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CHAPTER 7 LEVERAGING DATABASE OBJECTS THAT ENCAPSULATE T-SQL
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It is sometimes necessary to copy large quantities of data from an external file into a SQL Server Express table or view. The T-SQL BULK INSERT statement is optimized for this precise task. However, the BULK INSERT statement has a higher level of security and more exacting requirements surrounding its use than an INSERT statement. The BULK INSERT statement offers a couple of key advantages over traditional data manipulation statements. First, it can bypass the insertion of data in a database s log file, which can increase performance. As the number of rows to insert grows, this performance enhancement becomes more significant. Second, you can accept data into a SQL Server table or view from a text file. There is no need for a live connection to another database on a different server. It is frequently relatively easy to export data from data storage systems in text format. Therefore, being able to import from a text file provides the capability to receive data from a very wide range of data storage systems. The advantages of the BULK INSERT statement are partially offset by restrictions and rules associated with its use. Limited permission is available to run the BULK INSERT statement. You have to be a member of the sysadmin or bulkadmin fixed server role to invoke the statement. The user of the BULK INSERT statement must have read access to the source text file. This may involve copying a text file from its original source, though an ideal situation is one in which the source text file is on the same computer as the server, because this optimizes performance. It can be tedious to properly format the arguments for a BULK INSERT statement. If you have a repetitive requirement for importing many rows, the effort to perfect the argument list for the statement will be worth it. The sample in this section uses tab-delimited data, but you can adapt the BULK INSERT statement for use with files containing data in CSV and fixedwidth formats. A related option is to use the bcp command-line utility, which can both import and export large quantities of data. As its name implies, the BULK INSERT statement only imports data. By default, the BULK INSERT statement will import data with tabs delimiting column values and linefeeds delimiting rows. Formatting your input data file in this fashion allows you to take advantage of default argument values for the BULK INSERT statement that simplify its use. The NewClasses.txt sample file has the default format. Figure 7-1 illustrates the look of this format inside the Notepad utility. As you can see, there are two new rows for the Classes table, with ClassID column values of 2 and 3.
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CHAPTER 7 LEVERAGING DATABASE OBJECTS THAT ENCAPSULATE T-SQL
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Figure 7-1. The default sample format used by the BULK INSERT sample for inserting two new rows into the Classes table If you create your input file for the BULK INSERT statement in the default format, you can specify as few as two arguments for the statement. The BULK INSERT statement s first argument is the name of the target table or view to which data will be copied. Next, specify the FROM keyword, and then the path and file name for the text file that contains the data that you want to import. The following CREATE PROC statement for the usp_BULKINSERT stored procedure shows the syntax for a BULK INSERT statement that will insert data from the NewClasses.txt file into the Classes table within the ProSSEAppsCh07 database. CREATE PROC usp_BULKINSERT AS BULK INSERT Classes FROM "c:\NewClasses.txt" GO After you have the stored procedure created, you can invoke it with an EXEC statement. In this very basic example, there is no need for any arguments. EXEC usp_BULKINSERT GO As basic as this demonstration is, the usual process is to perfect the BULK INSERT statement and then wrap it in a stored procedure to simplify its use. Some usual steps to perfect a BULK INSERT can include the following: Getting the data file in the right format, such as the default BULK INSERT format Making sure that the user of the stored procedure with the BULK INSERT statement has permission to invoke the statement Making sure the user has read access to the input data file Developing BULK INSERT arguments that conform to a data file s format if it s not convenient to use the default BULK INSERT format The following SELECT statement and result set show the outcome of running the usp_BULKINSERT stored procedure. The procedure adds two new rows to the Classes table. This very simple example confirms the kind of value you can derive from learning more about the BULK INSERT statement or even the bcp utility. SELECT * FROM Classes GO
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