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	Design Patterns: Data Access Object
		The DAO pattern allows data access mechanisms to change independently of the code that uses the data.
		The simplest (but least flexible) way to implement a data access object is to write it as a class.
		The data access mechanism can be changed easily by writing a new class that implements the same interface, and changing client code to use the new class.
	java.sun.com /blueprints/patterns/DAO.html (1335 words)

	Core J2EE Patterns: Data Access Object
		Access to data varies depending on the source of the data.
		Access to persistent storage, such as to a database, varies greatly depending on the type of storage (relational databases, object-oriented databases, flat files, and so forth) and the vendor implementation.
		Because all data access operations are now delegated to the DAOs, the separate data access layer can be viewed as the layer that can isolate the rest of the application from the data access implementation.
	www.corej2eepatterns.com /Patterns/DataAccessObject.htm (2794 words)

	Data Access Object - Wikipedia, the free encyclopedia
		In computer software, a Data Access Object (DAO) is a software component which provides a common interface between the application and one or more data storage devices, such as a database or file.
		The advantage of using data access objects is that any business object (which contains application or operation specific details) does not require direct knowledge of the final destination for the information it manipulates.
		Data Access Objects can be used in Java to insulate an application from the underlying Java persistence technology, which could be JDBC, JDO, EJB CMP, TopLink, Hibernate, iBATIS, or any one of a range of technologies.
	en.wikipedia.org /wiki/Data_Access_Object (323 words)

	A stepped approach to J2EE testing with SDAO
		The goal of the Data Access Object pattern is to provide a single point of contact to a particular data source.
		Data access objects are responsible for operating on objects that hold data stored in a relational database.
		The first DAO I build is the "default" DAO; it goes to an in-memory collection of DTOs, then gets passed off to the team building the upper layers of the application (Servlets and JSP files, for instance).
	www-106.ibm.com /developerworks/java/library/j-sdao (1877 words)

	Use Callbacks to Isolate Concurrency Bugs
		When the callback object is done using the data, the gatekeeper passes the data to the next callback object.
		A callback, on the other hand, cannot access the data until that data is passed to the method, and it cannot access the data after the method is finished.
		Of course, you easily could protect c by hiding it behind a synchronized access method, but as mentioned previously, this article's purpose is to explore an alternative method of data protection, one you would use when regular synchronization is either difficult or undesirable.
	www.devx.com /Java/Article/28156/1954?pf=true (1816 words)

	Table Data Gateway vs. Data Access Object
		In general, the idea of having a data access layer is all that these patterns are trying to portray.
		I sometimes feel a DAO is overkill because a DAO is usually accompanied by a Factory.
		One of the forces for DAO's is: "You want to provide a uniform data access API for a persistent mechanism to various types of data sources, such as RDBMS, LDAP, OODB, XML repositories, flat files, and so on." (from the Core J2EE Patterns book).
	geekswithblogs.net /flanakin/archive/2004/03/08/2633.aspx (2307 words)

	A Primer on Spring's Data Access Object (DAO) Framework
		Data Access Object (DAO) is an integration tier design pattern as cataloged in the book Core J2EE Design Pattern.
		The flexibility the DAO design pattern provides is attributed primarily to a best practice for object design: Program to an Interface (P2I).
		The DAO Factory is a typical factory design pattern implementation for creating and serving concrete DAO implementations to the business objects.
	dev2dev.bea.com /pub/a/2006/10/spring-jdbc-dao.html (1077 words)

	Core J2EE Patterns
		Data access objects in their most basic form use transfer objects to transport data to and from their clients.
		The DAO pattern more specifically applies this pattern to decoupling the resource tier from clients in another tier, such as the business or presentation tier.
		The Transfer Object Assembler uses the Data Access Object to obtain data to build the composite transfer object it needs to assemble and send as the model data to the client.
	www.corej2eepatterns.com /Patterns2ndEd/DataAccessObject.htm (395 words)

