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CHAPTER 13 USING VISUAL DATABASE AND FORM DESIGN TOOLS
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Figure 13-3. The Database Explorer Open View Definition menu item provides a variety of different perspectives to help you understand a view.
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Adding Objects to a SQL Server Express Database
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Just as you can explore existing objects in a SQL Server Express database, you can also add new objects to a SQL Server Express database. The visual database tools in Database Explorer are particularly convenient for developers who want to add tables and views without a detailed knowledge of T-SQL. Even when Database Explorer does not provide a rich graphical interface for the creation of database objects, it provides a template to reduce the amount of T-SQL code that you must enter to complete the definition of a new object, such as for a trigger or a stored procedure. In the case of triggers, Database Explorer presents different trigger types depending on whether you are adding a trigger for a table or a view. With Database Explorer, you create objects at design time. In some circumstances, this has advantages over creating database objects at runtime. First, it is typically easier to create objects at design time. This, in turn, can reduce your development effort and leave more time to think about the project objectives and the best way to meet them. Creating objects at runtime is typically more code intensive than creating them at design time. If you are only creating an object once, or just a few times, design-time creation of objects with a tool such as Database Explorer offers a definite advantage. Here we ll create a table called DotNetTable. This table has just three columns and a primary key based on a column with an IDENTITY property setting. If necessary, drop a prior version of the table by right-clicking the table and choosing Delete. The DotNetTable example in this section creates the new table in the AdventureWorks database. The files for this database reside in the Data folder of the SQL Server Express instance on the test computer for this book.
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Start the process by right-clicking the Tables folder in Database Explorer and choosing Add New Table. This selection opens a window for specifying the new table to the right of Database Explorer. The top of the window contains the first row of a table for specifying the table s first column. The column headings for the rows in the table are Column Name, Data Type, and Allow Nulls. The bottom of the window initially contains an empty properties sheet with a tab labeled Column Properties. Figure 13-4 shows the Design view settings for the first row in the DotNetTable database table. The top of the Design view shows the process of adding a primary key specification for the first row. The bottom of the Design view shows the Identity Specification property for the first column in the table. Figure 13-5 displays the Design view after finishing the specification of the third and final column (ContactEAddr) for the new table. The bottom part of the Design view shows the selection of Length immediately after the specification of a maximum length of 60 characters for this nvarchar column. None of the columns allow nulls, so all three Allow Nulls check boxes in the top of the Design view are clear or unselected. These check boxes are checked by default.
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Figure 13-4. Database Explorer facilitates specifying an IDENTITY property for a column and allows you to design a column as the basis for a primary key in a table.
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CHAPTER 13 USING VISUAL DATABASE AND FORM DESIGN TOOLS
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Figure 13-5. Database Explorer allows you to set many column properties, such as the maximum number of characters in a column with an nvarchar data type. After completing the specification of a new table, you can close the window. Database Explorer asks if you want to save your changes to the item. Click Yes. Then, assign a name, such as DotNetTable, to your new table. You can open a new empty table, such as DotNetTable, with the Show Table Data menu item. Later you can manually add data to the table by opening the table with the Show Table Data menu item. Then, just type values into the columns for each new row. Remember to omit entering values for columns with an IDENTITY property setting because SQL Server adds values to columns with an IDENTITY property setting. You can add a new view for showing the values populating the DotNetTable database table. 1. Start the process by right-clicking the Database Explorer Views folder and choosing Add New View. 2. From the Tables tab of the Add table dialog box, choose DotNetTable as the source for the new view. 3. In the Diagram tab, select the check boxes for all three columns in the DotNetTable. These selections add the column names to the Criteria pane and populate the SQL pane with a SELECT statement defining the new view. 4. Then, click the Execute SQL control on the View Designer toolbar. This populates the Result pane in the designer.
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