1、开发工具
VS2017、Oracle、PL/SQL、T4Toolbox
T4模板编辑工具 T4 Editor
2、数据库查询语句
2.1、oracle
--查询当前用户的所有表 SELECT TABLE_NAME FROM USER_TABLES; --根据表名查询表结构数据 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 = 'test'
2.2、mysql
--查询数据库表 string connectionString = "Data Source=.;Initial Catalog=NFineBase;User ID=sa;Password=hjf19870810;"; SqlConnection conn = new SqlConnection(connectionString); conn.Open(); System.Data.DataTable schema = conn.GetSchema("TABLES"); --通过数据库表查询表结构 SELECT 表名=sobj.name,字段名=scol.name,字段说明=sprop.[value] FROM syscolumns as scol inner join sys.sysobjects as sobj on scol.id=sobj.id and sobj.xtype='U' and sobj.name<>'dtproperties' left join sys.extended_properties as sprop on scol.id=sprop.major_id and scol.colid=sprop.minor_id where sobj.name='@tableName' and scol.name='@columnName'
2.3、sqlserver
--SQL 查询所有表名 SELECT NAME FROM SYSOBJECTS WHERE TYPE='U' SELECT * FROM INFORMATION_SCHEMA.TABLES --查询表的所有字段名 SELECT NAME FROM SYSCOLUMNS WHERE ID=OBJECT_ID(' 表名' )
3、生成类文件公用类 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 (!Directory.Exists(OutputPath)) { Directory.CreateDirectory(OutputPath); } 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; } } } }#>
4、T4模板文件
<#@ template debug="true" hostspecific="true" language="C#" #> <#@ output extension=".cs" #> <#@ assembly name="System.Data" #> <#@ assembly name="System.Xml" #> <#@ assembly name="System.Linq" #> <#@ assembly name="System.IO" #> <#@ assembly name="$(ProjectDir)LibOracle.ManagedDataAccess.dll" #> <#@ import namespace="System" #> <#@ import namespace="System.Xml" #> <#@ import namespace="System.Data" #> <#@ import namespace="System.IO" #> <#@ import namespace="System.Collections.Generic"#> <#@ import namespace="System.Linq"#> <#@ import namespace="Oracle.ManagedDataAccess.Client" #> <#@ include file="ModelAuto.ttinclude"#> <# var manager2 = new Manager(Host, GenerationEnvironment, true) { OutputPath = Path.GetDirectoryName(Host.TemplateFile)+"\DefaultModel"}; #> <# ModelManager manager = new ModelManager(); List<string> list=manager.GetTableList(); #> <# foreach (var item in list) { string tableName=item; DataTable table= manager.GetTableSchema(tableName); #> <# string tempTableName=manager.FirstCharToUpper(tableName); manager2.StartBlock(tempTableName+"Entity.cs"); #> /********************************************************* * Copyright (c) 2019 * All rights reserved. * * 文件名称：<#=tempTableName #>.cs * 摘 要：业务实体<#=tableName#>的对象 * * 当前版本：1.0.0 * * 作 者：test * 完成日期：<#=System.DateTime.Now.ToString("yyyy年MM月dd日") #> * *********************************************************/ using System; namespace Common.Entity { /// <summary> /// 业务实体<#= tableName #>的对象 /// </summary> [Serializable] public class <#= tempTableName #>Entity: BaseEntity, ITableInfo { #region Parameter List <# foreach(DataRow row in table.Rows) { #> private <#= manager.TransFromSqlType(row["数据类型"].ToString(),row["整数位"].ToString(),row["小数位"].ToString())#> <#= row["字段名"].ToString().ToLower()#> = <#= manager.MapValue(row["数据类型"].ToString(),row["整数位"].ToString(),row["小数位"].ToString()) #>; //<#= row["备注"]#> <#} #> private string tableName = "<#= tableName #>"; private string tableSchema = ""; #endregion #region Property List <# foreach(DataRow row in table.Rows) { #> /// <summary> /// <#=row["备注"]#> /// </summary> public <#= manager.TransFromSqlType(row["数据类型"].ToString(),row["整数位"].ToString(),row["小数位"].ToString())#> <#= manager.FirstCharToUpper(row["字段名"].ToString())#> { get { return <#= row["字段名"].ToString().ToLower() #>; } set { <#= row["字段名"].ToString().ToLower() #> = value; } } <#} #> #endregion #region ITableInfo Members /// <summary> /// Database Table Name /// </summary> public string TableName { get { return tableName; } set { tableName = value; } } /// <summary> /// Database Table Schema /// </summary> public string TableSchema { get { return tableSchema; } set { tableSchema = value; } } #endregion } } <# 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=testPRO;USER ID=APP;PASSWORD=APP;"; /// <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; } public string FirstCharToUpper(string input) { if (String.IsNullOrEmpty(input)) throw new ArgumentException("ARGH!"); return input.First().ToString().ToUpper() + input.Substring(1).ToLower(); } public string MapValue(string type, string number, string small) { string dataType = TransFromSqlType(type, number, small); if (string.Equals(dataType, "string", StringComparison.OrdinalIgnoreCase)) { return "null"; } else { return dataType + ".MinValue"; } } /// <summary> /// SQL[不完善,需要的自己改造] /// </summary> /// <param name="type"></param> /// <returns></returns> public string TransFromSqlType(string type, string number, string small) { if (string.IsNullOrEmpty(type)) { return string.Empty; } if (string.Equals(type, "number", StringComparison.OrdinalIgnoreCase)) { if (!string.IsNullOrEmpty(number)) { if (!string.IsNullOrEmpty(small) && int.Parse(small) > 0) { return "decimal"; } if (int.Parse(number) >= 10 && (string.IsNullOrEmpty(small) || (!string.IsNullOrEmpty(small)&&int.Parse(small)==0))) { return "Int64"; } else if (int.Parse(number) < 10 && (string.IsNullOrEmpty(small) || (!string.IsNullOrEmpty(small) && int.Parse(small) == 0))) { return "Int32"; } } else { return "Int32"; } } if (string.Equals(type, "date", StringComparison.OrdinalIgnoreCase)) { return "DateTime"; } else if (string.Equals(type, "nvarchar2", StringComparison.OrdinalIgnoreCase) || string.Equals(type, "char", StringComparison.OrdinalIgnoreCase)) { return "string"; } return "string"; } } #> <#+ public class OracleHelper { private static string oracleConnectionStr = "DATA SOURCE=testPRO;USER ID=APP;PASSWORD=APP;"; 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(); } } } } #>
生成文件如下图
5、T4模板语法
主要分为 1指令 2文本块 3指令块
<# 标准控制块 #> 可以包含语句。 <#= 表达式控制块 #> 可以包含表达式。 <#+ 类功能控制块 #> 可以包含方法、字段和属性，就像一个类的内部
5.1 指令
主要包括template, output, assembly, import, include等类型
$(SolutionDir):当前项目所在解决方案目录
$(ProjectDir):当前项目所在目录
$(TargetPath):当前项目编译输出文件绝对路径
$(TargetDir):当前项目编译输出目录，即web项目的Bin目录，控制台、类库项目bin目录下的debug或release目录(取决于当前的编译模式)
5.2 文本块
文本块直接向输出文件插入文本。 文本块没有特殊格式，就像我们刚才初体验中写的类一样。
5.3 指令块
标准控制块：
<# for(int i = 0; i < 4; i++) { #> Hello World! <# } #>
表达式控制块：
<# XmlDocument xDoc = new XmlDocument(); xDoc.Load(@"E:CSharpOverview.xml"); XmlAttributeCollection attributes = xDoc.Attributes; if (attributes != null) { foreach (XmlAttribute attr in attributes) { #><#= attr.Name #><# } } #>
类功能控制块：
<#+ public class OracleHelper { private static string oracleConnectionStr = "DATA SOURCE=testPRO;USER ID=APP;PASSWORD=APP;"; 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(); } } } } #>
更多的T4模板语法参考 https://docs.microsoft.com/zh-cn/visualstudio/modeling/code-generation-and-t4-text-templates?view=vs-2015