updating a primary key value

... the UpdateCommand of the DataAdapter needs to locate the row based on the original primary key and update the primary key value with the current value of the primary key in addition to updating ... Primary Key Value Problem You changed a primary key value in a DataTable and updated the change back to the underlying data source, but the value in the data source remained unchanged. You ... update a primary key value in the data source underlying the DataTable. Solution Use the SourceVersion property of SqlParameter to update the primary key value in the data source. The schema...

Ngày tải lên: 26/01/2014, 10:20

... DataTable. This is the default. None Indicates that no action takes place. SetDefault Indicates that the DataColumn values in the child DataTable are to be set to the value in the DefaultValue ... parent table. Updating the Primary Key of a Parent Table and Pushing the Change to the Database In this section you'll learn what happens if you attempt to update the primary key in a ... primary key value in the Customers table are not cascaded to the Orders table. This is the default. • Checked, meaning that changes to the CustomerID primary key value in the Customers table...

Ngày tải lên: 24/12/2013, 01:17

... each record, such as a Customer ID. This How-To discusses what the best candidates are for primary keys, as well as how to create them and other indexes. You have created a base table and have ... Indexes are used to improve performance when querying data, such as searching on fields and sorting information. The primary key is an index that ensures that you have at least one unique value ... entered data into it. How do you make sure that you have a way of finding specific records? LastName and FirstName fields won't work because you can have duplicates of those. You also want...

Ngày tải lên: 14/12/2013, 20:16

... DataTable parentTable = new DataTable(PARENTTABLENAME); cols = parentTable.Columns; col = cols.Add(PARENTID_FIELD, typeof(Guid)); col.DefaultValue = Guid.NewGuid( ); parentTable.PrimaryKey ... the DataSet and create the relationship. ds = new DataSet( ); Table 4-2. DataRowAction enumeration Value Description Add The row has been added to the table. Change The row has been changed. ... be changed after each row is added to the table so that each row has a different GUID primary key value. This is done by handling the RowChanging event for each table. When a row has been added,...

Ngày tải lên: 21/01/2014, 11:20

... must have taken b. must have been taken c. can't have been taken d. can't have taken 29. The garden ________. It has just started raining. a. needn't water b. needn't be watered c. ... reviewed 12. As for me, I consider reading ________ important part of ________ life. a. an / Ø b. the / a c. Ø / the d. an / a 13. Anne says that she reads about half ________ hour a day, at least. a. a ... because a pack of sharks follow the trail to Santiago's boat ________. a. so that the marlin is bitten largely by each of them b. it is taken an enormous bite by each shark c. and each shark...

Ngày tải lên: 23/07/2013, 01:25

... by d. Taliban -> b 9. You are many more intelligent than I thought you are. a. many b. than c. thought d. are -> a III. Grammar and Vocabulary 10. Public libraries to all readers. a. open b. ... winner of the art competition a prize. a. awarded b. were being awarded c. was awarding d. was being awarded  d 46. When I arrived, the train had left. a. never b. yet c. already d. suddenly ... 11: 1. a. hear b. dear c. tear d. bear > d 2. a. dead b. head c. weather d. seat > d 3. a. please b. nose c. lose d. house > d 4. a. main b. saint c. said d. maid > c 5. a. barn b....

Ngày tải lên: 21/08/2013, 00:10

... External Data Range is created for the imported data. If you base the pivot table on this named range, it expands automatically as new records are added, and the pivot table contains all the data. ... the external data, you may have used a reference to range of cells, such as BillingData! $A$ 1:$J$19, instead of using the external data range’s name. If data is added to the external data file, ... change the pivot table’s data source, so it uses the external data range name: 1. To see the name of the external data range, right-click a cell in the external data range, and then click Data...

Ngày tải lên: 09/10/2013, 12:20

... mmc and then press ENTER. d. On the Console menu, click Add/Remove Snap-in. e. In the Add/Remove Snap-in dialog box, click Add. f. On the Add Standalone Snap-in dialog box, click Certificates ... click Add, and then click Close. g. Click OK to close the Add/Remove Snap-in dialog box. h. On the Console menu, click Save As. i. In the Save As dialog box, type Certificate Management ... Designing a Public Key Infrastructure Copyright  2002 Microsoft Corporation. All Rights Reserved. Tasks Detailed Steps Why was the Base-64 encoded binary x.509 certificate format selected?...

