Data access patterns: database interactions in by Clifton Nock

Posted by

By Clifton Nock

Effective, top of the range info entry code is essential to the functionality and value of just about any firm application-and there isn't any larger method to enhance an latest method than to optimize its information entry code. despite database engine, platform, language, or software, builders again and again come across a similar relational database entry demanding situations. In information entry styles, Clifton Nock identifies 25 confirmed strategies, featuring every one within the type of a transparent, easy-to-use trend. those styles resolve an extremely wide selection of difficulties together with growing effective database-independent functions, hiding vague database semantics from clients, rushing database source initialization, simplifying improvement and upkeep, enhancing help for concurrency and transactions, and taking away information entry bottlenecks.

Show description

Read Online or Download Data access patterns: database interactions in object-oriented applications PDF

Best data modeling & design books

IP Routing Fundamentals

A accomplished ntroduction to routing ideas and protocols in IP networks. * accomplished assessment of the operational mechanics of cutting-edge major routing protocols, together with IGRP, EIGRP, OSPF, RIP, and RIP-2 * distinct rationalization of IP addressing, together with classful and classless addresses, subnetting, supernetting, Classless Interdomain Routing (CIDR), and Variable size Subnet mask (VLSM) * Side-by-side comparisons of assorted LAN segmentation applied sciences, together with bridges, switches, and routers * Exploration of the way routers are used to construct large region networks * exam of the way forward for routing, together with IPv6, subsequent iteration routing protocols, host-based routing, and IP SwitchingIP Routing basics is the definitive advent to routing in IP networks.

Beautiful Data

During this insightful booklet, youll examine from the simplest info practitioners within the box simply how wide-ranging -- and gorgeous -- operating with facts should be. subscribe to 39 individuals as they clarify how they built easy and stylish options on tasks starting from the Mars lander to a Radiohead video. With appealing info, you are going to: discover the possibilities and demanding situations thinking about operating with the monstrous variety of datasets made on hand through the net the way to visualize developments in city crime, utilizing maps and knowledge mashups realize the demanding situations of designing a knowledge processing procedure that works in the constraints of area trip learn the way crowdsourcing and transparency have mixed to enhance the kingdom of drug study know how new info can instantly set off signals whilst it suits or overlaps pre-existing facts know about the big infrastructure required to create, seize, and method DNA information Thats simply small pattern of what youll locate in attractive facts.


Metaheuristics convey fascinating houses like simplicity, effortless parallelizability, and prepared applicability to types of optimization difficulties. After a accomplished creation to the sphere, the contributed chapters during this e-book comprise causes of the most metaheuristics options, together with simulated annealing, tabu seek, evolutionary algorithms, man made ants, and particle swarms, by means of chapters that show their functions to difficulties similar to multiobjective optimization, logistics, motor vehicle routing, and air site visitors administration.

Extra info for Data access patterns: database interactions in object-oriented applications

Sample text

This process requires the following database operations: 1. Get a list of all employees for whom expense reimbursements are due. 2. For each employee in this list, get a list of active expenses reported. 3. Issue the employee a check for the total. 4. Reset the employee's expense status. 5. Delete the employee's active expense records. The application logic for this process is straightforward. It does not stray much from the steps listed here. However, its code has the potential to be the opposite.

Public class CustomerList { private static final String QUERY = "SELECT * FROM CUSTOMERS"; private List contents = new LinkedList(); /** Constructs a CustomerList object that represents every customer in the database. close(); } catch(SQLException e) { throw new DataException( "Unable to read customer list", e); } } /** Returns an iterator that lists every customer in the list. iterator(); } } This block illustrates application code that issues catalogs to every customer in the database. Notice again that this code was written exclusively in terms of active domain objects.

If the model's inconsistencies are just a cosmetic problem and the tables are not lacking any functional or relational information, then changing the data model may not be the best decision. 1. The CUSTOMERS and EMPLOYEES tables and the domain objects that model them. 46 Part 1: Decoupling Patterns Part 1: Decoupling Patterns 47 You can choose to access these tables directly within application code whenever application logic dictates a need for them. However, the data model's inconsistencies will quickly spread throughout the application code.

Download PDF sample

Rated 4.16 of 5 – based on 38 votes