问题描述
我想同步2个不同的数据库以及表和columns.i创建的SYNC应用程序.通过使用同步框架.它由azure托管.我也看过以下文章:
Hi i would like to sync 2 different database and tables and columns.i created SYNC app. by using a sync framework.it is hosted by azure. also i've read below articles:
http://jtabadero.wordpress.com/2011/08/19/part-4-synchronizing-tables-with-different-table-names-and-column-names/ http://www.devart.com/dotconnect/oracle/docs/SyncFramework. html
但是我有一个Nullreference异常. OrderTable没有正确的列.看照片.如何解决这个问题.
http://jtabadero.wordpress.com/2011/08/19/part-4-synchronizing-tables-with-different-table-names-and-column-names/http://www.devart.com/dotconnect/oracle/docs/SyncFramework.html
But i have a Nullreference exception. OrderTable havent got correct columns. Look pics. How to solve this problem.
namespace WorkerRole1
{
public class WorkerRole : RoleEntryPoint
{
public override void Run()
{
// This is a sample worker implementation. Replace with your logic.
Trace.TraceInformation("WorkerRole1 entry point called", "Information");
Setup();
while (true)
{
Sync();
Thread.Sleep(10000);
Trace.TraceInformation("Working", "Information");
}
}
private void Setup()
{
string scopeName = "DifferentSchemaScope";
string MemberSQLAzureConnectionString = ConfigurationManager.ConnectionStrings["MemberSQLAzureConnectionString"].ConnectionString;
string HubSQLAzureConnectionString = ConfigurationManager.ConnectionStrings["HubSQLAzureConnectionString"].ConnectionString;
using (SqlConnection sqlMemberAzureConn = new SqlConnection(MemberSQLAzureConnectionString))
{
using (SqlConnection sqlHubAzureConn = new SqlConnection(HubSQLAzureConnectionString))
{
if (sqlHubAzureConn.State == System.Data.ConnectionState.Open && sqlMemberAzureConn.State == ConnectionState.Open)
{
DbSyncScopeDescription myScope = new DbSyncScopeDescription(scopeName);
DbSyncTableDescription serverTableDesc = SqlSyncDescriptionBuilder.GetDescriptionForTable("myTest.SourceOrderTable", sqlHubAzureConn);
serverTableDesc.GlobalName = "OrderTable";
DbSyncTableDescription clientTableDesc = SqlSyncDescriptionBuilder.GetDescriptionForTable("myTest.DestinationOrderTable", sqlMemberAzureConn);
clientTableDesc.GlobalName = "OrderTable";
myScope.Tables.Add(serverTableDesc);
myScope.Tables.Add(clientTableDesc);
SqlSyncScopeProvisioning sqlServerProv = new SqlSyncScopeProvisioning(myScope);
SqlSyncScopeProvisioning sqlAzureProv = new SqlSyncScopeProvisioning(myScope);
sqlServerProv.PopulateFromScopeDescription(myScope);
myScope.Tables["OrderTable"].Columns.Remove(myScope.Tables["OrderTable"].Columns["OrderQty"]);
myScope.Tables["OrderTable"].Columns["OrderId"].IsPrimaryKey = true;
sqlAzureProv.PopulateFromScopeDescription(myScope);
if (!sqlServerProv.ScopeExists(scopeName, sqlHubAzureConn))
{
sqlServerProv.Apply(sqlHubAzureConn);
}
// sqlAzureProv.SetCreateTableDefault(DbSyncCreationOption.Skip);
if (!sqlAzureProv.ScopeExists(scopeName, sqlMemberAzureConn))
{
sqlAzureProv.Apply(sqlMemberAzureConn);
}
}
}
}
}
private void Sync()
{
string scopeName = "DifferentSchemaScope";
string MemberSQLAzureConnectionString = ConfigurationManager.ConnectionStrings["MemberSQLAzureConnectionString"].ConnectionString; //CloudConfigurationManager.GetSetting("MemberSQLAzureConnectionString");
string HubSQLAzureConnectionString = ConfigurationManager.ConnectionStrings["HubSQLAzureConnectionString"].ConnectionString; //CloudConfigurationManager.GetSetting("HubSQLAzureConnectionString");
