SqlInstance sql2016
         
        Gets all database check constraints.
         
    .EXAMPLE
        PS C:\> Get-DbaDbCheckConstraint -SqlInstance Server1 -Database db1
         
        Gets the check constraints for the db1 database.
         
    .EXAMPLE
        PS C:\> Get-DbaDbCheckConstraint -SqlInstance Server1 -ExcludeDatabase db1
         
        Gets the check constraints for all databases except db1.
         
    .EXAMPLE
        PS C:\> Get-DbaDbCheckConstraint -SqlInstance Server1 -ExcludeSystemTable
         
        Gets the check constraints for all databases that are not system objects.
         
    .EXAMPLE
        PS C:\> 'Sql1','Sql2/sqlexpress' | Get-DbaDbCheckConstraint
         
        Gets the check constraints for the databases on Sql1 and Sql2/sqlexpress.
         
#>

    [CmdletBinding()]
    param (
        [parameter(Mandatory, ValueFromPipeline)]
        [Alias("ServerInstance", "SqlServer")]
        [DbaInstanceParameter[]]$SqlInstance,
        [PSCredential]$SqlCredential,
        [object[]]$Database,
        [object[]]$ExcludeDatabase,
        [switch]$ExcludeSystemTable,
        [Alias('Silent')]
        [switch]$EnableException
    )

    process {
        foreach ($instance in $SqlInstance) {
            try {
                Write-Message -Level Verbose -Message "Connecting to $instance"
                $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $sqlcredential
            }
            catch {
                Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue
            }

            $databases = $server.Databases | Where-Object IsAccessible

            if ($Database) {
                $databases = $databases | Where-Object Name -In $Database
            }
            if ($ExcludeDatabase) {
                $databases = $databases | Where-Object Name -NotIn $ExcludeDatabase
            }

            foreach ($db in $databases) {
                if (!$db.IsAccessible) {
                    Write-Message -Level Warning -Message "Database $db is not accessible. Skipping."
                    continue
                }

                foreach($tbl in $db.Tables) {
                    if ( (Test-Bound -ParameterName ExcludeSystemTable) -and $tbl.IsSystemObject ) {
                        continue
                    }

                    if ($tbl.Checks.Count -eq 0) {
                        Write-Message -Message "No Checks exist in $tbl table on the $db database on $instance" -Target $tbl -Level Verbose
                        continue
                    }

                    foreach ($ck in $tbl.Checks) {
                        Add-Member -Force -InputObject $ck -MemberType NoteProperty -Name ComputerName -value $server.ComputerName
                        Add-Member -Force -InputObject $ck -MemberType NoteProperty -Name InstanceName -value $server.ServiceName
                        Add-Member -Force -InputObject $ck -MemberType NoteProperty -Name SqlInstance -value $server.DomainInstanceName
                        Add-Member -Force -InputObject $ck -MemberType NoteProperty -Name Database -value $db.Name

                        $defaults = 'ComputerName', 'InstanceName', 'SqlInstance', 'Database', 'Parent', 'ID', 'CreateDate',
                        'DateLastModified', 'Name', 'IsEnabled', 'IsChecked', 'NotForReplication', 'Text', 'State'
                        Select-DefaultView -InputObject $ck -Property $defaults
                    }
                }
            }
        }
    }
}