	Java Practices: Data access objects
		This issue does not exist in Styles 1 and 2, where the DAO is created on the stack, and is not shared between threads.
		Implementing the full Data Access Object pattern takes more work, but it is worthwhile when multiple persistence mechanisms need to coexist.
		objects to be fetched (this is a simple DAO interface, since only a fetch operation is defined).
	www.javapractices.com /Topic66.cjp (1290 words)

	oreilly.com -- Online Catalog: Access Database Design & Programming
		Access makes it so easy -- and so visually attractive -- to create databases that users are strongly tempted to create the tables of a database without designing them beforehand.
		The attractive query design dialog that Access provides tends to obscure the fact that the Access interface can be used for some kinds of queries but does not support others.
		Rather than covering these object models in an encyclopedic fashion, the section serves as a handy introduction and primer for basic database operations, like: modifying a table under program control, dynamically adding and deleting a record, or repositioning a record pointer.
	www.oreilly.com /catalog/accessdata (805 words)

	Data Transfer Object - Wikipedia, the free encyclopedia
		Data Transfer Objects (DTO), also known as Value Objects or VO, are a software design pattern used to transfer data between software application subsystems.
		DTO's are often used in conjunction with Data Access Objects to retrieve data from a database.
		The difference between Data Transfer Objects and Business Objects or Data Access Objects is that DTOs do not have any behaviour except for storage and retrieval of its own data (mutators and accessor).
	en.wikipedia.org /wiki/Data_Transfer_Object (113 words)

	Advanced DAO programming
		One approach makes the DAO responsible for demarcating transactions; the other defers transaction demarcation to the object that is calling the DAO's methods.
		DAOs that ignore caught exceptions are difficult to troubleshoot.
		The Dragonslayer tutorial "Create persistent application data with Java Data Objects" (developerWorks, July 2003) shows you how to combine Struts and the DAO pattern for low-impact enterprise data persistence.
	www-106.ibm.com /developerworks/java/library/j-dao (2487 words)

	dev2dev: A Primer on Spring's Data Access Object (DAO) Framework
		It is noteworthy that the Spring DAO exceptions are independent of the data access implementation.
		The DAO code is fragile and would have to change to cater to modified requirements.
		Spring DAO or the JDBC framework was introduced to address the demerits of traditional DAO.
	dev2dev.bea.com /lpt/a/535 (3128 words)

	Sample Chapter from OOP: Building Reusable Components with MicrosoftÂ® Visual BasicÂ® .NET by Ken Spencer, Tom ...
		Data access has evolved over the years, and the result of this process is ADO.NET.
		The data access object is also going to give us a consistent way of interacting with data.
		It might actually be possible, for a change, to remember the code for accessing data and not to have to fight with the minor code differences of the past (minor difference but major pain, I might add).
	www.microsoft.com /mspress/books/sampchap/5203.aspx (4412 words)

	iBATIS Data Access Objects (Site not responding. Last check: 2007-10-13)
		iBATIS Data Access Objects is an abstraction layer that hides the details of your persistence solution and provides a common API to therest of your application.
		Data Access Objects allow you to create simple components that provide access to your data without revealing the specifics of the implementation to the rest of your application.
		For Java users, the Data Access Objects framework is bundled as part of the iBATIS Database Layer, which includes the SQL Maps Framework.
	ibatis.apache.org /dao.html (175 words)

	Data Access Object
		The Data Access Object design pattern provides a technique for separating object persistence and data access logic from any particular persistence mechanism or API.
		It is important to note that Data Access Object does not just apply to simple mappings of one object to one relational table, but also allows complex queries to be performed and allows for stored procedures and database views to be mapped into Java data structures.
		CodeFutures' objective is to minimize the importance of the main argument against using Data Access Objects: the fact that it requires a significant amount of repetitive source code to be produced for no immediate advantage over using JDBC, EJB, or JDO directly.
	www.codefutures.com /data-access-object (849 words)

