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('
');
            string strT=string.Empty;
            if (ss.Length > 0)
            {
                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 = 0; 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, @"[
]", "");  //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
    }
}

 --------------------------------------------------------------------------

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