PSDuckDB

0.1.2

Public/Invoke-PSDuckDb.ps1

function Invoke-PSDuckDB {
    <#
    .EXAMPLE
CREATE TABLE Cities AS SELECT * FROM 'data/otherData/cities.csv';
 
PIVOT Cities
ON Year
USING sum(Population);
    #>
    [CmdletBinding()]
    [Alias('psduckdb')]
    param(
        [string]$FileName,
        [string]$Command,
        [switch]$json,
        [switch]$csv
    )
    
    if (![string]::IsNullOrEmpty($Command)) {        
        $conn = New-DuckDBConnection
        $conn.Open()
        $duckCommand = $conn.CreateCommand()
        $duckCommand.CommandText = $Command

        try {
            $reader = $duckCommand.ExecuteReader()
            Out-DuckData $reader
        }
        catch {
            Write-Host $_.Exception.Message -ForegroundColor Red
        }
        finally {
            if ($null -ne $reader) {
                $reader.Dispose()
            }
            $duckCommand.Dispose()
            $conn.Close()
        }
    }
    else {
        $ExitOn = @("exit", "quit", "bye")
        
        if ([string]::IsNullOrEmpty($FileName)) {
            $FileName = ":memory:"
        }

        Write-Host "Welcome to PSDuckDB! $(Get-Date)"
        Write-Host 'Connected to ' -NoNewline
        if ($FileName -eq ":memory:") {
            Write-Host 'an in-memory database' -ForegroundColor Red
        }
        else {
            Write-Host $FileName -ForegroundColor Red
        }
        
        try {
            $conn = New-DuckDBConnection -Path $FileName
            $conn.Open()
            $duckCommand = $conn.CreateCommand()

            while ($true) {
                $targetCommand = Read-Host "PSDuckDB"
        
                if ($targetCommand -in $ExitOn) {
                    break
                }

                try {
                    $duckCommand.CommandText = $targetCommand
                    $reader = $duckCommand.ExecuteReader()
            
                    $returnData = Out-DuckData $reader
                    if ($json) {
                        $returnData | ConvertTo-Json
                    }
                    elseif ($csv) {
                        $returnData | ConvertTo-Csv
                    } 
                    else {
                        $returnData
                    }
                }
                catch {
                    Write-Host $_.Exception.Message -ForegroundColor Red
                }
            }
        
        }
        catch {
            Write-Host $_.Exception.Message -ForegroundColor Red
        }
        finally {       
            if ($null -ne $reader) {
                $reader.Dispose()
            }
            
            if ($null -ne $duckCommand) {
                $duckCommand.Dispose()
            }
            
            if ($null -ne $conn -and $conn.State -eq 'Open') {
                $conn.Close()
            }
        }
    }
}