How to Bulk Copy a DataTable into MySQL Using MySqlBulkLoader?

Using MySqlBulkLoader to Bulk Copy a DataTable into MySQL

Introduction

When migrating an application from Microsoft SQL Server to MySQL, a common challenge arises with bulk copying operations. This article will focus on addressing this issue by exploring how to use the MySqlBulkLoader class for bulk data transfer.

Problem

In System.Data.SqlClient, the SqlBulkCopy class provides an efficient way to bulk insert data into SQL Server tables. However, MySQL does not have a direct equivalent of this class.

Proposed Solution

An alternative approach for bulk copying into MySQL is to use the MySqlBulkLoader class from the MySql.Data package. This class enables the bulk insertion of data from a delimited file into a MySQL table.

Implementation

To implement bulk copying using MySqlBulkLoader, follow these steps:

1. Dump the DataTable to a temporary CSV file using the Rfc4180Writer class:

<code class="csharp">string tempCsvFileSpec = @"C:\Users\Gord\Desktop\dump.csv";
using (StreamWriter writer = new StreamWriter(tempCsvFileSpec))
{
    Rfc4180Writer.WriteDataTable(rawData, writer, false);
}</code>

2. Create a MySqlBulkLoader instance and configure its properties:

<code class="csharp">var msbl = new MySqlBulkLoader(conn);
msbl.TableName = "testtable";
msbl.FileName = tempCsvFileSpec;
msbl.FieldTerminator = ",";
msbl.FieldQuotationCharacter = '"';</code>

3. Perform the bulk load:

<code class="csharp">msbl.Load();</code>

4. Delete the temporary CSV file:

<code class="csharp">System.IO.File.Delete(tempCsvFileSpec);</code>

Performance Considerations

Initial concerns about performance issues with using a temporary CSV file proved to be unfounded. Tests have shown that bulk copying using the MySqlBulkLoader can be much faster than using the standard MySqlDataAdapter#Update() method.

Conclusion

By following these steps, developers can achieve efficient bulk copying from a DataTable into a MySQL table using the MySqlBulkLoader class. This provides a reliable and performant solution for migrating applications from SQL Server to MySQL.

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