How to Optimize Bulk Copying DataTables into MySQL Using a Temporary CSV File?

Bulk Copy a DataTable into MySQL Using a Temporary CSV File

When migrating to MySQL from Microsoft SQL Server, you may encounter challenges with bulk copying using a direct DataTable write. While the SqlBulkCopy class is not natively available in MySQL, it is worth considering using a temporary CSV file as an intermediary for optimal performance.

One assumption to avoid is that bulk loading through a CSV file will inherently lead to poor performance. Empirical testing has shown that using the MySqlBulkLoader class can significantly reduce insertion times compared to direct updates through a MySqlDataAdapter.

To achieve this, follow these steps:

1. Write the DataTable contents to a temporary CSV file using a suitable CSV writer.

2. Initialize a new MySqlBulkLoader object and set its properties:

   • TableName to match the target table
   • FileName to point to the CSV file
   • FieldTerminator and FieldQuotationCharacter as needed
3. Call the Load() method to bulk load the data from the CSV file
4. Delete the temporary CSV file after loading is complete

Example code:

<code class="csharp">string tempCsvFileSpec = @"C:\Users\Gord\Desktop\dump.csv";
using (StreamWriter writer = new StreamWriter(tempCsvFileSpec))
{
    Rfc4180Writer.WriteDataTable(rawData, writer, false);
}
var msbl = new MySqlBulkLoader(conn);
msbl.TableName = "testtable";
msbl.FileName = tempCsvFileSpec;
msbl.FieldTerminator = ",";
msbl.FieldQuotationCharacter = '"';
msbl.Load();
System.IO.File.Delete(tempCsvFileSpec);</code>

By leveraging the MySQLBulkLoader class and a temporary CSV file, you can achieve efficient bulk copying of DataTables into MySQL with improved performance compared to direct updates.

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