T4模板使用記錄，生成Model、Service、Repository
本身目前在搭建一個.NET Core的框架，原本是打算使用前端作代碼生成器直接生成到文件的，快作好了。感受好像使用T4更方便一些，因此也就有了這篇文章~ html
我仍是有個問題沒解決，就是我想生成每一個類（接口）單獨的文件~，若是有老師知道指點下啊~前端
在網上找了一篇相關文章 本文也是基於這個作了一下本身的修改。web
首先公共程序集建立一個DbHelper.ttincludesql
主要就是連接數據庫，搜索數據庫表及表中字段的信息。數據庫
你能夠獲得這樣的結果：瞬間明瞭了，而後就 愛的魔力轉圈圈~ 循環就行了！架構
代碼是這樣的：框架
<#+
public class config
{
public static readonly string ConnectionString="Data Source=(local);Integrated Security=true;Initial Catalog=LJDAPP;";
public static readonly string DbDatabase="LJDAPP";
}
public class DbHelper
{
public static List<DbTable> GetDbTables(string connectionString, string database)
{
string sql = string.Format(@"SELECT
obj.name tablename,
schem.name schemname,
ISNULL(g.value,'') [description],
idx.rows,
CAST
(
CASE
WHEN (SELECT COUNT(1) FROM sys.indexes WHERE object_id= obj.OBJECT_ID AND is_primary_key=1) >=1 THEN 1
ELSE 0
END
AS BIT) HasPrimaryKey
from {0}.sys.objects obj
inner join {0}.dbo.sysindexes idx on obj.object_id=idx.id and idx.indid<=1
INNER JOIN {0}.sys.schemas schem ON obj.schema_id=schem.schema_id
left join {0}.sys.extended_properties g ON (obj.object_id = g.major_id AND g.minor_id = 0 AND g.name= 'MS_Description')
where type='U'
order by obj.name", database);
DataTable dt = GetDataTable(connectionString, sql);
return dt.Rows.Cast<DataRow>().Select(row => new DbTable
{
TableName = row.Field<string>("tablename"),
SchemaName = row.Field<string>("schemname"),
Description=row.Field<string>("description"),
Rows = row.Field<int>("rows"),
HasPrimaryKey = row.Field<bool>("HasPrimaryKey")
}).ToList();
}
public static List<DbColumn> GetDbColumns(string connectionString, string database, string tableName, string schema = "dbo")
{
string sql = string.Format(@"
WITH indexCTE AS
(
SELECT
ic.column_id,
ic.index_column_id,
ic.object_id
FROM {0}.sys.indexes idx
INNER JOIN {0}.sys.index_columns ic ON idx.index_id = ic.index_id AND idx.object_id = ic.object_id
WHERE idx.object_id =OBJECT_ID(@tableName) AND idx.is_primary_key=1
)
select
colm.column_id ColumnID,
CAST(CASE WHEN indexCTE.column_id IS NULL THEN 0 ELSE 1 END AS BIT) IsPrimaryKey,
colm.name ColumnName,
systype.name ColumnType,
colm.is_identity IsIdentity,
colm.is_nullable IsNullable,
cast(colm.max_length as int) ByteLength,
(
case
when systype.name='nvarchar' and colm.max_length>0 then colm.max_length/2
when systype.name='nchar' and colm.max_length>0 then colm.max_length/2
when systype.name='ntext' and colm.max_length>0 then colm.max_length/2
else colm.max_length
end
) CharLength,
cast(colm.precision as int) Precision,
cast(colm.scale as int) Scale,
prop.value Remark
from {0}.sys.columns colm
inner join {0}.sys.types systype on colm.system_type_id=systype.system_type_id and colm.user_type_id=systype.user_type_id
left join {0}.sys.extended_properties prop on colm.object_id=prop.major_id and colm.column_id=prop.minor_id
LEFT JOIN indexCTE ON colm.column_id=indexCTE.column_id AND colm.object_id=indexCTE.object_id
where colm.object_id=OBJECT_ID(@tableName)
order by colm.column_id", database);
SqlParameter param = new SqlParameter("@tableName", SqlDbType.NVarChar, 100) { Value = string.Format("{0}.{1}.{2}", database, schema, tableName) };
DataTable dt = GetDataTable(connectionString, sql, param);
return dt.Rows.Cast<DataRow>().Select(row => new DbColumn()
{
ColumnID = row.Field<int>("ColumnID"),
IsPrimaryKey = row.Field<bool>("IsPrimaryKey"),
ColumnName = row.Field<string>("ColumnName"),
ColumnType = row.Field<string>("ColumnType"),
IsIdentity = row.Field<bool>("IsIdentity"),
IsNullable = row.Field<bool>("IsNullable"),
ByteLength = row.Field<int>("ByteLength"),
CharLength = row.Field<int>("CharLength"),
Scale = row.Field<int>("Scale"),
Remark = row["Remark"].ToString()
}).ToList();
}
public static DataTable GetDataTable(string connectionString, string commandText, params SqlParameter[] parms)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand command = connection.CreateCommand();
command.CommandText = commandText;
