重写代码生成器支持模板（多层架构，MVC），多语言c#,java；支持mysql和sqlserver，动态编译

多年前用过李天平前辈的，自己改过，后来李老师做动软了，不给源码，修改不是很方便。加上我目前需要转java方向，于是决定自己搞。到目前为止花了整整一个星期了，看看目前的成果。

最后是代码工程文件，用c#开发的，IDE是vs2010

为了实现最大的模板自由，设计了专有的模板语法。基于C#，但是已经做到尽量简化，对有一点开发经验的同行应该是很好上手的。

目前c#的代码模板已经做了一些通用样例，接下来做java的开发代码模板。

总之，为了提高效率，并且规范项目团队成员的代码书写。

下面把核心的代码两个类文件贴出来，分别是动态编译和模板解析

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.CodeDom.Compiler;
 using System.Reflection;

 namespace CodeMaker.Engine
 {
     public class Compiler
     {
         /// <summary>
         /// 普通代码编译执行出字符串
         /// </summary>
         /// <param name="strCode"></param>
         /// <returns></returns>
         public static string DoCompile(string strCode)
         {

             StringBuilder strResults = new StringBuilder();

             CodeDomProvider provider = CodeDomProvider.CreateProvider("CSharp");

             //CompilerParameters 编译参数
             CompilerParameters objCompilerParameters = new CompilerParameters();
             objCompilerParameters.ReferencedAssemblies.Add("System.dll");
             objCompilerParameters.ReferencedAssemblies.Add("System.Core.dll");
             objCompilerParameters.ReferencedAssemblies.Add("System.Data.dll");
             objCompilerParameters.ReferencedAssemblies.Add("CodeMaker.BLL.dll");
             objCompilerParameters.ReferencedAssemblies.Add("CodeMaker.DALFactory.dll");
             objCompilerParameters.ReferencedAssemblies.Add("CodeMaker.IDAL.dll");
             objCompilerParameters.ReferencedAssemblies.Add("CodeMaker.Model.dll");
             objCompilerParameters.ReferencedAssemblies.Add("CodeMaker.MySqlDAL.dll");
             objCompilerParameters.ReferencedAssemblies.Add("CodeMaker.SqlDAL.dll");
             objCompilerParameters.ReferencedAssemblies.Add("CodeMaker.Engine.dll");
             objCompilerParameters.GenerateExecutable = false;
             objCompilerParameters.GenerateInMemory = true;

             // CompilerResults
             CompilerResults cr = provider.CompileAssemblyFromSource(objCompilerParameters, strCode);

             if (cr.Errors.HasErrors)
             {
                 Console.WriteLine("编译错误：");
                 foreach (CompilerError err in cr.Errors)
                 {
                     strResults.Append(err.ErrorText);
                     strResults.Append(Environment.NewLine);
                     strResults.Append(err.Line);
                     strResults.Append(Environment.NewLine);
                     strResults.Append(err.ToString());
                     strResults.Append(Environment.NewLine);

                 }
             }
             else
             {
                 // 通过反射，调用OutPut的输出方法
                 Assembly objAssembly = cr.CompiledAssembly;
                 object objHelloWorld = objAssembly.CreateInstance("DynamicCodeGenerate.CodeGenerate");
                 MethodInfo objMI = objHelloWorld.GetType().GetMethod("OutPut");

                 strResults.Append(objMI.Invoke(objHelloWorld, null));
                 strResults.Append(Environment.NewLine);

             }

             return strResults.ToString();
         }

         public static string DoCodeMakerCompile(string strDBType,string DALAssemblyPath, string strDataBase,string strTableName, string strEntityName,string strCode)
         {

             StringBuilder sb = new StringBuilder();
             //加上要编译部分代码的头部和尾部
             //头部
             sb.Append("using System;");
             sb.Append("using System.Data;");
             sb.Append("using System.Text;");
             sb.Append("using System.Linq;");
             sb.Append("using System.Globalization;");
             sb.Append("using System.Collections.Generic;");
             sb.Append("using CodeMaker.Model;");
             sb.Append("using CodeMaker.BLL;");
             sb.Append("using CodeMaker.Engine;");
             sb.Append("namespace DynamicCodeGenerate");
             sb.Append("{");

             sb.Append("   public class CodeGenerate");
             sb.Append("   {");
             sb.Append("        public string OutPut()");
             sb.Append("        {");

