从壹开始前后端分离 [.netCore 填坑 ] 三十二║ 四种方法快速实现项目的半自动化搭建
更新
1、更新小伙伴 @大龄Giser 提出好点子:试试VS的插件扩展:VSIX、ItemProject等,将T4模板给制作插件,这里先记下,有懂的小伙伴可以自己先试试,我会在以后更新。
2、感谢小伙伴 @博客园董事长 的测试和指正,本文 T4 模板已经支持 Oracle
3、再次感谢小伙伴 @大龄Giser 关于 使用VSIX+ProjectTemplate创建项目模板,提供开源支持:https://www.cnblogs.com/OlderGiser/p/9796403.html
4、感谢群小伙伴 @jamee1696 提供技术支持,本文 T4 模板已经支持 Mysql
5、如果感觉 Blog.Core.Framework 层比较笨重,我单写了一个简单的生成框架文件的接口,可以查看 DbFirstController.cs 【推荐使用】
缘起
哈喽大家周二好呀,这个国庆过的真是懒洋洋呀,不知道大家的学习动力咋样了,刚一上班本人手中的项目也增加了,但是还是要抽出时间学习哒,为了不让老板大大天天催,所以更新会慢点儿 [ 哭笑 ] :bowtie:,不过在我的推荐下,公司下一个项目要我负责前后端分离,终于可以将这些派上用场了,中间的坑也会在以后的文章中,慢慢补充出来。
这几天简单想了想,还没有想好要开什么系列,就想到QQ群里有小伙伴问的较多的一些问题以及前边系列文章中的提到的,但是没有深入讲到的,再填一下坑,这样才是完整的嘛,大家要是看到之前的有任何不清楚的,或者想扩展的,可以在群里说一下,或者留言,我都会说到的。今天呢,就说说如果半自动化搭建项目,这个坑来自于之前的项目搭建文章《框架之六 || API项目整体搭建 6.1 仓储模式》的伏笔之一 —— 如何使用 T4 模板搭建项目。当然,我们不仅是简单说说实体类的创建,也会横向和纵向的讨论下,一个项目如何通过代码实现半自动化搭建。
说到这里大家应该已经明白了这篇文章的写作意图,就是搭建项目的问题,相信大家已经开发了几年了,都有自己的一套行之有效的办法或者是经验,当然这里就不说付费的了,付费的框架何其多,比如迪西客,普元或者力软等等,这都是好用的功能强大的付费框架,既然说技术,就不说付费的,咱们自己写,这里简单概括下今天要说到的:
0、手动粘贴复制 —— 可能现在还有小伙伴在用这个办法,效率是真的很低,虽然我偶尔也用哈哈,这里就不说了
1、动软代码生成器 —— 这个我入门的时候使用的神器,用了好久
2、通过 VSTO 来编写 Excel ,实现每一层的代码设计 —— 我没用过,但是见过,一个不错的思路
3、T4 模板 —— 这个是我这两年遇到的又一个神器,也是一直使用的,强烈推荐的
4、SqlSuagr(ORM)—— 自封装的一套逻辑,当然其他ORM也有,比如EF就很好
5、VSIX 扩展插件 —— 新的处理方案
今天咱们这几个方法都会说到,主要还是说一下通过 T4 模板,来把我们的整体框架半自动化起来。最终的效果截图是这样的:
框架截图
一、动软代码生成器搭建整体项目框架
相信很多的小伙伴应该使用过这个工具,还是很不错的,我也是用了有一段时间,虽然很小,但是功能确实很丰富,无论是生成实体类,还是生成简单三层,还是工厂模式等等,都可以使用,不仅支持单个表文件的操作,也支持整个数据库的批量生成,这里具体的不做叙述,因为不是本篇文章的重点,这里简单的说下使用方法以及效果图:
1、安装与使用
地址:http://www.maticsoft.com/download.aspx
安装还是很简单的,就是普通的 next ,想用的可以试试,这里就不做叙述了。
安装成功后,我们可以看到,通过连接相应的服务器,找到适当的数据库,就可以操作了,主要还是通过一套 cmt 模板来生成对应的 .cs 类文件,这些模板我们可以使用系统自带的(比如工厂模式模板),也可以自定义编辑,以满足我们不同项目的具体需求,我这里就演示下,如何把我的博客数据库(还是咱们一直用的这个数据库),生成简单工程框架。
经过短暂的等待后,我们的全部框架就这么出来了
当然这些后缀名等都可以配置,这里就不细说了,咱们随便看一下数据访问层的内容:
/** 版本信息模板在安装目录下,可自行修改。 * BlogArticle.cs * * 功 能: N/A * 类 名: BlogArticle * * Ver 变更日期 负责人 变更内容 * ─────────────────────────────────── * V0.01 2018/10/8 23:46:56 N/A 初版 * * Copyright (c) 2012 Maticsoft Corporation. All rights reserved. *┌──────────────────────────────────┐ *│ 此技术信息为本公司机密信息,未经本公司书面同意禁止向第三方披露. │ *│ 版权所有:动软卓越(北京)科技有限公司 │ *└──────────────────────────────────┘ */ using System; using System.Data; using System.Text; using System.Data.SqlClient; using Maticsoft.IDAL; using Maticsoft.DBUtility;//Please add references namespace Maticsoft.SQLServerDAL { /// <summary> /// 数据访问类:BlogArticle /// </summary> public partial class BlogArticle:IBlogArticle { public BlogArticle() {} #region BasicMethod /// <summary> /// 得到最大ID /// </summary> public int GetMaxId() { return DbHelperSQL.GetMaxID("bID", "BlogArticle"); } /// <summary> /// 是否存在该记录 /// </summary> public bool Exists(int bID) { StringBuilder strSql=new StringBuilder(); strSql.Append("select count(1) from BlogArticle"); strSql.Append(" where bID=@bID"); SqlParameter[] parameters = { new SqlParameter("@bID", SqlDbType.Int,4) }; parameters[0].Value = bID; return DbHelperSQL.Exists(strSql.ToString(),parameters); } /// <summary> /// 增加一条数据 /// </summary> public int Add(Maticsoft.Model.BlogArticle model) { StringBuilder strSql=new StringBuilder(); strSql.Append("insert into BlogArticle("); strSql.Append("bsubmitter,btitle,bcategory,bcontent,btraffic,bcommentNum,bUpdateTime,bCreateTime,bRemark)"); strSql.Append(" values ("); strSql.Append("@bsubmitter,@btitle,@bcategory,@bcontent,@btraffic,@bcommentNum,@bUpdateTime,@bCreateTime,@bRemark)"); strSql.Append(";select @@IDENTITY"); SqlParameter[] parameters = { new SqlParameter("@bsubmitter", SqlDbType.NVarChar,60), new SqlParameter("@btitle", SqlDbType.NVarChar,256), new SqlParameter("@bcategory", SqlDbType.NVarChar,-1), new SqlParameter("@bcontent", SqlDbType.Text), new SqlParameter("@btraffic", SqlDbType.Int,4), new SqlParameter("@bcommentNum", SqlDbType.Int,4), new SqlParameter("@bUpdateTime", SqlDbType.DateTime), new SqlParameter("@bCreateTime", SqlDbType.DateTime), new SqlParameter("@bRemark", SqlDbType.NVarChar,-1)}; parameters[0].Value = model.bsubmitter; parameters[1].Value = model.btitle; parameters[2].Value = model.bcategory; parameters[3].Value = model.bcontent; parameters[4].Value = model.btraffic; parameters[5].Value = model.bcommentNum; parameters[6].Value = model.bUpdateTime; parameters[7].Value = model.bCreateTime; parameters[8].Value = model.bRemark; object obj = DbHelperSQL.GetSingle(strSql.ToString(),parameters); if (obj == null) { return 0; } else { return Convert.ToInt32(obj); } } /// <summary> /// 更新一条数据 /// </summary> public bool Update(Maticsoft.Model.BlogArticle model) { StringBuilder strSql=new StringBuilder(); strSql.Append("update BlogArticle set "); strSql.Append("bsubmitter=@bsubmitter,"); strSql.Append("btitle=@btitle,"); strSql.Append("bcategory=@bcategory,"); strSql.Append("bcontent=@bcontent,"); strSql.Append("btraffic=@btraffic,"); strSql.Append("bcommentNum=@bcommentNum,"); strSql.Append("bUpdateTime=@bUpdateTime,"); strSql.Append("bCreateTime=@bCreateTime,"); strSql.Append("bRemark=@bRemark"); strSql.Append(" where bID=@bID"); SqlParameter[] parameters = { new SqlParameter("@bsubmitter", SqlDbType.NVarChar,60), new SqlParameter("@btitle", SqlDbType.NVarChar,256), new SqlParameter("@bcategory", SqlDbType.NVarChar,-1), new SqlParameter("@bcontent", SqlDbType.Text), new SqlParameter("@btraffic", SqlDbType.Int,4), new SqlParameter("@bcommentNum", SqlDbType.Int,4), new SqlParameter("@bUpdateTime", SqlDbType.DateTime), new SqlParameter("@bCreateTime", SqlDbType.DateTime), new SqlParameter("@bRemark", SqlDbType.NVarChar,-1), new SqlParameter("@bID", SqlDbType.Int,4)}; parameters[0].Value = model.bsubmitter; parameters[1].Value = model.btitle; parameters[2].Value = model.bcategory; parameters[3].Value = model.bcontent; parameters[4].Value = model.btraffic; parameters[5].Value = model.bcommentNum; parameters[6].Value = model.bUpdateTime; parameters[7].Value = model.bCreateTime; parameters[8].Value = model.bRemark; parameters[9].Value = model.bID; int