Functions/GenXdev.Data.SQLite/Invoke-SQLiteQuery.ps1
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################################################################################ <# .SYNOPSIS Executes one or more SQL queries against a SQLite database with transaction support. .DESCRIPTION Executes SQL queries against a SQLite database with parameter support and configurable transaction isolation. Can use an external transaction for batch operations or create its own internal transaction. When using an external transaction, the caller is responsible for committing/rolling back. Connection priority: Transaction > ConnectionString > DatabaseFilePath. .PARAMETER ConnectionString The SQLite connection string for database access. Used if no Transaction is provided. .PARAMETER DatabaseFilePath The file path to the SQLite database. Will be converted to a connection string. Used if no Transaction or ConnectionString is provided. .PARAMETER Transaction An existing SQLite transaction to use. When provided, the function will not commit or rollback the transaction - that's the caller's responsibility. Takes priority over ConnectionString and DatabaseFilePath. .PARAMETER Queries One or more SQL queries to execute. Can be passed via pipeline. .PARAMETER SqlParameters Optional parameters for the queries as hashtables. Format: @{"param"="value"} .PARAMETER IsolationLevel Transaction isolation level. Defaults to ReadCommitted. Only used when creating an internal transaction. .EXAMPLE Invoke-SQLiteQuery -DatabaseFilePath "C:\data.db" -Queries "SELECT * FROM Users" .EXAMPLE "SELECT * FROM Users" | isql "C:\data.db" @{"UserId"=1} .EXAMPLE # Batch operations using external transaction $tx = Get-SQLiteTransaction -DatabaseFilePath "C:\data.db" try { Invoke-SQLiteQuery -Transaction $tx -Queries "INSERT INTO Users VALUES (@name)" -SqlParameters @{"name"="John"} Invoke-SQLiteQuery -Transaction $tx -Queries "UPDATE Users SET active=1 WHERE name=@name" -SqlParameters @{"name"="John"} $tx.Commit() } catch { $tx.Rollback() throw } finally { $tx.Connection.Close() } #> function Invoke-SQLiteQuery { [CmdletBinding()] param ( ########################################################################### [Parameter( Position = 0, Mandatory = $false, HelpMessage = 'The connection string to the SQLite database.' )] [string]$ConnectionString, ########################################################################### [Parameter( Position = 1, Mandatory = $false, HelpMessage = 'The path to the SQLite database file.' )] [ValidateNotNullOrEmpty()] [Alias("dbpath", "indexpath")] [string]$DatabaseFilePath, ########################################################################### [Parameter( Position = 2, Mandatory = $false, HelpMessage = 'An existing SQLite transaction to use for the queries.' )] [System.Data.SQLite.SQLiteTransaction]$Transaction, ########################################################################### [Alias("q", "Value", "Name", "Text", "Query")] [parameter( Mandatory, Position = 3, ValueFromRemainingArguments, ValueFromPipeline, ValueFromPipelineByPropertyName, HelpMessage = 'The query or queries to execute.' )] [string[]]$Queries, ########################################################################### [Alias("data", "parameters", "args")] [parameter( Position = 4, ValueFromRemainingArguments, ValueFromPipeline, ValueFromPipelineByPropertyName, HelpMessage = 'Query parameters as hashtables.' )] [System.Collections.Hashtable[]]$SqlParameters = @(), ########################################################################### [Parameter( Mandatory = $false, HelpMessage = 'Transaction isolation level.' )] [System.Data.IsolationLevel]$IsolationLevel = [System.Data.IsolationLevel]::ReadCommitted ) begin { # determine connection source priority: Transaction > ConnectionString > DatabaseFilePath if ($null -ne $Transaction) { $connection = $Transaction.Connection $transaction = $Transaction $isExternalTransaction = $true Microsoft.PowerShell.Utility\Write-Verbose "Using external transaction" } elseif (-not [String]::IsNullOrWhiteSpace($ConnectionString)) { $connString = $ConnectionString $isExternalTransaction = $false Microsoft.PowerShell.Utility\Write-Verbose "Will create internal transaction with connection string: $connString" } elseif (-not [String]::IsNullOrWhiteSpace($DatabaseFilePath)) { $connString = "Data Source=$((GenXdev.FileSystem\Expand-Path $DatabaseFilePath))" $isExternalTransaction = $false Microsoft.PowerShell.Utility\Write-Verbose "Will create internal transaction with database file: $DatabaseFilePath" } else { throw "You must provide either a Transaction, ConnectionString, or DatabaseFilePath parameter." } } process { try { # establish database connection and transaction if not using external if (-not $isExternalTransaction) { $connection = Microsoft.PowerShell.Utility\New-Object System.Data.SQLite.SQLiteConnection($connString) $connection.Open() # begin transaction with specified isolation $transaction = $connection.BeginTransaction($IsolationLevel) Microsoft.PowerShell.Utility\Write-Verbose "Started internal transaction with $IsolationLevel isolation" } # ensure parameters array exists $SqlParameters = if ($SqlParameters) { $SqlParameters } else { @() } try { $idx = -1 # process each query $Queries | Microsoft.PowerShell.Core\ForEach-Object { $idx++ Microsoft.PowerShell.Utility\Write-Verbose "Executing query $($idx + 1) of $($Queries.Count)" # get parameter set for current query [System.Collections.Hashtable] $data = if ($SqlParameters.Length -gt $idx) { $SqlParameters[[Math]::Min($idx, $SqlParameters.Count - 1)] } else { $null } # prepare command $command = $connection.CreateCommand() $command.CommandText = $PSItem $command.Transaction = $transaction # add parameters if provided if ($null -ne $data) { $data.GetEnumerator() | Microsoft.PowerShell.Core\ForEach-Object { $null = $command.Parameters.AddWithValue( "@" + $PSItem.Key, $PSItem.Value ) } } # execute and read results $reader = $command.ExecuteReader() while ($reader.Read()) { $record = @{} for ($i = 0; $i -lt $reader.FieldCount; $i++) { $record[$reader.GetName($i)] = $reader.GetValue($i) } Microsoft.PowerShell.Utility\Write-Output $record } $reader.Close() } # only commit if we created the transaction internally if (-not $isExternalTransaction) { $transaction.Commit() Microsoft.PowerShell.Utility\Write-Verbose "Internal transaction committed successfully" } } catch { # only rollback if we created the transaction internally if (-not $isExternalTransaction) { $transaction.Rollback() Microsoft.PowerShell.Utility\Write-Verbose "Internal transaction rolled back due to error" } throw $_ } finally { if ($null -ne $reader) { $reader.Close() } # only close connection if we created it internally if (-not $isExternalTransaction) { $connection.Close() Microsoft.PowerShell.Utility\Write-Verbose "Internal connection closed" } } } catch { throw $_ } } end { } } ################################################################################ |