functions/Import-DbaCsv.ps1
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function Import-DbaCsv { <# .SYNOPSIS Efficiently imports very large (and small) CSV files into SQL Server. .DESCRIPTION Import-DbaCsv takes advantage of .NET's super fast SqlBulkCopy class to import CSV files into SQL Server. The entire import is performed within a transaction, so if a failure occurs or the script is aborted, no changes will persist. If the table or view specified does not exist and -AutoCreateTable, it will be automatically created using slow and inefficient but accommodating data types. This importer supports fields spanning multiple lines. The only restriction is that they must be quoted, otherwise it would not be possible to distinguish between malformed data and multi-line values. .PARAMETER Path Specifies path to the CSV file(s) to be imported. Multiple files may be imported at once. .PARAMETER NoHeaderRow By default, the first row is used to determine column names for the data being imported. Use this switch if the first row contains data and not column names. .PARAMETER Delimiter Specifies the delimiter used in the imported file(s). If no delimiter is specified, comma is assumed. Valid delimiters are '`t`, '|', ';',' ' and ',' (tab, pipe, semicolon, space, and comma). .PARAMETER SingleColumn Specifies that the file contains a single column of data. Otherwise, the delimiter check bombs. .PARAMETER SqlInstance The SQL Server Instance to import data into. .PARAMETER SqlCredential Login to the target instance using alternative credentials. Windows and SQL Authentication supported. Accepts credential objects (Get-Credential) .PARAMETER Database Specifies the name of the database the CSV will be imported into. Options for this this parameter are auto-populated from the server. .PARAMETER Schema Specifies the schema in which the SQL table or view where CSV will be imported into resides. Default is dbo If a schema name is not specified, and a CSV name with multiple dots is specified (ie; something.data.csv) then this will be interpreted as a request to import into a table [data] in the schema [something]. If a schema does not currently exist, it will be created, after a prompt to confirm this. Authorization will be set to dbo by default .PARAMETER Table Specifies the SQL table or view where CSV will be imported into. If a table name is not specified, the table name will be automatically determined from the filename. If the table specified does not exist and -AutoCreateTable, it will be automatically created using slow and inefficient but accommodating data types. If the automatically generated table datatypes do not work for you, please create the table prior to import. If you want to import specific columns from a CSV, create a view with corresponding columns. .PARAMETER Column Import only specific columns. To remap column names, use the ColumnMap. .PARAMETER ColumnMap By default, the bulk copy tries to automap columns. When it doesn't work as desired, this parameter will help. Check out the examples for more information. .PARAMETER AutoCreateTable Creates a table if it does not already exist. The table will be created with sub-optimal data types such as nvarchar(max) .PARAMETER Truncate If this switch is enabled, the destination table will be truncated prior to import. .PARAMETER NotifyAfter Specifies the import row count interval for reporting progress. A notification will be shown after each group of this many rows has been imported. .PARAMETER BatchSize Specifies the batch size for the import. Defaults to 50000. .PARAMETER TableLock If this switch is enabled, the SqlBulkCopy option to acquire a table lock will be used. This is automatically used if -Turbo is enabled. Per Microsoft "Obtain a bulk update lock for the duration of the bulk copy operation. When not specified, row locks are used." .PARAMETER CheckConstraints If this switch