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JDBC and Embedded SQL
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follows the same rules that apply to the ANY test (see previous section) Listing 11-93 contains the DownRow() method that can be used with Listing 11-97
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Listing 11-97 Performing the ALL test
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try { String query = new String (" SELECT DISTINCT Store " + " FROM Sales "+ " WHERE Estimate > ALL " + " (SELECT Amount" + " FROM Orders " + " WHERE StoreNumber = StoreNum) "); DataRequest = DatabasecreateStatement(); Results = DataRequestexecuteQuery (query); Systemoutprintln("Store"); Systemoutprintln("-----"); DisplayResults (Results); DataRequestclose(); } J2ME DATA MANAGEMENT
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You can reduce the complexity of your J2ME application by creating one or more views of the database for each user ID that is passed to the J2ME application for data access A VIEW is similar to creating a table that contains only data the user ID is permitted to access A VIEW limits columns and rows that can be queried to specific information pertaining to a user ID A VIEW is like a filter that hides information from a user ID Each VIEW is uniquely identified with a name and contains selection criteria for columns and rows that appear in the VIEW when the VIEW is used by a J2ME component Once a VIEW is created, the J2ME application references a VIEW the same way that a table is referenced in a query
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Rules for Using VIEWs
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In many situations, using VIEWs increases the efficiency of interacting with tables in a database However, there are times when VIEWs are not appropriate for an application The following is a set of rules that govern how you should use VIEWs in your application: Create as many VIEWs as necessary to simplify access to a database Restrict access to a table on need-to-know basis Work with the owner of the data to establish reasonable restrictions Classify users into groups that have similar access requirements to information Create a VIEW for each classification of user rather than for each user
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More than one column can be used in a VIEW More than one table can be used in a VIEW A VIEW is treated as a table in a query regardless of the number of columns and tables that are used to create the VIEW Use a VIEW whenever your program accesses some columns in many tables The view simplifies the number of tables that a J2ME application needs to access directly Beware of data security restrictions that affect the underlying columns and tables used to create the VIEW A VIEW inherits data security restrictions from tables used to create the VIEW Therefore, if the user ID doesn t have rights to information in a table, the VIEW also has the same restrictions Create as many VIEWs as necessary to simplify access to a database However, querying a VIEW is not necessarily an efficient way to query a database The following sections illustrate how to create and use a VIEW You can execute code segments within each section using the Model A program Before doing so, create the following tables and insert the rows shown in Table 11-19 and Table 11-20 Define the Orders table as follows: OrderNumber, number, primary key ProdNumber, number CustomerNumber, number StoreNum, number Amount, long
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OrderNumber
122 334 365 534 555 717 874
ProdNumber
5237 3255 3255 7466 1052 1052 7466
CustomerNumber
591 901 901 591 999 721 721
StoreNum
345 278 278 825 278 825 825
Amount
200 321 433 523 23 75 354
Table 11-19
Sample Entries in an Orders Table for Practice Using VIEWs
11:
JDBC and Embedded SQL
ProductNumber
1052 3255 5237 7466 Table 11-20
ProductName
CD Player VCR DVD Player 50-inch TV
UnitPrice
100 250 325 532
Sample Entries in a Products Table for Practice Using VIEWs
Define the Products table as follows: ProductNumber, number, primary key ProductName, VARCHAR UnitPrice, long
J2ME DATA MANAGEMENT
Create a VIEW
A VIEW is created by using the CREATE VIEW statement, as illustrated in Listing 11-98 In this example, the CREATE VIEW statement contains the name of the VIEW, which is Store278 Any unique name can be used as the name of a VIEW The AS modifier contains the query whose results form the rows and columns that are contained in the VIEW In this example, all the columns and rows of the Orders table where the value of the StoreNum column is 278 are placed in the VIEW Only rows that pertain to store 278 are contained in the VIEW Data from all other stores is excluded
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