$files = Get-ChildItem -Path 'd:\www\idea-workspace\training\RuoYi-Vue' -Recurse -Filter 'pom.xml' -ErrorAction SilentlyContinue
foreach ($f in $files) {
  $m = Select-String -Path $f.FullName -Pattern 'kingbase','mysql' | Select-Object -First 20
  if ($m) {
    Write-Output ('==== ' + $f.FullName)
    $m | ForEach-Object { Write-Output ('    L' + $_.LineNumber + ': ' + $_.Line.Trim()) }
  }
}