专三、mcg-helper一键生成jeecg框架单表功能模块

        今天给大家展示mcg-helper的魅力，既然是万能代码生成，那就小试牛刀一下，本次选择java开源快速开发框架jeecg（3.7.1版本）作为示例，一键生成jeecg单表业务模块，达到生成后无需二次编码即可运行的程度。首先，我们来看看mcg-helper流程图的实现：

        从流程图中“data控件”读取表结构信息自动转换映射为关系对象，“json控件”扩展数据（如：定义列表页面的有哪些查询条件字段，列表页面表格显示哪些字段，增加页面需要录入的字段，修改页面需要编辑的字段等等），再通过“js脚本控件”进行数据处理， 通常一个模块的业务数据紧密度较高，所以原则上使用一个js脚本控件就能够满足，当然你可以自己来设计，比如多个json控件或多个js脚本控件来将数据处理或划分得更细。“文本控件”获取到参数后，可自定义组装成你需要的代码。

        假设一个表结构，如下：

CREATE TABLE `mcg_helper_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '自增主键',
  `user_name` varchar(50) NOT NULL COMMENT '用户名',
  `user_pwd` varchar(255) DEFAULT NULL COMMENT '密码',
  `age` int(11) DEFAULT NULL COMMENT '年龄',
  `reg_time` datetime DEFAULT NULL COMMENT '注册时间',
  `update_time` timestamp NULL DEFAULT NULL COMMENT '更新时间',
  PRIMARY KEY (`id`,`user_name`)
) ENGINE=InnoDB AUTO_INCREMENT=19 DEFAULT CHARSET=utf8;

        指定生成的目录路径，一键生成后我们直接把jeecg运行起来，实际效果如下图！

        查询、新增、修改、详情、删除、分页功能均可以正常使用，在生成流程中定义哪些列表查询条件字段，表格显示哪些字段，新增显示哪些字段，修改显示哪些字段等等。当然只要你想做，实质上可以做得更细，更到位。单表业务生成相当简单，多表原理也一样。只要有标准、有规范、有规律可循，我们就能生成，越复杂麻烦的功能模块反而更值得去实现自动生成，假如一键生成后，这功能可以减少三天或以上的工作量，那就更值得拥有。

       

        我们来看看生成的代码（这里贴出几个生成后的完整代码文件）：

                            

package com.jeecg.mcghelperuser.entity;

import java.io.Serializable;
import java.util.Date;

/**
 * 
 * @Description: 业务表基本信息
 * @author:      mcg-helper
 * @date:        2017-11-21 17:49:08
 *
 */
public class McgHelperUserEntity implements Serializable {
    
    private static final long serialVersionUID = 1L;
    /* 自增主键  */
    private Integer id;
    /* 用户名  */
    private String userName;
    /* 密码  */
    private String userPwd;
    /* 年龄  */
    private Integer age;
    /* 注册时间  */
    private Date regTime;
    /* 更新时间  */
    private Date updateTime;
    
    public Integer getId() {
        return this.id;
    }
    public String getUserName() {
        return this.userName;
    }
    public String getUserPwd() {
        return this.userPwd;
    }
    public Integer getAge() {
        return this.age;
    }
    public Date getRegTime() {
        return this.regTime;
    }
    public Date getUpdateTime() {
        return this.updateTime;
    }
   
    public void setId(Integer id) {
        this.id = id;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public void setUserPwd(String userPwd) {
        this.userPwd = userPwd;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    public void setRegTime(Date regTime) {
        this.regTime = regTime;
    }
    public void setUpdateTime(Date updateTime) {
        this.updateTime = updateTime;
    }
  
}

 

package com.jeecg.mcghelperuser.dao;

import org.jeecgframework.minidao.annotation.Param;
import org.jeecgframework.minidao.annotation.ResultType;
import org.jeecgframework.minidao.annotation.Sql;
import org.jeecgframework.minidao.pojo.MiniDaoPage;
import org.springframework.stereotype.Repository;

import com.jeecg.mcghelperuser.entity.McgHelperUserEntity;