rows=DbHelperSQL.ExecuteSql(strSql.ToString(),parameters); if (rows > 0) { return true; } else { return false; } } /// <summary> /// 删除一条数据 /// </summary> public bool Delete(int bID) { StringBuilder strSql=new StringBuilder(); strSql.Append("delete from BlogArticle "); strSql.Append(" where bID=@bID"); SqlParameter[] parameters = { new SqlParameter("@bID", SqlDbType.Int,4) }; parameters[0].Value = bID; int rows=DbHelperSQL.ExecuteSql(strSql.ToString(),parameters); if (rows > 0) { return true; } else { return false; } } /// <summary> /// 批量删除数据 /// </summary> public bool DeleteList(string bIDlist ) { StringBuilder strSql=new StringBuilder(); strSql.Append("delete from BlogArticle "); strSql.Append(" where bID in ("+bIDlist + ") "); int rows=DbHelperSQL.ExecuteSql(strSql.ToString()); if (rows > 0) { return true; } else { return false; } } /// <summary> /// 得到一个对象实体 /// </summary> public Maticsoft.Model.BlogArticle GetModel(int bID) { StringBuilder strSql=new StringBuilder(); strSql.Append("select top 1 bID,bsubmitter,btitle,bcategory,bcontent,btraffic,bcommentNum,bUpdateTime,bCreateTime,bRemark from BlogArticle "); strSql.Append(" where bID=@bID"); SqlParameter[] parameters = { new SqlParameter("@bID", SqlDbType.Int,4) }; parameters[0].Value = bID; Maticsoft.Model.BlogArticle model=new Maticsoft.Model.BlogArticle(); DataSet ds=DbHelperSQL.Query(strSql.ToString(),parameters); if(ds.Tables[0].Rows.Count>0) { return DataRowToModel(ds.Tables[0].Rows[0]); } else { return null; } } /// <summary> /// 得到一个对象实体 /// </summary> public Maticsoft.Model.BlogArticle DataRowToModel(DataRow row) { Maticsoft.Model.BlogArticle model=new Maticsoft.Model.BlogArticle(); if (row != null) { if(row["bID"]!=null && row["bID"].ToString()!="") { model.bID=int.Parse(row["bID"].ToString()); } if(row["bsubmitter"]!=null) { model.bsubmitter=row["bsubmitter"].ToString(); } if(row["btitle"]!=null) { model.btitle=row["btitle"].ToString(); } if(row["bcategory"]!=null) { model.bcategory=row["bcategory"].ToString(); } if(row["bcontent"]!=null) { model.bcontent=row["bcontent"].ToString(); } if(row["btraffic"]!=null && row["btraffic"].ToString()!="") { model.btraffic=int.Parse(row["btraffic"].ToString()); } if(row["bcommentNum"]!=null && row["bcommentNum"].ToString()!="") { model.bcommentNum=int.Parse(row["bcommentNum"].ToString()); } if(row["bUpdateTime"]!=null && row["bUpdateTime"].ToString()!="") { model.bUpdateTime=DateTime.Parse(row["bUpdateTime"].ToString()); } if(row["bCreateTime"]!=null && row["bCreateTime"].ToString()!="") { model.bCreateTime=DateTime.Parse(row["bCreateTime"].ToString()); } if(row["bRemark"]!=null) { model.bRemark=row["bRemark"].ToString(); } } return model; } /// <summary> /// 获得数据列表 /// </summary> public DataSet GetList(string strWhere) { StringBuilder strSql=new StringBuilder(); strSql.Append("select bID,bsubmitter,btitle,bcategory,bcontent,btraffic,bcommentNum,bUpdateTime,bCreateTime,bRemark "); strSql.Append(" FROM BlogArticle "); if(strWhere.Trim()!="") { strSql.Append(" where "+strWhere); } return DbHelperSQL.Query(strSql.ToString()); } /// <summary> /// 获得前几行数据 /// </summary> public DataSet GetList(int Top,string strWhere,string filedOrder) { StringBuilder strSql=new StringBuilder(); strSql.Append("select "); if(Top>0) { strSql.Append(" top "+Top.ToString()); } strSql.Append(" bID,bsubmitter,btitle,bcategory,bcontent,btraffic,bcommentNum,bUpdateTime,bCreateTime,bRemark "); strSql.Append(" FROM BlogArticle "); if(strWhere.Trim()!="") { strSql.Append(" where "+strWhere); } strSql.Append(" order by " + filedOrder); return DbHelperSQL.Query(strSql.ToString()); } /// <summary> /// 获取记录总数 /// </summary> public int GetRecordCount(string strWhere) { StringBuilder strSql=new StringBuilder(); strSql.Append("select count(1) FROM BlogArticle "); if(strWhere.Trim()!="") { strSql.Append(" where "+strWhere); } object obj = DbHelperSQL.GetSingle(strSql.ToString()); if (obj == null) { return 0; } else { return Convert.ToInt32(obj); } } /// <summary> /// 分页获取数据列表 /// </summary> public DataSet GetListByPage(string strWhere, string orderby, int startIndex, int endIndex) { StringBuilder strSql=new StringBuilder(); strSql.Append("SELECT * FROM ( "); strSql.Append(" SELECT ROW_NUMBER() OVER ("); if (!string.IsNullOrEmpty(orderby.Trim())) { strSql.Append("order by T." + orderby ); } else { strSql.Append("order by T.bID desc"); } strSql.Append(")AS Row, T.* from BlogArticle T "); if (!string.IsNullOrEmpty(strWhere.Trim())) { strSql.Append(" WHERE " + strWhere); } strSql.Append(" ) TT"); strSql.AppendFormat(" WHERE TT.Row between {0} and {1}", startIndex, endIndex); return DbHelperSQL.Query(strSql.ToString()); } /* /// <summary> /// 分页获取数据列表 /// </summary> public DataSet GetList(int PageSize,int PageIndex,string strWhere) { SqlParameter[] parameters = { new SqlParameter("@tblName", SqlDbType.VarChar, 255), new SqlParameter("@fldName", SqlDbType.VarChar, 255), new SqlParameter("@PageSize", SqlDbType.Int), new SqlParameter("@PageIndex", SqlDbType.Int), new SqlParameter("@IsReCount", SqlDbType.Bit), new SqlParameter("@OrderType", SqlDbType.Bit), new SqlParameter("@strWhere", SqlDbType.VarChar,1000), }; parameters[0].Value = "BlogArticle"; parameters[1].Value = "bID"; parameters[2].Value = PageSize; parameters[3].Value = PageIndex; parameters[4].Value = 0; parameters[5].Value = 0; parameters[6].Value = strWhere; return DbHelperSQL.RunProcedure("UP_GetRecordByPage",parameters,"ds"); }*/ #endregion BasicMethod #region ExtensionMethod #endregion ExtensionMethod } }
提示:如果你不想下载该软件,又想看看具体的代码,我已经提交到咱们的git 了,在wwwroot 文件夹中,大家可以看看
截图
打开看一下,基本的 CURD 方法都有,也有一些存储过程的调用等,而且可以自定义扩展,不得不说是一个神器,如果要开发 ADO.NET 多层,这个方法也不失为一个好的方案。
优点大家都看到了,快速,内容简洁丰富,各种存储过程分页方法很方便,不言而喻;
但是缺点也是有的,最大的就是不能像其他ORM框架那样,实现 Code First ,只能单纯的讲数据库信息提取出来;而且在编辑模板方面也没有 T4 那么容易操作,修改模板代码不是很方便,学习的难度稍微大了一些。
总结:如果不想用 T4 模板手动写模板代码,又不想引入框架,只想用 ADO.NET 搭建多层框架,动软代码生成器是一个不错的选择。
二、通过 VSTO 编写 Excel 来搭建整体项目框架
1、什么是VSTO?
