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‎Powershell_script/ExcelToSqlCreateTable.ps1‎

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# PowerShell script to generate a SQL CREATE TABLE statement from an Excel file
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Write-Host "=== GENERATE CREATE TABLE FROM EXCEL ==="
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# --- XLSX File Selection ---
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$scriptDir = $PSScriptRoot
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$excelFiles = Get-ChildItem -Path $scriptDir -Filter *.xlsx
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if (-not $excelFiles -or $excelFiles.Count -eq 0) {
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Write-Error "No .xlsx file found in: $scriptDir"
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exit 1
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}
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if ($excelFiles.Count -eq 1) {
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$ExcelFile = $excelFiles[0]
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Write-Host "Excel file selected: $($ExcelFile.Name)"
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} else {
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Write-Host "Multiple .xlsx files found in the folder:"
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for ($i = 0; $i -lt $excelFiles.Count; $i++) {
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Write-Host "[$i] $($excelFiles[$i].Name)"
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}
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$fileIndex = Read-Host "Enter the number of the Excel file to use"
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if ($fileIndex -notmatch '^\d+$' -or [int]$fileIndex -lt 0 -or [int]$fileIndex -ge $excelFiles.Count) {
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Write-Error "Invalid selection. Exiting."
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exit 1
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}
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$ExcelFile = $excelFiles[$fileIndex]
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Write-Host "Excel file selected: $($ExcelFile.Name)"
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}
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# --- Sheet Name ---
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$SheetName = Read-Host "Enter the Excel sheet name (SheetName)"
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if ([string]::IsNullOrWhiteSpace($SheetName)) {
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Write-Error "SheetName not provided. Exiting script."
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exit 1
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}
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# --- SQL Table Name ---
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$SqlTableName = Read-Host "Enter the SQL table name (SqlTableName)"
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if ([string]::IsNullOrWhiteSpace($SqlTableName)) {
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Write-Error "SqlTableName not provided. Exiting script."
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exit 1
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}
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# --- Output File Name ---
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$defaultOutput = "create_table.txt"
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$outputInput = Read-Host "Enter the output file name (press Enter for default: $defaultOutput)"
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if ([string]::IsNullOrWhiteSpace($outputInput)) {
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$OutputFile = Join-Path $PSScriptRoot $defaultOutput
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} else {
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$OutputFile = Join-Path $PSScriptRoot $outputInput
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}
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# --- Type Detection Threshold ---
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$defaultThreshold = 500
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$thresholdInput = Read-Host "Enter threshold for type detection (press Enter for default: $defaultThreshold)"
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if ([string]::IsNullOrWhiteSpace($thresholdInput)) {
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$TypeThreshold = $defaultThreshold
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} else {
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if ($thresholdInput -as [int]) {
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$TypeThreshold = [int]$thresholdInput
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} else {
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Write-Error "Invalid threshold. Using default value: $defaultThreshold"
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$TypeThreshold = $defaultThreshold
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}
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}
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Write-Host "Excel file: $($ExcelFile.FullName)"
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Write-Host "Sheet: $SheetName"
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Write-Host "SQL table: $SqlTableName"
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Write-Host "Output: $OutputFile"
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# --- ImportExcel Module ---
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if (-not (Get-Module -ListAvailable -Name ImportExcel)) {
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Install-Module -Name ImportExcel -Scope CurrentUser -Force
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}
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Import-Module ImportExcel
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# --- Read Data from Sheet ---
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try {
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$data = Import-Excel -Path $ExcelFile.FullName -WorksheetName $SheetName
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} catch {
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Write-Error "Error importing XLSX file: $($_.Exception.Message)"
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exit 1
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}
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if (-not $data -or $data.Count -eq 0) {
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Write-Error "Sheet is empty or unreadable."
