问题描述
我目前正在编写一个小的脚本，该脚本可以导出程序的事件日志并将其写入数据库。但是，我的sql insert命令遇到问题。我究竟做错了什么？这只是一个代码切口
string command = "DECLARE @x xml;";
command += "SELECT @x = P";
command += "FROM OPENROWSET(BULK 'C:\\Users\\NT-AUTORITÄT\\SYstem\\MFilesLog\\Event-Log 23.10.2020 09-05.xml',SINGLE_BLOB) AS Products(P)";
command += "SELECT @x";
command += "DECLARE @hdoc int";
command += "EXEC sp_xml_preparedocument @hdoc,OUTPUT,@x";
command += "INSERT INTO [MFlogs].[dbo].[MLogs]";
command += "SELECT * FROM OPENXML(@hdoc,'/Export/root/event/data/objectversion/objver',2);";
command += "WITH(";
command += "id int '../../../id',";
command += "type varchar(50) '../../../type',";
command += "category varchar(50) '../../../category',";
command += "timestamp varchar(50) '../../../timestamp',";
command += "causedbyuser varchar(50) '../../../causedbyuser',";
command += "objtype varchar(50),";
command += "objid varchar(50),";
command += "version varchar(50),";
command += "objectguid varchar(50) '../objectguid',";
command += "versionguid varchar(50) '../versionguid',";
command += "title varchar(100) '../title',";
command += "displayid int '../displayid')";
sqlCommand cmd = new sqlCommand(command,connection);
int result = cmd.ExecuteNonQuery();
这是事件日志中的错误：
必须声明@ hdoc标量变量。
有人可以帮忙吗？
解决方法
仅查看第一行，就会遇到问题：
command += "SELECT @x = P";
command += "FROM OPENROWSET(BULK 'C:\\Users\\NT-AUTORITÄT\\SYSTEM\\MFilesLog\\Event-Log 23.10.2020 09-05.xml',SINGLE_BLOB) AS Products(P)";
最终会像这样
SELECT @x = PFROM OPENROWSET(BULK 'C:\\Users\\NT-AUTORI ....
因为您没有这样的间隔，但在其他任何地方也都需要它：
command += "SELECT @x = P";
command += " FROM OPENROWSET(BULK 'C:\\Users\\NT-AUTORITÄT\\SYSTEM\\MFilesLog\\Event-Log 23.10.2020 09-05.xml',SINGLE_BLOB) AS Products(P)";
尝试解决所有间距问题，然后看看会发生什么。
,在OUTPUT之前不需要逗号。
替换
command += "EXEC sp_xml_preparedocument @hdoc,OUTPUT,@x";
使用
command += " EXEC sp_xml_preparedocument @hdoc OUTPUT,@x";
还要在每个字符串的开头添加一个空格，或者使用Environment.NewLine或使用StringBuilder.AppendLine。