VSTO(Visual Studio Tools For Office)就像名字一样,是Visual Studio开发Office的工具集。只是一套工具,用于简化.NET的Office开发。能够生成com组件或者标准dll的都能开发Office,比如c/c++,VB6,Delphi等等。原生.NET当然也可以。微软觉得.net开发Office不够方便,VSTO便诞生了。
1.决定要用.NET开发Office
2.在所有.NET开发Office的途径(原始,各种工具)中,选择了VSTO
2、如何新建一个 VSTO 项目
网上有一个栗子,大家可以参看着自己玩一玩:https://www.cnblogs.com/crhdyl/p/5289307.html。 对于这个方法,大家自己玩一玩就好了,这里就不说具体的教程了,毕竟不是本文重点。
QQ群里有一个小伙伴大神,他通过 VSTO 来写的一个框架,其实就是通过命令来将固定的格式进行输出,这里盗用一下他的图,应该还好吧,因为不知道他的博客园账号,就先不@他了,个人感觉这个还是很不错的,看着很溜
这个方法我现在也在学,不过只是做一个知识扩展来用,好处是,我们自己做一个Excel 工具后,走到哪里都可以使用,还很方便,自己随便自定义,不用受项目或者数据库的环境影响,特别是做展示的时候,很直观,比如开项目研讨会的时候,几个人讨论数据库表结构呀,生成的方法呀,总不能一个个软件都打开吧;
但是也有一些问题,毕竟局限性有些强,比如好像不能直接操作数据库,在大数据结构中,效率不高,而且不能直接生成文件,需要拷贝操作等;
通过上边两个栗子可以看出来,一个是连接数据库快捷,文件生成方便;一个自定义逻辑性强,展示直观,那有没有办法可以将两个优点结合起来呢,没错,就是T4模板了,耐心看完下边的讲解,你会发现很强大。
3、下载该工具
因为有很多小伙伴问到了这个工具,再经得作者同意以后(作者地址https://github.com/DevilX5,给大神点 Star !),拿到了工具和Code,有需要的小伙伴可以玩一玩:
工具:https://files.cnblogs.com/files/laozhang-is-phi/DxAddIn.rar
Github:https://github.com/DevilX5/DxAddIn
工具使用很简单,下载解压后,就是执行下这个文件,就会在你的Excel中,添加这个服务
你会在你的Excel中发现这个服务:
具体的操作,可以按照上边作者的动图来操作。
三、通过 T4 模板搭建整体项目框架
1、什么是 T4 模板
T4 (Text Template Transformation Toolkit) 是微软官方在 VisualStudio 2008+ 中开始使用的代码生成引擎。在 Visual Studio 中,“T4 文本模板”是由一些文本块和控制逻辑组成的混合模板,它可以生成文本文件。 在 Visual C# 或 Visual Basic 中,控制逻辑编写为程序代码的片段。生成的文件可以是任何类型的文本,例如网页、资源文件或任何语言的程序源代码。现在的VS中只要与代码生成相关的场景基本上都能找T4的身影,比如MVC的视图模板,Entity Framwork的DataContext模板等等。
2、在项目中通过T4实现数据库生成实体类
这里就不具体讲解 T4 语法了,大家可以自行学习,其实很简单,主要还是 C# 代码,下边你看过之后就能懂了,咱们首先先实现之前留下的一个伏笔 —— 将我们的数据库表利用T4 模板生成实体类,也就是 DbFirst。
1、首先在我们的项目中,新建一个类库 Blog.Core.FrameWork
2、在该类库下,新建文件夹 Blog.Core.FrameWork.Entity,用于单独存放我们的模板以及生成的实体类文件
3、在类库的根目录新建 ModelAuto.ttinclude 模板文件,用来控制我们的文件生成配置
可以直接新建一个文本文档,然后重命名即可
提示:初始状态下,代码不是高亮的,大家可以安装插件:下载地址,不过个人感觉并不是很好用。
//引入命名空间 <#@ assembly name="System.Core"#> <#@ assembly name="EnvDTE"#> <#@ import namespace="System.Collections.Generic"#> <#@ import namespace="System.IO"#> <#@ import namespace="System.Text"#> <#@ import namespace="Microsoft.VisualStudio.TextTemplating"#> <#+ //定义管理者 manager 实体类 class Manager { //定义一个 block 块,主要是应用在批量生产中 public struct Block { public String Name; public int Start, Length; } public List<Block> blocks = new List<Block>(); public Block currentBlock; public Block footerBlock = new Block(); public Block headerBlock = new Block(); public ITextTemplatingEngineHost host; public ManagementStrategy strategy; public StringBuilder template; public String OutputPath { get; set; } //构造函数,包含 host主机,模板,输出路径,创建管理策略 public Manager(ITextTemplatingEngineHost host, StringBuilder template, bool commonHeader) { this.host = host; this.template = template; OutputPath = String.Empty; strategy = ManagementStrategy.Create(host); } //开辟一个 block 块 public void StartBlock(String name) { currentBlock = new Block { Name = name, Start = template.Length }; } public void StartFooter() { footerBlock.Start = template.Length; } public void EndFooter() { footerBlock.Length = template.Length - footerBlock.Start; } public void StartHeader() { headerBlock.Start = template.Length; } public void EndHeader() { headerBlock.Length = template.Length - headerBlock.Start; } public void EndBlock() { currentBlock.Length = template.Length - currentBlock.Start; blocks.Add(currentBlock); } //定义进程,用来将所有的 blocks 块执行出来 public void Process(bool split) { String header = template.ToString(headerBlock.Start, headerBlock.Length); String footer = template.ToString(footerBlock.Start, footerBlock.Length); blocks.Reverse(); foreach(Block block in blocks) {//遍历 //输出文件 String fileName = Path.Combine(OutputPath, block.Name); if (split) { String content = header + template.ToString(block.Start, block.Length) + footer; strategy.CreateFile(fileName, content); template.Remove(block.Start, block.Length); } else { strategy.DeleteFile(fileName); } } } } //定义管理策略类 class ManagementStrategy { internal static ManagementStrategy Create(ITextTemplatingEngineHost host) { return (host is IServiceProvider) ? new VSManagementStrategy(host) : new ManagementStrategy(host); } internal ManagementStrategy(ITextTemplatingEngineHost host) { } internal virtual void CreateFile(String fileName, String content) { File.WriteAllText(fileName, content); } internal virtual void DeleteFile(String fileName) { if (File.Exists(fileName)) File.Delete(fileName); } } class VSManagementStrategy : ManagementStrategy { private EnvDTE.ProjectItem templateProjectItem; internal VSManagementStrategy(ITextTemplatingEngineHost host) : base(host) { IServiceProvider hostServiceProvider = (IServiceProvider)host; if (hostServiceProvider == null) throw new ArgumentNullException("Could not obtain hostServiceProvider"); EnvDTE.DTE dte = (EnvDTE.DTE)hostServiceProvider.GetService(typeof(EnvDTE.DTE)); if (dte == null) throw new ArgumentNullException("Could not obtain DTE from host"); templateProjectItem = dte.Solution.FindProjectItem(host.TemplateFile); } //创建文件 internal override void CreateFile(String fileName, String content) { base.CreateFile(fileName, content); ((EventHandler)delegate { templateProjectItem.ProjectItems.AddFromFile(fileName); }).BeginInvoke(null, null, null, null); } //删除文件 internal override void DeleteFile(String fileName) { ((EventHandler)delegate { FindAndDeleteFile(fileName); }).BeginInvoke(null, null, null, null); } //根据文件名删除文件 private void FindAndDeleteFile(String fileName) { foreach(EnvDTE.ProjectItem projectItem in templateProjectItem.ProjectItems) { if (projectItem.get_FileNames(0) == fileName) { projectItem.Delete(); return; } } } }#>
4、还是在类库根目录下新建 DbHelper.ttinclude 模板,主要是数据库操作类
