modifying databases in vwd
Tài liệu Modifying Rows in a DataTable phần 1 ppt
... database. Next, the following example sets the InsertCommand property of mySqlDataAdapter to myInsertCommand: mySqlDataAdapter.InsertCommand = myInsertCommand; Setting the UpdateCommand Property ... one wins" concurrency. To use optimistic concurrency, you have to do the following in your UPDATE or DELETE statement's WHERE clause: 1. Include all the columns used in the original ... a DataRow using the BeginEdit() method. Setting the DeleteCommand Property of a DataAdapter The following example creates a SqlCommand object named myDeleteCommand that contains a DELETE...
- 7
- 450
- 1
Tài liệu Modifying Rows in a DataTable phần 2 docx
... by the method call. In this example, one is returned since one row was added. Modifying a DataRow in a DataTable To modify a DataRow in a DataTable, you use the following steps: 1. Set the ... dataTableName is a string containing the name of the DataTable to update. The int returned by the Update() method is the number of rows successfully updated in the database. Going back to the previous ... need to set this to find the DataRow in the next step. 2. Use the Find() method to locate the DataRow that you want to modify in your DataTable. You locate the DataRow using the value of its...
- 7
- 391
- 1
Tài liệu Managing time in relational databases- P1 ppt
... data in which none of that isnecessary, a world in which all pipeline datasets are contained in the single table that is their destination or their point of origin. In this world, maintaining ... systems used in education,finance, health care, insurance, manufacturing, retailing andtransportation—all industries in which the authors have hadconsulting experience. In using these methods, ... along inflow pipelines, and posted transactionsas data destined for some kind of logfile, and as moving towardsthat destination along outflow pipelines. So if we can bringpending transactions into...
- 20
- 372
- 1
Tài liệu Managing time in relational databases- P2 pptx
... management losingfaith in data warehouse projects. As these large projects fellincreasingly behind schedule and rose increasingly over budget—something large projects tend to do—the pressure increasedto ... firstrestoring them from off-line storage media. After that, the nextstep was to realize that there was value, not just in having a par-ticular set of backup data remain on-line, but also in having ... columns. In addition, developers were also beginning to create on-linetransaction tables by bringing collections of transactions backfrom off-line storage media, transactions that originally...
- 20
- 399
- 1
Tài liệu Managing time in relational databases- P3 doc
... point in time forward to the point in time we are interested in. But the defining feature of reconstructable methods is not themovement of data from off-line to on-line storage. The defining ... waiting for the data, and the decisionsdelayed until the data becomes available. In an increasinglyfast-paced business world, the opportunity cost of delays in accessing data is increasingly ... anypoint in time between the starting balance and the current bal-ance by going back to the starting balance and applying trans-actions, in chronological sequence, up to the desired point.We...
- 20
- 436
- 1
Tài liệu Managing time in relational databases- P4 pptx
... by also inter-nalizing them within their target tables. In this book, we willshow how the use of these internalized managed objects reducesthe costs of maintaining databases by replacing external ... designing andmaintaining data models that must explicitly define temporaldata structures and integrity constraints on them. It alsorelieves developers of the burden of designing, writing andmaintaining ... lacking a standard for the PERIOD datatype, wewill continue the practice of defining periods of time in terms of their begin and endpoints in time.Chapter 3 THE ORIGINS OF ASSERTED VERSIONING:...
- 20
- 420
- 1
Tài liệu Managing time in relational databases- P5 pptx
... just one kind of internalized pipelinedataset, and the internalization of pipeline datasets can eliminatea large part of the IT maintenance budget by eliminating the needto manage pipeline datasets ... perhaps joining data that the productionqueries did not have to join, perhaps assembling intermediateresults and then combining those intermediate results in variouscomplicated ways. In short, ... isthe SQL statement that inserted or most recently altered the data in that table. In each table, primary key columns are indicated by under-lining their column headings. In each table, the italicized...
- 20
- 420
- 1
Tài liệu Managing time in relational databases- P6 pptx
... objects monitored byinstruments, such as atomic nuclei or automobile engines. Theobjects that businesses are interested in generally fall in themid-range in terms of being static or dynamic.Both ... a business user saysthat a policy should be deleted, she is (or should be) making abusiness statement. She is saying that as of a given point in time,the policy is no longer in effect. In a ... semanticconstraints on bi-temporal data as that data is maintained,Asserted Versioning makes queries against its tables nearly aseasy to write as queries against conventional tables. In the final section...
- 20
- 485
- 1
Tài liệu Managing time in relational databases- P7 pdf
... truth.Temporal Integrity ConstraintsThe three integrity constraints in relational theory are entityintegrity, referential integrity and domain integrity. Entity integ-rity insures that the ... present an in- line notation for single assertedManaging Time in Relational Databases. Doi: 10.1016/B978-0-12-375041-9.00006-6Copyright#2010 Elsevier Inc. All rights of reproduction in any form ... businessdata in a row is no longer in effect. In other words, the datewhich is one clock tick past the last date on which the businessdata in a row is in effect.Asr-beg. Assertion begin date....
