GenerateSnapshot 方法
產生可用來初始化其他 SQL Server Compact 資料庫以便進行同步處理的現有 SQL Server Compact 資料庫檔案快照集。
命名空間: Microsoft.Synchronization.Data.SqlServerCe
組件: Microsoft.Synchronization.Data.SqlServerCe (在 Microsoft.Synchronization.Data.SqlServerCe.dll 中)
語法
'宣告
Public Sub GenerateSnapshot ( _
sourceConnection As SqlCeConnection, _
destinationDatabasePath As String _
)
'用途
Dim instance As SqlCeSyncStoreSnapshotInitialization
Dim sourceConnection As SqlCeConnection
Dim destinationDatabasePath As String
instance.GenerateSnapshot(sourceConnection, _
destinationDatabasePath)
public void GenerateSnapshot(
SqlCeConnection sourceConnection,
string destinationDatabasePath
)
public:
void GenerateSnapshot(
SqlCeConnection^ sourceConnection,
String^ destinationDatabasePath
)
member GenerateSnapshot :
sourceConnection:SqlCeConnection *
destinationDatabasePath:string -> unit
public function GenerateSnapshot(
sourceConnection : SqlCeConnection,
destinationDatabasePath : String
)
參數
- sourceConnection
型別:SqlCeConnection
SqlCeConnection 物件,其中包含應該用來產生快照集之資料庫的連接。
- destinationDatabasePath
型別:System. . :: . .String
應該寫入快照集的檔案路徑。
例外
例外狀況 | 條件 |
---|---|
ArgumentNullException | sourceConnection 是 null Nothing nullptr unit null 參考 (在 Visual Basic 中為 Nothing) 。 |
ArgumentException | destinationDatabasePath 是 null Nothing nullptr unit null 參考 (在 Visual Basic 中為 Nothing) 或空的。 destinationDatabasePath 不是檔案。 -或- destinationDatabasePath 是 UNC 路徑。 |
DbSyncException | 無法初始化快照集。 |
備註
快照集初始化的用意是要減少初始化用戶端資料庫所需的時間。當已經使用完整初始化來初始化一個用戶端資料庫之後,後續的資料庫可以使用第一個用戶端資料庫的「快照集」來初始化。快照集是特別準備的 SQL Server Compact 資料庫,其中包含資料表結構描述、資料 (選擇性) 和變更追蹤基礎結構。請將這個快照集複製到需要它的每個用戶端。在用戶端的第一個同步處理工作階段期間,將會更新用戶端特有的中繼資料,而且在建立快照集之後所發生的所有變更都會下載到用戶端資料庫。
重要事項 |
---|
只有當 SQL Server Compact 資料庫中沒有任何活動時,才應該產生快照集。在快照集產生期間,並不支援任何型別的並行作業。 |
範例
下列程式碼範例會根據 SyncSampleClient1.sdf 資料庫產生名為 SyncSampleClient2.sdf 的快照集。然後,此程式碼會同步處理 SyncSampleClient2.sdf 與伺服器資料庫。若要在完整範例的內容中檢視這段程式碼,請參閱 HOW TO:設定及執行資料庫同步處理 (SQL Server)。
// Create a snapshot from the SQL Server Compact database, which will be used to
// initialize a second Compact database. Again, this database could be provisioned
// by retrieving scope information from another database, but we want to
// demonstrate the use of snapshots, which provide a convenient deployment
// mechanism for Compact databases.
SqlCeSyncStoreSnapshotInitialization syncStoreSnapshot = new SqlCeSyncStoreSnapshotInitialization("Sync");
syncStoreSnapshot.GenerateSnapshot(clientSqlCe1Conn, "SyncSampleClient2.sdf");
// The new SQL Server Compact client synchronizes with the server, but
// no data is downloaded because the snapshot already contains
// all of the data from the first Compact database.
syncOrchestrator = new SampleSyncOrchestrator(
new SqlSyncProvider("filtered_customer", serverConn, null, "Sync"),
new SqlCeSyncProvider("filtered_customer", clientSqlCe2Conn, "Sync")
);
syncStats = syncOrchestrator.Synchronize();
syncOrchestrator.DisplayStats(syncStats, "initial");
' Create a snapshot from the SQL Server Compact database, which will be used to
' initialize a second Compact database. Again, this database could be provisioned
' by retrieving scope information from another database, but we want to
' demonstrate the use of snapshots, which provide a convenient deployment
' mechanism for Compact databases.
Dim syncStoreSnapshot As New SqlCeSyncStoreSnapshotInitialization("Sync")
syncStoreSnapshot.GenerateSnapshot(clientSqlCe1Conn, "SyncSampleClient2.sdf")
' The new SQL Server Compact client synchronizes with the server, but
' no data is downloaded because the snapshot already contains
' all of the data from the first Compact database.
syncOrchestrator = New SampleSyncOrchestrator( _
New SqlSyncProvider("filtered_customer", serverConn, Nothing, "Sync"), _
New SqlCeSyncProvider("filtered_customer", clientSqlCe2Conn, "Sync"))
syncStats = syncOrchestrator.Synchronize()
syncOrchestrator.DisplayStats(syncStats, "initial")
請參閱
參考
SqlCeSyncStoreSnapshotInitialization類別