sqlbulkcopy

问题 I'm using SqlBulkCopy to insert/update from a .net DataTable object to a SQL Server table that includes a sql_variant column. However SqlBulkCopy insists on storing DateTime values put into that column as sql type 'datetime' when what I need is 'datetime2'. My DataTable is defined like this: DataTable dataTable = new DataTable(); dataTable.Columns.Add(new DataColumn("VariantValue", typeof(object))); //this represents my sql_variant column Then I throw some data in there that requires a

问题 I'm working on an ASP.NET MVC4 projet and I'm trying to export data from an xlsx file (Excel 2010 file) to my database by using SQL Bulk Copy. My Excel file contains only 2 columns : the first contains numbers (from 1 to 25) and the second contains characters (successive series of "a, b, c") This is how I try to do in order to export data but I got the error "The given value of type String from the data source cannot be converted to type int of the specified target column" : public

问题 I am trying to insert a Generic list to SQL Server with SQLBulkCopy, And i have trouble wit Identity Field I wan t my destination table to generate identity field How should i handle this, here is my code using (var bulkCopy = new SqlBulkCopy(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString)) { bulkCopy.BatchSize = (int)DetailLines; bulkCopy.DestinationTableName = "dbo.tMyTable"; var table = new DataTable(); var props = TypeDescriptor.GetProperties(typeof

问题 Is there a way to use SqlBulkCopy without converting the data to a DataTable? I have a list of objects (List) in RAM and I really don't want to use more memory to create the DataTable. Could it be possible to implement IDataReader on a List? Thanks! 回答1: I would certainly imagine that you could. BulkDataReader requires schema information; that's why you can't simply provide a List . If you design a class that implements IDataReader , you'll be providing this in your GetSchemaTable

问题 I have an F# program that creates a DataTable , populates it with one row and then writes the data to SQL Server using bulk insert ( SqlBulkCopy ). Although it's working, I can't really figure out how to include a loop that will generate a number of list items / data rows which I can then insert in one statement, rather than having to bulk insert a single row at a time (which is the current case) here's my code: open System open System.Data open System.Data.SqlClient let lcpSqlConnection =

问题 I have the following (simplified) code which I'd like to optimise for speed: long inputLen = 50000000; // 50 million DataTable dataTable = new DataTable(); DataRow dataRow; object[] objectRow; while (inputLen--) { objectRow[0] = ... objectRow[1] = ... objectRow[2] = ... // Generate output for this input output = ... for (int i = 0; i < outputLen; i++) // outputLen can range from 1 to 20,000 { objectRow[3] = output[i]; dataRow = dataTable.NewRow(); dataRow.ItemArray = objectRow; dataTable.Rows

问题 I'm trying to bulk copy a DataTable which has the following columns: "ID" - System.Int32 "Geom" - System.String Into a SQL database with the following columns: "Id" - int "Shape" - geometry Can anyone advise on the best way to do this? Some test code if it helps... DataTable dataTable = new DataTable(); dataTable.Columns.Add("ID", typeof(Int32)); dataTable.Columns.Add("Geom", typeof(String)); dataTable.Rows.Add(1, "POINT('20,20')"); dataTable.Rows.Add(1, "POINT('40,25')"); dataTable.Rows.Add

问题 I load a large amount of records into my application (1 million+) and do a ton of processing on them. The processing requires them all to be in the memory. Afterwards, I want to dump all of the (now modified) records into an empty table. Loading the records takes mere seconds, and I end up with a large array of MyRecord items. Saving using SqlBulkCopy takes mere seconds as well. However SqlBulkCopy requires (I believe) a DataTable - and loading my records into a DataTable is slow -

问题 I wanted to unload from one database(production) and reload into another database(QA) in Redshift having exact same schema. I issued S3 load command as following. copy table(col1,col2,col3,col4) from 's3://<bucket_path>/<file_name>.gzip' CREDENTIALS 'aws_access_key_id=<your_key>;aws_secret_access_key=<your_secret>' delimiter '|' gzip NULL AS 'null_string'; Got following error. ERROR: Failed writing body (0 != XXX) Cause: Failed to inflateinvalid or incomplete deflate data. zlib error code: -3

问题 I am working with Dapper .net for Bulk insert operation in SQL Tables. I am thinking to user SQKBulk copy with Dapper .Net but don't have any experience How to use SqlbulkCopy with Dapper .Net your help is Highly appreciated 回答1: It is not good idea to use dapper for bulk insert, because there it will not fast. The better case for this is use of SqlBulkCopy class. But if you want use Dapper for bulk insert, you can find solution here. 来源： https://stackoverflow.com/questions/29070108/how-to