is enabled, the SqlBulkCopy option to check constraints will be used. Per Microsoft "Check constraints while data is being inserted. By default, constraints are not checked." .PARAMETER FireTriggers If this switch is enabled, the SqlBulkCopy option to allow insert triggers to be executed will be used. Per Microsoft "When specified, cause the server to fire the insert triggers for the rows being inserted into the database." .PARAMETER KeepIdentity If this switch is enabled, the SqlBulkCopy option to keep identity values from the source will be used. Per Microsoft "Preserve source identity values. When not specified, identity values are assigned by the destination." .PARAMETER KeepNulls If this switch is enabled, the SqlBulkCopy option to keep NULL values in the table will be used. Per Microsoft "Preserve null values in the destination table regardless of the settings for default values. When not specified, null values are replaced by default values where applicable." .PARAMETER NoProgress The progress bar is pretty but can slow down imports. Use this parameter to quietly import. .PARAMETER Quote Defines the default quote character wrapping every field. .PARAMETER Escape Defines the default escape character letting insert quotation characters inside a quoted field. The escape character can be the same as the quote character. .PARAMETER Comment Defines the default comment character indicating that a line is commented out. Default is #. .PARAMETER TrimmingOption Determines which values should be trimmed. Default is "None". Options are All, None, UnquotedOnly and QuotedOnly. .PARAMETER BufferSize Defines the default buffer size. The default BufferSize is 4096. .PARAMETER ParseErrorAction By default, the parse error action throws an exception and ends the import. You can also choose AdvanceToNextLine which basically ignores parse errors. .PARAMETER Encoding The encoding of the file. .PARAMETER NullValue The value which denotes a DbNull-value. .PARAMETER Threshold Defines the default value for Threshold indicating when the CsvReader should replace/remove consecutive null bytes. .PARAMETER MaxQuotedFieldLength The axmimum length (in bytes) for any quoted field. .PARAMETER SkipEmptyLine Skip empty lines. .PARAMETER SupportsMultiline Indicates if the importer should support multiline fields. .PARAMETER UseColumnDefault Use the column default values if the field is not in the record. .PARAMETER NoTransaction Do not use a transaction when performing the import. .PARAMETER WhatIf Shows what would happen if the command were to run. No actions are actually performed. .PARAMETER Confirm Prompts you for confirmation before executing any changing operations within the command. .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: Migration, Import Author: Chrissy LeMaire (@cl), netnerds.net Website: https://dbatools.io Copyright: (c) 2018 by dbatools, licensed under MIT License: MIT https://opensource.org/licenses/MIT .LINK https://dbatools.io/Import-DbaCsv .EXAMPLE PS C:\> Import-DbaCsv -Path C:\temp\housing.csv -SqlInstance sql001 -Database markets Imports the entire comma-delimited housing.csv to the SQL "markets" database on a SQL Server named sql001, using the first row as column names. Since a table name was not specified, the table name is automatically determined from filename as "housing". .EXAMPLE PS C:\> Import-DbaCsv -Path .