using (SqlConnection sqlMemberAzureConn = new SqlConnection(MemberSQLAzureConnectionString))
{
using (SqlConnection sqlHubAzureConn = new SqlConnection(HubSQLAzureConnectionString))
{
var localProvider = new SqlSyncProvider(scopeName, sqlHubAzureConn);
var remoteProvider = new SqlSyncProvider(scopeName, sqlMemberAzureConn);
remoteProvider.ChangesSelected += remoteProvider_ChangesSelected;
SyncOrchestrator syncOrchestrator = new SyncOrchestrator
{
LocalProvider = localProvider,
RemoteProvider = remoteProvider,
Direction = SyncDirectionOrder.UploadAndDownload
};
syncOrchestrator.Synchronize();
}
}
}
void remoteProvider_ChangesSelected(object sender, DbChangesSelectedEventArgs e)
{
if (e.Context.DataSet.Tables.Contains("OrderTable"))
{
DataTable dataTable = new DataTable();
dataTable = e.Context.DataSet.Tables["OrderTable"];
//rename the columns to match the destination table’s column names
dataTable.Columns["OrderId"].ColumnName = "OrderNo";
dataTable.Columns["OrderDesc"].ColumnName = "OrderDetail";
}
}
public override bool OnStart()
{
// Set the maximum number of concurrent connections
ServicePointManager.DefaultConnectionLimit = 12;
// For information on handling configuration changes
// see the MSDN topic at http://go.microsoft.com/fwlink/?LinkId=166357.
return base.OnStart();
}
}
}
SQL:
id应该是主键....
id should be primary key....
创建模式myTest
CREATE SCHEMA myTest
创建表[myTest].[SourceOrderTable]( [OrderId] [int] IDENTITY(1,1)NOT NULL， [OrderDesc] nvarchar NULL)
CREATE TABLE [myTest].[SourceOrderTable]( [OrderId] [int] IDENTITY(1,1) NOT NULL, [OrderDesc] nvarchar NULL)
CREATE TABLE [myTest].[DestinationOrderTable](
[OrderNo] [int] IDENTITY(1,1) NOT NULL,
[OrderDetail] [nvarchar](50) NULL,
[OrderQty] int NULL)
，但是它不起作用.它在"void remoteProvider_ChangesSelected(object sender，DbChangesSelectedEventArgs e)"上产生了一个错误，这就是为什么remoteprovider列名称未更改的原因.remoteProvider列名称为"OrderNo，OrderDetail"，但必须为"OrderId，OrderDesc"，如图所示:
but it is not working. it produced an error on "void remoteProvider_ChangesSelected(object sender, DbChangesSelectedEventArgs e)" That's Why remoteprovider columns name is not changed.remoteProvider Columns Names are "OrderNo,OrderDetail" but it must be "OrderId ,OrderDesc" look picture:
错误图片:
推荐答案
检查您的同步方向.它说上载和下载"，您将ChangesSelected绑定到了作为目标的远程提供程序上.
check your sync direction.it says Upload and Download, you bind the ChangesSelected on the remote provider which is your destination.
该事件将在下载时触发，您的目标"现在是您的来源.因此，您的数据集中的内容是有效的，那就是目标表中选择更改的结构(现在是源，因为下载时同步方向相反)
the event will fire on the download, your "destination" is now your source. so whats in you dataset is valid, thats the structure in the destination table where the changes were selected (which is now the source because the sync direction is reversed on download)
由于您正在进行双向同步，因此两个提供程序上都应具有ChangesSelected事件.
since you are doing bidirectional sync, you should have ChangesSelected event on both providers.
本地提供者ChangesSelected应该映射OrderId-> OrderNo/OrderDesc-> OrderDetail
the local provider ChangesSelected should map OrderId -> OrderNo / OrderDesc->OrderDetail
远程提供者ChangesSelected应该与相反的OrderNo-> OrderId/OrderDetail-> OrderDesc
the remote provider ChangesSelected should be the opposite OrderNo -> OrderId / OrderDetail->OrderDesc
这篇关于如何在2个不同的数据库表中同步不同的列名?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！