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
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"
[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。
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
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:
posted on 2022-05-11 14:01 springsnow 阅读(111) 评论(0) 编辑 收藏 举报