Working with SqlBulkCopy can sometimes be a struggle. Sure, if you happen to get the data from a table that is identical to the one you want to push to, you are in luck. If not, you need to be sure that the DataTable object is exactly like the target table in the SQL database you want to import data to. One type wrong, or one column in the wrong place, and you are out of luck… it won’t work.
This function can save you some frustration. It will connect to an already existing table and create an empty DataTable ready to fill with data! Nice, eh?
| function New-DataTableFromSqlTable{ | |
| <# | |
| .SYNOPSIS | |
| Create a new (empty) DataTable object based on a SQL Table. | |
| .DESCRIPTION | |
| Create a new (empty) DataTable object based on a SQL Table. | |
| .PARAMETER DatabaseServer | |
| The Hostname of the database server. | |
| .PARAMETER DatabaseName | |
| The name of the database | |
| .PARAMETER TableName | |
| The name of the table you wish to create as an empty DataTable object. | |
| .EXAMPLE | |
| $dataTable = New-DataTableFromSqlTable -DatabaseServer DBServer01 -DatabaseName DB01 -TableName Table01 | |
| Description | |
| ———– | |
| Will connect to DBServer01/DB01 and create a new DataTable object based on Table01 and save to $dataTable. | |
| .NOTES | |
| Name: New-DataTableFromSqlTable | |
| Author: Øyvind Kallstad | |
| Date: 18.02.2014 | |
| Version: 1.0 | |
| #> | |
| [CmdletBinding()] | |
| param( | |
| [Parameter(Mandatory = $true)] | |
| [Alias('Server')] | |
| [string]$DatabaseServer, | |
| [Parameter(Mandatory = $true)] | |
| [string]$DatabaseName, | |
| [Parameter(Mandatory = $true)] | |
| [string]$TableName | |
| ) | |
| try{ | |
| # connect to database server | |
| [Reflection.Assembly]::LoadWithPartialName('Microsoft.SqlServer.SMO') | Out-Null | |
| $dbSrv = New-Object Microsoft.SqlServer.Management.SMO.Server $DatabaseServer | |
| # get the database | |
| $db = New-Object Microsoft.SqlServer.Management.SMO.Database | |
| $db = $dbSrv.Databases[$DatabaseName] | |
| # get the table | |
| $table = New-Object Microsoft.SqlServer.Management.SMO.Table | |
| $table = $db.Tables[$TableName] | |
| # get table columns | |
| $columns = New-Object Microsoft.SqlServer.Management.SMO.Column | |
| $columns = $table.Columns | |
| # create a datatable – this will be our returned object | |
| $dt = New-Object System.Data.DataTable($TableName) | |
| # an array to hold primary keys | |
| $keys = @() | |
| # iterate through each column | |
| foreach ($column in $columns){ | |
| # convert SQL datatypes to .NET datatypes | |
| switch ($column.DataType.Name){ | |
| 'tinyint' {$dataType = 'Byte'} | |
| 'binary' {$dataType = 'Byte[]'} | |
| 'varbinary' {$dataType = 'Byte[]'} | |
| 'image' {$dataType = 'Byte[]'} | |
| 'timestamp' {$dataType = 'Byte[]'} | |
| 'bit' {$dataType = 'Boolean'} | |
| 'smallint' {$dataType = 'Int16'} | |
| 'int' {$dataType = 'Int32'} | |
| 'bigint' {$dataType = 'Int64'} | |
| 'real' {$dataType = 'Single'} | |
| 'float' {$dataType = 'Double'} | |
| 'decimal' {$dataType = 'Decimal'} | |
| 'numeric' {$dataType = 'Decimal'} | |
| 'money' {$dataType = 'Decimal'} | |
| 'smallmoney' {$dataType = 'Decimal'} | |
| 'time' {$dataType = 'TimeSpan'} | |
| 'date' {$dataType = 'DateTime'} | |
| 'datetime' {$dataType = 'DateTime'} | |
| 'datetime2' {$dataType = 'DateTime'} | |
| 'smalldatetime' {$dataType = 'DateTime'} | |
| 'xml' {$dataType = 'Xml'} | |
| 'nchar' {$dataType = 'String'} | |
| 'char' {$dataType = 'String'} | |
| 'nvarchar' {$dataType = 'String'} | |
| 'varchar' {$dataType = 'String'} | |
| 'ntext' {$dataType = 'String'} | |
| 'text' {$dataType = 'String'} | |
| DEFAULT {$dataType = 'string'} | |
| } | |
| # create a datacolumn object | |
| $dtColumn = New-Object System.Data.DataColumn ($column.Name), ($dataType) | |
| $dtColumn.AllowDBNull = $column.Nullable | |
| if ($column.Identity){ | |
| $dtColumn.AutoIncrement = $true | |
| $dtColumn.AutoIncrementSeed = $column.IdentitySeed | |
| $dtColumn.AutoIncrementStep = $column.IdentityIncrement | |
| } | |
| # collect keys | |
| if ($column.InPrimaryKey){ | |
| $keys += $dtColumn | |
| } | |
| # add the column to the datatable | |
| $dt.Columns.Add($dtColumn) | |
| } | |
| # add primary keys | |
| $dt.PrimaryKey = $keys | |
| } | |
| # catching exceptions | |
| catch{ | |
| if ($_.Exception.InnerException){ | |
| Write-Warning $_.Exception.InnerException.Message | |
| } | |
| else{ | |
| Write-Warning $_.Exception.Message | |
| } | |
| exit | |
| } | |
| # the finished datatable object | |
| Write-Output @(,($dt)) | |
| } |