\housing.csv -SqlInstance sql001 -Database markets -Table housing -Delimiter "`t" -NoHeaderRow Imports the entire comma-delimited housing.csv, including the first row which is not used for colum names, to the SQL markets database, into the housing table, on a SQL Server named sql001. .EXAMPLE PS C:\> Import-DbaCsv -Path C:\temp\huge.txt -SqlInstance sqlcluster -Database locations -Table latitudes -Delimiter "|" Imports the entire pipe-delimited huge.txt to the locations database, into the latitudes table on a SQL Server named sqlcluster. .EXAMPLE PS C:\> Import-DbaCsv -Path c:\temp\SingleColumn.csv -SqlInstance sql001 -Database markets -Table TempTable -SingleColumn Imports the single column CSV into TempTable .EXAMPLE PS C:\> Get-ChildItem -Path \\FileServer\csvs | Import-DbaCsv -SqlInstance sql001, sql002 -Database tempdb -AutoCreateTable Imports every CSV in the \\FileServer\csvs path into both sql001 and sql002's tempdb database. Each CSV will be imported into an automatically determined table name. .EXAMPLE PS C:\> Get-ChildItem -Path \\FileServer\csvs | Import-DbaCsv -SqlInstance sql001, sql002 -Database tempdb -AutoCreateTable -WhatIf Shows what would happen if the command were to be executed .EXAMPLE PS C:\> Import-DbaCsv -Path c:\temp\dataset.csv -SqlInstance sql2016 -Database tempdb -Column Name, Address, Mobile Import only Name, Address and Mobile even if other columns exist. All other columns are ignored and therefore null or default values. .EXAMPLE PS C:\> $columns = @{ >> Text = 'FirstName' >> Number = 'PhoneNumber' >> } PS C:\> Import-DbaCsv -Path c:\temp\supersmall.csv -SqlInstance sql2016 -Database tempdb -ColumnMap $columns The CSV column 'Text' is inserted into SQL column 'FirstName' and CSV column Number is inserted into the SQL Column 'PhoneNumber'. All other columns are ignored and therefore null or default values. #> [CmdletBinding(SupportsShouldProcess, ConfirmImpact = 'Low')] [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseDeclaredVarsMoreThanAssignments", "line", Justification = "Variable line is used, False Positive on line 330")] param ( [parameter(ValueFromPipeline)] [ValidateNotNullOrEmpty()] [Alias("Csv", "FullPath")] [object[]]$Path, [Parameter(Mandatory)] [DbaInstanceParameter[]]$SqlInstance, [pscredential]$SqlCredential, [Parameter(Mandatory)] [string]$Database, [string]$Table, [string]$Schema = "dbo", [switch]$Truncate, [char]$Delimiter = ",", [switch]$SingleColumn, [int]$BatchSize = 50000, [int]$NotifyAfter = 50000, [switch]$TableLock, [switch]$CheckConstraints, [switch]$FireTriggers, [switch]$KeepIdentity, [switch]$KeepNulls, [string[]]$Column, [hashtable[]]$ColumnMap, [switch]$AutoCreateTable, [switch]$NoProgress, [switch]$NoHeaderRow, [char]$Quote = '"', [char]$Escape = '"', [char]$Comment = '#', [ValidateSet('All', 'None', 'UnquotedOnly', 'QuotedOnly')] [string]$TrimmingOption = "None", [int]$BufferSize = 4096, [ValidateSet('AdvanceToNextLine', 'ThrowException')] [string]$ParseErrorAction = 'ThrowException', [System.Text.Encoding]$Encoding, [string]$NullValue, [int]$Threshold = 60, [int]$MaxQuotedFieldLength, [switch]$SkipEmptyLine, [switch]$SupportsMultiline, [switch]$UseColumnDefault, [switch]$NoTransaction, [switch]$EnableException ) begin { $FirstRowHeader = $NoHeaderRow -eq $false $scriptelapsed = [System.Diagnostics.Stopwatch]::StartNew() try { # SilentContinue isn't enough Add-Type -Path "$script:PSModuleRoot\bin\csv\LumenWorks.Framework.IO.dll" -ErrorAction Stop } catch { $null = 1 } function New-SqlTable { <# .SYNOPSIS Creates new Table using existing SqlCommand. SQL datatypes based on best guess of column data within the -ColumnText parameter. Columns parameter determine column names. .EXAMPLE New-SqlTable -Path $Path -Delimiter $Delimiter -Columns $columns -ColumnText $columntext -SqlConn $sqlconn -Transaction $transaction .OUTPUTS Creates new table #> [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseShouldProcessForStateChangingFunctions", "")] param ( [Parameter(Mandatory)] [string]$Path, [Parameter(Mandatory)] [string]$Delimiter, [Parameter(Mandatory)] [bool]$FirstRowHeader, [System.Data.SqlClient.SqlConnection]$sqlconn, [System.Data.SqlClient.SqlTransaction]$transaction ) $reader = New-Object LumenWorks.Framework.IO.Csv.CsvReader( (New-Object System.IO.StreamReader($Path)), $FirstRowHeader, $Delimiter, $Quote, $Escape, $Comment, [LumenWorks.Framework.IO.Csv.ValueTrimmingOptions]::$TrimmingOption, $BufferSize, $NullValue ) $columns = $reader.GetFieldHeaders() $reader.Close() $reader.Dispose() # Get SQL datatypes by best guess on first data row $sqldatatypes = @(); $index = 0 foreach ($column in $Columns) { $sqldatatypes += "[$column] varchar(MAX)" } $sql = "BEGIN CREATE TABLE [$schema].