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Dustin Higgins  
#1 Posted : Thursday, January 23, 2020 10:06:19 PM(UTC)
Dustin Higgins

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Joined: 7/1/2018(UTC)
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PowerShell Create Database Tables from XML Files

This is a work in progress.  Eventually I will write a full post on this one.  I'm just sharing some ideas right now.

This is meant to be used with Object Oriented Approach to SQL Server

function Get-TableObj
    # Create the object
    $Obj = [PSCustomObject]@{
        TableName = $null
        FieldList = New-Object System.Collections.Generic.List[PSObject]
    # Add the GetDropTableCmd Method
    $Obj | Add-Member -Name "GetDropTableCmd" -MemberType ScriptMethod -Value {
        $Sb = New-Object System.Text.StringBuilder
        # Add the Cmd
        [void]$Sb.AppendLine("DROP TABLE [$($this.TableName)]")
        $SqlCmd = Get-SqlCommand -CommandText $Sb.ToString()
        # Return the cmd
        Return $SqlCmd
    # Add the GetCreateTableCmd Method
    $Obj | Add-Member -Name "GetCreateTableCmd" -MemberType ScriptMethod -Value {
        $FieldList = New-Object System.Collections.Generic.List[string]
        foreach ($i in $this.FieldList) {
            $FieldList.Add("$($i.Field) $($i.DataType)")
        $Sb = New-Object System.Text.StringBuilder
        # Begin the CREATE TABLE Command
        [void]$Sb.AppendLine("CREATE TABLE [$($this.TableName)] ($([string]::Join(",",$FieldList)))")
        $SqlCmd = Get-SqlCommand -CommandText $Sb.ToString()
        # Return the cmd

        Return $SqlCmd     }


    return $Obj }

This code just creates the XML that eventually will be read in to build "Table" objects (IE: maintain the tables, fields, and types in an XML file):

$date = Get-Date -Format yyyy-MM-dd
$ScriptDir = Split-Path $script:MyInvocation.MyCommand.Path

# Create a list to hold the tables

$TableList = New-Object System.Collections.Generic.List[psobject]

# Create a Table Object

$Obj = Get-TableObj $Obj.TableName = "AdministratorsGroup" $Obj.FieldList.Add([PSCustomObject]@{ Field = "Computer" ; DataType = "varchar(max)"}) $Obj.FieldList.Add([PSCustomObject]@{ Field = "Domain" ; DataType = "varchar(max)"}) $Obj.FieldList.Add([PSCustomObject]@{ Field = "Name" ; DataType = "varchar(max)"}) $Obj.FieldList.Add([PSCustomObject]@{ Field = "ObjTimeStamp" ; DataType = "DateTime"}) # Add the object to the list $TableList.Add($Obj)

# Create an XML doc: [xml]$Doc = New-Object System.Xml.XmlDocument # Create and add the declaration $dec = $Doc.CreateXmlDeclaration("1.0","UTF-8",$null) [void]$doc.AppendChild($dec) # Create the root node $root = $doc.CreateNode("element","Tables",$null) # Loop through the table list foreach ($i in $TableList) {     # Create an element for the each Table     $TableNode = $doc.CreateNode("element","Table",$null)     # Set the Table Name     $TableNode.SetAttribute("Name",$($i.TableName))     # Create the Fields Node     $FieldsNode = $doc.CreateNode("element","Fields",$null)     # Loop through the fields     foreach ($j in $i.FieldList) {        # Create a field node        $FieldNode = $doc.CreateNode("element","Field",$null)        # Set the Name and DataType        $FieldNode.SetAttribute("Name",$($j.Field))        $FieldNode.SetAttribute("DataType",$($j.DataType))        [void]$FieldsNode.AppendChild($FieldNode)     }     # Add the Fields Node to the Table Node     [void]$TableNode.AppendChild($FieldsNode)     # Add the Table Node to the Root     [void]$root.AppendChild($TableNode) } # Add the Root to the doc [void]$doc.AppendChild($root) # Save the XML file $"$($ScriptDir)\DatabaseTables.xml")

Here is example XML that the above code creates.  The thought is to write code to read these XML files to create "Table" objects that have methods to "Drop" and "Create" tables.

<?xml version="1.0" encoding="UTF-8"?>
  <Table Name="AdministratorsGroup">
      <Field Name="Computer" DataType="varchar(max)" />
      <Field Name="Domain" DataType="varchar(max)" />
      <Field Name="Name" DataType="varchar(max)" />
      <Field Name="ObjTimeStamp" DataType="DateTime" />

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