<#+ class DbHelper { #region 获取数据库表结构 public static List<DbTable> GetDbTables(string connectionString, string database, string tables = null) { if (!string.IsNullOrEmpty(tables)) { tables = string.Format(" and obj.name in ('{0}')", tables.Replace(",", "','")); } #region 执行sql命令 string sql = string.Format(@"SELECT obj.name tablename, schem.name schemname, idx.rows, CAST ( CASE WHEN (SELECT COUNT(1) FROM sys.indexes WHERE object_id= obj.OBJECT_ID AND is_primary_key=1) >=1 THEN 1 ELSE 0 END AS BIT) HasPrimaryKey from {0}.sys.objects obj inner join {0}.dbo.sysindexes idx on obj.object_id=idx.id and idx.indid<=1 INNER JOIN {0}.sys.schemas schem ON obj.schema_id=schem.schema_id where type='U' {1} order by obj.name", database, tables); #endregion DataTable dt = GetDataTable(connectionString, sql); return dt.Rows.Cast<DataRow>().Select(row => new DbTable { TableName = row.Field<string>("tablename"), SchemaName = row.Field<string>("schemname"), Rows = row.Field<int>("rows"), HasPrimaryKey = row.Field<bool>("HasPrimaryKey") }).ToList(); } #endregion #region 获取表字段信息 public static List<DbColumn> GetDbColumns(string connectionString, string database, string tableName, string schema = "dbo") { #region 执行sql命令 string sql = string.Format(@" WITH indexCTE AS ( SELECT ic.column_id, ic.index_column_id, ic.object_id FROM {0}.sys.indexes idx INNER JOIN {0}.sys.index_columns ic ON idx.index_id = ic.index_id AND idx.object_id = ic.object_id WHERE idx.object_id =OBJECT_ID(@tableName) AND idx.is_primary_key=1 ) select colm.column_id ColumnID, CAST(CASE WHEN indexCTE.column_id IS NULL THEN 0 ELSE 1 END AS BIT) IsPrimaryKey, colm.name ColumnName, systype.name ColumnType, colm.is_identity IsIdentity, colm.is_nullable IsNullable, cast(colm.max_length as int) ByteLength, ( case when systype.name='nvarchar' and colm.max_length>0 then colm.max_length/2 when systype.name='nchar' and colm.max_length>0 then colm.max_length/2 when systype.name='ntext' and colm.max_length>0 then colm.max_length/2 else colm.max_length end ) CharLength, cast(colm.precision as int) Precision, cast(colm.scale as int) Scale, prop.value Remark from {0}.sys.columns colm inner join {0}.sys.types systype on colm.system_type_id=systype.system_type_id and colm.user_type_id=systype.user_type_id left join {0}.sys.extended_properties prop on colm.object_id=prop.major_id and colm.column_id=prop.minor_id LEFT JOIN indexCTE ON colm.column_id=indexCTE.column_id AND colm.object_id=indexCTE.object_id where colm.object_id=OBJECT_ID(@tableName) order by colm.column_id", database); #endregion SqlParameter param = new SqlParameter("@tableName", SqlDbType.NVarChar, 100) { Value = string.Format("{0}.{1}.{2}", database, schema, tableName) }; DataTable dt = GetDataTable(connectionString, sql, param); return dt.Rows.Cast<DataRow>().Select(row => new DbColumn() { ColumnID = row.Field<int>("ColumnID"), IsPrimaryKey = row.Field<bool>("IsPrimaryKey"), ColumnName = row.Field<string>("ColumnName"), ColumnType = row.Field<string>("ColumnType"), IsIdentity = row.Field<bool>("IsIdentity"), IsNullable = row.Field<bool>("IsNullable"), ByteLength = row.Field<int>("ByteLength"), CharLength = row.Field<int>("CharLength"), Scale = row.Field<int>("Scale"), Remark = row["Remark"].ToString() }).ToList(); } #endregion #region 获取 DataTable public static DataTable GetDataTable(string connectionString, string commandText, params SqlParameter[] parms) { using (SqlConnection connection = new SqlConnection(connectionString)) { SqlCommand command = connection.CreateCommand(); command.CommandText = commandText; command.Parameters.AddRange(parms); SqlDataAdapter adapter = new SqlDataAdapter(command); DataTable dt = new DataTable(); adapter.Fill(dt); return dt; } } #endregion #region 获取主键 public static string GetPrimaryKey(List<DbColumn> dbColumns) { string primaryKey = string.Empty; if (dbColumns!=null&&dbColumns.Count>0) { foreach (var item in dbColumns) { if (item.IsPrimaryKey==true) { primaryKey = item.ColumnName; } } } return primaryKey; } #endregion } class DbTable { /// <summary> /// 表名称 /// </summary> public string TableName { get; set; } /// <summary> /// 表的架构 /// </summary> public string SchemaName { get; set; } /// <summary> /// 表的记录数 /// </summary> public int Rows { get; set; } /// <summary> /// 是否含有主键 /// </summary> public bool HasPrimaryKey { get; set; } } class DbColumn { /// <summary> /// 字段ID /// </summary> public int ColumnID { get; set; } /// <summary> /// 是否主键 /// </summary> public bool IsPrimaryKey { get; set; } /// <summary> /// 字段名称 /// </summary> public string ColumnName { get; set; } /// <summary> /// 字段类型 /// </summary> public string ColumnType { get; set; } /// <summary> /// 数据库类型对应的C#类型 /// </summary> public string CSharpType { get { return SqlServerDbTypeMap.MapCsharpType(ColumnType); } } /// <summary> /// /// </summary> public Type CommonType { get { return SqlServerDbTypeMap.MapCommonType(ColumnType); } } /// <summary> /// 字节长度 /// </summary> public int ByteLength { get; set; } /// <summary> /// 字符长度 /// </summary> public int CharLength { get; set; } /// <summary> /// 小数位 /// </summary> public int Scale { get; set; } /// <summary> /// 是否自增列 /// </summary> public bool IsIdentity { get; set; } /// <summary> /// 是否允许空 /// </summary> public bool IsNullable { get; set; } /// <summary> /// 描述 /// </summary> public string Remark { get; set; } } class SqlServerDbTypeMap { public static string MapCsharpType(string dbtype) { if (string.IsNullOrEmpty(dbtype)) return dbtype; dbtype = dbtype.ToLower(); string csharpType = "object"; switch (dbtype) { case "bigint": csharpType = "long"; break; case "binary": csharpType = "byte[]"; break; case "bit": csharpType = "bool"; break; case "char": csharpType = "string"; break; case "date": csharpType = "DateTime"; break; case "datetime": csharpType = "DateTime"; break; case "datetime2": csharpType = "DateTime"; break; case "datetimeoffset": csharpType = "DateTimeOffset"; break; case "decimal": csharpType = "decimal"; break; case "float": csharpType = "double"; break; case "image": csharpType = "byte[]"; break; case "int": csharpType = "int"; break; case "money": csharpType = "decimal"; break; case "nchar": csharpType = "string"; break; case "ntext": csharpType = "string"; break; case "numeric": csharpType = "decimal"; break; case "nvarchar": csharpType = "string"; break; case "real": csharpType = "Single"; break; case "smalldatetime": csharpType = "DateTime"; break; case "smallint": csharpType = "short"; break; case "smallmoney": csharpType = "decimal"; break; case "sql_variant": csharpType = "object"; break; case "sysname": csharpType = "object"; break; case "text": csharpType = "string"; break; case "time": csharpType = "TimeSpan"; break; case "timestamp": csharpType = "byte[]"; break; case "tinyint": csharpType = "byte"; break; case "uniqueidentifier": csharpType = "Guid"; break; case "varbinary": csharpType = "byte[]"; break; case "varchar": csharpType = "string"; break; case "xml": csharpType = "string"; break; default: csharpType = "object"; break; } return csharpType; } public static Type MapCommonType(string dbtype) { if (string.IsNullOrEmpty(dbtype)) return Type.Missing.GetType(); dbtype = dbtype.ToLower(); Type commonType = typeof(object); switch (dbtype) { case "bigint": commonType = typeof(long); break; case "binary": commonType = typeof(byte[]); break; case "bit": commonType = typeof(bool); break; case "char": commonType = typeof(string); break; case "date": commonType = typeof(DateTime); break; case "datetime": commonType = typeof(DateTime); break; case "datetime2": commonType = typeof(DateTime); break; case "datetimeoffset": commonType = typeof(DateTimeOffset); break; case "decimal": commonType = typeof(decimal); break; case "float": commonType = typeof(double); break; case "image": commonType = typeof(byte[]); break; case "int": commonType = typeof(int); break; case "money": commonType = typeof(decimal); break; case "nchar": commonType = typeof(string); break; case "ntext": commonType = typeof(string); break; case "numeric": commonType = typeof(decimal); break; case "nvarchar": commonType = typeof(string); break; case "real": commonType = typeof(Single); break; case "smalldatetime": commonType = typeof(DateTime); break; case "smallint": commonType = typeof(short); break; case "smallmoney": commonType = typeof(decimal); break; case "sql_variant": commonType = typeof(object); break; case "sysname": commonType = typeof(object); break; case "text": commonType = typeof(string); break; case "time": commonType = typeof(TimeSpan); break; case "timestamp": commonType = typeof(byte[]); break; case "tinyint": commonType = typeof(byte); break; case "uniqueidentifier": commonType = typeof(Guid); break; case "varbinary": commonType = typeof(byte[]); break; case "varchar": commonType = typeof(string); break; case "xml": commonType = typeof(string); break; default: commonType = typeof(object); break; } return commonType; } } class config { //public static readonly string ConnectionString = "Data Source=.;Initial Catalog=WMBlogDB;User ID=sa;Password=666;"; public static readonly string ConnectionString = File.ReadAllText(@"D:\my-file\dbCountPsw2.txt").Trim(); public static readonly string DbDatabase = ""; public static readonly string TableName = ""; }#>
具体的代码就不细讲了,直接拷贝,或者下载我写好的代码即可。再次说明下,本文不会对 T4 语法继续深入研究。
5、实现生成全部实体类的模型设计,在Blog.Core.FrameWork.Entity文件夹下,新建 Blog.Core.FrameWork.Entity.tt 模板
填写代码
//如果要获取主机信息,记得把 hostspecific 设置成true <#@ template debug="false" hostspecific="True" language="C#" #> <#@ output extension=".cs" #> //导入命名空间组件 <#@ assembly name="System.Data" #> <#@ assembly name="System.xml" #> <#@ import namespace="System.Collections.Generic" #> <#@ import namespace="System.Data.SqlClient" #> <#@ import namespace="System.Data" #> <#@ assembly name="System.Core.dll" #> <#@ assembly name="System.Data.DataSetExtensions.dll" #> <#@ import namespace="System" #> <#@ import namespace="System.Xml" #> <#@ import namespace="System.Linq" #> <#@ import namespace="System.Collections.Generic" #> <#@ import namespace="System.IO" #> //引入我们的公共模板文件 <#@ include file="$(ProjectDir)DbHelper.ttinclude" #> <#@ include file="$(ProjectDir)ModelAuto.ttinclude" #> //定义我们的输出文件夹 <# var OutputPath1 = Path.GetDirectoryName(Host.TemplateFile)+"\\work"; if (!Directory.Exists(OutputPath1)) { Directory.CreateDirectory(OutputPath1); } var manager = new Manager(Host, GenerationEnvironment, true) { OutputPath = OutputPath1 }; #> //-------------------------------------------------------------------- // 此代码由T4模板自动生成 // 老张的哲学 生成时间 <#=DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")#> // 注意更新后会改变相应代码。 //-------------------------------------------------------------------- <# var tableName=config.TableName;//获取config配置中的表名,为单一生产使用 #> <# if(tableName!=""){//如果表名有值,表示是生成单一文件 #> //引用命名空间 using System; namespace Blog.Core.FrameWork.Entity { /// <summary> /// <#=tableName#> /// </summary> public class <#=tableName#>//可以在这里加上基类等 { //将全部字段遍历出来 <# foreach(DbColumn column in DbHelper.GetDbColumns(config.ConnectionString, config.DbDatabase, config.TableName)){#> public <#= column.CSharpType#><# if(column.CommonType.IsValueType && column.IsNullable){#>?<#}#> <#=column.ColumnName#> { get; set; } <#}#> } } //如果为空,表示要将整个数据库都生成出来 <# } else{ #> //连接数据库,打开 connect 连接 <# SqlConnection conn = new SqlConnection(config.ConnectionString); conn.Open(); System.Data.DataTable schema = conn.GetSchema("TABLES"); #> //遍历全部数据库表 <# foreach(System.Data.DataRow row in schema.Rows) { #> //开始启动block块,参数是实体类文件名 <# manager.StartBlock(row["TABLE_NAME"]+".cs"); #> //----------<#=row["TABLE_NAME"].ToString()#>开始---------- using System; namespace Blog.Core.FrameWork.Entity { /// <summary> /// <#=tableName#> /// </summary> public class <#=row["TABLE_NAME"].ToString()#>//可以在这里加上基类等 { //将该表下的字段都遍历出来,可以自定义获取数据描述等信息 <# foreach(DbColumn column in DbHelper.GetDbColumns(config.ConnectionString, config.DbDatabase, row["TABLE_NAME"].ToString() )){ #> public <#= column.CSharpType#> <# if(column.CommonType.IsValueType && column.IsNullable){#> ?<#}#> <#=column.ColumnName #> { get; set; } <#}#> } } //----------<#=row["TABLE_NAME"].ToString()#>结束---------- <# manager.EndBlock(); } manager.Process(true); } #>
这里我写的比较凌乱,大概就是这个逻辑,其实和 C# 特别相像,主要简单的看一看,就都会明白,这个时候我们保存文件 ctrl+S,如果你连接数据库正确的话,会发现已经生成了全部实体类文件。
随便打开一个实体类,就可以发现,和我们自己写的是一样的:是不是很方便!
