T4学习- 2、T4代码生成器-Kalman Studio

一、简介

开源代码生成器-Kalman Studio

https://github.com/loamen/Kalman.Studio

image

1、软件主要功能如下:

1、基于T4的代码生成工具,根据数据库元数据信息生成代码,支持多数据库,支持批量代码生成;
2、支持根据PowerDesigner物理模型文件来生成代码;
3、内置了一个简单的文本编辑器,支持代码高亮显示;
4、数据库元数据信息浏览工具;
5、数据库文档生成工具,支持输出word及pdf文件格式;
6、IIS日志解析器,小网站可以用用;
7、其他工具,字符串相关操作等。

二、编写T4模板:

1、VS自动根据模板自动生成代码

首先,打开Visual Studio,新建一个文本文件,将扩展名改为"tt"
o_new<span data-type=[1]" />

这时Visual Studio会为Entity.tt生成一个对应的类文件Entity.cs。这是因为Visual
Studio内置了一个代码生成工具“TextTemplatingFileGenerator”,会自动为每个模板文件生成对应的类文件,如果你在Entity.tt中编辑好模板,然后打开Entity.cs,TextTemplatingFileGenerator会自动解析模板,将代码输出到文件Entity.cs。

o_TextTemplatingFileGenerator<span data-type=[1]" />

2、编写T4模板

我们这里不需要使用TextTemplatingFileGenerator生成代码,把属性面板,“自定义工具”里面的文字“TextTemplatingFileGenerator”删掉,对应的类文件会自动删除;然后可以开始编写模板了。

我这里先展示一个编写好的实体模板,然后再详细说明。

<#@ template language="C#v3.5" hostSpecific="true" debug="true" #>
<#@ output extension=".cs" #>
<# 
    TableHost host = (TableHost)(Host); 
    SOTable table = host.Table;
    List<SOColumn> list = host.ColumnList;
    string columnPrefix = host.GetString("ColumnPrefix");
    int prefixLevel = host.GetInt32("PrefixLevel");
    string nameSpace = host.GetString("NameSpace");
    string className = host.GetString("ClassName");
    if(string.IsNullOrEmpty(nameSpace))nameSpace = "Entity";
    if(string.IsNullOrEmpty(className))className = table.Name;
#>
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;

namespace <#= nameSpace #>
{
    /// <summary>
    /// <#= table.Comment == "" ? table.Name : table.Comment #>
    /// </summary>
    [Serializable]
    public partial class <#= className #>
    {
        <# foreach (SOColumn c in list)
        { #>/// <summary>
        /// <#= c.Comment == "" ? c.Name : c.Comment #>
        /// </summary>
        public <#= TypeUtil.DbType2TypeString(c.DataType) #> <#= StringUtil.RemovePrefix(c.Name, columnPrefix, prefixLevel).Replace(" ", "") #> { get; set; }
        
        <# } #>
        
    }
}

3、T4模板语法

  • <#@ template language="C#v3.5" hostSpecific="true" debug="true" #>:可以指定模板使用的语言,hostSpecific="true"表示是否使用特定的host(Kalman Studio里面使用的是TableHost对象,必须实现接口ITextTemplatingEngineHost)。
  • <#@ output extension=".cs" #> : 指定生成文件的扩展名。
  • <#@ assembly name="System.Data" #>:添加程序集引用,如果要使用第三方程序集,那么最好在项目中添加引用,或者加入到GAC。
  • <#@ import namespace="System.Data" #>:导入要使用的命名空间,注意:这里的命名空间必须要在前面指定的程序集里面找得到的,比如我指定命名空间"System.Data","System.Data.Common",这些在程序集System.Data中都有的。
  • <#@ include file="test.tt" #> 导入模板,类似Html的include用法
  • <# #>:定义代码块
  • <#= #>:定义表达式
  • <#+ #>:定义变量