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exit 1
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}
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# --- Get Actual Column Names ---
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$columnNames = $data | Get-Member -MemberType NoteProperty | Select-Object -ExpandProperty Name
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# --- Handle Duplicate Headers ---
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$finalHeaders = @()
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$uniqueHeaders = @{}
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$duplicates = @()
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foreach ($c in $columnNames) {
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$colName = if ($null -eq $c -or "$c".Trim() -eq "") { "UnnamedColumn" } else { "$c".Trim() }
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$baseName = $colName
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$i = 2
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while ($finalHeaders -contains $colName) {
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if (-not ($duplicates -contains $baseName)) { $duplicates += $baseName }
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$colName = "${baseName}_$i"; $i++
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}
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$finalHeaders += $colName
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$uniqueHeaders[$finalHeaders.Count - 1] = $colName
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}
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if ($duplicates.Count -gt 0) {
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Write-Host "WARNING: Duplicate columns found and renamed: $($duplicates -join ', ')"
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} else {
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Write-Host "No duplicate columns detected."
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}
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function Get-SqlTypeAndLength($colName, $values) {
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# Clean: convert all to string, remove nulls and empty/whitespace strings
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$cleanValues = $values | Where-Object { $_ -ne $null } | ForEach-Object { "$_".Trim() }
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$nonNullValues = $cleanValues | Where-Object { $_ -match '\S' }
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if ($nonNullValues.Count -eq 0) {
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if ($colName -match '(?i)data|date') { return @{Type="DATETIME"; Length=$null} }
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else { return @{Type="NVARCHAR"; Length=100} }
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}
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$intCount = ($nonNullValues | Where-Object { $_ -match '^-?\d+$' } | Measure-Object).Count
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$floatCount = ($nonNullValues | Where-Object { $_ -match '^-?\d+\.\d+$' } | Measure-Object).Count
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$dateCount = ($nonNullValues | Where-Object {
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try { [datetime]::Parse($_) | Out-Null; $true } catch { $false }
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} | Measure-Object).Count
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$boolCount = ($nonNullValues | Where-Object {
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$t = $_.ToLower()
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$t -eq "true" -or $t -eq "false" -or $t -eq "0" -or $t -eq "1"
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} | Measure-Object).Count
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if ($intCount -ge $TypeThreshold -and $intCount -eq $nonNullValues.Count) {
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return @{Type="INT"; Length=$null}
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} elseif ($boolCount -ge $TypeThreshold -and $boolCount -eq $nonNullValues.Count) {
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return @{Type="BIT"; Length=$null}
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} elseif ($floatCount -ge $TypeThreshold -and $floatCount -eq $nonNullValues.Count) {
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return @{Type="FLOAT"; Length=$null}
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} elseif ($dateCount -ge $TypeThreshold -and $dateCount -eq $nonNullValues.Count) {
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return @{Type="DATETIME"; Length=$null}
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} else {
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# NVARCHAR: calculate max length
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$maxLen = ($nonNullValues | ForEach-Object { $_.Length } | Measure-Object -Maximum).Maximum
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$maxAllowed = 255
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$colLength = [Math]::Min($maxLen, $maxAllowed)
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return @{Type="NVARCHAR"; Length=$colLength}
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}
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}
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# --- Analyze Columns and Detect SQL Types ---
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$Columns = @()
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for ($i = 0; $i -lt $finalHeaders.Count; $i++) {
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$colName = $finalHeaders[$i]
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$propName = $columnNames[$i]
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$values = @()
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foreach ($row in $data) {
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$cellValue = $row.$propName
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$values += $cellValue
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}
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$typeInfo = Get-SqlTypeAndLength $colName $values
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$CleanCol = $colName -replace '[^a-zA-Z0-9_]', '_'
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$sqlType = if ($typeInfo.Type -eq "NVARCHAR") { "NVARCHAR($($typeInfo.Length))" } else { $typeInfo.Type }
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Write-Host "$colName -> $sqlType"
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$Columns += "[$CleanCol] $sqlType"
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}
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$ColumnsSql = $Columns -join ",`n "
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$CreateTable = "CREATE TABLE [$SqlTableName] (`n $ColumnsSql`n);"
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Set-Content -Path $OutputFile -Value $CreateTable -Encoding UTF8
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Write-Host "SQL command generated and saved to: $OutputFile"
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# --- Output Preview ---
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Write-Host "=== OUTPUT FILE CONTENT: $OutputFile ==="
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Get-Content -Path $OutputFile | Write-Host
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Write-Host "=== END OF SCRIPT ==="

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