@Repository
public interface McgHelperUserDao{

    @Sql("SELECT * FROM mcg_helper_user WHERE id = :id and user_name = :userName")
    McgHelperUserEntity get(@Param("id") Integer id, @Param("userName") String userName);
    
    int update(@Param("mcgHelperUserEntity") McgHelperUserEntity mcgHelperUserEntity);
    
    void insert(@Param("mcgHelperUserEntity") McgHelperUserEntity mcgHelperUserEntity);
    
    @ResultType(McgHelperUserEntity.class)
    public MiniDaoPage getAll(@Param("mcgHelperUserEntity") McgHelperUserEntity mcgHelperUserEntity, @Param("page") int page, @Param("rows") int rows);
    
    @Sql("DELETE from mcg_helper_user WHERE id = :mcgHelperUserEntity.id and user_name = :mcgHelperUserEntity.userName")
    public void delete(@Param("mcgHelperUserEntity") McgHelperUserEntity mcgHelperUserEntity);
    
}

package com.jeecg.mcghelperuser.web;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.velocity.VelocityContext;
import org.jeecgframework.minidao.pojo.MiniDaoPage;
import org.jeecgframework.p3.core.common.utils.AjaxJson;
import org.jeecgframework.p3.core.page.SystemTools;
import org.jeecgframework.p3.core.util.plugin.ViewVelocity;
import org.jeecgframework.p3.core.web.BaseController;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import com.jeecg.mcghelperuser.entity.McgHelperUserEntity;
import com.jeecg.mcghelperuser.service.McgHelperUserService;

@Controller
@RequestMapping("/demo/mcgHelperUserController")
public class McgHelperUserController extends BaseController {
    @Autowired
    private McgHelperUserService mcgHelperUserService;

    @RequestMapping(params = "list", method = { RequestMethod.GET, RequestMethod.POST })
    public void list(@ModelAttribute McgHelperUserEntity mcgHelperUserEntity, HttpServletRequest request, HttpServletResponse response,
            @RequestParam(required = false, value = "pageNo", defaultValue = "1") int pageNo, @RequestParam(required = false, value = "pageSize", defaultValue = "10") int pageSize)
            throws Exception {
        try {
            // 分页数据
            MiniDaoPage list = mcgHelperUserService.getAll(mcgHelperUserEntity, pageNo, pageSize);
            VelocityContext velocityContext = new VelocityContext();
            velocityContext.put("mcgHelperUserEntity", mcgHelperUserEntity);
            velocityContext.put("pageInfos", SystemTools.convertPaginatedList(list));
            String viewName = "demo/mcghelperuser/mcghelperuser-list.vm";
            ViewVelocity.view(request, response, viewName, velocityContext);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @RequestMapping(params = "toDetail", method = RequestMethod.GET)
    public void mcgHelperUserEntityDetail(@RequestParam(required = true, value = "id") Integer id, @RequestParam(required = true, value = "userName") String userName, HttpServletResponse response, HttpServletRequest request) throws Exception {
        VelocityContext velocityContext = new VelocityContext();
        String viewName = "demo/mcghelperuser/mcghelperuser-detail.vm";
        McgHelperUserEntity mcgHelperUserEntity = mcgHelperUserService.get(id, userName);
        velocityContext.put("mcgHelperUserEntity", mcgHelperUserEntity);
        ViewVelocity.view(request, response, viewName, velocityContext);
    }

    @RequestMapping(params = "toAdd", method = { RequestMethod.GET, RequestMethod.POST })
    public void toAddDialog(HttpServletRequest request, HttpServletResponse response) throws Exception {
        VelocityContext velocityContext = new VelocityContext();
        String viewName = "demo/mcghelperuser/mcghelperuser-add.vm";
        ViewVelocity.view(request, response, viewName, velocityContext);
    }