三、Kalman Studio改进

1、自定义架构对象SchemaObject下的类。

2、自定义T4模板的引擎主机类:T4TemplatingEngineHost

3、自定义SqlServerSchema

image

更改Kalman项目的SqlServerSchema文件,增加Computed是否是计算字段的判断。

 public override List<SOColumn> GetTableColumnList(SOTable table)
        {
            string cmdText = string.Format(@"use [{2}];select   colm.name column_name, object_definition(colm.default_object_id) as column_def, systype.name type_name, colm.is_identity, colm.is_nullable ,
                                                        cast(colm.max_length as int) length, cast(colm.precision as int) precision, cast(colm.scale as int) scale, colm.is_computed
                                            from     sys.columns colm
                                                inner join sys.types systype on colm.system_type_id = systype.system_type_id and colm.user_type_id = systype.user_type_id
                                            where    colm.object_id = object_id('{0}')
                                            order by colm.column_id;", table.Name, table.Owner, table.Database.Name);

            List<SOColumn> columnList = new List<SOColumn>();
            List<string> pkList = GetPrimaryKeys(table);
            DataTable dt = this.DbProvider.ExecuteDataSet(System.Data.CommandType.Text, cmdText).Tables[0];

            foreach (DataRow row in dt.Rows)
            {
                SOColumn column = new SOColumn
                {
                    Parent = table,
                    Name = row["column_name"].ToString(),
                    DefaultValue = row["column_def"].ToString(),
                    Nullable = row["is_nullable"].ToString()== "True",
                    NativeType = row["type_name"].ToString(),
                    Identify = row["is_identity"].ToString() == "True",
                    Computed = row["is_computed"].ToString() == "True",
                    //ForeignKey
                    Length = ConvertUtil.ToInt32(row["length"], -1),
                    Precision = ConvertUtil.ToInt32(row["precision"], -1),
                    Scale = ConvertUtil.ToInt32(row["scale"], –1),
                };

                column.PrimaryKey = pkList.Contains(column.Name);
                column.DataType = this.GetDbType(column.NativeType);
                column.Comment = GetColumnComment(column);
                columnList.Add(column);
            }

            return columnList;
        }

4、常用的几个自定义的T4模板

1、生成实体:model.tt

<#@ template language="C#v3.5" hostSpecific="true" debug="true" #>
<#@ output extension=".cs" #>
<#
    TableHost host = (TableHost)(Host);
    SOTable table = host.Table;
    List`<SOColumn>` list = host.ColumnList;
    string nameSpace = host.GetString("NameSpace");
    string className = host.GetString("ClassName");
    if(string.IsNullOrEmpty(nameSpace))nameSpace = "Entity";
    if(string.IsNullOrEmpty(className))className = table.Name;
#>
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;

namespace <#= nameSpace #>
{
    ///`<summary>`
    /// <#= table.Comment == "" ? table.Name : table.Comment.Replace("\r\n"," ") #>
    /// `</summary>`
    [Serializable]
    public partial class <#= className+"Entity" #>
    {
<# foreach (SOColumn c in list)
{#>
        /// `<summary>`
        /// <#= c.Comment == "" ? c.Name : c.Comment.Replace("\r\n"," ") #>
        /// `</summary>`
        public <#= TypeUtil.DbType2TypeString(c.DataType) #><# if(c.Nullable) {  #><#if(TypeUtil.DbType2Type(c.DataType).IsValueType){ #>?<#
 }#><# }#> <#= c.Name #>{get;set;};

<# } #>
    }
}

2、生成数据访问层:DAL.tt

<#@ template language="C#v3.5" hostSpecific="true" debug="true" #><#@ output extension=".cs" #>
<#
    TableHost host = (TableHost)(Host);
    SOTable table = host.Table;
    List`<SOColumn>` list = host.ColumnList;

string nameSpace = host.GetString("NameSpace");
    string className = host.GetString("ClassName");
    if(string.IsNullOrEmpty(nameSpace))nameSpace = "DAL";
    if(string.IsNullOrEmpty(className))className = table.Name;
    List`<SOColumn>` listPK = new List`<SOColumn>`();
    List`<SOColumn>` listOtherCol =new List`<SOColumn>`();

List`<string>` listAdd =new List`<string>`();
    List`<string>` listUpdate =new List`<string>`();
    foreach (SOColumn c in list)
    {
if(c.PrimaryKey)
      {
          listPK.Add(c);
      }
      if((c.PrimaryKey&&!c.Identify) ||!c.PrimaryKey )
        {
if( !c.Computed)
         {
listOtherCol.Add(c);
             listAdd.Add("+\",\" + SqlNull(entity." + c.Name + ")");
             if(!c.PrimaryKey)
                  listUpdate.Add("+ \","+ c.Name + "=\"+ SqlNull(entity." + c.Name + ")");
        }
}}