command.Parameters.AddRange(parms);
SqlDataAdapter adapter = new SqlDataAdapter(command);
DataTable dt = new DataTable();
adapter.Fill(dt);
return dt;
}
}
}
/// <summary>
/// 表結構
/// </summary>
public sealed class DbTable
{
/// <summary>
/// 表名稱
/// </summary>
public string TableName { get; set; }
/// <summary>
/// 表的架構
/// </summary>
public string SchemaName { get; set; }
/// <summary>
/// 表的說明
/// </summary>
public string Description { get; set; }
/// <summary>
/// 表的記錄數
/// </summary>
public int Rows { get; set; }
/// <summary>
/// 是否含有主鍵
/// </summary>
public bool HasPrimaryKey { get; set; }
}
/// <summary>
/// 表字段結構
/// </summary>
public sealed class DbColumn
{
/// <summary>
/// 字段ID
/// </summary>
public int ColumnID { get; set; }
/// <summary>
/// 是否主鍵
/// </summary>
public bool IsPrimaryKey { get; set; }
/// <summary>
/// 字段名稱
/// </summary>
public string ColumnName { get; set; }
/// <summary>
/// 字段類型
/// </summary>
public string ColumnType { get; set; }
/// <summary>
/// 數據庫類型對應的C#類型
/// </summary>
public string CSharpType
{
get
{
return SqlServerDbTypeMap.MapCsharpType(ColumnType);
}
}
/// <summary>
///
/// </summary>
public Type CommonType
{
get
{
return SqlServerDbTypeMap.MapCommonType(ColumnType);
}
}
/// <summary>
/// 字節長度
/// </summary>
public int ByteLength { get; set; }
/// <summary>
/// 字符長度
/// </summary>
public int CharLength { get; set; }
/// <summary>
/// 小數位
/// </summary>
public int Scale { get; set; }
/// <summary>
/// 是否自增列
/// </summary>
public bool IsIdentity { get; set; }
/// <summary>
/// 是否容許空
/// </summary>
public bool IsNullable { get; set; }
/// <summary>
/// 描述
/// </summary>
public string Remark { get; set; }
}
public class SqlServerDbTypeMap
{
public static string MapCsharpType(string dbtype)
{
if (string.IsNullOrEmpty(dbtype)) return dbtype;
dbtype = dbtype.ToLower();
string csharpType = "object";
switch (dbtype)
{
case "bigint": csharpType = "long"; break;
case "binary": csharpType = "byte[]"; break;
case "bit": csharpType = "bool"; break;
case "char": csharpType = "string"; break;
case "date": csharpType = "DateTime"; break;
case "datetime": csharpType = "DateTime"; break;
case "datetime2": csharpType = "DateTime"; break;
case "datetimeoffset": csharpType = "DateTimeOffset"; break;
case "decimal": csharpType = "decimal"; break;
case "float": csharpType = "double"; break;
case "image": csharpType = "byte[]"; break;
case "int": csharpType = "int"; break;
case "money": csharpType = "decimal"; break;
case "nchar": csharpType = "string"; break;
case "ntext": csharpType = "string"; break;
case "numeric": csharpType = "decimal"; break;
case "nvarchar": csharpType = "string"; break;
case "real": csharpType = "Single"; break;
case "smalldatetime": csharpType = "DateTime"; break;
case "smallint": csharpType = "short"; break;
case "smallmoney": csharpType = "decimal"; break;
case "sql_variant": csharpType = "object"; break;
case "sysname": csharpType = "object"; break;
case "text": csharpType = "string"; break;
case "time": csharpType = "TimeSpan"; break;
case "timestamp": csharpType = "byte[]"; break;
case "tinyint": csharpType = "byte"; break;
case "uniqueidentifier": csharpType = "Guid"; break;
case "varbinary": csharpType = "byte[]"; break;
case "varchar": csharpType = "string"; break;
case "xml": csharpType = "string"; break;
default: csharpType = "object"; break;
}
return csharpType;
}
public static Type MapCommonType(string dbtype)
{
if (string.IsNullOrEmpty(dbtype)) return Type.Missing.GetType();
dbtype = dbtype.ToLower();
Type commonType = typeof(object);
switch (dbtype)
{
case "bigint": commonType = typeof(long); break;
case "binary": commonType = typeof(byte[]); break;
case "bit": commonType = typeof(bool); break;
case "char": commonType = typeof(string); break;
case "date": commonType = typeof(DateTime); break;
case "datetime": commonType = typeof(DateTime); break;
case "datetime2": commonType = typeof(DateTime); break;
