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What is not acceptable is that one side of the JOIN names a column and on the other side is a variable or literal that is really a filter that would be found in a WHERE statement Joining two tables together can become quite complicated The most basic join condition is a straight join between two tables, which is called an INNER JOIN An INNER JOIN will join the two tables, and where there is a join of data using the columns from each of the two tables, then the data will be returned For example, if there is a share in the shares table that has no price and you are joining the two tables on the share ID, then you would only see output where there is a share with a share price You will see this in action in this chapter.

The statement sp_helptext is a predefined SQL Server stored procedure that accepts an object name as a parameter and shows the definition of that passed object: Execute sp_helptext 'sp_Select_All_Employees'

The output looks like this:

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It is possible to return all the rows from one table where there is no join This is known as an OUTER JOIN Depending on which table you want the rows always to be returned from, this will either be a LEFT OUTER JOIN or a RIGHT OUTER JOIN Taking our shares example, we could use an OUTER JOIN so that even when there is no share price, we can still list the share This example will also be demonstrated later in this chapter The final type of join is the scariest and most dangerous join If you wish for every row in one table to be joined with every row in the joining table, then you would use a CROSS JOIN So if you had 10 rows in one table and 12 rows in the other table, you would see returned 120 rows of data (10 12).

public void invocationRequestNotify(ContentHandlerServer queue) { Invocation incoming = queue.getRequest(true); String source = incoming.getInvokingID(); if (queue.isAccessAllowed(source)) { // Process the request } else { int count = queue.accessAllowedCount(); System.out.println("Only the following IDs are allowed:"); for (int i = 0; i < count; ++i) { System.out.println(queue.getAccessAllowed(i)); } } }

Using Ant for compilation Packaging beans into an ejb.jar file Generating stub classes Unit-testing stateless session beans Unit-testing stateful session beans Unit-testing an entity bean Automating test cases Executing test cases

As you can imagine, this type of join just needs two small tables to produce even a large amount of output Although not the most helpful of syntax demonstrated within the book, the syntax for joining two tables is as follows: FROM tablea [FULL[INNER|OUTER|CROSS]] JOIN tableb {ON tablebcolumn1 = tableacolumn2 {AND|OR tablebcolumn..}} The best way to look at the syntax is within a described example We will use two tables to demonstrate the inner join in this example, ShareDetailsShares and ShareDetailsSharePrices Joining two tables could not be simpler All the columns in both tables are available to be returned through the query, and so we can list the columns desired as normal However, if there are two columns of the same name, they must be prefixed with the name, or the alias name, of the table from which the information is derived..

Behind the scenes, the ChangeWatcher class is used in the BindingUtils class to allow the usage of weak references, which means that you can set the weak reference to true and allow the host to be picked up by the garbage collector. This avoids any potential memory leaks. Although you can use weak references, as we pointed out, the ChangeWatcher needs to be un-watched once you are complete and it s your responsibility to handle that task which will ensure there are no memory leaks. The best way to handle this is to assign the static method to a ChangeWatcher variable. The static method returns a ChangeWatcher instance, so you can assign it to a variable, and once you don t need to bind the object anymore you can use the unwatch, as you can see in the following code along with Figure 2-4.

Within an XML configuration file you name List_Of_App_Type.xml, insert the XML shown in Listing 3 12, and insert an appType node for each system that will have static cross-references. Listing 3 12. List_Of_App_Type.xml < xml version="1.0" encoding="UTF-8" > <listOfAppType> <appType> <name>Oracle</name> <description/> </appType> <appType> <name>Siebel</name> <description/> </appType> </listOfAppType>

Middlegen now also reads (and generates code for) the BID table (and the relationships between ITEM and BID). The table element is independent of the many2many; you can use it alone to specify the subset of tables in a schema for which mapping metadata should be generated. The table element has attributes for further customization, such as a setting for singular and plural names (useful for automatic property naming in associations for example, Item.getCategorys() versus Item.getCategories()). The few other options are rarely used; you can find a description in the Middlegen documentation.

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