//----------BlogArticle开始---------- using System; namespace Blog.Core.FrameWork.Entity { /// <summary> /// BlogArticle /// </summary> public class BlogArticle//可以在这里加上基类等 { //将该表下的字段都遍历出来,可以自定义获取数据描述等信息 public int bID { get; set; } public string bsubmitter { get; set; } public string btitle { get; set; } public string bcategory { get; set; } public string bcontent { get; set; } public int btraffic { get; set; } public int bcommentNum { get; set; } public DateTime bUpdateTime { get; set; } public DateTime bCreateTime { get; set; } public string bRemark { get; set; } } } //----------BlogArticle结束----------
这个时候你会问,这个既然这么好,能全部生成其他层么?没错,答案当然是肯定的!
3、实现整个系统框架模板
因为篇幅的问题,这里就不把代码粘贴出来了,大家自己去Github 上获取即可,最终的效果是酱紫的:
是不是很神奇!整个系统框架就在一瞬间就加载出来了,大家下载好后,只需要 ctrl + S 保存一下 tt 模板文件,就能全部生成,只需要把精力放到 Base 基类/基接口即可,以后数据库表结构无论如何变化都不怕!
注意:上边是整个项目都生成出来了,也成功的产生了 work 文件夹下,看似一切很自然,但是不小心就遇到了其他的问题:
我们打开 DbHelper.ttinclude 模板的最下边:
public static readonly string ConnectionString = File.Exists(@"D:\my-file\dbCountPsw2.txt") ? File.ReadAllText(@"D:\my-file\dbCountPsw2.txt").Trim(): "server=.;uid=sa;pwd=sa;database=WMBlogDB"; public static readonly string DbDatabase = ""; public static readonly string TableName = "";//单独生成一个表
就是上边,刚刚我们生成整个库的时候,这里是空的,如果现在填写了一个表明,比如 BlogArticle ,好吧,work 文件夹有了,但是没有生成指定的 cs 文件类,尴尬,然后就怀疑有 bug,
这个时候请打开 Blog.Core.FrameWork.tt 研究下生成的逻辑代码,简单的 if else:
4、Oracle 的T4模板
这里只有 Model 层的,其他的自行复制即可。
ModelAuto.ttinclude ,
<#@ assembly name="System.Core"#> <#@ assembly name="EnvDTE"#> <#@ import namespace="System.Collections.Generic"#> <#@ import namespace="System.IO"#> <#@ import namespace="System.Text"#> <#@ import namespace="Microsoft.VisualStudio.TextTemplating"#> <#+ class Manager { public struct Block { public String Name; public int Start, Length; } public List<Block> blocks = new List<Block>(); public Block currentBlock; public Block footerBlock = new Block(); public Block headerBlock = new Block(); public ITextTemplatingEngineHost host; public ManagementStrategy strategy; public StringBuilder template; public String OutputPath { get; set; } public Manager(ITextTemplatingEngineHost host, StringBuilder template, bool commonHeader) { this.host = host; this.template = template; OutputPath = String.Empty; strategy = ManagementStrategy.Create(host); } public void StartBlock(String name) { currentBlock = new Block { Name = name, Start = template.Length }; } public void StartFooter() { footerBlock.Start = template.Length; } public void EndFooter() { footerBlock.Length = template.Length - footerBlock.Start; } public void StartHeader() { headerBlock.Start = template.Length; } public void EndHeader() { headerBlock.Length = template.Length - headerBlock.Start; } public void EndBlock() { currentBlock.Length = template.Length - currentBlock.Start; blocks.Add(currentBlock); } public void Process(bool split) { String header = template.ToString(headerBlock.Start, headerBlock.Length); String footer = template.ToString(footerBlock.Start, footerBlock.Length); blocks.Reverse(); foreach(Block block in blocks) { String fileName = Path.Combine(OutputPath, block.Name); if (split) { String content = header + template.ToString(block.Start, block.Length) + footer; strategy.CreateFile(fileName, content); template.Remove(block.Start, block.Length); } else { strategy.DeleteFile(fileName); } } } } class ManagementStrategy { internal static ManagementStrategy Create(ITextTemplatingEngineHost host) { return (host is IServiceProvider) ? new VSManagementStrategy(host) : new ManagementStrategy(host); } internal ManagementStrategy(ITextTemplatingEngineHost host) { } internal virtual void CreateFile(String fileName, String content) { File.WriteAllText(fileName, content); } internal virtual void DeleteFile(String fileName) { if (File.Exists(fileName)) File.Delete(fileName); } } class VSManagementStrategy : ManagementStrategy { private EnvDTE.ProjectItem templateProjectItem; internal VSManagementStrategy(ITextTemplatingEngineHost host) : base(host) { IServiceProvider hostServiceProvider = (IServiceProvider)host; if (hostServiceProvider == null) throw new ArgumentNullException("Could not obtain hostServiceProvider"); EnvDTE.DTE dte = (EnvDTE.DTE)hostServiceProvider.GetService(typeof(EnvDTE.DTE)); if (dte == null) throw new ArgumentNullException("Could not obtain DTE from host"); templateProjectItem = dte.Solution.FindProjectItem(host.TemplateFile); } internal override void CreateFile(String fileName, String content) { base.CreateFile(fileName, content); ((EventHandler)delegate { templateProjectItem.ProjectItems.AddFromFile(fileName); }).BeginInvoke(null, null, null, null); } internal override void DeleteFile(String fileName) { ((EventHandler)delegate { FindAndDeleteFile(fileName); }).BeginInvoke(null, null, null, null); } private void FindAndDeleteFile(String fileName) { foreach(EnvDTE.ProjectItem projectItem in templateProjectItem.ProjectItems) { if (projectItem.get_FileNames(0) == fileName) { projectItem.Delete(); return; } } } }#>
生成 model 层 的代码
感谢小伙伴 @博客园董事长的测试和指正,以下代码正确,可以成功导出 Oracle,
<#@ template debug="true" hostspecific="true" language="C#" #> <#@ output extension=".cs" #> <#@ assembly name="System.Data" #> <#@ assembly name="System.Data.OracleClient" #> <#@ assembly name="System.Xml" #> <#@ import namespace="System" #> <#@ import namespace="System.Xml" #> <#@ import namespace="System.Data" #> <#@ import namespace="System.Data.OracleClient" #> <#@ import namespace="System.Collections.Generic"#> <#@ include file="$(ProjectDir)ModelAuto.ttinclude" #> <# var manager2 = new Manager(Host, GenerationEnvironment, true) { OutputPath = Path.GetDirectoryName(Host.TemplateFile)}; #> <# ModelManager manager = new ModelManager(); List<string> list=manager.GetTableList(); #> <# foreach (var item in list) { string tableName=item; DataTable table= manager.GetTableSchema(tableName); #> <# manager2.StartBlock(tableName+".cs"); #> using System; using System.Data; using