case "datetimeoffset": commonType = typeof(DateTimeOffset); break;
case "decimal": commonType = typeof(decimal); break;
case "float": commonType = typeof(double); break;
case "image": commonType = typeof(byte[]); break;
case "int": commonType = typeof(int); break;
case "money": commonType = typeof(decimal); break;
case "nchar": commonType = typeof(string); break;
case "ntext": commonType = typeof(string); break;
case "numeric": commonType = typeof(decimal); break;
case "nvarchar": commonType = typeof(string); break;
case "real": commonType = typeof(Single); break;
case "smalldatetime": commonType = typeof(DateTime); break;
case "smallint": commonType = typeof(short); break;
case "smallmoney": commonType = typeof(decimal); break;
case "sql_variant": commonType = typeof(object); break;
case "sysname": commonType = typeof(object); break;
case "text": commonType = typeof(string); break;
case "time": commonType = typeof(TimeSpan); break;
case "timestamp": commonType = typeof(byte[]); break;
case "tinyint": commonType = typeof(byte); break;
case "uniqueidentifier": commonType = typeof(Guid); break;
case "varbinary": commonType = typeof(byte[]); break;
case "varchar": commonType = typeof(string); break;
case "xml": commonType = typeof(string); break;
default: commonType = typeof(object); break;
}
return commonType;
}
}
#>
這個其實也是能夠一塊兒放到模板裏的，不過由於好幾個地方都須要用到，爲了修改方便，仍是單獨拿出來比較好。ide
使用的時候會用到:ui
<#@ include file="$(ProjectDir)../LJD.App.Util/T4/DbHelper.ttinclude" #>
顯而易見，我放到了 LJD.App.Util類庫下T4文件夾spa
這裏說下T4 程序集指令 還有一篇文章：T4模版引擎之基礎入門 是這樣說的
<#@ assembly name="[assembly strong name|assembly file name]" #>
一、程序集指令至關於VS裏面咱們添加程序集引用的功能，該指令只有一個參數name，用以指定程序集名稱，若是程序集已經在GAC裏面註冊，那麼只須要寫上程序集名稱便可，如<#@ assembly name="System.Data.dll" #>，不然須要指定程序集的物理路徑。
二、T4模版的程序集引用是徹底獨立的，也就是說咱們在項目中引用了一些程序集，而後項目中添加了一個T4模版，T4模版所須要的全部程序集引用必須明確的在模版中使用程序集執行引用才能夠。
三、T4模版自動加載如下程序集Microsoft.VisualStudio.TextTemplating.1*.dll、System.dll、WindowsBase.dll，若是用到了其它的程序集須要顯示的使用程序集添加引用才能夠
四、可使用 $(variableName) 語法引用 Visual Studio 或 MSBuild 變量（如 $(SolutionDir)），以及使用 %VariableName% 來引用環境變量。介紹幾個經常使用的$(variableName) 變量：
$(SolutionDir):當前項目所在解決方案目錄
$(ProjectDir):當前項目所在目錄
$(TargetPath):當前項目編譯輸出文件絕對路徑
$(TargetDir):當前項目編譯輸出目錄，即web項目的Bin目錄，控制檯、類庫項目bin目錄下的debug或release目錄(取決於當前的編譯模式)
舉個例子：好比咱們在D盤根目錄創建了一個控制檯項目TestConsole，解決方案目錄爲D:\LzrabbitRabbit，項目目錄爲
D:\LzrabbitRabbit\TestConsole，那麼此時在Debug編譯模式下
$(SolutionDir)的值爲D:\LzrabbitRabbit
$(ProjectDir)的值爲D:\LzrabbitRabbit\TestConsole
$(TargetPath)值爲D:\LzrabbitRabbit\TestConsole\bin\Debug\TestConsole.exe
$(TargetDir)值爲D:\LzrabbitRabbit\TestConsole\bin\Debug\
好了，準備工做都作完了，要建立T4模板了，這個還要圖嗎？
而後貼上這段代碼，在foreach中發揮你的想一想吧！對了，要注意命名空間和using哈~
<#@ output extension=".cs" #> <#@ assembly name="System.Core" #> <#@ assembly name="System.Data" #> <#@ assembly name="System.Data.DataSetExtensions" #> <#@ assembly name="System.Xml" #> <#@ import namespace="System" #> <#@ import namespace="System.Xml" #> <#@ import namespace="System.Linq" #> <#@ import namespace="System.Data" #> <#@ import namespace="System.Data.SqlClient" #> <#@ import namespace="System.Collections.Generic" #> <#@ import namespace="System.IO" #> <#@ include file="$(ProjectDir)../LJD.App.Util/T4/DbHelper.ttinclude" #> //------------------------------------------------------------------------------ // <auto-generated> // 此代碼由T4模板自動生成 // 生成時間 <#= DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")#> by Jelly // 對此文件的更改可能會致使不正確的行爲，而且若是從新生成代碼，這些更改將會丟失。 // </auto-generated> //------------------------------------------------------------------------------ using LJD.App.Model.DbModels; namespace LJD.App.Repository.IRepository { <# foreach(DbTable table in DbHelper.GetDbTables(config.ConnectionString, config.DbDatabase)){#> <# if(table.TableName!="Base") {#> /// <summary> /// <#=table.Description#> /// </summary> public partial interface I<#=table.TableName#>Repository : IBaseRepository<<#=table.TableName#>> { } <#} #> <# }#> }
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