1.在菜单管理中，新增需要创建的菜单，如图

并添加查询、新增、修改、删除等按钮和对应的权限和路径

例如如果没有添加查询按钮，那么在修改的时候，会存在报错：没有权限。上图对应后台代码

2.domain中创建设计的表结构及操作，如

package com.ruoyi.project.system.domain;

import com.ruoyi.framework.web.domain.BaseEntity;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;

import javax.validation.constraints.Email;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import java.util.ArrayList;
import java.util.List;

/**
 * 场景表 sys_scene
 * 
 * @author cxm
 */
public class SysScene extends BaseEntity
{
    private static final long serialVersionUID = 1L;

    /** 场景ID */
    private Long sceneId;

    /** 父场景ID */
    private Long parentId;

    /** 父场景ID */
    private Long userId;

    /** 祖级列表 */
    private String ancestors;

    /** 场景名称 */
    private String sceneName;

    /** 显示顺序 */
    private Integer orderNum;

    /** 场景状态:0正常,1停用 */
    private String status;

    /** 删除标志（0代表存在 2代表删除） */
    private String delFlag;

    /** 父场景名称 */
    private String parentName;
    
    /** 子场景 */
    private List<SysScene> children = new ArrayList<SysScene>();

    public Long getSceneId()
    {
        return sceneId;
    }

    public void setSceneId(Long sceneId)
    {
        this.sceneId = sceneId;
    }

    public Long getParentId()
    {
        return parentId;
    }
    public Long getUserId()
    {
        return userId;
    }

    public void setParentId(Long parentId)
    {
        this.parentId = parentId;
    }

    public void setUserId(Long userId)
    {
        this.userId = userId;
    }

    public String getAncestors()
    {
        return ancestors;
    }

    public void setAncestors(String ancestors)
    {
        this.ancestors = ancestors;
    }

    @NotBlank(message = "场景名称不能为空")
    @Size(min = 0, max = 30, message = "场景名称长度不能超过30个字符")
    public String getSceneName()
    {
        return sceneName;
    }

    public void setSceneName(String sceneName)
    {
        this.sceneName = sceneName;
    }

    @NotNull(message = "显示顺序不能为空")
    public Integer getOrderNum()
    {
        return orderNum;
    }

    public void setOrderNum(Integer orderNum)
    {
        this.orderNum = orderNum;
    }

    public String getStatus()
    {
        return status;
    }

    public void setStatus(String status)
    {
        this.status = status;
    }

    public String getDelFlag()
    {
        return delFlag;
    }

    public void setDelFlag(String delFlag)
    {
        this.delFlag = delFlag;
    }

    public String getParentName()
    {
        return parentName;
    }

    public void setParentName(String parentName)
    {
        this.parentName = parentName;
    }

    public List<SysScene> getChildren()
    {
        return children;
    }

    public void setChildren(List<SysScene> children)
    {
        this.children = children;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this,ToStringStyle.MULTI_LINE_STYLE)
            .append("sceneId", getSceneId())
            .append("parentId", getParentId())
            .append("userId", getUserId())
            .append("ancestors", getAncestors())
            .append("sceneName", getSceneName())
            .append("orderNum", getOrderNum())
            .append("status", getStatus())
            .append("delFlag", getDelFlag())
            .append("createBy", getCreateBy())
            .append("createTime", getCreateTime())
            .append("updateBy", getUpdateBy())
            .append("updateTime", getUpdateTime())
            .toString();
    }
}

3.mapper

mapper定义具体操作数据库的方法，提供给mybatis使用，例如：

selectSceneList定义后，在xml里面调用

 4.service

服务分为2个，一个是服务实现层：

一个是服务定义层：