System.Data.OracleClient; namespace Model { /// <summary> /// 数据表实体类:<#= tableName #> /// </summary> [Serializable()] public class <#= tableName #> { <# foreach(DataRow row in table.Rows) { #> /// <summary> /// <#=row["备注"]#> /// </summary> public <#= manager.TransFromSqlType(row["数据类型"].ToString())#> <#=row["字段名"]#>{ get; set; } <#} #> } } <# manager2.EndBlock(); #> <# } #> <# manager2.Process(true); #> <#+ public class ModelManager { /// <summary> /// 数据库连接字符串 /// </summary> private const string CONNECTION_STRING = "Data Source=orcl;Persist Security Info=True;User ID=jjmis;Password=jjmis;Unicode=True"; /// <summary> /// 用户信息表名 /// </summary> private const string PERSONINFO_TABLE_NAME = "USERINFO"; /// <summary> /// 根据表名查询表结构信息 /// </summary> private const string SELECT_SCHEMA_BY_TABLE_NAME = @"SELECT A.column_name 字段名, A.data_type 数据类型, A.data_length 长度, A.data_precision 整数位, A.Data_Scale 小数位, A.nullable 允许空值, A.Data_default 缺省值, B.comments 备注, A.TABLE_NAME 表名 FROM user_tab_columns A, user_col_comments B WHERE a.COLUMN_NAME = b.column_name AND A.Table_Name = B.Table_Name AND A.Table_Name = '{0}'"; /// <summary> /// 获得数据连接 /// </summary> /// <returns></returns> private OracleConnection GetConnection() { return new OracleConnection(CONNECTION_STRING); } /// <summary> /// 得到当前用户的所有表名 /// </summary> /// <returns></returns> public List<string> GetTableList() { string sql = "SELECT * FROM USER_TABLES"; DataTable dt = OracleHelper.ExecuteDataTable(sql); List<string> list = new List<string>(); if (dt!=null&&dt.Rows.Count>0) { for (int i = 0; i < dt.Rows.Count; i++) { list.Add(dt.Rows[i]["TABLE_NAME"].ToString()); } } return list; } /// <summary> /// 释放连接 /// </summary> /// <param name="con"></param> private void ReleaseConnection(OracleConnection con) { if (con != null) { if (con.State == ConnectionState.Open) { con.Close(); } } } public DataTable GetTableSchema(string tableName) { DataTable dt; using (OracleConnection con = GetConnection()) { con.Open(); OracleCommand cmd = con.CreateCommand(); cmd.CommandText = string.Format(SELECT_SCHEMA_BY_TABLE_NAME,tableName); cmd.CommandType = CommandType.Text; OracleDataAdapter adapter = new OracleDataAdapter(cmd); DataSet ds = new DataSet(); adapter.Fill(ds); dt = ds.Tables[0]; } return dt; } /// <summary> /// SQL[不完善,需要的自己改造] /// </summary> /// <param name="type"></param> /// <returns></returns> public string TransFromSqlType(string type) { if (string.IsNullOrEmpty(type)) { return string.Empty; } if (string.Equals(type, "number", StringComparison.OrdinalIgnoreCase)) { return "int"; } if (string.Equals(type, "date", StringComparison.OrdinalIgnoreCase)) { return "DateTime"; } else if (string.Equals(type, "nvarchar2", StringComparison.OrdinalIgnoreCase)) { return "string"; } return "string"; } } #> <#+ public class OracleHelper { private static string oracleConnectionStr = "Data Source=orcl;Persist Security Info=True;User ID=jjmis;Password=jjmis;Unicode=True"; public static DataTable ExecuteDataTable(string sql, params OracleParameter[] paramList) { using (OracleConnection conn = new OracleConnection(oracleConnectionStr)) { conn.Open(); using (OracleCommand command = conn.CreateCommand()) { command.CommandText = sql; command.Parameters.AddRange(paramList); DataTable dt = new DataTable(); OracleDataAdapter adapter = new OracleDataAdapter(command); adapter.Fill(dt); return dt; } } } public static int ExecuteNonQuery(string sql, params OracleParameter[] paramList) { using (OracleConnection conn = new OracleConnection(oracleConnectionStr)) { conn.Open(); using (OracleCommand command = conn.CreateCommand()) { command.CommandText = sql; command.Parameters.AddRange(paramList); return command.ExecuteNonQuery(); } } } public static object ExecuteScalar(string sql, params OracleParameter[] paramList) { using (OracleConnection conn = new OracleConnection(oracleConnectionStr)) { conn.Open(); using (OracleCommand command = conn.CreateCommand()) { command.CommandText = sql; command.Parameters.AddRange(paramList); return command.ExecuteScalar(); } } } } #>
5、Mysql 的T4模板
1、如果MySQL要生成大写的话,需要在my.ini中添加 lower_case_table_names=2,让mysql区分大小写,生成出来的就跟所设置的表名,字段名一样了,默认mysql在windows下不区分大小写。
2、可以看看下边评论区 吉喆吉 博友的意见。
对应的 Mysql 的 ModelAuto.ttinclude 内容:
//引入命名空间 <#@ assembly name="System.Core"#> <#@ assembly name="EnvDTE"#> <#@ import namespace="System.Collections.Generic"#> <#@ import namespace="System.IO"#> <#@ import namespace="System.Text"#> <#@ import namespace="Microsoft.VisualStudio.TextTemplating"#> <#+ //定义管理者 manager 实体类 class Manager { //定义一个 block 块,主要是应用在批量生产中 public struct Block { public String Name; public int Start, Length; } public List<Block> blocks = new List<Block>(); public Block currentBlock; public Block footerBlock = new Block(); public Block headerBlock = new Block(); public ITextTemplatingEngineHost host; public ManagementStrategy strategy; public StringBuilder template; public String OutputPath { get; set; } //构造函数,包含 host主机,模板,输出路径,创建管理策略 public Manager(ITextTemplatingEngineHost host, StringBuilder template, bool commonHeader) { this.host = host; this.template = template; OutputPath = String.Empty; strategy = ManagementStrategy.Create(host); } //开辟一个 block 块 public void StartBlock(String name) { currentBlock = new Block { Name = name, Start = template.Length }; } public void StartFooter() { footerBlock.Start = template.Length; } public void EndFooter() { footerBlock.Length = template.Length - footerBlock.Start; } public void StartHeader() { headerBlock.Start = template.Length; } public void EndHeader() { headerBlock.Length = template.Length - headerBlock.Start; } public void EndBlock() { currentBlock.Length = template.Length - currentBlock.Start; blocks.Add(currentBlock); } //定义进程,用来将所有的 blocks 块执行出来 public void Process(bool split) { String header = template.ToString(headerBlock.Start, headerBlock.Length); String footer = template.ToString(footerBlock.Start, footerBlock.Length); blocks.Reverse(); foreach(Block