🐛 fix(table-designer): 优化表设计触发器修改入口

- 修改触发器从固定弹窗改为对象编辑 SQL 标签页
- 生成删除旧触发器和创建新触发器脚本，便于执行前审查
- 抽出触发器编辑 SQL 构造工具，统一 TriggerViewer 与 TableDesigner 逻辑
- 保留新增触发器原弹窗路径，降低行为变更范围
- 新增触发器编辑入口与 SQL 构造回归测试
Refs #557

frontend/src/utils/triggerEditSql.test.ts

@@ -0,0 +1,19 @@
+import { describe, expect, it } from 'vitest';
+
+import { buildEditableTriggerSql } from './triggerEditSql';
+
+describe('triggerEditSql', () => {
+  it('builds a replace-style trigger edit script with drop and create statements', () => {
+    const sql = buildEditableTriggerSql(
+      'bit_check',
+      'CREATE TRIGGER `bit_check`\nBEFORE INSERT ON `c_check`\nFOR EACH ROW\nBEGIN\n  SET NEW.flag = 1;\nEND',
+      { dropSql: 'DROP TRIGGER IF EXISTS `bit_check`' },
+    );
+
+    expect(sql).toContain('-- 修改触发器: bit_check');
+    expect(sql).toContain('表设计修改会先删除原触发器，再创建新触发器');
+    expect(sql).toContain('DROP TRIGGER IF EXISTS `bit_check`;');
+    expect(sql).toContain('CREATE TRIGGER `bit_check`');
+    expect(sql.trim().endsWith(';')).toBe(true);
+  });
+});

frontend/src/utils/triggerEditSql.ts

@@ -0,0 +1,53 @@
+export const ensureSqlStatementTerminator = (sql: string): string => {
+  const normalized = String(sql || '').trim();
+  if (!normalized) return '';
+  return /;\s*$/.test(normalized) ? normalized : `${normalized};`;
+};
+
+const buildTriggerEditHeader = (
+  triggerName: string,
+  options?: { dropSql?: string },
+): string => {
+  const normalizedName = String(triggerName || '').trim();
+  const hint = String(options?.dropSql || '').trim()
+    ? '表设计修改会先删除原触发器，再创建新触发器，请确认后执行'
+    : '请确认语法兼容当前数据库后执行';
+  return `-- 修改触发器: ${normalizedName}\n-- ${hint}\n`;
+};
+
+const normalizeEditableTriggerDefinition = (
+  triggerName: string,
+  triggerDefinition: string,
+): string => {
+  const normalizedName = String(triggerName || '').trim();
+  const normalizedDefinition = String(triggerDefinition || '').trim();
+  if (!normalizedDefinition) {
+    return '-- 当前触发器定义为空，请补全 CREATE TRIGGER 语句后执行';
+  }
+  if (/^\s*create\s+(?:or\s+replace\s+)?trigger\b/i.test(normalizedDefinition)) {
+    return ensureSqlStatementTerminator(normalizedDefinition);
+  }
+  if (/^\s*trigger\b/i.test(normalizedDefinition)) {
+    return ensureSqlStatementTerminator(
+      normalizedDefinition.replace(/^\s*trigger\b/i, 'CREATE OR REPLACE TRIGGER'),
+    );
+  }
+  if (/^\s*(?:before|after|instead\s+of)\b/i.test(normalizedDefinition)) {
+    return ensureSqlStatementTerminator(`CREATE OR REPLACE TRIGGER ${normalizedName}\n${normalizedDefinition}`);
+  }
+  return `-- 当前数据源仅返回触发器定义片段，请补全 CREATE TRIGGER 语句后执行\n${ensureSqlStatementTerminator(normalizedDefinition)}`;
+};
+
+export const buildEditableTriggerSql = (
+  triggerName: string,
+  triggerDefinition: string,
+  options?: { dropSql?: string },
+): string => {
+  const header = buildTriggerEditHeader(triggerName, options);
+  const dropSql = String(options?.dropSql || '').trim();
+  const createSql = normalizeEditableTriggerDefinition(triggerName, triggerDefinition);
+  if (!dropSql) {
+    return `${header}${createSql}`;
+  }
+  return `${header}${ensureSqlStatementTerminator(dropSql)}\n${createSql}`;
+};