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In this syntax: Table: Represents the table in which the row needs to be inserted Values: Takes the column values for the new row as parameters ColumnN_Value: Represents the value to be inserted in the column with name ColumnN The values must be supplied in the same order as the columns in the table Also, if the data type of a column is Char, VarChar, or DateTime, you need to specify values in quotes For example, to insert a row in the Products table, write the following statements: Insert into Products Values ('P001', 'Baby Food', 25, 1200) Here, it is important to note that for every row that you want to insert in a table, you need to use a separate insert statement So, to insert another row in the Products table, write the following statements: Insert into Products Values ('P002', 'Chocolate', 4.

To set up such a FileReader, or any other service using completion callbacks, you must first define a client interface for callback messages The methods in this interface are substitutes of sorts for the kinds of return types and exceptions that would be associated with procedural versions of the service This usually requires two kinds of methods, one associated with normal completion, and one associated with failure that is invoked upon any exception Additionally, callback methods often require an argument indicating which action completed, so that the client can sort them out when there are multiple calls In many cases this can be accomplished simply by sending back some of the call arguments In more general schemes, the service hands back a unique identifier (usually known as a cookie) both as the return value for the initial request and as an argument in any callback method Variants of this technique are used behind the scenes in remote invocation frameworks that implement procedural calls via asynchronous messages across networks In the case of FileReader, we could use interfaces such as:

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interface FileReader { void read(String filename, FileReaderClient client); } interface FileReaderClient { void readCompleted(String filename, byte[] data); void readFailed(String filename, IOException ex); }

5, 1000) In addition to adding a row to a table, you might need to modify the value in a specific column of a row For example, you might need to modify the price of a specific product in the Products table You use the Update statement to modify specific column(s) of a specific row of a table as follows: Update Table Set ColumnN="Value1" Where ColumnM="Value2" In this statement, the Set clause is used to set the value of a column named ColumnN to "Value1" where the column named ColumnM has a value "Value2" For example, to update the price of a product whose ID is P001, use the following statement: Update Products Set UnitPrice=25 Where ProductID="P001" You might also need to delete a specific row in a table For example, you might need to delete a specific product in the Products table.

There are two styles for implementing these interfaces, depending on whether you'd like the client or the server to create the thread that performs the service Generally, if the service can be useful without running in its own thread, then control should be assigned to clients In the more typical case in which the use of threads is intrinsic to completion callback designs, control is assigned to the service method Note that this causes callback methods to be executed in the thread constructed by the service, not one directly constructed by the client This can lead to surprising results if any code relies on thread-specific properties such as ThreadLocal and javasecurityAccessControlContext (see 232) that are not known by the service Here we could implement a client and server using a service-creates-thread approach as:

class FileReaderApp implements FileReaderClient { Fragments protected FileReader reader = new AFileReader();

To do so, you use the Delete statement as follows: Delete From Table Where ColumnN="Value" Stored procedures A stored procedure is a set of SQL statements used to perform specific tasks A stored procedure resides on the SQL server and can be executed by any user who has the appropriate permissions Because the stored procedures reside on the SQL server, you do not need to transfer SQL statements to the server each time you want to perform a task on the server This reduces the network traffic When you want to execute a procedure, you only need to transfer the name of the procedure However, if the procedure takes any parameters, you also need to transfer the parameters along with the procedure name You can create a stored procedure by using the Create Procedure statement as follows: Create Procedure ProcName As SQL statements Return.

public void readCompleted(String filename, byte[] data) { // use data } public void readFailed(String filename, IOException ex){ // deal with failure } public void actionRequiringFile() { readerread("AppFile", this); } public void actionNotRequiringFile() { } } class AFileReader implements FileReader { public void read(final String fn, final FileReaderClient c) { new Thread(new Runnable() { public void run() { doRead(fn, c); } })start(); } protected void doRead(String fn, FileReaderClient client) { byte[] buffer = new byte[1024]; // just for illustration try { FileInputStream s = new FileInputStream(fn); sread(buffer); if (client != null) clientreadCompleted(fn, buffer); } catch (IOException ex) { if (client != null) clientreadFailed(fn, ex); }

The service class here is written to deal with a null client argument, thus accommodating clients that do not need callbacks While this is not particularly likely here, callbacks in many services can be treated as optional As an alternative, you could define and use a NullFileReaderClient class that contains no-op versions of the callback methods (see Further Readings) Also, as far as the service is concerned, the callback target might as well be any object at all, for example some helper of the object that requests the service You can also replace callbacks with event notifications using the techniques illustrated in 3116 4313 Guarding callback methods In some applications, clients can process completion callbacks only when they are in particular states Here, the callback methods themselves should contain guards that suspend processing of each incoming callback until the client can deal with it For example, suppose we have a FileReaderClient that initiates a set of asynchronous file reads and needs to process them in the order issued This construction mimics how remote invocations are usually handled: Typically each request is assigned a sequence number, and replies are processed in sequence order This can be a risky strategy, since it will cause indefinite never completes This drawback could be addressed by associating time-outs with the waits

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