Ngày tải lên: 19/10/2013, 02:15

... it again. The DataSet in this case is referred to as a disconnected DataSet as it doesn't maintain an active connection to the database. Disconnected DataSet objects act as a data cache ... time. Instead, a better approach is to connect to the database, fetch the data into a DataSet object, and then disconnect again. The user can browse the data in the DataSet and make any changes ... in applications. You can modify the data in the DataSet, and later reopen the connection and send the changes back to the database. You can manually open a connection to a database by creating...

Ngày tải lên: 15/12/2013, 00:15

... Team LiB ] Recipe 4.7 Updating a Data Source with Data from a Different Data Source Problem You want to update a data source using changes made to another data source for data replication ... that have changed in the original data source. This DataSet is then used to apply the changes to a second data source using its DataAdapter; the DataSet for the second data source is reloaded. ... creates a copy of the DataSet containing all changes that have been made to it since it was last retrieved from the data source or since AcceptChanges( ) was last called. To replicate the changes...

Ngày tải lên: 21/01/2014, 11:20

... the primary key is an AutoIncrement value and its value is generated by the database, the InsertCommand must return the primary key value from the data source and use it to update the value ... method of the DataAdapter for each of the parent, child, and junction tables. CreateData( ) This method creates random data in both the parent and child tables and randomly creates relationships ... ds.Clear( ); LoadData( ); } Discussion To avoid referential integrity problems when updating a data source with changes in a DataSet having tables related with a many-to-many relationship,...

Ngày tải lên: 26/01/2014, 10:20

... and Jo˜ao Neto. 2006. Dynamic vocabulary adaptation for a daily and real-time broadcast news transcription system. In IEEE/ACL Workshop on Spoken Language Technol- ogy, Aruba. Cristina Mota and ... grandes dimens˜oes de linguagem jornal´ıstica portuguesa. In Maria das Grac¸as Volpe Nunes, editor, Actas do V Encontro para o processamento computacional da l ´ ıngua portuguesa escrita e falada ... Ng and Cardie, 2003; Mota and Grishman, 2008). In particular, we showed that the perfor- mance of a name tagger based on co-training de- cays as the time gap between training data (seeds and...

Ngày tải lên: 20/02/2014, 09:20

... organism per se. These infiltrates can appear within a matter of days and can clinically simulate acute bacterial pneumonia. Anti-tubercular treatment has been considered to be an important factor ... was able to maintain 90% oxygen saturation (SaO 2 ) at room air. Anti-tuberculosis therapy was continued and at 12 weeks he was maintaining oxygen saturation (SaO 2 ) of 94% at room air. He was ... tuberculous bronchopneumonia, was able to maintain oxygen saturation (SaO 2 ) of 96% at room air, while patient with tuberculous pneumonia in case 2 was able to maintain SaO 2 of 90% at room air at six weeks. Organ...

Ngày tải lên: 06/03/2014, 04:20

... Editors 130. To avoid an appearance of conflict, certain editors must annually affirm to the chief financial officer of The Times Company that they have no financial holdings in violation of paragraphs ... fees may not exceed $200 an article. 36. Staff members may accept any gifts or discounts available to the general public. Normally they are also free to take advantage of conventional corporate ... construed as a payment for favorable coverage or as an inducement to alter or forgo unfavorable coverage. They may share in reprint fees that other journalistic media pay The Times, according...

Ngày tải lên: 06/03/2014, 11:20

... self-organize and adapt more easily. When a part of the data becomes a hotspot (i.e., queries focus on a small database fragment) physical storage and automatically col- lected navigational advice ... (a) have fast positional lookups in a BAT given a key and (b) avoid materializing the key part of a BAT in many situations completely. To enable fast cache-conscious scans, BATs are stored as ... queries. So far, attempts to create adaptive database systems are based either on continuous monitoring and manual tuning by a database administrator or on offline semi-automatic work- load analysis...

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