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Quickest way to insert records from one db into another

Posted on 2006-10-20
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Last Modified: 2010-04-16
Hi,

I have a DataTable entitled "dtSource" from database 'A'.  I would like to push the data into database 'B'.  Both databases are SQL Server 2005 and both table schemas are the same.

I suppose I could loop through the rows like so:

string sql = "";
foreach(DataRow dr in dt.Rows)
{
    sql += "INSERT INTO...."
    sql += dr[0].ToString() + ", ";
    etc....
}

There has to be a faster and/or more of an elegant way of doing this.

Thanks
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Question by:brdrok
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Accepted Solution

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topdog770 earned 300 total points
Comment Utility

foreach(DataRow dr in dt.Rows)
{
    myDestinationDataTable.ImportRow(dr);
}

Then you can use Update to populate the second database



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Expert Comment

by:topdog770
Comment Utility
Let me know if you would like a bit more detail or if this is just the nudge you were looking for
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Expert Comment

by:strickdd
Comment Utility
Just execute the following SQL

sql = "Insert INTO dbo.A.dtSource " +
     "SELECT * FROM dbo.b.dtSource";
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Expert Comment

by:strickdd
Comment Utility
This is quicker and cleaner because SQL can process it faster than ASP.Net code can loop through a DataTable.
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Author Comment

by:brdrok
Comment Utility
Thank you for this informational gold nugget...

I feel kind of silly asking this but I have a table with 40+ columns, is there anyway to just call the Update() without having to specify a gazillion parameters like the following?

// Create the InsertCommand.
   command = new SqlCommand(
        "INSERT INTO Customers (CustomerID, CompanyName) " +
        "VALUES (@CustomerID, @CompanyName)", connection);

    // Add the parameters for the InsertCommand.
    command.Parameters.Add("@CustomerID", SqlDbType.NChar, 5, "CustomerID");
    command.Parameters.Add("@CompanyName", SqlDbType.NVarChar, 40, "CompanyName");

thanks
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Author Comment

by:brdrok
Comment Utility
// Add the parameters for the InsertCommand.
    command.Parameters.Add("@CustomerID", SqlDbType.NChar, 5, dr["CustomerID"]);
    command.Parameters.Add("@CompanyName", SqlDbType.NVarChar, 40, dr["CompanyName"]);

etc
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Assisted Solution

by:strickdd
strickdd earned 200 total points
Comment Utility
If you are JUST inserting information the code I gave you will not require ANY parameters. If you JUST need to update then i believe this format will work:

UPDATE <table_name> <alias>
SET (<column_name>,<column_name> ) = (
   SELECT (<column_name>, <column_name>)
   FROM <table_name>
   WHERE <alias.column_name> = <alias.column_name>);


if you need to do both, you will need to find out which rows you are inserting and the run an insert on those rows after the update.
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Expert Comment

by:topdog770
Comment Utility
In Oracle, you would need to have a database link enabled to copy data from one database to another.
If you can copy from db to db directly in MS SQL then strickdd's approach is a good one


In this approach
===================
foreach(DataRow dr in dt.Rows)
{
    myDestinationDataTable.ImportRow(dr);
}
====================

1. Use an OleDataAdapter to fill the source table
2. Use an OleDataAdapter to set the schema in the destination table
3. Populate the destination table by using the import row approach
4. call the OleDataAdapter's Update for the destination table and you should be set.
You will not have to specifiy any parameters at all.



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Expert Comment

by:strickdd
Comment Utility
topdog770,
    If you read the initial question it is clearly stated that "Both databases are SQL Server 2005".
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Author Comment

by:brdrok
Comment Utility
Gentleman...thank you very much.  Learned quite a bit today.  

The only thing I had to add is the SetAdded() method

foreach(DataRow dr in dt.Rows)
{
    dr.SetAdded();
    myDestinationDataTable.ImportRow(dr);
}

otherwise my Update() wouldn't be able to find any records to insert.

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