[$table] ($($sqldatatypes -join ' NULL,')) END" $sqlcmd = New-Object System.Data.SqlClient.SqlCommand($sql, $sqlconn, $transaction) try { $null = $sqlcmd.ExecuteNonQuery() } catch { $errormessage = $_.Exception.Message.ToString() Stop-Function -Continue -Message "Failed to execute $sql. `nDid you specify the proper delimiter? `n$errormessage" } Write-Message -Level Verbose -Message "Successfully created table $schema.$table with the following column definitions:`n $($sqldatatypes -join "`n ")" # Write-Message -Level Warning -Message "All columns are created using a best guess, and use their maximum datatype." Write-Message -Level Verbose -Message "This is inefficient but allows the script to import without issues." Write-Message -Level Verbose -Message "Consider creating the table first using best practices if the data will be used in production." } Write-Message -Level Verbose -Message "Started at $(Get-Date)" # Getting the total rows copied is a challenge. Use SqlBulkCopyExtension. # http://stackoverflow.com/questions/1188384/sqlbulkcopy-row-count-when-complete $sourcecode = 'namespace System.Data.SqlClient { using Reflection; public static class SqlBulkCopyExtension { const String _rowsCopiedFieldName = "_rowsCopied"; static FieldInfo _rowsCopiedField = null; public static int RowsCopiedCount(this SqlBulkCopy bulkCopy) { if (_rowsCopiedField == null) _rowsCopiedField = typeof(SqlBulkCopy).GetField(_rowsCopiedFieldName, BindingFlags.NonPublic | BindingFlags.GetField | BindingFlags.Instance); return (int)_rowsCopiedField.GetValue(bulkCopy); } } } ' if (-not $script:core) { try { Add-Type -ReferencedAssemblies System.Data.dll -TypeDefinition $sourcecode -ErrorAction Stop } catch { $null = 1 } } } process { foreach ($filename in $Path) { if ($filename.FullName) { $filename = $filename.FullName } if (-not (Test-Path -Path $filename)) { Stop-Function -Continue -Message "$filename cannot be found" } $file = (Resolve-Path -Path $filename).ProviderPath # Does the second line contain the specified delimiter? try { $firstline = Get-Content -Path $file -TotalCount 2 -ErrorAction Stop } catch { Stop-Function -Continue -Message "Failure reading $file" -ErrorRecord $_ } if (-not $SingleColumn) { if ($firstline -notmatch $Delimiter) { Stop-Function -Message "Delimiter ($Delimiter) not found in first few rows of $file. If this is a single column import, please specify -SingleColumn" return } } # Automatically generate Table name if not specified, then prompt user to confirm if (-not (Test-Bound -ParameterName Table)) { $table = [IO.Path]::GetFileNameWithoutExtension($file) Write-Message -Level Verbose -Message "Table name not specified, using $table" } foreach ($instance in $SqlInstance) { $elapsed = [System.Diagnostics.Stopwatch]::StartNew() # Open Connection to SQL Server try { $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $sqlcredential -StatementTimeout 0 -MinimumVersion 9 $sqlconn = $server.ConnectionContext.SqlConnectionObject $sqlconn.Open() } catch { Stop-Function -Message "Error occured while establishing connection to $instance" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue } if (-not $NoTransaction) { if ($PSCmdlet.ShouldProcess($instance, "Starting transaction in $Database")) { # Everything will be contained within 1 transaction, even creating a new table if required # and truncating the table, if specified. $transaction = $sqlconn.BeginTransaction() } } # Ensure database exists $sql = "select count(*) from master.dbo.sysdatabases where name = '$Database'" $sqlcmd = New-Object