ADONET Programming in VS .NET

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Figure 68: A DataGrid Control with Aliased Column Names
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The installation of the SQL Server CE Query Analyzer depends on the development environment onto which SQL Server CE is installed When you install SQL Server CE, the SQL Server CE Query Analyzer is not installed by default on a device Once the Query Analyzer (as we ll call the CE version for brevity in the rest of this discussion) is installed on the device, you can run the executable file, Isqlw20exe, directly from the Start menu or from the directory in which it is installed Clicking on a database file from within the File Explorer also opens the Query Analyzer The Query Analyzer allows you to see structural information about the database (as shown in Figure 69) and submit queries to that database (as shown in Figure 610) The Query Analyzer form displays a minimize box, not a close box If you use the Query Analyzer to examine your database and then click on the minimize box, the Query Analyzer disappears but does not close nor does it close the database it is displaying Any other application that tries to access the database cannot do so until you either close the database connection in the Query Analyzer (in the Objects tab, click on the tree node with the database name and then click the Stop button on the toolbar) or close the Query Analyzer itself (select Tools | Exit) To help explain the ADONET classes, in this chapter we create a series of sample applications We begin with database creation and table and index creation; then we explore retrieving, displaying, and updating data
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63 Microsoft SQL Server CE
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Figure 69: SQL Server CE Query Analyzer, Objects Tab
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Figure 610: SQL Server CE Query Analyzer, SQL Tab
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using the two-tier approach; and finally we discuss the three-tier approach of creating and using data sets and data binding
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634 Creating a SQL Server CE Database Our first sample application for accessing SQL Server CE is located in the CreateDatabase project for this chapter on the book s Web site Shown in Figure 611, our application is used to create and populate a database
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Figure 611: The CreateDatabase Program
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To create a SQL Server CE database, we use the Engine class located in the SystemDataSqlServerCe namespace Because each SQL Server CE database is a single file, all that we need to tell the Engine object is the path and name of that file We can do this either in the Engine class constructor or by setting the object s LocalConnectionString property In either case, we must specify the filename prior to executing the CreateDatabase method of the Engine class because this method does not take any parameters Thus, the code to create a SQL Server CE database looks like Listing 63
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Listing 63: Creating a SQL Server CE Database
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private string private string strFile = @"My Documents\ourProduceCosdf"; strConn = "Data Source=" + @"My Documents\ourProduceCosdf";
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private void mitemCreateDB_Click(object sender, EventArgs e) { if ( FileExists(strFile) ) { FileDelete(strFile); } SqlCeEngine dbEngine = new SqlCeEngine(); dbEngineLocalConnectionString = strConn; try { dbEngineCreateDatabase();
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63 Microsoft SQL Server CE
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} catch( SqlCeException exSQL ) { MessageBoxShow("Unable to create database at " + strFile + " Reason: " + exSQLErrors[0]Message ); } }
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Although the Engine class has a CreateDatabase method, it does not have a DropDatabase method You must drop a database by submitting a DROP DATABASE statement to the SQL Server CE database or by using the File class to delete the file
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635 Populating a SQL Server CE Database Now that we have created our SQL Server CE database, we can populate it with tables, indexes, and data You might think that we use the Engine class to do this, but we do not The Engine class operates only on an entire database, not on the individual components within the database, such as tables In 8 we look at populating a SQL Server CE database from a connected SQL Server database, but in this chapter we focus on creating and maintaining the database Therefore, to populate our SQL Server CE database, we use standard SQL DDL statements, such as CREATE TABLE and CREATE INDEX, and the standard SQL DML language statements INSERT, UPDATE, and DELETE Submitting SQL statements to a database requires two classes: one to open the connection and one to submit the statement
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