\c postgres; DO $$ DECLARE view_exists BOOLEAN; BEGIN -- 检查视图是否已存在 SELECT EXISTS ( SELECT 1 FROM information_schema.views WHERE table_name = 'user_account_password_view' ) INTO view_exists; -- 创建或更新视图 CREATE OR REPLACE VIEW user_account_password_view AS SELECT u.id AS user_id, ua.account AS account, up.password AS password, u.deleted AS deleted FROM "user" u JOIN user_account ua ON u.id = ua.user_id JOIN user_password up ON u.id = up.user_id; -- 根据视图是否已存在输出不同提示 IF view_exists THEN RAISE NOTICE '视图 user_account_password_view 已更新'; ELSE RAISE NOTICE '视图 user_account_password_view 已创建'; END IF; EXCEPTION WHEN OTHERS THEN RAISE NOTICE '处理视图时发生错误: %', SQLERRM; END $$;