Figure 213 Providing the SQL Statement for the New Query in .NET framework

Encoding Code128 in .NET framework Figure 213 Providing the SQL Statement for the New Query
Figure 213 Providing the SQL Statement for the New Query
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Using the Query Builder to Write a SQL Statement
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There is a Query Builder that is similar to the one provided in Visual Studio NET 2003 that you can access from the page in the wizard where you specify your SQL statement This Query Builder lets you interactively specify the query you want to run and test it out To use the Query Builder, follow these steps:
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1 Click the Query Builder button (shown in Figure 213) Figure 214 shows the Query Builder in action
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Figure 214 Using Query Builder to Specify a SQL Statement
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The Query Builder is a fairly complicated window At the top is a diagram view pane; here you can add tables or remove them using the right-click pop-up menu The Query Builder adapts its menus and what you are allowed to do depending on whether you entered it to build a SELECT, INSERT, UPDATE, or DELETE statement For example, if you are building a SELECT statement, you can add multiple tables to build a JOIN query However, if you are building an INSERT statement, only one table is allowed
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2 Once a table is displayed, check the boxes next to individual columns to include them in the query statement in the appropriate place based on the query type Below the diagram pane is a grid panethis lets you specify additional qualifiers for each selected column, such as default values and the direction of the parameter Below the grid pane is the SQL statement itself, which dynamically changes based on your entries in the two panes above You can also simply type the SQL text into that pane, and the other panes will update and the focus will change At the bottom is a preview pane, where you can try to execute the query if it returns results to see what the results look like You do this by clicking the Execute button
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6 After you have determined the SQL statement for the query that you want to add, you specify the name(s) of the method(s) that will be added to the table adapter If you chose a SELECT statement that will return rows, and therefore can be used to populate the typed data set associated with the table adapter, you can generate two methods: one to fill the data set based on the query, and another that will construct a new data table, fill it, and return it as a return parameter from the method These methods will default to being selected for generation and will start with a naming convention of FillBy and GetBy, respectively
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Complete the method name with a meaningful addition based on the parameters that you are doing the select with Figure 215 shows this step for the example, where we are performing a SELECT with a Country column WHERE restriction, so I named the methods FillByCountry and GetByCountry If you are specifying one of the other types of queries that don't fill the data set, you will be given a text box to
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specify a single method name for the query method that is generated Click Next to move to the final step of the wizard
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Figure 215 Specifying the Method Name(s) for the Table Adapter Query Methods
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8 Assuming all went well and there were no errors, you will see a final feedback dialog (see Figure 216) that tells you what was done
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Figure 216 Results of Completing the Add Query Wizard
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Configuring a Table Adapter to Use Stored Procedures
If you want to generate a new stored procedure and base the query method on that, the procedure is much the same as what was just covered for a SQL statement You step through the wizard, and specify the SQL statement that the stored procedure should contain The main difference is that when you complete the wizard, the stored procedure will also be created in the database that you are working with If you want to base your query method on an existing stored procedure, the wizard experience is a little different Instead of the step shown in Figure 213 for specifying the SQL statement, the wizards displays the page shown in Figure 217 for choosing the stored procedure from the list of stored procedures in the database that you are connected to Once you select a stored procedure, the dialog fills in and shows you what the parameters are and what result columns will be returned from the execution of that stored procedure