//colAll
System.Text.StringBuilder sbcolAllStr = new StringBuilder();
     List`<string>` list1= list.ConvertAll(p=>p.Name);
    for (int i = 0; i < list1.Count; i++)
    {
        sbcolAllStr.Append("t."+list[i] + ",");
        if ((i + 1) % 5 == 0 && (i + 1)!=list1.Count ) sbcolAllStr.Append("\r\n                                         ");
    }
    string colAllStr = sbcolAllStr.ToString().TrimEnd(',');

//colOtherStr
    System.Text.StringBuilder sbcolOtherStr = new StringBuilder();
    List`<string>` list2= listOtherCol.ConvertAll(p=>p.Name);
    for (int i = 0; i < list2.Count; i++)
    {
       if(list2[i].IndexOf("UpdateUser")>-1||list2[i].IndexOf("UpdateTime")>-1)
            continue;
        sbcolOtherStr.Append(list2[i] + ",");
        if ((i + 1) % 5 == 0  && (i + 1)!=list2.Count) sbcolOtherStr.Append("\r\n                                         ");
    }
    string colOtherStr =  sbcolOtherStr.ToString().TrimEnd(',');

//AddStr
    System.Text.StringBuilder sblistAddStr = new StringBuilder();
    for (int i = 0; i < listAdd.Count; i++)
    {
           if(listAdd[i].IndexOf("UpdateUser")>-1||listAdd[i].IndexOf("UpdateTime")>-1)
            continue;
        sblistAddStr.Append(listAdd[i] + "");
        if ((i + 1) % 5 == 0  && (i + 1)!=listAdd.Count) sblistAddStr.Append("\r\n                                         ");
    }
    string listAddStr = System.Text.RegularExpressions.Regex.Replace(sblistAddStr.ToString(), @"^\+\s*"",""\s", "");

//UpdateStr
    System.Text.StringBuilder sblistUpdateStr = new StringBuilder();
    for (int i = 0; i < listUpdate.Count; i++)
    {
           if(listUpdate[i].IndexOf("CreateUser")>-1||listUpdate[i].IndexOf("CreateTime")>-1)
            continue;
        sblistUpdateStr.Append(listUpdate[i] + "");
        if ((i + 1) % 5 == 0  && (i + 1)!=listUpdate.Count) sblistUpdateStr.Append("\r\n                                         ");
    }
    string listUpdateStr = System.Text.RegularExpressions.Regex.Replace(sblistUpdateStr.ToString(), @"^\+\s*"",", "+ \"");

#>
using System;
using System.Collections.Generic;
using System.Data;
using ZS.Mix.Common;
using <#= className #>.Entity;

namespace <#= nameSpace #>
{
    internal class <#= className+"DAL" #> : BaseDAL
    {
        ///`<summary>`
        /// 分页获取所有记录
        /// `</summary>`
        public List<<#= className #>Entity>  GetAll(<#= TypeUtil.DbType2TypeString(listPK[0].DataType) #> <#= listPK[0].Name #>, int pageindex, int pagesize)
        {
            string sql = string.Format(@"select <#=colAllStr #>
from   <#= table.Database.Name + "." + table.SchemaName + "." + table.Name #> t
                                         where  t.<#= listPK[0].Name #>  like '%' + '{0}' + '%'
                                         order by  t.<#= listPK[0].Name #> offset ( {1} - 1 ) * {2} rows fetch next {2} rows only;", <#= listPK[0].Name #>, pageindex, pagesize);
            return Service.SqlTable(sql).ToList<<#= className+"Entity" #>>();
         }

///`<summary>`
        /// 获取记录总数
        /// `</summary>`
        public  int GetCount(<#= TypeUtil.DbType2TypeString(listPK[0].DataType) #> <#= listPK[0].Name #>)
        {
            string sql = string.Format(@"select count(1)
from <#= table.Database.Name + "." + table.SchemaName + "." + table.Name #> t
                                         where  <#= listPK[0].Name #> like '%' + '{0}' + '%';", <#= listPK[0].Name #>);
            return Convert.ToInt32(Service.SqlValueList(sql));
        }

