在实际应用中，我们经常需要导出数据到Excel文件，你可以使用DTS或SSIS来做。但有时，我们并不需要这么重量级的工具，直接用CLR SP实现就可以了。
假设你已经写好了导出Excel的C# code:
1: /// <summary>
2: /// This is the method registered with sql Server as a
3: /// CLR stored procedure. The attribute,Microsoft.sqlServer.Server.sqlProcedure,is
4: /// required for the method to be a CLR stored procedure.
5: /// </summary>
6: [Microsoft.sqlServer.Server.sqlProcedure]
7: public static void ExportToExcel(sqlString procName,sqlString filePath,sqlString fileName,sqlXml xmlParams)
8: {
9: DataSet exportData = new DataSet();
10:
11: //check for empty parameters
12:
13: if (procName.Value == string.Empty)
14: throw new Exception("Procedure name value is missing.");
15:
16: if (filePath.Value == string.Empty)
17: throw new Exception("Missing file path location.");
18:
19: if (fileName.Value == string.Empty)
20: throw new Exception("Missing name of file.");
21:
22: using (sqlConnection conn = new sqlConnection("context connection=true"))
23: {
24: sqlCommand getoutput = new sqlCommand();
25:
26: getoutput.CommandText = procName.ToString(); ;
27: getoutput.CommandType = CommandType.StoredProcedure;
28: getoutput.CommandTimeout = 120;
29:
30: //To allow for multiple parameters,xml is used
31: //and must then be parsed to set up the paramaters
32: //for the command object.
33: using (XmlReader parms = xmlParams.CreateReader())
34: {
35: while(parms.Read())
36: {
37: if (parms.Name == "param")
38: {
39: string paramName;
40: paramName = parms.GetAttribute("name");
41:
42: string paramValue;
43: paramValue = parms.GetAttribute("value");
44:
45: getoutput.Parameters.AddWithValue(paramName,paramValue);
46: }
47: }
48: }
49:
50: getoutput.Connection = conn;
51:
52: conn.open();
53: sqlDataAdapter da = new sqlDataAdapter(getoutput);
54: da.Fill(exportData);
55: conn.Close();
56: }
57:
58: ExcelExportUtility exportUtil = new ExcelExportUtility(fileName.ToString(),filePath.ToString());
59: //This allows for flexible naming of the tabs in the workbook
60: exportUtil.SheetNameColumnordinal = 0;
61: exportUtil.Export(exportData);
62: }
C#导出Excel细节代码在这儿就不贴了。编译成Assembly,这里我们叫ExcelExport.dll。
首先，启用sql CLR
设置Database可依赖性:
ALTER DATABASE [AdventureWorks] SET TRUSTWORTHY ON
接下来，我们在AdventureWorks 数据库中注册这个Assembly.
1: CREATE ASSEMBLY ExportToExcel
2: FROM 'D:/ExcelExport.dll'
3: WITH PERMISSION_SET = EXTERNAL_ACCESS
创建一个存储过程关联它：
1: CREATE PROCEDURE [dbo].[prc_ExportToExcel]
2: @proc [nvarchar](100),
3: @path [nvarchar](200),
4: @filename [nvarchar](100),
5: @params xml
6: AS
7: EXTERNAL NAME [ExportToExcel].[StoredProcedures].[ExportToExcel]
好的。让我们创建一个查询数据的SP，加一个'MyContactList'列，导出时将取这个名称做为Sheet的名称，另返回多个数据集将生成多个Sheet页。：
1: CREATE PROC GetContactByFirstName
2: @FirstName nvarchar(50)
3: AS
4: BEGIN
5: SELECT 'MyContactList'
6: ,[ContactID]
7: ,[FirstName]
8: ,[LastName]
9: ,[EmailAddress]
10: ,[Phone]
11: FROM [AdventureWorks].[Person].[Contact] Where FirstName=@FirstName
12: END
现在，我们可以使用了,
Declare @params xml
Set @params = '<params><param name="FirstName" value="Peter" /></params>'
--Set @params = '<params />'
exec [AdventureWorks].[dbo].[prc_ExportToExcel]
'[AdventureWorks].[dbo].[GetContactByFirstName]','D:/','MyContact',@params
注意，传递参数是xml，如果无参数刚传’<params />’，FirstName是之前那个SP的参数。最后，运行，将生成文件 D:/MyContact.xls
完了，由此我们可以看到sql CLR的强大。
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