Sources/Object/Find-Object.ps1

using namespace Belin.Sql
using namespace System.Data

<#
.SYNOPSIS
    Finds either an entity with the specified primary key, or all entities.
.INPUTS
    The primary key value.
.OUTPUTS
    Either the entity with the specified primary key, or all entities.
#>

function Find-Object {
    [CmdletBinding(DefaultParameterSetName = "Id")]
    [OutputType([object])]
    param (
        # The connection to the data source.
        [Parameter(Mandatory, Position = 0)]
        [IDbConnection] $Connection,

        # The type of object to find.
        [Parameter(Mandatory, Position = 1)]
        [Type] $Class,

        # The primary key value.
        [Parameter(Mandatory, ParameterSetName = "Id", Position = 2, ValueFromPipeline)]
        [object] $Id,

        # Value indicating whether to find all entities.
        [Parameter(ParameterSetName = "All")]
        [switch] $All,

        # The hints describing the sort order of columns.
        [Parameter(ParameterSetName = "All")]
        [SqlOrderHintCollection] $OrderBy,

        # An optional command builder used to build the SQL query to be executed.
        [SqlCommandBuilder] $Builder,

        # The list of columns to select. By default, all columns.
        [ValidateNotNull()]
        [string[]] $Columns = @(),

        # The wait time, in seconds, before terminating the attempt to execute the command and generating an error.
        [ValidateRange("NonNegative")]
        [int] $Timeout = 30,

        # The transaction within which the command executes.
        [IDbTransaction] $Transaction
    )

    begin { $Builder ??= New-CommandBuilder $Connection }
    process {
        if ($All) { [DbConnectionExtensions]::FindAll($Connection, $Class, $OrderBy, $Columns, $Timeout, $Transaction, $Builder) }
        else { [DbConnectionExtensions]::Find($Connection, $Class, $Id, $Columns, $Timeout, $Transaction, $Builder) }
    }
}