             //读取数据实体的属性的代码段
             sb.Append(GetEntity(strDBType, DALAssemblyPath, strDataBase, strTableName, strEntityName));

             sb.Append(strCode);

             //返回值，字符串
             sb.Append("         return s.ToString(); ");
             sb.Append("        }");
             //fOutPut方法结束
             //首字母大写方法
             sb.Append("        public string ToTitleCase(string str)");
             sb.Append("        {");
             sb.Append("          return str.Substring(0,1).ToUpper()+str.Substring(1);");
             sb.Append("        }");
             //首字母小写方法
             sb.Append("        public string ToLowerCase(string str)");
             sb.Append("        {");
             sb.Append("          return str.Substring(0,1).ToLower()+str.Substring(1);");
             sb.Append("        }");

             sb.Append("   }");
             sb.Append("}");

             return DoCompile(sb.ToString());
         }

         private static string GetEntity(string strDBType, string DALAssemblyPath, string strDataBase, string strTableName, string strEntityName)
         {
             StringBuilder sb = new StringBuilder();
             sb.Append("CodeMaker.BLL.EntityBLL bll = new CodeMaker.BLL.EntityBLL(\"" + DALAssemblyPath + "\");");
             sb.Append("IList<CodeMaker.Model.Entity> es = bll.GetEntityList(\"" + strDataBase + "\", \"" + strTableName + "\");");
             sb.Append("string EntityName=\"" + strEntityName + "\";");//实体名，供模板中的代码段使用
             sb.Append("string TableName=\"" + strTableName + "\";");//表名，供模板中的代码段使用
             sb.Append("string DBType=\"" + strDBType + "\";");//数据库组件，判断数据库种类SQLSERVER，MYSQL，供模板中的代码段使用
             sb.Append("string TablePri=(es.Where(x=>x.IsPri==\"YES\").Count()>0)?es.Where(x=>x.IsPri==\"YES\").ToList()[0].ColumnName:\"\";");//表的主键列 名称
             sb.Append("string TablePriDataType=(es.Where(x=>x.IsPri==\"YES\").Count()>0)?CodeAnalysis.ToDataTypeFormat(es.Where(x=>x.IsPri==\"YES\").ToList()[0].DataType,DBType):\"\";");//表的主键列 数据类型
             return sb.ToString();

         }

         public static string GenerateCode()
         {
             return "";
         }
     }
 }

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Text.RegularExpressions;

 namespace CodeMaker.Engine
 {
     public class CodeAnalysis
     {
         public static string Hello()
         {
             return "Hello";
         }

         public static string ToCSharpCode(string strContent)
         {
             StringBuilder sb = new StringBuilder();
             //需要逐行解析
             string[] ss = strContent.Split('\n');
             string strT=string.Empty;
             if (ss.Length > )
             {
                 sb.Append("StringBuilder s = new StringBuilder();");//如果行数不为0，则需要声明字符串拼接
                 sb.Append(System.Environment.NewLine);
             }
             for (int i = ; i < ss.Length; i++)
             {
                 //处理字符串行
                 sb.Append(DealCode(ss[i]));
                 sb.Append(System.Environment.NewLine);

             }

             return sb.ToString();
         }

         /// <summary>
         /// 单行字符串处理
         /// </summary>
         /// <param name="strLine"></param>
         /// <returns></returns>
         private static string DealCode(string strLine)
         {
             //判断当该行是无特殊代码行。特殊代码（<-$、$->）

             strLine = Regex.Replace(strLine, @"[\r\n]", "");  //替换掉常量中的换行符

             if (strLine.Contains("<-$") && strLine.Contains("$->"))
             {
                 //有整行特殊代码段
                 //strLine = strLine.Replace("\"", "\\\"");
                 strLine = strLine.Replace("<-$", "");
                 strLine = strLine.Replace("$->", "");

