如何使用对象持久性模型动态更改C#中的dynamodb表名 [英] How do I dynamically change dynamodb tablename in c# using object persistence model
问题描述
我正在使用dynamodb 对象持久性模型。
I was using dynamodb Object Persistence model.
DynamoDBTable("mydynamodbtablename")]
public class mytable
{
....
}
现在的问题是,如果我尝试使表的名称在运行时动态更改(我通过配置文件获取表名称),则会出错
problem is now if I tried to make the name of the table to change dynamically in runtime (I get table names through config files), I get errors
var Table_Name = Config.GetTableName();
DynamoDBTable(Table_Name)]
public class mytable
{
....
}
错误:属性参数必须是属性参数类型为xxx的常量表达式,typeof表达式或数组创建表达式
error: An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type xxx
是否有一种方法(简便方法),以便我仍然可以使用DDB对象持久性模型并使表名称动态化?
Is there a way (easy way) so that I can still use DDB Object Persistence Model and make tables name dynamic?
更新:
似乎我没有明确提到ddb持久性模型。这是官方文档
http://docs.aws。 amazon.com/amazondynamodb/latest/developerguide/CRUDHighLevelExample1.html
It seems that I didn't mentioned ddb persistence model clearly. Here is the official document http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/CRUDHighLevelExample1.html
这是在实际实践中如何使用对象持久性模型的示例
and here is an example of how in real practice do we use object persistence model
var records = await context.LoadAsync<mytable>(somekey);
foreach(var item in records)
{
....
}
推荐答案
使用接受的
: LoadAsync< T>
方法的重载DynamoDBOperationConfig
Use the overload of the LoadAsync<T>
method that accepts a DynamoDBOperationConfig
:
var config = new DynamoDBOperationConfig
{
OverrideTableName = "MyTableName"
};
var records = await context.LoadAsync<mytable>(somekey, config);
foreach(var item in records)
{
....
}
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