Tài liệu Updating a Primary Key Value pdf

... [ Team LiB ] Recipe 4.8 Updating a 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 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...

Ngày tải lên: 26/01/2014, 10:20

... create a field that is automatically incremented, called an identity field. This identity field can also be set as the primary key field, again so that the record is made unique. The primary key ... Number, and make that into a primary key field. By making a field the primary key field, you will need to make that field unique and prohibit null values there. The alter...

Ngày tải lên: 14/12/2013, 20:16

... 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 cha...

Ngày tải lên: 15/12/2013, 00:15

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Ngày tải lên: 23/12/2013, 04:18

... the database user account. I have been authenticated and logged into SQL Server and now I need to access data that is stored within a SQL Server database. Without a specific database user account, ... account, I am unable to access and use data that SQL Server manages. Technique Enterprise Manager provides the dialog boxes that are necessary to create user accounts in any of its dat...

Ngày tải lên: 24/12/2013, 06:17

... typed DataSet. Table 2-1. TableNameDataTable methods Method Description AddTableNameRow( ) Adds a row to the table. The method has two overloads: one takes a TableNameRow object as the argument, ... strongly typed DataSet. There is a class named TableNameRow for each table in the strongly typed DataSet. It has the base class DataRow and represents a row of data in the table....

Ngày tải lên: 21/01/2014, 11:20

... 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 r...

Ngày tải lên: 21/01/2014, 11:20

... the database, the InsertCommand must return the primary key value from the data source and use it to update the value in the DataSet. The DataSet will then automatically cascade this new value ... records. [ Team LiB ] [ Team LiB ] Recipe 4.10 Updating a DataSet with a Many-to-Many Relationship Problem You have a DataSet that contains two tables that have a ma...

Ngày tải lên: 26/01/2014, 10:20

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Ngày tải lên: 20/02/2014, 01:20

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Ngày tải lên: 22/02/2014, 05:20