                 //strLine += "s.Append(System.Environment.NewLine);";
             }
             else if (strLine.Contains("<+$") && strLine.Contains("$+>"))
             {
                 //有变量取值代码段
                 strLine = strLine.Replace("\"", "\\\"");
                 strLine = "\""+strLine+"\\n\"";//前后先加引号,后面加个换行
                 strLine = strLine.Replace("<+$", "\"+");
                 strLine = strLine.Replace("$+>", "+\"");

                 strLine = "s.Append("+ strLine +");";
             }
             else
             {
                 //不是特殊代码行
                 //strLine = "s.Append(\"" + strLine + "\"); s.Append(System.Environment.NewLine);" ;
                 strLine = strLine.Replace("\"", "\\\"");
                 strLine = "s.Append(\"" + strLine + "\\n\");";
             }

             return strLine;
         }

         #region 供动态编译的代码段中调用的静态方法

         /// <summary>
         /// 数据库字段数据类型 转为 java语言中的数据类型
         /// </summary>
         /// <param name="strDBColumnType">数据库字段数据类型</param>
         /// <param name="strDBType">数据库MYSQL  SQLSERVER</param>
         /// <returns></returns>
         public static string ToJavaDataType(string strDBColumnType, string strDBType)
         {
             string strT = string.Empty;

             //根据strDBType 判断数据库是什么，然后转换为程序语言中的数据类型
             switch (strDBType)
             {
                 case "SQLSERVER":
                     var stringwords = new string[]{"char","varchar","text","nchar","nvarchar","ntext"};
                     var intwords = new string[]{"int","smallint","tinyint"};
                     var boolwords = new string[] { "bit"};
                     var longwords = new string[] { "bigint"};
                     var decimalwords = new string[] { "numeric", "decimal", "money","smallmoney","float","real" };
                     var datewords = new string[] { "datetime", "smalldatetime" };
                     if (stringwords.Contains(strDBColumnType.ToLower()))
                     {
                         strT="String";
                     }
                     else if (intwords.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "int";
                     }
                     else if (longwords.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "long";
                     }
                     else if (boolwords.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "boolean";
                     }
                     else if (decimalwords.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "decimal";
                     }
                     else if (datewords.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "DateTime";
                     }
                     else
                     {
                         strT = "String";
                     }

                     break;

                 case "MYSQL":
                      var stringwords1 = new string[]{"char","varchar","text","tinytext","mediumtext","longtext"};
                     var intwords1 = new string[]{"smallint","tinyint","mediumint"};
                     var boolwords1 = new string[] { "bit"};
                     var longwords1 = new string[] { "int,bigint", "integer" };
                     var decimalwords1 = new string[] { "float", "decimal", "double" };
                     var datewords1 = new string[] { "datetime", "date" };
                     if (stringwords1.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "String";
                     }
                     else if (intwords1.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "int";
                     }
                     else if (longwords1.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "long";
                     }
                     else if (boolwords1.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "boolean";
                     }
                     else if (decimalwords1.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "decimal";
                     }
                     else if (datewords1.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "DateTime";
                     }
                     else
                     {
                         strT = "String";
                     }

                     break;

                 default:
                     break;
             }

             return strT;
         }

         /// <summary>
         /// 数据库字段数据类型 转为 c# 语言中的数据类型
         /// </summary>
         /// <param name="strDBColumnType">数据库字段数据类型</param>
         /// <param name="strDBType">数据库MYSQL  SQLSERVER</param>
         /// <returns></returns>
         public static string ToCSDataType(string strDBColumnType, string strDBType)
         {
             string strT = string.Empty;

