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事务处理 #1

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9270e5e
事务 读主库
quinhe Jun 9, 2015
5213aeb
1.事务转主库 2.支持多个数据库时部分数据库读写分离
quinhe Jun 9, 2015
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9 changes: 8 additions & 1 deletion 01.Infrastructure/NDF.Data.Entity/MasterSlaves/DbMasterSlaveCommandInterceptor.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -135,13 +135,20 @@ where this.ValidateContextCanApplyTo(context)
/// <param name="interceptionContext"></param>
protected virtual void UpdateToSlaveIfNeed(DbCommand command, DbInterceptionContext interceptionContext)
{
// 判断当前会话是否处于分布式事务中
bool isDistributedTran = Transaction.Current != null && Transaction.Current.TransactionInformation.Status != TransactionStatus.Committed;

var contexts = from context in interceptionContext.DbContexts
where this.ValidateContextCanApplyTo(context)
select context;

foreach (var context in contexts)
{
string connectionString = this.GetSlaveConnectionString(context);
// 判断该 context 是否处于普通数据库事务中
bool isDbTran = context.Database.CurrentTransaction != null;
// 如果处于分布式事务或普通事务中，则“禁用”读写分离，处于事务中的所有读写操作都指向 Master
string connectionString = isDistributedTran || isDbTran ? this.MasterConnectionString : this.GetSlaveConnectionString(context);

this.UpdateConnectionStringIfNeed(command, context.Database.Connection, connectionString);
this.StartServersStateScanIfNeed(context);
}
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23 changes: 22 additions & 1 deletion 01.Infrastructure/NDF.Data.Entity/MasterSlaves/DbMasterSlaveConnectionInterceptor.cs
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Expand Up @@ -35,15 +35,36 @@ internal DbMasterSlaveConfigContext Config
}


/// <summary>
/// 在开启一个数据库事务动作执行前瞬间触发。
/// </summary>
/// <param name="connection"></param>
/// <param name="interceptionContext"></param>
public override void BeginningTransaction(DbConnection connection, BeginTransactionInterceptionContext interceptionContext)
{
UpdateToMasterIfNeed(connection, interceptionContext, this.Config);
}

/// <summary>
/// 在打开数据库连接动作执行前瞬间触发。将数据库连接字符串更新至 EF 数据库主从读写分离服务中配置的相关值。
/// </summary>
/// <param name="connection"></param>
/// <param name="interceptionContext"></param>
public override void Opening(DbConnection connection, DbConnectionInterceptionContext interceptionContext)
{
string connectionString = this.Config.UsableMasterConnectionString;
UpdateToMasterIfNeed(connection, interceptionContext, this.Config);
}

internal static void UpdateToMasterIfNeed(DbConnection connection,
DbInterceptionContext interceptionContexts, DbMasterSlaveConfigContext config)
{
//判断是否是该过滤器的数据库
if (!interceptionContexts.DbContexts.Any(config.CanApplyTo))
{
return;
}
//比较连接字符串
string connectionString = config.UsableMasterConnectionString;
if (!DbMasterSlaveCommandInterceptor.ConnectionStringEquals(connection, connectionString))
{
DbMasterSlaveCommandInterceptor.UpdateConnectionString(connection, connectionString);
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