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Sometimes you might want to get a job done quickly and also want to query the database with two or more queries at the same time. And, you wouldn t want the overall application performance to suffer in any way either by instantiating more than one command or data reader, or by exhaustively using the same objects over and over again, adding to the code as you go. So, is there a way you can get a single data reader to loop through multiple result sets Yes, data readers have a method, NextResult(), that advances the reader to the next result set.

Character codes typically match characters to single-byte representations. When a database application is meant for use with one language in a single locale, such as United States English, then a character code set is an especially useful way of translating bytes to characters. This recommendation uses a single code page that translates bytes to characters. As the number of regional locales that an application has to serve grows beyond a few, it can become exceedingly difficult to find a single code page for translating byte streams properly across all locales. In these circumstances, switching to Unicode characters, which use 2 bytes per character, simplifies the process of translating byte streams to characters in a consistent way across locales. Recall that Unicode character sets are applicable to all modern languages used for business throughout the world. Unicode characters are also especially appropriate for selected Asian languages with more characters than a single byte can represent, such as Simplified Chinese, Traditional Chinese, Japanese, and Korean. Each of the three types of byte stream types (character, Unicode character, and binary) has three corresponding data types. The first basic data type is for fixed-length values, such as Social Security numbers or credit card numbers. The second basic data type is for variable-length strings. This kind of data type is particularly appropriate for columns storing names, such as first name or last name, in which the values within a column can vary substantially in length across a table s rows. The third basic data type is for byte streams that exceed 8,000 bytes. The column values designated by these long strings are sometimes called large objects.

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Let s use NextResult() to process multiple result sets. 1. Add a new Console Application project named MultipleResults to your 07 solution. 2. Replace the code in Module1.vb with the code in Listing 7-6.

Exercise 2-3

It is common in database applications to use a character data type to represent an identification number, such as a credit card number or a postal code.

Imports System Imports System.Data Imports System.Data.SqlClient Module Module1 Sub Main() ' Set up connection string Dim connString As String = _ "server = .\sqlexpress;" _ & "integrated security = true;" _ & "database = northwind" ' Set up first query Dim sql1 As String = _ "select " _ & " companyname, " _ & " contactname " _ & "from " _ & " customers " _ & "where " _ & "companyname like 'A%' " ' Set up second query Dim sql2 As String = _ "select " _ & " firstname, " _ & " lastname " _ & "from " _ & " employees "

Because large objects can slow the retrieval of data from a table, you may wish to isolate large objects in a separate table that points back to another table with nonlarge objects. This limits the impact of retrieving large objects to occasions when you explicitly need to access them. By storing large objects in a database, you can secure access to them via database security features. Another option is to store large objects as files and then include path and file names in your database. This practice relieves a database of storing and retrieving large objects. In this second scenario, you can manage access to paths containing files with large objects via Windows access control lists.

' Combine queries Dim sql As String = sql1 & sql2 ' Create connection Dim conn As SqlConnection = New SqlConnection(connString) Try ' Open connection conn.Open() ' Create command Dim cmd As SqlCommand = New SqlCommand(sql, conn) ' Create data reader Dim rdr As SqlDataReader = cmd.ExecuteReader() ' Loop through result sets Do While (rdr.Read()) Console.WriteLine("{0} : {1}", rdr(0), rdr(1)) End While Console.WriteLine("".PadLeft(60, "=")) Loop While (rdr.NextResult()) ' Close data reader rdr.Close() Catch e As Exception ' Display error Console.WriteLine("Error: " & e.ToString) Finally ' Close connection conn.Close() End Try End Sub End Module

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