             //根据strDBType 判断数据库是什么，然后转换为程序语言中的数据类型
             switch (strDBType)
             {
                 case "SQLSERVER":
                     var stringwords = new string[]{"char","varchar","text","nchar","nvarchar","ntext"};
                     var intwords = new string[]{"int","smallint","tinyint"};
                     var boolwords = new string[] { "bit"};
                     var longwords = new string[] { "bigint"};
                     var decimalwords = new string[] { "numeric", "decimal", "money","smallmoney","float","real" };
                     var datewords = new string[] { "datetime", "smalldatetime" };
                     if (stringwords.Contains(strDBColumnType.ToLower()))
                     {
                         strT="string";
                     }
                     else if (intwords.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "int";
                     }
                     else if (longwords.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "long";
                     }
                     else if (boolwords.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "bool";
                     }
                     else if (decimalwords.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "decimal";
                     }
                     else if (datewords.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "DateTime";
                     }
                     else
                     {
                         strT = "string";
                     }

                     break;

                 case "MYSQL":
                      var stringwords1 = new string[]{"char","varchar","text","tinytext","mediumtext","longtext"};
                     var intwords1 = new string[]{"smallint","tinyint","mediumint"};
                     var boolwords1 = new string[] { "bit"};
                     var longwords1 = new string[] { "int,bigint", "integer" };
                     var decimalwords1 = new string[] { "float", "decimal", "double" };
                     var datewords1 = new string[] { "datetime", "date" };
                     if (stringwords1.Contains(strDBColumnType.ToLower()))
                     {
                         strT="string";
                     }
                     else if (intwords1.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "int";
                     }
                     else if (longwords1.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "long";
                     }
                     else if (boolwords1.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "bool";
                     }
                     else if (decimalwords1.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "decimal";
                     }
                     else if (datewords1.Contains(strDBColumnType.ToLower()))
                     {
                         strT = "DateTime";
                     }
                     else
                     {
                         strT = "string";
                     }

                     break;

                 default:
                     break;
             }

             return strT;
         }

         /// <summary>
         /// 把小写的sqlserver数据库中的数据类型转为sqlserver参数格式，例如 SqlDbType.VarChar
         /// </summary>
         /// <param name="strDataType"></param>
         /// <param name="strDBType">数据库MYSQL  SQLSERVER</param>
         /// <returns></returns>
         public static string ToDataTypeFormat(string strDataType,string strDBType)
         {
             string strT = string.Empty;
             switch (strDataType.ToLower())
             {
                 case "int":
                     strT = "Int";
                     break;
                 case "varchar":
                     strT = "VarChar";
                     break;
                 case "char":
                     strT = "Char";
                     break;
                 case "bigint":
                     strT = "BigInt";
                     break;
                 case "nvarchar":
                     strT = "NVarChar";
                     break;
                 case "datetime":
                     strT = "DateTime";
                     break;
                 case "smalldatetime":
                     strT = "SmallDateTime";
                     break;
                 case "bit":
                     strT = "Bit";
                     break;
                 case "text":
                     strT = "Text";

                     break;
                     case "decimal":
                     strT = "Decimal";
                     break;
                     case "ntext":
                     strT = "NText";
                     break;
                 default:
                     strT = "VarChar";
                     break;
             }

             return strT;
         }

         /// <summary>
         /// 获取数据类型或控件的简写，用于前缀命名
         /// </summary>
         /// <param name="strLongName"></param>
         /// <returns></returns>
         public static string ToNameFormat(string strLongName)
         {
             string strT = string.Empty;
             switch (strLongName.ToLower())
             {
                 case "int":
                     strT = "int";
                     break;
                 case "string":
                     strT = "str";
                     break;
                 case "char":
                     strT = "ch";
                     break;
                 case "long":
                     strT = "long";
                     break;
                 case "float":
                     strT = "float";
                     break;
                 case "datetime":
                     strT = "date";
                     break;
                 case "double":
                     strT = "double";
                     break;
                 case "bool":
                     strT = "Is";
                     break;
                 case "decimal":
                     strT = "dec";
                     break;
                 case "boolean":
                     strT = "Is";
                     break;
                 default:
                     strT = "x";
                     break;
             }

             return strT;
         }
         #endregion
     }
 }

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有位博友提到过T4模板，我也看了一点点，但是我考虑的是不单单生成c#代码，目标代码还要java，因为目前正在转java方向。为了灵活性，我觉得自己定义规则比较放心，也许这个想法不成熟，但是先试试吧

下载链接

http://www.cnblogs.com/allanyang/p/4702467.html