Data commit

Task/Simple-database/PowerShell/simple-database-1.psh

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+function db
+{
+    [CmdletBinding(DefaultParameterSetName="None")]
+    [OutputType([PSCustomObject])]
+    Param
+    (
+        [Parameter(Mandatory=$false,
+                   Position=0,
+                   ParameterSetName="Add a new entry")]
+        [string]
+        $Path = ".\SimpleDatabase.csv",
+
+        [Parameter(Mandatory=$true,
+                   ParameterSetName="Add a new entry")]
+        [string]
+        $Name,
+
+        [Parameter(Mandatory=$true,
+                   ParameterSetName="Add a new entry")]
+        [string]
+        $Category,
+
+        [Parameter(Mandatory=$true,
+                   ParameterSetName="Add a new entry")]
+        [datetime]
+        $Birthday,
+
+        [Parameter(ParameterSetName="Print the latest entry")]
+        [switch]
+        $Latest,
+
+        [Parameter(ParameterSetName="Print the latest entry for each category")]
+        [switch]
+        $LatestByCategory,
+
+        [Parameter(ParameterSetName="Print all entries sorted by a date")]
+        [switch]
+        $SortedByDate
+    )
+
+    if (-not (Test-Path -Path $Path))
+    {
+        '"Name","Category","Birthday"' | Out-File -FilePath $Path
+    }
+
+    $db = Import-Csv -Path $Path | Foreach-Object {
+        $_.Birthday = $_.Birthday -as [datetime]
+        $_
+    }
+
+    switch ($PSCmdlet.ParameterSetName)
+    {
+        "Add a new entry"
+        {
+            [PSCustomObject]@{Name=$Name; Category=$Category; Birthday=$Birthday} | Export-Csv -Path $Path -Append
+        }
+        "Print the latest entry"
+        {
+            $db[-1]
+        }
+        "Print the latest entry for each category"
+        {
+            ($db | Group-Object -Property Category).Name | ForEach-Object {($db | Where-Object -Property Category -Contains $_)[-1]}
+        }
+        "Print all entries sorted by a date"
+        {
+            $db | Sort-Object -Property Birthday
+        }
+        Default
+        {
+            $db
+        }
+    }
+}
+
+db -Name Bev   -Category friend   -Birthday 3/3/1983
+db -Name Bob   -Category family   -Birthday 7/19/1987
+db -Name Gill  -Category friend   -Birthday 12/9/1986
+db -Name Gail  -Category family   -Birthday 2/11/1986
+db -Name Vince -Category family   -Birthday 3/10/1960
+db -Name Wayne -Category coworker -Birthday 5/29/1962

Task/Simple-database/PowerShell/simple-database-2.psh

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+db

Task/Simple-database/PowerShell/simple-database-3.psh

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+db -Latest

Task/Simple-database/PowerShell/simple-database-4.psh

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+db -LatestByCategory

Task/Simple-database/PowerShell/simple-database-5.psh

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+db -SortedByDate