///`<summary>`
        /// 获取简要记录
        /// `</summary>`
        public List<<#= className #>Entity> Get<#= className #>List (<#= TypeUtil.DbType2TypeString(listPK[0].DataType) #> <#= listPK[0].Name #> = "%")
        {
            string sql = string.Format(@"select  <#=colAllStr #>
from  <#= table.Database.Name + "." + table.SchemaName + "." + table.Name #> t
                                         where t.<#= listPK[0].Name #> like '%' + '{0}' + '%'
                                         order by t.<#= listPK[0].Name #>", <#= listPK[0].Name #>);
            return Service.SqlTable(sql).ToList<<#= className+"Entity" #>>();
        }

///`<summary>`
        /// 获取单个实体
        /// `</summary>`
        public  <#= className #>Entity Get<#= className #> (<#= TypeUtil.DbType2TypeString(listPK[0].DataType) #> <#= listPK[0].Name #>)
        {
            string sql = string.Format(@" select <#=colAllStr #>
from <#= table.Database.Name + "." + table.SchemaName + "." + table.Name #> t
                                          where  t.<#= listPK[0].Name #> like '%' + '{0}' + '%';", <#= listPK[0].Name #>);

return Service.SqlTable(sql).ToList<<#= className+"Entity" #>>()[0];
        }

///`<summary>`
        /// 是否存在该记录
        /// `</summary>`
        public bool Exists(<#= TypeUtil.DbType2TypeString(listPK[0].DataType) #> <#= listPK[0].Name #>)
        {
            string sql = string.Format(@"declare @TempID int;SELECT @TempID = count(1)
                                          from <#= table.Database.Name + "." + table.SchemaName + "." + table.Name #> t
                                         where <#= listPK[0].Name #> = '{0}';
                                        if @TempID = 0
                                            select 0;
                                        else
                                            select  1;", <#= listPK[0].Name #>);

int result = Convert.ToInt32(Service.SqlValueList(sql));
            return result == 1 ? true : false;
        }
        ///`<summary>`
        ///  增加一条数据
        /// `</summary>`
        public bool Add(<#= className #>Entity entity)
        {
            string sql = @"INSERT INTO <#= table.Database.Name + "." + table.SchemaName + "." + table.Name #>(
                                         <#= colOtherStr #>
)VALUES("
                                           <#= listAddStr #>
+ " ) ;";

int rowsAffected = Service.SqlExecute(sql);
            return rowsAffected == 1 ? true : false;
        }

///`<summary>`
        ///  更新一条数据
        /// `</summary>`
        public bool Update(<#= className #>Entity entity)
        {
            string sql = @"UPDATE <#= table.Database.Name + "." + table.SchemaName + "." + table.Name #> SET "
                                         <#= listUpdateStr #>
                          + " WHERE <#=listPK[0].Name #>= '" + <#= "entity."+listPK[0].Name #> +"';";

int rowsAffected = Service.SqlExecute(sql);
            return rowsAffected == 1 ? true : false;
        }

///`<summary>`
        /// 删除一条数据
        /// `</summary>`
        public bool Delete(<#= TypeUtil.DbType2TypeString(listPK[0].DataType) #> <#= listPK[0].Name #>)
        {
            string sql = string.Format(@"DELETE <#= table.Database.Name + "." + table.SchemaName + "." + table.Name #>
                                         WHERE <#= listPK[0].Name #>='{0}';", <#= listPK[0].Name #>);

int rowsAffected = Service.SqlExecute(sql);
            return rowsAffected == 1 ? true : false;
        }
}

3、注意这个处理null值的函数:

static public object SqlNull(dynamic obj)
{
    if (obj == null)
    {
        return "null";
    }

string typename = obj.GetType().Name.Equals("Nullable`1") ? obj.GetType().GetGenericArguments()[0].ToString() : obj.GetType().ToString();

if (typename.Equals("System.String") || typename.Equals("System.Boolean"))
    {
        return "'" + obj.ToString() + "'";
    }
    else if (typename.Equals("System.DateTime"))
    {
        return "convert(datetime,'" + obj.ToString() + "') ";
    }
    else
    {
        return obj.ToString();
    }
}

更改后的码云地址:

https://gitee.com/yangbobin/Kalman.Studio

posted on 2022-05-11 14:01  springsnow  阅读(109)  评论(0编辑  收藏  举报

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