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Each changed row has a version number that is associated with it. Obtain incremental changes by using the synchronization version obtained the last time the data was synchronized.Ī database that has change tracking enabled has a version counter that increases as changes are made to change tracked tables. This will be used the next time CHANGETABLE(CHANGES.) is called. Obtain the current synchronization version. When an application obtains changes, it must use both CHANGETABLE(CHANGES.) and CHANGE_TRACKING_CURRENT_VERSION(), as shown in the following example. To obtain the version for use in the next change enumeration, use CHANGE_TRACKING_CURRENT_VERSION(), as shown in the following example. SELECTĬT.SYS_CHANGE_OPERATION, CT.SYS_CHANGE_COLUMNS,ĬHANGETABLE(CHANGES SalesLT.Product, AS CT This is required to make sure that the change information is returned for those rows that have been deleted from the user table. For example, the following query joins with the SalesLT.Product table to obtain the values for the Name and ListPrice columns. Therefore, an application would join the results from CHANGETABLE(CHANGES. Usually, a client will want to obtain the latest data for a row instead of only the primary keys for the row. declare bigint ĬT.SYS_CHANGE_COLUMNS, CT.SYS_CHANGE_CONTEXTĬHANGETABLE(CHANGES SalesLT.Product, AS CT For example, the following query obtains changes for the SalesLT.Product table. To obtain the changed rows for a table and information about the changes, use CHANGETABLE(CHANGES.). Use the change tracking functions to obtain changes This will be used next time that changes are obtained.
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The following example shows how to obtain the initial synchronization version and the initial data set. ) the first time that changes are obtained. This version will be passed to CHANGETABLE(CHANGES. The application must obtain the appropriate data directly from the table, and then use CHANGE_TRACKING_CURRENT_VERSION() to obtain the initial version. Obtain initial dataīefore an application can obtain changes for the first time, the application must send a query to obtain the initial data and the synchronization version. If the last synchronization version is less than the version returned by this function, the client will be unable to obtain valid results from CHANGETABLE() and will have to reinitialize. The client should check the last synchronization version against the value that is returned by this function. Used to obtain the minimum valid version that a client can have and still obtain valid results from CHANGETABLE(). This version represents the version of the last committed transaction.ĬHANGE_TRACKING_MIN_VALID_VERSION() function Used to obtain the current version that will be used the next time when querying changes. Product IDĬHANGE_TRACKING_CURRENT_VERSION() function Product IDĬlient B last synchronized at 10:30 AM. These tracked changes are summarized below.ĬHANGETABLE(CHANGES.) Output - 11:30 AMĬlient A last synchronized at 9:30 AM. At 10:00 AM and again at 11:00 AM, several changes were made to the data. In this example, Client A last synchronized at 9:30 AM, while Client B last synchronized at 10:30 AM. The following illustration shows how CHANGETABLE(CHANGES.
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) will therefore return all changes that have occurred after the last synchronization version. The calling client has obtained changes and knows about all changes up to and including the last synchronization version.ĬHANGETABLE(CHANGES.
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The semantics of the last synchronization version are as follows: The last synchronization version is obtained using the variable. ) takes a last synchronization version as an argument. The function returns a results set that contains the primary keys of rows that have changed together with other change information such as the operation, columns updated and version for the row.ĬHANGETABLE(CHANGES. The function queries the data stored in the internal change tracking tables. This rowset function is used to query for change information. About the change tracking functionsĪpplications can use the following functions to obtain the changes that are made in a database and information about the changes: Obtain changes by using change tracking functionsĭescribes how to use the change tracking functions to obtain changes and information about the changes that were made to a database. This article describes how to perform these tasks, and also the role change tracking plays when a failover occurs and a database must be restored from a backup.
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Groupon barbie exhibit las vegas.Applications that use change tracking must be able to obtain tracked changes, apply these changes to another data store, and update the source database.