Modify action behavior to delete and regenerate the SQL file if it already exists when the action is executed.

Author: xterao

src/main/kotlin/org/domaframework/doma/intellij/common/psi/PsiDaoMethod.kt

@@ -200,6 +200,7 @@ class PsiDaoMethod(
                     PsiManager
                         .getInstance(psiProject)
                         .findDirectory(virtualFile) ?: return@runWriteCommandAction
+                sqlOutputDirPath.findFile(sqlFileName)?.delete()
                 val sqlVirtualFile = sqlOutputDirPath.createFile(sqlFileName).virtualFile ?: return@runWriteCommandAction
                 FileEditorManager
                     .getInstance(psiProject)
@@ -214,8 +215,9 @@ class PsiDaoMethod(
      */
     private fun writeEmptyElementSqlFile(sqlVirtualFile: VirtualFile) {
         val psiFile = psiProject.findFile(sqlVirtualFile) ?: return
+        val documentManager = PsiDocumentManager.getInstance(psiProject)
         val document =
-            PsiDocumentManager.getInstance(psiProject).getDocument(psiFile) ?: return
+            documentManager.getDocument(psiFile) ?: return
         WriteCommandAction.runWriteCommandAction(psiProject) {
             document.insertString(0, "-- Generated By Doma Tools")
         }