- 20
- 419
- 1
Tài liệu Managing time in relational databases- P8 pptx
... withinshared assertion time, even a single effective-time clock tickincluded in another version of that object already in the table.Most physical transactions against bi-temporal tables areinserts. ... are known. Perhaps in another insurance company,all policies stop being in effect at the end of each calendar year. In that case, instead of an effective end date of 12/31/9999 in rows 1 and 3, ... with, the possibility of misinterpretation,on the maintenance side of things, is minimized.But what about the query side of things? What about lookingat the data in an asserted version table?...
- 20
- 430
- 1
Tài liệu Managing time in relational databases- P9 pdf
... SCENARIO 153PART3DESIGNING, MAINTAININGAND QUERYING ASSERTEDVERSION DATABASES Chapter Contents8. Designing and Generating Asserted Versioning Databases 1679. An Introduction to Temporal ... referential integrity on those tables.If ERwin is used as the data modeling tool, then a set of ERwin162 Part 3 DESIGNING, MAINTAINING AND QUERYING ASSERTED VERSION DATABASES Note that, like all temporal ... of “filling in the gap” between those two episodes,merging them into a single episode. In this chapter, however, weassume that our temporal insert creates a new episode.An episode begin date...
- 20
- 249
- 1
Tài liệu Managing time in relational databases- P10 docx
... Table.Chapter 8 DESIGNING AND GENERATING ASSERTED VERSIONING DATABASES 1738DESIGNING AND GENERATINGASSERTED VERSIONING DATABASES CONTENTSTranslating a Non-Temporal Logical Data Model into a TemporalPhysical ... that each business keypoints to one and only one object by defining a unique indexon it. Nor can we simply extend the scope of the index by defin-ing a unique index on the business key plus ... thatcorrespond to rows in a conventi onal table of persistent objects.164 Part 3 DESIGNING, MAINTAINING AND QUERYING ASSERTED VERSION DATABASES In this chapter, we focus on index design, although...
- 20
- 275
- 1
Tài liệu Managing time in relational databases- P11 doc
... significantly reduces the work involved in maintainingtemporal data, and will eliminate the errors that would otherwiseinevitably happen as temporal data is maintained.Using a framework like the ... taxonomy in terms of its topology. On a line representing atimeline, we can place a line segment representing an episode.We can also remove a line segment from that line. Given a linesegment, ... archives atInformation_Management.com (formerly DM Review), with links listed in thebibliography.188 Chapter 8 DESIGNING AND GENERATING ASSERTED VERSIONING DATABASES Typically, a single standard...
- 20
- 368
- 1
Tài liệu Managing time in relational databases- P12 pdf
... will continue on, and willupdate the database. In doing so, it will begin by preserving theoriginal state of the version or versions about to be changed,doing this by withdrawing them into past ... shown in Figure 10.3.Episode C, as we have labeled it, is a single-version episode.Ofcourse allepisodes, when initially created, are single-versionepisodes. Using the in- line notation introdu ... or a referentialintegrity constraint, it will reject that transaction. In response,the AVF will stop processing the temporal transaction, undoManaging Time in Relational Databases. Doi: 10.1016/B978-0-12-375041-9.00010-8Copyright#2010...
- 20
- 294
- 1
Tài liệu Managing time in relational databases- P13 pdf
... temporaldeletes as well. In addition, instead of requiring the user to write trans-actions in a proprietar y format required by an ApplicationProgramming Interface (API) we were developing, the AVFnow ... episode.Splitting an Episode{Splitting} an episode is a little more interesting than either{shortening an episode backwards} or {shortening an episode for-wards}. The reason is that, from the point ... resulting episodes, {splitting} is {shortening an episodebackwards}, while from the point of view of the later of the tworesulting episodes, it is {shortening an episode forwards}. Fromthe point...
- 20
- 348
- 1
Tìm thêm: xác định các mục tiêu của chương trình khảo sát các chuẩn giảng dạy tiếng nhật từ góc độ lí thuyết và thực tiễn khảo sát chương trình đào tạo gắn với các giáo trình cụ thể xác định thời lượng học về mặt lí thuyết và thực tế tiến hành xây dựng chương trình đào tạo dành cho đối tượng không chuyên ngữ tại việt nam điều tra đối với đối tượng giảng viên và đối tượng quản lí điều tra với đối tượng sinh viên học tiếng nhật không chuyên ngữ1 khảo sát thực tế giảng dạy tiếng nhật không chuyên ngữ tại việt nam khảo sát các chương trình đào tạo theo những bộ giáo trình tiêu biểu nội dung cụ thể cho từng kĩ năng ở từng cấp độ xác định mức độ đáp ứng về văn hoá và chuyên môn trong ct phát huy những thành tựu công nghệ mới nhất được áp dụng vào công tác dạy và học ngoại ngữ mở máy động cơ lồng sóc các đặc tính của động cơ điện không đồng bộ hệ số công suất cosp fi p2 đặc tuyến mômen quay m fi p2 sự cần thiết phải đầu tư xây dựng nhà máy thông tin liên lạc và các dịch vụ phần 3 giới thiệu nguyên liệu chỉ tiêu chất lượng theo chất lượng phẩm chất sản phẩm khô từ gạo của bộ y tế năm 2008