当需要从数据源选择记录时，打开动态集或快照对象。
Open a dynaset or snapshot object when you need to select records from a data source.
合理高效的数据源选择策略是提高空间信息检索系统效率的重要因素之一。
Effective data source selection strategy is one of the important issues of the spatial information retrieval.
使用select语句从一个数据源选择构成外部表的数据(参见清单3)。
Using a select statement to select from a data source into an external table (see Listing 3).
语句从数据源选择记录时，通常会得到一个结果集，即一组来自表或查询的记录。
Normally when you select records from a data source using a SQL SELECT statement, you get a result set, which is a set of records from a table or a query.
接着，在TargettheDataSource框架中，为该数据源选择目标服务器。
Next, in the Target the Data Source frame, select a target server for the data source.
为了创建数据集，我们必须选择一个数据源，因为不同的信息可以从不同的快照中获得。
To create data sets, we must choose a data source because different information can be derived from different snapshots.
因为联邦过程所引用的远程过程不由联邦服务器进行管理，所以当过程在数据源上执行时无法强制实施选择的级别。
Since the remote procedure referenced by the federated procedure is not managed by the federated server, the level chosen cannot be enforced during the execution of the procedure at the data source.
第二种选择，如果数据源是遗留系统，可能就必须使用适配器或JCA。
Second, if the data sources are legacy systems, you might have to use adapters or JCA.
选择该数据源的范围(图17)。
如果向查询提供数据的后端数据源断开了，并且优化器选择使用MQT来满足查询，那么查询将会执行。
If a back-end data source that provides data to a query is down and the optimizer chooses to satisfy the query using MQTs, the query will be executed.
在显示的对话框中，输入SAMPLEDB作为数据源名称，并从下拉列表中选择SAMPLEDB作为数据库别名。
In the dialogue box that displays, enter SAMPLEDB as the Data source name and choose SAMPLEDB from the drop-down list for the Database alias.
考虑在联邦服务器上，而不是在远程数据源上执行的选择谓词的影响。
Consider the effect of a selective predicate being evaluated at the federated server instead of at the remote data source.
选择测试的数据源所用的别名。
本文的运行时和开发数据源相同，所以选择adminreg。
The runtime and development data sources are the same for this article, so select ADMINREG.
在显示的向导中，选择将用于数据源的连接、数据对象和列。
In the wizard that is displayed, select the connection, the data objects, and the columns to be used for the data source.
选择包含所需数据的SAPBW数据源，然后单击 OK。
Select the SAP BW data source containing the data required, and click ‘OK’.
选择合适的提供程序和V4数据源。
尽管数据类型在Web服务开发中可以部分地解决数据源的选择问题，但对于服务请求者WSDL仍旧不是一个好的解决方案。
Although the data type in Web service development can partially resolve the problem to give out the options of data sources, WSDL itself is still a problematic guidance to the service requesters.
创建一个名为HUMANCOST的多维数据集，选择GBPM 4etl作为关系数据源。
Create a cube called HUMANCOST, and choose GBPM4ETL as the relational data source.
如果“MyService”需要访问多个数据源，那么至少有三种选择。
If "MyService" needs to access multiple data sources, there are at least three options.
从列表中选择适当的Cognos数据源(在本例中为odmtest)，然后单击next。
Select the appropriate Cognos data source from the list (in this example, it's ODMTEST), and click on next.
XQuery能够满足应用程序的数据需求：可以访问多个数据源、选择信息和连接数据。
XQuery addresses the data needs of an application by enabling access to multiple sources, selecting information from them, and joining the data.
确保选中创建的OracleEssbase数据源，单击Next，然后找到并选择所需的多维数据集。
Ensure the Oracle Essbase data source that was created is selected, click Next, and then locate and select the desired cube.
确认Derby网络数据库正在运行，然后选择OrderDS数据源，并单击TestConnection(图23)。
Verify that the Derby network database is running, then select the Order DS data source and click Test Connection (Figure 23).
确保选中创建的SAPBW数据源，单击Next，然后找到并选择所需的报表对象(InfoQuery、InfoCube等)导入。
Ensure the SAP BW data source that was created is selected, click Next, and then locate and select the desired reporting objects (InfoQuery, InfoCube, etc) for import.
确保选中创建的IBMCognosTM1数据源，单击Next，然后选择要导入的多维数据集。
Ensure the IBM Cognos TM1 data source that was created is selected, click Next, and then select the cube for import.
在Configuration视图中，右键单击DELIM数据源，然后选择Editmetadata。
From the Configuration view, right-click on the DELIM data source, and choose Edit metadata.
选择新建的数据源并使用 “Testconnection”按钮检查是否可以正确连接到数据库，如图22 所示。
Select the newly created datasource and use the 'Test connection' button to check the database can be connected to correctly, as shown in figure 22.
为了创建提要，销售主管需要从数据源列表中选择ExcelWorkbook，然后单击Next。
In order to create the feed, the sales executives need to select the Excel Workbook from the data source list, and click Next.
选择CustomProperties显示数据源定义的完整的属性列表。
Select Custom properties to display the full list of the properties defined on the data source.
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