System.Data.SqlClient.SqlCommand($sql, $sqlconn, $transaction) if (($sqlcmd.ExecuteScalar()) -eq 0) { Stop-Function -Continue -Message "Database does not exist on $instance" } Write-Message -Level Verbose -Message "Database exists" $sqlconn.ChangeDatabase($Database) # Ensure Schema exists $sql = "select count(*) from $Database.sys.schemas where name='$schema'" $sqlcmd = New-Object System.Data.SqlClient.SqlCommand($sql, $sqlconn, $transaction) # If Schema doesn't exist create it # Defaulting to dbo. if (($sqlcmd.ExecuteScalar()) -eq 0) { if (-not $AutoCreateTable) { Stop-Function -Continue -Message "Schema $Schema does not exist and AutoCreateTable was not specified" } $sql = "CREATE SCHEMA [$schema] AUTHORIZATION dbo" if ($PSCmdlet.ShouldProcess($instance, "Creating schema $schema")) { $sqlcmd = New-Object System.Data.SqlClient.SqlCommand($sql, $sqlconn, $transaction) try { $null = $sqlcmd.ExecuteNonQuery() } catch { Stop-Function -Continue -Message "Could not create $schema" -ErrorRecord $_ } } } # Ensure table or view exists $sql = "select count(*) from $Database.sys.tables where name = '$table' and schema_id=schema_id('$schema')" $sqlcmd = New-Object System.Data.SqlClient.SqlCommand($sql, $sqlconn, $transaction) $sql2 = "select count(*) from $Database.sys.views where name = '$table' and schema_id=schema_id('$schema')" $sqlcmd2 = New-Object System.Data.SqlClient.SqlCommand($sql2, $sqlconn, $transaction) # Create the table if required. Remember, this will occur within a transaction, so if the script fails, the # new table will no longer exist. if (($sqlcmd.ExecuteScalar()) -eq 0 -and ($sqlcmd2.ExecuteScalar()) -eq 0) { if (-not $AutoCreateTable) { Stop-Function -Continue -Message "Table or view $table does not exist and AutoCreateTable was not specified" } Write-Message -Level Verbose -Message "Table does not exist" if ($PSCmdlet.ShouldProcess($instance, "Creating table $table")) { try { New-SqlTable -Path $file -Delimiter $Delimiter -FirstRowHeader $FirstRowHeader -SqlConn $sqlconn -Transaction $transaction } catch { Stop-Function -Continue -Message "Failure" -ErrorRecord $_ } } } else { Write-Message -Level Verbose -Message "Table exists" } # Truncate if specified. Remember, this will occur within a transaction, so if the script fails, the # truncate will not be committed. if ($Truncate) { $sql = "TRUNCATE TABLE [$schema].[$table]" if ($PSCmdlet.ShouldProcess($instance, "Performing TRUNCATE TABLE [$schema].[$table] on $Database")) { $sqlcmd = New-Object System.Data.SqlClient.SqlCommand($sql, $sqlconn, $transaction) try { $null = $sqlcmd.ExecuteNonQuery() } catch { Stop-Function -Continue -Message "Could not truncate $schema.$table" -ErrorRecord $_ } } } # Setup bulk copy Write-Message -Level Verbose -Message "Starting bulk copy for $(Split-Path $file -Leaf)" # Setup bulk copy options [int]$bulkCopyOptions = ([System.Data.SqlClient.SqlBulkCopyOptions]::Default) $options = "TableLock", "CheckConstraints", "FireTriggers", "KeepIdentity", "KeepNulls" foreach ($option in $options) { $optionValue = Get-Variable $option -ValueOnly -ErrorAction SilentlyContinue if ($optionValue -eq $true) { $bulkCopyOptions = $bulkCopyOptions -bor (Invoke-Expression "[System.Data.SqlClient.SqlBulkCopyOptions]::$option") } } if ($PSCmdlet.ShouldProcess($instance, "Performing import from $file")) { try { # Create SqlBulkCopy using default options, or options specified in command line. if ($bulkCopyOptions) { $bulkcopy = New-Object Data.SqlClient.SqlBulkCopy($sqlconn, $bulkCopyOptions, $transaction) } else { $bulkcopy = New-Object Data.SqlClient.SqlBulkCopy($sqlconn, ([System.Data.SqlClient.SqlBulkCopyOptions]::Default), $transaction) } $bulkcopy.DestinationTableName = "[$schema].