    @RequestMapping(params = "doAdd", method = { RequestMethod.GET, RequestMethod.POST })
    @ResponseBody
    public AjaxJson doAdd(@ModelAttribute McgHelperUserEntity mcgHelperUserEntity) {
        AjaxJson j = new AjaxJson();
        try {
            mcgHelperUserService.insert(mcgHelperUserEntity);
            j.setMsg("保存成功");
        } catch (Exception e) {
            log.info(e.getMessage());
            j.setSuccess(false);
            j.setMsg("保存失败");
        }
        return j;
    }

    @RequestMapping(params = "toEdit", method = RequestMethod.GET)
    
    public void toEdit(@RequestParam(required = true, value = "id") Integer id, @RequestParam(required = true, value = "userName") String userName, HttpServletResponse response, HttpServletRequest request) throws Exception {
        VelocityContext velocityContext = new VelocityContext();
        McgHelperUserEntity mcgHelperUserEntity = mcgHelperUserService.get(id, userName);
        velocityContext.put("mcgHelperUserEntity", mcgHelperUserEntity);
        String viewName = "demo/mcghelperuser/mcghelperuser-edit.vm";
        ViewVelocity.view(request, response, viewName, velocityContext);
    }

    @RequestMapping(params = "doEdit", method = { RequestMethod.GET, RequestMethod.POST })
    @ResponseBody
    public AjaxJson doEdit(@ModelAttribute McgHelperUserEntity mcgHelperUserEntity) {
        AjaxJson j = new AjaxJson();
        try {
            mcgHelperUserService.update(mcgHelperUserEntity);
            j.setMsg("编辑成功");
        } catch (Exception e) {
            log.info(e.getMessage());
            j.setSuccess(false);
            j.setMsg("编辑失败");
        }
        return j;
    }

    @RequestMapping(params = "doDelete", method = RequestMethod.GET)
    @ResponseBody
    public AjaxJson doDelete(@RequestParam(required = true, value = "id") Integer id, @RequestParam(required = true, value = "userName") String userName) {
        AjaxJson j = new AjaxJson();
        try {
            McgHelperUserEntity mcgHelperUserEntity = new McgHelperUserEntity();
            mcgHelperUserEntity.setId(id);
            mcgHelperUserEntity.setUserName(userName);
             
            mcgHelperUserService.delete(mcgHelperUserEntity);
            j.setMsg("删除成功");
        } catch (Exception e) {
            log.info(e.getMessage());
            j.setSuccess(false);
            j.setMsg("删除失败");
        }
        return j;
    }

}

#parse("content/base/back/common/macro.vm")


#parse("content/base/back/common/head.vm")


	

		

			

				

					

						
列表
						

							

							
								 

									用户名
									

										
									
								 
										 
								 搜  索
								

							
							

								
 新增
 
							
							
								#if($!{pageInfos})
									#foreach($!{info} in $!{pageInfos})
										
									 #end
								 #end
								

								

					        		

					        		 
					        		
									    
用户名
									    
密码
									    
注册时间
									
操作
								
								
			
											

											
$!{info.userName}
			  
											
$!{info.userPwd}
			  
											
$!{info.regTime}
			  
											

											 编辑
											 删除
											 详情
											
										
							
							

								
								#set($attr='formSubmit')
								#showPageList($pageInfos $attr)
								
							
						
					
				
  
			
		
	

      

        从代码生成实现的角度上，我相信优化的空间还很大，我们能够不断的摸索提炼，让代码生成的实现设计更简单，而且能够支持更复杂的需求。以后要是换公司或换研发框架，针对业务编写几套自动生成，虽然谈不上高枕无忧，但也会轻松不少。为让大家更好的认识和使用mcg-helper，现推出更具营养的“使用指南”视频教程，https://pan.baidu.com/s/1sliEqhJ#list/path=%2F%E4%BD%BF%E7%94%A8%E6%8C%87%E5%8D%97 , 感谢大家的支持！最后贴上一份百度云盘的分享截图：