When all of your columns and data information are entered, select File | Save When in Visual Studio .NET

Generation GTIN - 12 in Visual Studio .NET When all of your columns and data information are entered, select File | Save When

7 When all of your columns and data information are entered, select File | Save When
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you do, a dialog box appears where you enter the name of your table Use the name Supporters You will see a new table appear in the Tables folder in the Server Explorer
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Figure 12-4 Setting the primary key
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When you have all of the fields (columns) added, you will need to add data to the table In the next section you will see how to do it using Visual Studio 2008 Further on in the chapter you will see how to add data that have been input into ASPNET forms and sent to the database using C# and the SQL commands you learned in the previous chapter
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Adding Data to a Table
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Think of a table in a database as a two-dimensional storage facility All of the data you enter resides on a matrix made up of fields (columns) and records (rows) As you enter new data into your table, you create a new row Eventually, you will want to set up your
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Figure 12-5 Entering fields and SQL data types
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12: ADONET: Hello Database
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Figure 12-6 Adding data to table
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application so that remote users anywhere in the world can enter data, but for now you can enter data simply by typing it in using Visual Studio 2008:
1 Right-click on the Supporters table, and in the pop-up menu select Show Table Data as
shown in Figure 12-6 When the table opens, you will see NULL values for all of your fields in a single row as shown in Figure 12-6
2 As you start entering data by typing the information into each cell, you will see a
little red circle with an explanation point as shown in Figure 12-7 Once you are finished with each row, the red circles go away If you enter data incorrectly, a dialog box appears once you are finished, indicating data entry error Incorrect data entry is generally due to either putting in the wrong kind of data or exceeding the limits of one of the fields a very long name might exceed the limit of 15 characters in the LastName field, for example
Figure 12-7 Entering table values
ASPNET 35: A Beginner s Guide
Figure 12-8 Completed data entry
You might be wondering how you d enter data by using the table directly rather than through a web portal The web owner, such as a store manager who changes products and prices or some other information to which no one else should have access, updates certain kinds of databases However, even for data upkeep and maintenance you will be better served by adding an administrative module for making changes to data in the table For the most part, entering table data in the manner shown here is for becoming accustomed to the different data types and being able to see exactly what happens to data that you enter For example, in the DateLastContact column, all of the data were entered using the format
m/d/yy (eg, 5/22/08)
However, once the data are entered in the DateLastContact field, it changes the data to the format
m/d/yyyy time (eg, 5/55/2008 12:00:00 AM)
Also, you learn about the kinds of data you can and cannot enter in certain fields Figure 12-8 shows what your table looks like when you re finished entering the data You will always have an additional row with NULL values when you re done as shown in Figure 12-8, but that row is not saved to the table It simply indicates that that table is ready to accept the next record
Making a Table Query
Once you have a database with data, you ll want to make SQL queries using the commands described in the previous chapter ( 11) The SQL commands are made targeting tables, and Visual Studio allows you to make queries and execute SQL to return the information generated by the query The following steps show you how:
1 Select the Supporters table in the Tables folder 2 Right-click on the table and select New Query
12: ADONET: Hello Database
3 When the dialog box appears, click the Add button to select the Supporters table for
query practice Once you have done so, you will see the Query editor as shown in Figure 12-9
4 Click the LastName, Donation, and DateLastContact fields in the Supporters
checkbox window in the top panel
5 In the middle panel, in the Filter column of the Donation record, type in >200
When you do, you will see a set of SQL commands below the table:
SELECT LastName,Donation,DateLastContact FROM Supporters WHERE (Donation > 200
Figure 12-9 Working with a table query
ASPNET 35: A Beginner s Guide
That SQL query is the sequence you would use in a C# statement to make a database query to the Supporters table
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