Passing DataTable to stored procedure as an argument

Question

I have a data table created in C#.

DataTable dt = new DataTable();
dt.Columns.Add(\"Name\", typeof(string));
dt.Columns.Add(\"Age\", typeof(int));

dt.Rows.A         


        

Answer 1

First you need to create a Userdefined type of table that resembles your actual table. See the example below,

CREATE TYPE SomeType AS TABLE 
(
   C1 int, 
   C2 VARCHAR(50)
)
After this you need to create a stored procedure that takes this table type   as parameter.


CREATE PROCEDURE SomeUSP
  @tabType SomeType READONLY
AS
BEGIN
   SET NOCOUNT ON;

   INSERT INTO Yourtable(C1,C2)
   SELECT C1,C2 FROM @tabType 
END

That's it...Job done :)

Answer 2

You can change the stored procedure to accept a table valued parameter as an input. First however, you will need to create a user defined table TYPE which matches the structure of the C# DataTable:

CREATE TYPE dbo.PersonType AS TABLE
(
    Name NVARCHAR(50), -- match the length of SomeTable.Column1
    Age INT
);

Adjust your SPROC:

CREATE PROCEDURE dbo.InsertPerson
    @Person dbo.PersonType READONLY
AS
BEGIN
  INSERT INTO SomeTable(Column1, Column2) 
     SELECT p.Name, p.Age
     FROM @Person p;
END

In C#, when you bind the datatable to the PROC parameter, you need to specify the parameter as:

parameter.SqlDbType = SqlDbType.Structured;
parameter.TypeName = "dbo.PersonType";

See also the example here Passing a Table-Valued Parameter to a Stored Procedure