	Download DAO ( Data Access Object ) -Generator 1.2 - DAO-Generator(Data Access Object Generator) - Soft32.com
		"DAO (Data Access Object) Generator" generates high quality source code for the Data Access Layer in service-oriented and object-oriented architecture for accessing relational database schemas.
		Then, the DAO implementation, which contains the exception class and the value object (data transfer object), as well as the DAO factory interface, which includes the primary key class, the record count class, and the record count interface and implementation.
		It follows the Data Access Object design pattern and generates complete and extremely thorough classes for the data access layer.
	www.soft32.com /download_122845.html (755 words)

	MS Access Software Tips
		This way, users who need to access the data can customize their own forms, reports, and other objects while maintaining a single source of data on the network.
		Have data that is mostly of the long text string type (not numbers or defined as numbers).
		If you embed the object, it becomes part of the database and if you make changes to the object from the original source (for example an Image file changed in Photoshop), these changes will not be reflected in Access.
	www.ecs.psu.edu /training/Software_Tips/Access.htm (4112 words)

	Data Access Object (Site not responding. Last check: 2007-10-13)
		Adapt and encapsulate all access to the data source.
		Solve differences in the APIs which is used to access different persistent storage mechanisms.
		transfer object -- used to transport data to and from its clients.
	www.javacamp.org /designPattern/dao.html (124 words)

	Best free data access object downloads. Create Database Applications in record time! .NET component drawing graphs from ...
		This tool can be used for generating base code (data access layer, business logic layer, presentation layer, startup project) for multi-tier applications which work with databases.
		Data model output, in the form of SQL, can be run in an RDBMS to produce entity-relationship diagrams.
		Lattice.DataMapper bridges the gap between objects and data source and allows the developer to work at the object level with little knowledge of the data source.
	www.freedownloadmanager.org /downloads/data_access_object_software (613 words)

	Run-time Error '424': Object Required Using DAO
		The Data Access Object files are missing, damaged, or improperly registered.
		Before you proceed with the steps to replace the Data Access Object files, test the Data Access Object engine with a macro to ensure that it is working.
		If you installed Data Access Object multiple times, (this can occur when you install multiple programs), you must edit the registry so that the Data Access Object components are removed when you remove Microsoft Office.
	support.microsoft.com /kb/163475 (1010 words)

	Casabac Data Access - OBJECT International Software (Site not responding. Last check: 2007-10-13)
		Casabac Data Access is a light-weight application to access and control persistent data.
		The application is designed to control the master data objects of business applications that do not have an own customization tool.
		Both the hierarchy inside the "Table Area" as well as the used layouts inside the "Detail Area" can be easily configured to meet your view on the persistent data.
	www.oisoft.com /index.pl/casabac/data-access_save (211 words)

	Data Access Worldwide - Software products and services for building better business solutions
		Data Access in Miami is upgrading telephone service today, and there may be intermittent disruptions to the service.
		Data Access Worldwide delivers advanced products and services to help customers build great database applications and get more value from their data.
		With offices worldwide, industry leading partners and a broad array of expert vertical market solution providers using our tools and technology, Data Access Worldwide is the center of a community of resources experienced in delivering open solutions for a changing world.
	www.dataaccess.com (232 words)

	ONLamp.com -- Simplify Business Logic with PHP DataObjects
		Using a data abstraction layer is a good thing, but its main goal is to make the RDBMS transparent, allowing you to change database vendors fairly easily.
		This is where having a separate data access layer can help out.
		These patterns can be quite complex, but with a little imagination, we can use their fundamental ideas and purpose to make our own data layer in PHP 5 much easier to work with.
	www.onlamp.com /pub/a/php/2004/08/05/dataobjects.html (790 words)

	JDBC PreparedStatement, JNDI DataSource, Data Access Object, DAO, Java
		By this Java API, a few lines of codes are enough for your DAO (Data Access Object).
		Once the intended object is looked up, this class keeps its reference in the cache.
		As you see, the source code of your DAO (Data Access Object) can be free from JNDI/JDBC related stuff and be very simple.
	www.oop-reserch.com /simple_dao.html (932 words)

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