若依必须声明标量变量 "@parentId"。

-- 菜单 SQL
insert into sys_menu (menu_name, parent_id, order_num, url, menu_type, visible, perms, icon, create_by, create_time, update_by, update_time, remark)
values('全数据', '2058', '1', '/jyreports/jyreportsManage', 'C', '0', 'jyreports:jyreportsManage:view', '#', 'admin', '2018-03-01', 'ry', '2018-03-01', '全数据菜单');

-- 按钮父菜单ID
SELECT @parentId := LAST_INSERT_ID();

-- 按钮 SQL
insert into sys_menu (menu_name, parent_id, order_num, url, menu_type, visible, perms, icon, create_by, create_time, update_by, update_time, remark)
values('全数据查询', @parentId, '1',  '#',  'F', '0', 'jyreports:jyreportsManage:list',         '#', 'admin', '2018-03-01', 'ry', '2018-03-01', '');

insert into sys_menu (menu_name, parent_id, order_num, url, menu_type, visible, perms, icon, create_by, create_time, update_by, update_time, remark)
values('全数据新增', @parentId, '2',  '#',  'F', '0', 'jyreports:jyreportsManage:add',          '#', 'admin', '2018-03-01', 'ry', '2018-03-01', '');

insert into sys_menu (menu_name, parent_id, order_num, url, menu_type, visible, perms, icon, create_by, create_time, update_by, update_time, remark)
values('全数据修改', @parentId, '3',  '#',  'F', '0', 'jyreports:jyreportsManage:edit',         '#', 'admin', '2018-03-01', 'ry', '2018-03-01', '');

insert into sys_menu (menu_name, parent_id, order_num, url, menu_type, visible, perms, icon, create_by, create_time, update_by, update_time, remark)
values('全数据删除', @parentId, '4',  '#',  'F', '0', 'jyreports:jyreportsManage:remove',       '#', 'admin', '2018-03-01', 'ry', '2018-03-01', '');

insert into sys_menu (menu_name, parent_id, order_num, url, menu_type, visible, perms, icon, create_by, create_time, update_by, update_time, remark)
values('全数据导出', @parentId, '5',  '#',  'F', '0', 'jyreports:jyreportsManage:export',       '#', 'admin', '2018-03-01', 'ry', '2018-03-01', '');

解决办法

-- 菜单 SQL
insert into sys_menu (menu_name, parent_id, order_num, url, menu_type, visible, perms, icon, create_by, create_time, update_by, update_time, remark)
values('全数据', '2058', '1', '/jyreports/jyreportsManage', 'C', '0', 'jyreports:jyreportsManage:view', '#', 'admin', '2018-03-01', 'ry', '2018-03-01', '全数据菜单');

-- 按钮父菜单ID
--SELECT @parentId := LAST_INSERT_ID();
declare @parentId int;
-- 按钮父菜单ID
select parentId = @@IDENTITY;
-- 按钮 SQL
insert into sys_menu (menu_name, parent_id, order_num, url, menu_type, visible, perms, icon, create_by, create_time, update_by, update_time, remark)
values('全数据查询', @parentId, '1',  '#',  'F', '0', 'jyreports:jyreportsManage:list',         '#', 'admin', '2018-03-01', 'ry', '2018-03-01', '');

insert into sys_menu (menu_name, parent_id, order_num, url, menu_type, visible, perms, icon, create_by, create_time, update_by, update_time, remark)
values('全数据新增', @parentId, '2',  '#',  'F', '0', 'jyreports:jyreportsManage:add',          '#', 'admin', '2018-03-01', 'ry', '2018-03-01', '');

insert into sys_menu (menu_name, parent_id, order_num, url, menu_type, visible, perms, icon, create_by, create_time, update_by, update_time, remark)
values('全数据修改', @parentId, '3',  '#',  'F', '0', 'jyreports:jyreportsManage:edit',         '#', 'admin', '2018-03-01', 'ry', '2018-03-01', '');

insert into sys_menu (menu_name, parent_id, order_num, url, menu_type, visible, perms, icon, create_by, create_time, update_by, update_time, remark)
values('全数据删除', @parentId, '4',  '#',  'F', '0', 'jyreports:jyreportsManage:remove',       '#', 'admin', '2018-03-01', 'ry', '2018-03-01', '');

insert into sys_menu (menu_name, parent_id, order_num, url, menu_type, visible, perms, icon, create_by, create_time, update_by, update_time, remark)
values('全数据导出', @parentId, '5',  '#',  'F', '0', 'jyreports:jyreportsManage:export',       '#', 'admin', '2018-03-01', 'ry', '2018-03-01', '');