如何以编程方式更新嵌入式SQL连接的命令属性

Question

使用c＃openxml - 我试图打开一个excel文件，绑定到它的connection.xml流，并更新嵌入式SQL查询。我能够使用连接/命令节点成功替换单个字符序列，但尝试显式设置命令属性（即node.Attribute [“command”]。Value = select * from ....）导致损坏

xmlDoc.Load(wkb.WorkbookPart.ConnectionsPart.GetStream());

csNode = xmlDoc.SelectSingleNode("*/*/*[@connection]");

csNode.Attributes["command"].Value = Regex.Replace(csNode.Attributes["command"].Value,        @"\(\[\w*\].\[\w*\].\[\w*\].\[\w*\].*\)", "(" + subQry + ")", RegexOptions.Multiline);

xmlDoc.Save(wkb.WorkbookPart.ConnectionsPart.GetStream()); 

wkb.Close();

Answer 1

不确定这是否是解决此问题的唯一方法，但我能够通过删除原始connections.xml流并创建/附加具有正确值的新工作簿来更正它。

 //select connections node from loaded xml Excel
 csNode = xmlDoc.SelectSingleNode("*/*/*[@connection]");

 //store original node values
 oldConnValue = csNode.Attributes["connection"].Value;
 oldCommValue = csNode.Attributes["command"].Value;

 //delete existing ConnectionsPart - to ensure that bleed-over data is not present
 wkb.WorkbookPart.DeletePart(wkb.WorkbookPart.ConnectionsPart);

 //create a replacement ConnectionsPart
 wkb.WorkbookPart.AddNewPart<ConnectionsPart>();

 csNode.Attributes["connection"].Value = oldConnValue; //reassign existing connection value
 csNode.Attributes["command"].Value = baseQry;         //assign new query

 //save changes to stream
 xmlDoc.Save(wkb.WorkbookPart.ConnectionsPart.GetStream());