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The OPENROWSET syntax that we will be looking at is shown next, and it has to be used as if we are returning data from a table, therefore we would need to use the INSERT...SELECT FROM OPENROWSET functionality. FROM OPENROWSET(BULK 'name_of_file', type_of_operation) column_alias The first option is the name_of_file. This will define the location, the name, and the file type of the file we wish to bulk load. The second option allows us three different types of bulk loading: SINGLE_BLOB: This reads the file and creates one row and column of data, which is defined as varbinary(max). SINGLE_CLOB: Same as SINGLE_BLOB, except the data is varchar(max) using the collation of the database the query is run on. SINGLE_NCLOB: Same as SINGLE_CLOB, but the data is unicoded and therefore is nvarchar(max). Once the data has been bulk loaded, we need to give the column a column alias so we can refer to it within our SELECT statement. So the full statement would look like this: INSERT INTO table_name (column_in_table) SELECT column_alias.* FROM OPENROWSET(BULK 'name_of_file ',type_of_operation) column_alias To update a row, you would need to use OPENROWSET as a subquery to set the column you wish to modify.
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CHAPTER 12 ADVANCED T-SQL
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Try It Out: Working with Image LOB Data
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1. In this example, we will insert a new TransactionDetails.Transactions row and insert an image into the Notes column. This image could be from a document scanner of the share purchase made, a copy of the written check from the bank account, or even a copy of the credit card receipt. As security is the byword in SQL Server, we won t be showing this, and I will use a picture found on my computer. 2. Enter the following code noting that we have a column alias of PhotoToLoad that is defined from the BULK operation and then used in the SELECT: INSERT INTO TransactionDetails.Transactions (CustomerId, TransactionType, DateEntered,Amount,Notes, RelatedProductId) SELECT 2, 1, GETDATE(),1000,PhotoToLoad.*, 1 FROM OPENROWSET (BULK 'd:\photo.tif', SINGLE_BLOB) PhotoToLoad 3. When you execute this code, you should see the following results:
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(1 row(s) affected)
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4. To update the row, first of all find the TransactionId of the row entered previously; in my case this was 24. Then we create a subquery in which we only return one column and one row. We can use this to set the value within a column. UPDATE TransactionDetails.Transactions SET Notes = ( SELECT PhotoToLoad.* FROM OPENROWSET (BULK 'd:\photo2.jpg', SINGLE_BLOB) PhotoToLoad) WHERE transactionId = 7 5. When you execute this code, you should see the following results:
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Note Images cannot be retrieved for viewing within SQL Server. It is necessary to use some sort of graphical program or tool to display the image.
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CHAPTER 12 ADVANCED T-SQL
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Summary
So we are coming toward the end of the book, and you are well primed with T-SQL knowledge of what you can achieve within stored procedures and functions. In 13, we take a look at triggers, and all you have learned with programming T-SQL can also be applied there as well. Subqueries are one of the most commonly used areas of T-SQL, but common table expressions are also useful, so knowing these areas well will enable you to move forward at a rapid pace. Combine this knowledge with the functionality covered in 11, especially when working with JOINs, and you should start to see how powerful T-SQL can be at working with time-based data. One last piece of advice: if a query starts becoming very complex, you may find that it starts performing badly. We don t look at performance of queries within this book, although we have discussed indexes and how they can help your query perform better. Always take a step back and think, Would this work better as two queries where the first query creates a subset of data Writing the most complex of queries that processes all the data in one pass of the data may not always be the best answer.
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