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SELECT INTO is a BULK operation. (See the "Other Performance Considerations" section at the end of the chapter for details.) Therefore, when the database recovery model is not FULL, it's very fast compared to the alternative of creating a table and then using INSERT INTO. The columns of the new table inherit their names, datatypes, nullability, and IDENTITY property from the query's result set. SELECT INTO doesn't copy constraints, indexes, or triggers from the query's source. If you need the results in a table with the same indexes, constraints, and triggers as the source, you have to add them afterwards. If you need a "fast and dirty" empty copy of some table, SELECT INTO allows you to obtain such a copy very simply. You don't have to script the CREATE TABLE statement and change the table's name. All you need to do is issue the following statement: SELECT * INTO target_table FROM source_table WHERE 1 = 2;

cmd.ExecuteNonQuery(); int prmNum; prmNum=cmd.Parameters.IndexOf("@ReturnValue"); if ( Convert.ToInt64( cmd.Parameters[prmNum].Value)!=0 ) { Label1.Text="Customer " + cmd.Parameters["@ReturnValue"].Value.ToString()+ " Saved!"; CustomerID=Convert.ToInt32( cmd.Parameters["@ReturnValue"].Value); // Put a friendlier name on button this.BtnCancel.Text="Close"; }

The optimizer is smart enough to realize that no source row will satisfy the filter 1 = 2. Therefore, SQL Server won't bother to physically access the source data; rather, it will create the target table based on the schema of the source. Here's an example that creates a table called MyOrders in tempdb, based on the schema of the Orders table in Northwind: SET NOCOUNT ON; USE tempdb; GO IF OBJECT_ID('dbo.MyOrders') IS NOT NULL DROP TABLE dbo.MyOrders; GO SELECT * INTO dbo.MyOrders FROM Northwind.dbo.Orders WHERE 1 = 2;

Keep in mind that if a source column has the IDENTITY property, the target will have it as well. For example, the OrderID column in the Orders table has the IDENTITY property. If you don't want the IDENTITY property to be copied to the target column, simply apply any type of manipulation to the source column. For example, you can use the expression OrderID + 0 AS OrderID as follows: IF OBJECT_ID('dbo.MyOrders') IS NOT NULL DROP TABLE dbo.MyOrders; GO SELECT OrderID+0 AS OrderID, CustomerID, EmployeeID, OrderDate, RequiredDate, ShippedDate, ShipVia, Freight, ShipName, ShipAddress, ShipCity, ShipRegion, ShipPostalCode, ShipCountry INTO dbo.MyOrders FROM Northwind.dbo.Orders WHERE 1 = 2;

} catch ( System.Exception eSave ) { Label1.Text=eSave.Message; } finally { cn.Close(); } }

Suppose you want to insert the result set of a stored procedure or a dynamic batch into a new table, but you don't know what the schema is that you need to create. You can use a SELECT INTO statement, specifying OPENQUERY in the FROM clause, referring to your own server as if it were a linked server: EXEC sp_serveroption <your_server>, 'data access', true; SELECT * INTO <target_table> FROM OPENQUERY(<your_server>, 'EXEC {<proc_name> | (<dynamic_batch>)}') AS O;

The INSERT EXEC statement allows you to direct a table result set returned from a stored procedure or dynamic batch to an existing table: INSERT INTO <target_table> EXEC {<proc_name> | (<dynamic_batch>)};

} private void btnDelete_Click(object sender, System.EventArgs e) { System.Data.SqlClient.SqlConnection cn; System.Data.SqlClient.SqlCommand cmd; if ( CustomerID!=0 ) { cn=new System.Data.SqlClient.SqlConnection( "server=localhost;" + "Integrated Security=SSPI;Initial Catalog=GolfArticles"); cmd=new SqlCommand("spDeleteCustomer",cn); cmd.CommandType=CommandType.StoredProcedure;

Allowing tenants to upload their own code increases the risk of application failure, because you have less control over the code that is running in the application. Many Software as a Service (SaaS) systems apply limits to this. Most simply disallow it. Allowing tenants to upload code or scripts also increases the security risks associated with the application.

This statement is very handy when you need to set aside the result set of a stored procedure or dynamic batch for further processing at the server, as opposed to just returning the result set back to the client. I'll demonstrate practical uses of the INSERT EXEC statement through an example. Recall the discussion about paging techniques in 7. I provided a stored procedure called usp_firstpage, which returns the first page of orders based on OrderDate, OrderID ordering. I also provided a stored procedure called usp_nextpage, which returns the next page of orders based on an input key

(@anchor) representing the last row in the previous page. In this section, I will use slightly revised forms of the stored procedures, which I'll call usp_firstrows and usp_nextrows. Run the code in Listing 8-1 to create both procedures.

try { cmd.Parameters.Add("@CustomerID",CustomerID); cn.Open(); cmd.ExecuteNonQuery();

USE Northwind; GO -- Index for paging problem IF INDEXPROPERTY(OBJECT_ID('dbo.Orders'), 'idx_od_oid_i_cid_eid', 'IndexID') IS NOT NULL DROP INDEX dbo.Orders.idx_od_oid_i_cid_eid; GO CREATE INDEX idx_od_oid_i_cid_eid ON dbo.Orders(OrderDate, OrderID, CustomerID, EmployeeID); GO -- First Rows IF OBJECT_ID('dbo.usp_firstrows') IS NOT NULL DROP PROC dbo.usp_firstrows; GO CREATE PROC dbo.usp_firstrows @n AS INT = 10 -- num rows AS SELECT TOP(@n) ROW_NUMBER() OVER(ORDER BY OrderDate, OrderID) AS RowNum, OrderID, OrderDate, CustomerID, EmployeeID FROM dbo.Orders ORDER BY OrderDate, OrderID; GO -- Next Rows IF OBJECT_ID('dbo.usp_nextrows') IS NOT NULL DROP PROC dbo.usp_nextrows; GO CREATE PROC dbo.usp_nextrows @anchor_rownum AS INT = 0, -- row number of last row in prev page @anchor_key AS INT, -- key of last row in prev page, @n AS INT = 10 -- num rows AS SELECT TOP(@n) @anchor_rownum + ROW_NUMBER() OVER(ORDER BY O.OrderDate, O.OrderID) AS RowNum, O.OrderID, O.OrderDate, O.CustomerID, O.EmployeeID FROM dbo.Orders AS O JOIN dbo.Orders AS A ON A.OrderID = @anchor_key AND (O.OrderDate >= A.OrderDate AND (O.OrderDate > A.OrderDate OR O.OrderID > A.OrderID)) ORDER BY O.OrderDate, O.OrderID; GO

The stored procedures use new features in SQL Server 2005, so you won't be able to create them in SQL Server 2000.

// Put a friendlier name on button. this.BtnCancel.Text="Close"; // Display confirmation... Label1.Text="Customer " + CustomerID + " Deleted!"; // No customer anymore... CustomerID=0; doDataBind(); btnDelete.Visible=true; } catch ( System.Exception eDelete ) { Label1.Text=eDelete.Message; } finally { cn.Close(); }