Insert data into specific columns in SQL Server from C# Datatable

Question

Suppose my SQL Server table looks like

Col1 | Col2 | Col3 | Col4 | Col5

and my datatable looks like

Col X | Col Y | Col Z

How can I map the values from my datatable to specific columns in the SQL Server table?

The datatable contains a large number of rows so I want to avoid using row by row insert.

What would be the best way to accomplish this?

Answer 1

This may help you

SqlBulkCopy.WriteToServer Method (DataTable)

Copies all rows in the supplied DataTable to a destination table specified by the DestinationTableName property of the SqlBulkCopy object.

https://msdn.microsoft.com/en-us/library/ex21zs8x(v=vs.110).aspx

Answer 2

Use a stored procedure with a table valued parameter.
Create a user defined table type with the same structure as your c# data table. Note that the columns of that type must match exactly to the columns of the c# data table, including the order of the columns.

CREATE TYPE dbo.MyTableType AS TABLE
(
    ColX int, -- Must be the same data type of ColX in your c# data table
    ColY nvarchar(200), -- Must be the same data type of ColY in your c# data table
    ColZ float -- Must be the same data type of ColZ in your c# data table
)

Then you can create the stored procedure, where you will actually do the mapping of columns:

CREATE PROCEDURE InsertIntoMyTable
(
    @TableToInsert dbo.MyTableType READONLY -- Table valued parameters must be readonly!
)
AS
    INSERT INTO MyTable (Col1, Col2, Col3)
    SELECT ColZ, ColX, ColY
    FROM @TableToInsert
GO