专三、mcg-helper一键生成jeecg框架单表功能模块
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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;@Repositorypublic 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<McgHelperUserEntity> 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<McgHelperUserEntity> 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")<!DOCTYPE html><html lang="en">#parse("content/base/back/common/head.vm")<link rel="stylesheet" href="$!{basePath}/plug-in-ui/hplus/css/font-awesome.css"/><body style='overflow:scroll;overflow-x:hidden'><div class="container bs-docs-container" style="width:100%;"><div class="row"><form role="form" class="form-inline" action="$!{basePath}/demo/mcgHelperUserController.do?list" method="post" id="formSubmit"><div class="col-md-10" style="width:100%"><div class="panel panel-default"><div class="panel-heading">列表</div><div class="panel-body"><div class="search"> <div class="form-group col-sm-3"><label for="name" class="control-label col-sm-3 line34">用户名</label><div class="col-sm-8"><input type="text" name="userName" id="userName" value="$!{mcgHelperUserEntity.userName}" class="form-control"></div> </div> <button type="submit" class="btn btn-primary"><i class="fa fa-search"></i> 搜 索</button><div class="clearfix"></div></div><div id="legend"><legend class="le"><button type="button" class="btn btn-primary" onclick="doUrl('$!{basePath}/demo/mcgHelperUserController.do?toAdd')" ><i class="fa fa-plus"></i> 新增</button></legend> </div><table class="table table-striped"><thead> <th> <input type="checkbox" name="ckAll" id="ckAll" /> </th> <th>用户名</th> <th>密码</th> <th>注册时间</th><th>操作</th></thead><tbody>#if($!{pageInfos})#foreach($!{info} in $!{pageInfos})<tr><td><input type="checkbox" name="ck" value="$!{info.id}" /></td><td>$!{info.userName}</td> <td>$!{info.userPwd}</td> <td>$!{info.regTime}</td> <td class="last"><a class="btn btn-success btn-xs" href="javascript:doUrl('$!{basePath}/demo/mcgHelperUserController.do?toEdit&id=$!{info.id}&userName=$!{info.userName}')" ><i class="fa fa-edit"></i> 编辑</a><a class="btn btn-danger btn-xs" href="javascript:delData('$!{basePath}/demo/mcgHelperUserController.do?doDelete&id=$!{info.id}&userName=$!{info.userName}')"><i class="fa fa-trash-o"></i> 删除</a><a class="btn btn-success btn-xs" href="javascript:doUrl('$!{basePath}/demo/mcgHelperUserController.do?toDetail&id=$!{info.id}&userName=$!{info.userName}')"><i class="fa fa-file-o"></i> 详情</a></td></tr> #end #end</tbody></table><div class="text-right"><!--公用翻页代码-->#set($attr='formSubmit')#showPageList($pageInfos $attr)<!--END公用翻页代码--></div></div></div></div> </form></div></div></body></html><script>$("#ckAll").click(function(){ if($(this).prop("checked")){ $(":checkbox").prop("checked",true) }else{ $(":checkbox").prop("checked",false) } }); //jquery获取复选框值 function getCkValue(){ var chk_value =[]; $('input[name="ck"]:checked').each(function(){ chk_value.push($(this).val()); }); //alert(chk_value.length==0 ?'你还没有选择任何内容！':chk_value); } </script> 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：
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- 专三、mcg-helper一键生成jeecg框架单表功能模块
- 专三、mcg-helper一键生成jeecg框架单表功能模块
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- 十二、mcg-helper业务系统单表业务模块自动化生成model类
- 十三、mcg-helper业务系统单表业务模块自动化生成xml映射文件
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