fix: 修复索引添加脚本的MySQL语法兼容性

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

add_site_tags_indexes.py

@@ -5,42 +5,40 @@ from app import create_app, db
 
 app = create_app()
 
+def add_index_safe(index_name, table_name, column_name):
+    """安全添加索引，如果已存在则跳过"""
+    try:
+        # 先检查索引是否存在
+        result = db.session.execute(db.text(f"""
+            SELECT COUNT(*) as cnt FROM information_schema.statistics
+            WHERE table_schema = DATABASE()
+            AND table_name = '{table_name}'
+            AND index_name = '{index_name}'
+        """)).fetchone()
+
+        if result[0] > 0:
+            print(f"⊙ {index_name} 索引已存在，跳过")
+            return
+
+        # 创建索引
+        db.session.execute(db.text(f"""
+            CREATE INDEX {index_name} ON {table_name}({column_name});
+        """))
+        db.session.commit()
+        print(f"✓ 已添加 {index_name} 索引")
+    except Exception as e:
+        db.session.rollback()
+        print(f"✗ 添加 {index_name} 失败: {e}")
+
 with app.app_context():
-    print("开始添加索引...")
+    print("开始添加索引...\n")
 
     # 为 site_tags 表添加索引
-    try:
-        db.session.execute(db.text("""
-            CREATE INDEX IF NOT EXISTS idx_site_tags_site_id ON site_tags(site_id);
-        """))
-        print("✓ 已添加 idx_site_tags_site_id 索引")
-    except Exception as e:
-        print(f"✗ 添加 idx_site_tags_site_id 失败: {e}")
-
-    try:
-        db.session.execute(db.text("""
-            CREATE INDEX IF NOT EXISTS idx_site_tags_tag_id ON site_tags(tag_id);
-        """))
-        print("✓ 已添加 idx_site_tags_tag_id 索引")
-    except Exception as e:
-        print(f"✗ 添加 idx_site_tags_tag_id 失败: {e}")
+    add_index_safe('idx_site_tags_site_id', 'site_tags', 'site_id')
+    add_index_safe('idx_site_tags_tag_id', 'site_tags', 'tag_id')
 
     # 为 sites 表添加常用查询字段索引
-    try:
-        db.session.execute(db.text("""
-            CREATE INDEX IF NOT EXISTS idx_sites_is_active ON sites(is_active);
-        """))
-        print("✓ 已添加 idx_sites_is_active 索引")
-    except Exception as e:
-        print(f"✗ 添加 idx_sites_is_active 失败: {e}")
+    add_index_safe('idx_sites_is_active', 'sites', 'is_active')
+    add_index_safe('idx_sites_view_count', 'sites', 'view_count')
 
-    try:
-        db.session.execute(db.text("""
-            CREATE INDEX IF NOT EXISTS idx_sites_view_count ON sites(view_count);
-        """))
-        print("✓ 已添加 idx_sites_view_count 索引")
-    except Exception as e:
-        print(f"✗ 添加 idx_sites_view_count 失败: {e}")
-
-    db.session.commit()
     print("\n索引添加完成！")