block in blocks) {//遍历 //输出文件 String fileName = Path.Combine(OutputPath, block.Name); if (split) { String content = header + template.ToString(block.Start, block.Length) + footer; strategy.CreateFile(fileName, content); template.Remove(block.Start, block.Length); } else { strategy.DeleteFile(fileName); } } } } //定义管理策略类 class ManagementStrategy { internal static ManagementStrategy Create(ITextTemplatingEngineHost host) { return (host is IServiceProvider) ? new VSManagementStrategy(host) : new ManagementStrategy(host); } internal ManagementStrategy(ITextTemplatingEngineHost host) { } internal virtual void CreateFile(String fileName, String content) { File.WriteAllText(fileName, content); } internal virtual void DeleteFile(String fileName) { if (File.Exists(fileName)) File.Delete(fileName); } } class VSManagementStrategy : ManagementStrategy { private EnvDTE.ProjectItem templateProjectItem; internal VSManagementStrategy(ITextTemplatingEngineHost host) : base(host) { IServiceProvider hostServiceProvider = (IServiceProvider)host; if (hostServiceProvider == null) throw new ArgumentNullException("Could not obtain hostServiceProvider"); EnvDTE.DTE dte = (EnvDTE.DTE)hostServiceProvider.GetService(typeof(EnvDTE.DTE)); if (dte == null) throw new ArgumentNullException("Could not obtain DTE from host"); templateProjectItem = dte.Solution.FindProjectItem(host.TemplateFile); } //创建文件 internal override void CreateFile(String fileName, String content) { base.CreateFile(fileName, content); ((EventHandler)delegate { templateProjectItem.ProjectItems.AddFromFile(fileName); }).BeginInvoke(null, null, null, null); } //删除文件 internal override void DeleteFile(String fileName) { ((EventHandler)delegate { FindAndDeleteFile(fileName); }).BeginInvoke(null, null, null, null); } //根据文件名删除文件 private void FindAndDeleteFile(String fileName) { foreach(EnvDTE.ProjectItem projectItem in templateProjectItem.ProjectItems) { if (projectItem.get_FileNames(0) == fileName) { projectItem.Delete(); return; } } } }#>
对应的 Mysql 的 MySqlHelper.ttinclude 内容:
<#+ public class EntityHelper { public static List<Entity> GetEntities(string connectionString, List<string> databases) { var list = new List<Entity>(); var conn = new MySqlConnection(connectionString); try { conn.Open(); var dbs = string.Join("','", databases.ToArray()); var cmd = string.Format(@"SELECT `information_schema`.`COLUMNS`.`TABLE_SCHEMA` ,`information_schema`.`COLUMNS`.`TABLE_NAME` ,`information_schema`.`COLUMNS`.`COLUMN_NAME` ,`information_schema`.`COLUMNS`.`DATA_TYPE` ,`information_schema`.`COLUMNS`.`COLUMN_COMMENT` FROM `information_schema`.`COLUMNS` WHERE `information_schema`.`COLUMNS`.`TABLE_SCHEMA` IN ('{0}') ", dbs); using (var reader = MySqlHelper.ExecuteReader(conn, cmd)) { while (reader.Read()) { var db = reader["TABLE_SCHEMA"].ToString(); var table = reader["TABLE_NAME"].ToString(); var column = reader["COLUMN_NAME"].ToString(); var type = reader["DATA_TYPE"].ToString(); var comment = reader["COLUMN_COMMENT"].ToString(); var entity = list.FirstOrDefault(x => x.EntityName == table); if(entity == null) { entity = new Entity(table); entity.Fields.Add(new Field { Name = column, Type = GetCLRType(type), Comment = comment }); list.Add(entity); } else { entity.Fields.Add(new Field { Name = column, Type = GetCLRType(type), Comment = comment }); } } } } finally { conn.Close(); } return list; } public static string GetCLRType(string dbType) { switch(dbType) { case "tinyint": case "smallint": case "mediumint": case "int": case "integer": return "int"; case "double": return "double"; case "float": return "float"; case "decimal": return "decimal"; case "numeric": case "real": return "decimal"; case "bit": return "bool"; case "date": case "time": case "year": case "datetime": case "timestamp": return "DateTime"; case "tinyblob": case "blob": case "mediumblob": case "longblog": case "binary": case "varbinary": return "byte[]"; case "char": case "varchar": case "tinytext": case "text": case "mediumtext": case "longtext": return "string"; case "point": case "linestring": case "polygon": case "geometry": case "multipoint": case "multilinestring": case "multipolygon": case "geometrycollection": case "enum": case "set": default: return dbType; } } } public class Entity { public Entity() { this.Fields = new List<Field>(); } public Entity(string name) : this() { this.EntityName = name; } public string EntityName { get;set; } public List<Field> Fields { get;set; } } public class Field { public string Name { get;set; } public string Type { get;set; } public string Comment { get;set; } } class config { public static readonly string ConnectionString = "Database=appsoft;Data Source=127.0.0.1;User Id=root;Password=123456;pooling=false;CharSet=utf8;port=3306"; public static readonly string DbDatabase = ""; public static readonly string TableName = ""; public static readonly string ModelNameSpace = "App.Entities"; public static readonly string IRepositoryNameSpace = "App.IRepository"; public static readonly string RepositoryNameSpace = "App.Repository"; public static readonly string IServicesNameSpace = "App.IServices"; public static readonly string ServicesNameSpace = "App.Services"; }#>
具体的Demo项目详情,可以下载:https://files.cnblogs.com/files/laozhang-is-phi/App.T4.MySql.rar
1、<#@ assembly name="C:\Users\youga\.nuget\packages\mysql.data\8.0.14\lib\net452\MySql.Data.dll" #> 修改为你的引用;
2、MySqlHelper.ttinclude 修改ConnectionString变量;
3、App.Entities.tt 修改connectionString变量;
4、可以根据自己的需求修改T4模板;
5、生成的类名都是小写,可否转化为帕斯卡命名规范(待解决);
四、SqlSugar等ORM框架来实现 DbFirst
一般的ORM都会有这个功能,无论是Code First ,还是根据数据库DB来生成 .cs 实体类,我的项目用的是Sqlsugar,所以也封装了响应的方法,
具体代码,可以参考 blog.core层下的 Controllers / DbFirst / DbFirstController.cs 文件,里边有对Repository、IRepository、Service、IService、Model层的自动生成接口,
代码很简单,看看就行了。
五、结语
今天也是在忙碌中,抽出时间写了写,主要是给大家分享了下,如何快速的半自动化的实现项目搭建,也算是一个小技巧了,重点说明了下 T4模板搭建全部层文件,个人感觉还是可行的,主要是灵活性很强,需要的小伙伴可以好好的研究一下,继续奋斗中!!!
感谢群内大神提供开源资料: