Commands/New-SqlMigrationPlan.ps1
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<# Copyright 2023 Subatomix Research Inc. Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. #> function New-SqlMigrationPlan { <# .SYNOPSIS Computes a plan to apply migrations to target databases. #> [CmdletBinding()] param ( # Path of directory containing database source code. [Parameter(Mandatory, Position = 0)] [string] $SourcePath, # Target database specification(s). Create using New-SqlContext. [Parameter(Mandatory, Position = 1)] [PSql.SqlContext[]] $Target, # Path of directory in which to save the migration plan. The default value is ".migration-plan". [string] $PlanPath = $DefaultPlanPath ) process { # Discover migrations in source directory Write-Verbose "Discovering migrations in source directory." $SourceMigrations = @(Find-SqlMigrations $SourcePath) if ($SourceMigrations.Length -gt 0) { Write-Verbose "Discovered $($SourceMigrations.Length) source migration(s)." } else { throw "No migrations found in source directory: $SourcePath" } # Initialize plan directory Write-Verbose "Initializing plan directory." $PlanPath = New-Item $PlanPath -Type Directory -Force | ForEach-Object FullName $PlanPath | Join-Path -ChildPath * | Remove-Item -Recurse # Create subplan for each target database $Subplans = $(foreach ($T in $Target) { Write-Host "Computing plan for database '$($T.DatabaseName)' on server '$($T.ServerName)'." # Discover migrations applied to database Write-Verbose "Discovering migrations applied to database '$($T.DatabaseName)' on server '$($T.ServerName)'." $TargetMigrations = @(Get-SqlMigrationsApplied $T) Write-Verbose "Discovered $($TargetMigrations.Length) applied migration(s)." # Merge into a unified migrations table Write-Verbose "Merging migrations list." $Migrations = Merge-SqlMigrations $SourceMigrations $TargetMigrations # Add the _Begin and _End pseudo-migrations Find-SqlMigrations $SourcePath -Type Begin | ForEach-Object { $Migrations.Insert(0, $_.Name, $_) } Find-SqlMigrations $SourcePath -Type End | ForEach-Object { $Migrations.Add( $_.Name, $_) } # Validate migrations and read SQL as needed Resolve-SqlMigrations $Migrations # Make the plan $DatabaseId = "$($T.ServerName);$($T.DatabaseName)" -replace '[\\/:*?"<>|]', '_' $TargetPath = Join-Path $PlanPath $DatabaseId ConvertTo-SqlMigrationPlan $Migrations $TargetPath }) [PSCustomObject] @{ Path = $PlanPath RequiresOffline = !!($Subplans | Where-Object RequiresOffline) } } } |