feat(structure): add copy-all-column-names to table designer

apps/desktop/src/lib/__tests__/table/tableStructureEditorState.spec.ts

@@ -26,6 +26,8 @@ import {
   resolveInsertColumnIndex,
   restoreCharacterLengthUnitsAfterSave,
   splitDataType,
+  structureColumnCommentsForCopy,
+  structureColumnNamesForCopy,
   tableStructureIdentifierComparisonKey,
 } from "@/lib/table/tableStructureEditorState";
 
@@ -703,3 +705,42 @@ describe("tableStructureEditorState", () => {
     expect(isMysqlCharacterDataType("geometry")).toBe(false);
   });
 });
+
+describe("structureColumnNamesForCopy", () => {
+  const column = (name: string, markedForDrop = false) => ({ name, markedForDrop });
+
+  it("keeps the visible field order", () => {
+    expect(structureColumnNamesForCopy([column("id"), column("name"), column("note")])).toEqual(["id", "name", "note"]);
+  });
+
+  it("drops fields marked for drop and blank names", () => {
+    expect(structureColumnNamesForCopy([column("id"), column("drop_me", true), column("  "), column(" name ")])).toEqual(["id", "name"]);
+  });
+
+  it("returns nothing for an empty table", () => {
+    expect(structureColumnNamesForCopy([])).toEqual([]);
+  });
+});
+
+describe("structureColumnCommentsForCopy", () => {
+  it("maps trimmed names to trimmed comments", () => {
+    const comments = structureColumnCommentsForCopy([
+      { name: "id", comment: " 主键 ", markedForDrop: false },
+      { name: "name", comment: "名称", markedForDrop: false },
+    ]);
+    expect([...comments]).toEqual([
+      ["id", "主键"],
+      ["name", "名称"],
+    ]);
+  });
+
+  it("skips dropped fields, blank comments and blank names", () => {
+    const comments = structureColumnCommentsForCopy([
+      { name: "gone", comment: "已删除", markedForDrop: true },
+      { name: "empty", comment: "   ", markedForDrop: false },
+      { name: "blank-name", comment: null, markedForDrop: false },
+      { name: "  ", comment: "没有字段名", markedForDrop: false },
+    ]);
+    expect(comments.size).toBe(0);
+  });
+});

apps/desktop/src/lib/table/tableStructureEditorState.ts

@@ -1,6 +1,26 @@
 import type { ColumnInfo, DatabaseConnectionInfo, DatabaseType, ForeignKeyInfo, IndexInfo, TriggerInfo } from "@/types/database.ts";
 import type { ColumnExtra, EditableStructureColumn, EditableStructureForeignKey, EditableStructureIndex, EditableStructureTrigger } from "@/lib/table/tableStructureEditorSql.ts";
 
+/**
+ * Column names offered by the structure editor's "copy all column names" action.
+ * Fields marked for drop disappear on save, so they are not offered.
+ */
+export function structureColumnNamesForCopy(columns: readonly Pick<EditableStructureColumn, "name" | "markedForDrop">[]): string[] {
+  return columns.filter((column) => !column.markedForDrop && column.name.trim()).map((column) => column.name.trim());
+}
+
+/** Comment lookup for the same action, keyed by the trimmed column name. */
+export function structureColumnCommentsForCopy(columns: readonly Pick<EditableStructureColumn, "name" | "comment" | "markedForDrop">[]): Map<string, string> {
+  const comments = new Map<string, string>();
+  for (const column of columns) {
+    if (column.markedForDrop) continue;
+    const name = column.name.trim();
+    const comment = column.comment?.trim();
+    if (name && comment) comments.set(name, comment);
+  }
+  return comments;
+}
+
 export function hasExistingColumnTypeChange(columns: readonly EditableStructureColumn[]): boolean {
   return columns.some((column) => !!column.original && !column.markedForDrop && column.dataType !== column.original.data_type);
 }