SQL SERVER拓展存储过程

一直都是C#调用数据库的对象，这里介绍的拓展存储过程可以在DB中调用C#的dll并且返回到DB一些信息（表或者字符串）

C#代码如下，主要用以返回一个路径下面的文件，用以测试

using Microsoft.SqlServer.Server;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data.SqlTypes;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
 
 
public partial class UserDefinedFunctions
{
    [SqlFunction(FillRowMethodName = "FillRow")]
    public static IEnumerable DirectoryList(string sRootDir, string sWildCard, bool bIncludeSubDirs)
    {
        ArrayList aFileArray = new ArrayList();
        DirectorySearch(sRootDir, sWildCard, bIncludeSubDirs, aFileArray);
        return aFileArray;
    }
    private static void DirectorySearch(string directory, string sWildCard, bool bIncludeSubDirs, ArrayList aFileArray)
    {
        GetFiles(directory, sWildCard, aFileArray);
        if (bIncludeSubDirs)
        {
            foreach (string d in Directory.GetDirectories(directory))
            {
                DirectorySearch(d, sWildCard, bIncludeSubDirs, aFileArray);
            }
        }
    }
    private static void GetFiles(string d, string sWildCard, ArrayList aFileArray)
    {
        foreach (string f in Directory.GetFiles(d, sWildCard))
        {
            FileInfo fi = new FileInfo(f);
            object[] column = new object[2];
            column[0] = fi.FullName;
            column[1] = fi.LastWriteTime;
            aFileArray.Add(column);
        }
    }
    private static void FillRow(object obj, out string filename, out DateTime date)
    {
        object[] row = (object[])obj;
        filename = (string)row[0];
        date = (DateTime)row[1];
    }
}

View Code

SQL server 代码

ALTER DATABASE InvestorRelations
SET TRUSTWORTHY ON;
 
 
USE InvestorRelations
 
CREATE ASSEMBLY fExampleTVF
FROM 'E:\学习\SessionTest\TestKZCCGC\bin\Debug\TestKZCCGC.dll'
WITH PERMISSION_SET=EXTERNAL_ACCESS
  
CREATE FUNCTION fTVFExample(
@RootDir nvarchar(max),
@WildCard nvarchar(max),
@IncludeSubDirs bit
)
RETURNS TABLE (
    FileName nvarchar(max),
    LastWriteTime datetime
)
AS EXTERNAL NAME fExampleTVF.UserDefinedFunctions.DirectoryList

最后可以查询下：

SELECT FILENAME,LASTWRITETIME
FROM dbo.fTVFExample('E:\学习','*.ppt',0)

当你查询的时候，有可能会有报错如下：

当然，这个在某些情况下也是有缺陷的，如果你需要禁用这部分功能，可以参考下面的文章：

https://www.cnblogs.com/chenmh/p/8257369.html

SQL SERVER拓展存储过程

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