public async Task <HashGroup> QueryById(Guid id)
{
HashGroup group = null;
//获取只读连接字符串
var strConn = _hashConnectionFactory.CreateReadForHash();
await DBTransactionHelper.SqlTransactionWorkAsync(DBTypes.SqlServer, true, false, strConn, async (conn, transaction) =>
{
SqlTransaction sqlTran = null;
if (transaction != null)
{
sqlTran = (SqlTransaction)transaction;
}
using (SqlCommand commond = new SqlCommand()
{
Connection = (SqlConnection)conn,
CommandType = CommandType.Text,
Transaction = sqlTran,
CommandText = string.Format(@"select {0},{1} from HashGroup as g join HashGroupStrategy as s
on g.strategyid=s.id
where g.[id]=@id", StoreHelper.GetHashGroupSelectFields("g"), StoreHelper.GetHashGroupStrategySelectFields("s"))
})
{
var parameter = new SqlParameter("@id", SqlDbType.UniqueIdentifier)
{
Value = id
};
commond.Parameters.Add(parameter);
commond.Prepare();
SqlDataReader reader = null;
using (reader = await commond.ExecuteReaderAsync())
{
if (await reader.ReadAsync())
{
group = new HashGroup();
StoreHelper.SetHashGroupSelectFields(group, reader, "g");
group.Strategy = new HashGroupStrategy();
StoreHelper.SetHashGroupStrategySelectFields(group.Strategy, reader, "s");
}
reader.Close();
}
}
});
return(group);
}
public async Task QueryByAll(Guid groupId, Func <HashRealNode, Task> callback)
{
List <HashRealNode> result = new List <HashRealNode>();
int size = 500;
int perSize = 500;
Guid?nodeId = null;
//获取只读连接字符串
var strConn = _hashConnectionFactory.CreateReadForHash();
while (perSize == size)
{
result.Clear();
await DBTransactionHelper.SqlTransactionWorkAsync(DBTypes.SqlServer, true, false, strConn, async (conn, transaction) =>
{
SqlTransaction sqlTran = null;
if (transaction != null)
{
sqlTran = (SqlTransaction)transaction;
}
using (SqlCommand commond = new SqlCommand()
{
Connection = (SqlConnection)conn,
CommandType = CommandType.Text,
Transaction = sqlTran,
CommandText = string.Format(@"if @nodeid is null
begin
select top (@size) {0},{1},{2} from HashRealNode as n join HashGroup as g
on n.groupid=g.id
join HashGroupStrategy as s
on g.strategyid=s.id
where n.[groupid]=@groupid
order by n.id
end
else
begin
select top (@size) {0},{1},{2} from HashRealNode as n join HashGroup as g
on n.groupid=g.id
join HashGroupStrategy as s
on g.strategyid=s.id
where n.[groupid]=@groupid and n.id>@nodeid
order by n.id
end", StoreHelper.GetHashRealNodeSelectFields("n"), StoreHelper.GetHashGroupSelectFields("g"), StoreHelper.GetHashGroupStrategySelectFields("s"))
})
{
var parameter = new SqlParameter("@groupid", SqlDbType.UniqueIdentifier)
{
Value = groupId
};
commond.Parameters.Add(parameter);
if (nodeId == null)
{
parameter = new SqlParameter("@nodeid", SqlDbType.UniqueIdentifier)
{
Value = DBNull.Value
};
}
else
{
parameter = new SqlParameter("@nodeid", SqlDbType.UniqueIdentifier)
{
Value = nodeId
};
}
commond.Parameters.Add(parameter);
parameter = new SqlParameter("@size", SqlDbType.Int)
{
Value = size
};
commond.Parameters.Add(parameter);
commond.Prepare();
SqlDataReader reader = null;
using (reader = await commond.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
var record = new HashRealNode();
StoreHelper.SetHashRealNodeSelectFields(record, reader, "n");
record.Group = new HashGroup();
StoreHelper.SetHashGroupSelectFields(record.Group, reader, "g");
record.Group.Strategy = new HashGroupStrategy();
StoreHelper.SetHashGroupStrategySelectFields(record.Group.Strategy, reader, "s");
result.Add(record);
nodeId = record.ID;
}
reader.Close();
}
}
});
perSize = result.Count;
foreach (var item in result)
{
await callback(item);
}
}
}