[$table]" $bulkcopy.BulkCopyTimeout = 0 $bulkCopy.BatchSize = $BatchSize $bulkCopy.NotifyAfter = $NotifyAfter $bulkCopy.EnableStreaming = $true if ($ColumnMap) { foreach ($columnname in $ColumnMap) { foreach ($key in $columnname.Keys) { $null = $bulkcopy.ColumnMappings.Add($key, $columnname[$key]) } } } if ($Column) { foreach ($columnname in $Column) { $null = $bulkcopy.ColumnMappings.Add($columnname, $columnname) } } } catch { Stop-Function -Continue -Message "Failure" -ErrorRecord $_ } # Write to server :D try { $reader = New-Object LumenWorks.Framework.IO.Csv.CsvReader( (New-Object System.IO.StreamReader($file)), $FirstRowHeader, $Delimiter, $Quote, $Escape, $Comment, [LumenWorks.Framework.IO.Csv.ValueTrimmingOptions]::$TrimmingOption, $BufferSize, $NullValue ) if (Test-Bound -ParameterName Encoding) { $reader.Encoding = $Encoding } if (Test-Bound -ParameterName Threshold) { $reader.Threshold = $Threshold } if (Test-Bound -ParameterName MaxQuotedFieldLength) { $reader.MaxQuotedFieldLength = $MaxQuotedFieldLength } if (Test-Bound -ParameterName SkipEmptyLine) { $reader.SkipEmptyLines = $SkipEmptyLine } if (Test-Bound -ParameterName SupportsMultiline) { $reader.SupportsMultiline = $SupportsMultiline } if (Test-Bound -ParameterName UseColumnDefault) { $reader.UseColumnDefaults = $UseColumnDefault } if (Test-Bound -ParameterName ParseErrorAction) { $reader.DefaultParseErrorAction = $ParseErrorAction } # Add rowcount output $bulkCopy.Add_SqlRowsCopied( { $script:totalrows = $args[1].RowsCopied if (-not $NoProgress) { $timetaken = [math]::Round($elapsed.Elapsed.TotalSeconds, 2) Write-ProgressHelper -StepNumber 1 -TotalSteps 2 -Activity "Importing from $file" -Message ([System.String]::Format("Progress: {0} rows in {2} seconds", $script:totalrows, $percent, $timetaken)) -ExcludePercent } }) $bulkCopy.WriteToServer($reader) if ($resultcount -is [int]) { Write-Progress -id 1 -activity "Inserting $resultcount rows" -status "Complete" -Completed } $reader.Close() $reader.Dispose() $completed = $true } catch { $completed = $false if ($resultcount -is [int]) { Write-Progress -id 1 -activity "Inserting $resultcount rows" -status "Failed" -Completed } Stop-Function -Continue -Message "Failure" -ErrorRecord $_ } } if ($PSCmdlet.ShouldProcess($instance, "Finalizing import")) { if ($completed) { # "Note: This count does not take into consideration the number of rows actually inserted when Ignore Duplicates is set to ON." if (-not $NoTransaction) { $null = $transaction.Commit() } if ($script:core) { $rowscopied = "Unsupported in Core" $rps = $null } else { $rowscopied = [System.Data.SqlClient.SqlBulkCopyExtension]::RowsCopiedCount($bulkcopy) $rps = [int]($rowscopied / $elapsed.Elapsed.TotalSeconds) } Write-Message -Level Verbose -Message "$rowscopied total rows copied" [pscustomobject]@{ ComputerName = $server.ComputerName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Database = $Database Table = $table Schema = $schema RowsCopied = $rowscopied Elapsed = [prettytimespan]$elapsed.Elapsed RowsPerSecond = $rps Path = $file } } else { Stop-Function -Message "Transaction rolled back. Was the proper delimiter specified? Is the first row the column name?" -ErrorRecord $_ return } } # Close everything just in case & ignore errors try { $null = $sqlconn.close(); $null = $sqlconn.Dispose(); $null = $bulkCopy.close(); $bulkcopy.dispose(); $null = $reader.close(); $null = $reader.dispose() } catch { #here to avoid an empty catch $null = 1 } } } } end { # Close everything just in case & ignore errors try { $null = $sqlconn.close(); $null = $sqlconn.Dispose(); $null = $bulkCopy.close(); $bulkcopy.dispose(); $null = $reader.close(); $null = $reader.dispose() } catch { #here to avoid an empty catch $null = 1 } # Script is finished. Show elapsed time. $totaltime = [math]::Round($scriptelapsed.Elapsed.TotalSeconds, 2) Write-Message -Level Verbose -Message "Total Elapsed Time for everything: $totaltime seconds" Test-DbaDeprecation -DeprecatedOn "1.0.0" -Alias Import-DbaCsvtoSql Test-DbaDeprecation -DeprecatedOn "1.0.0" -EnableException:$false -Alias Import-CsvToSql } } |