Question

我有一个dynamoDB表，其架构如下：

var request = new CreateTableRequest
{
    TableName = tableName,
    KeySchema = new List<KeySchemaElement>
    {
        new KeySchemaElement("CompanyId", KeyType.HASH),
        new KeySchemaElement("Timestamp", KeyType.RANGE)
    },
    AttributeDefinitions = new List<AttributeDefinition>
    {
        new AttributeDefinition("CompanyId", ScalarAttributeType.S),
        new AttributeDefinition("Timestamp", ScalarAttributeType.N),
        new AttributeDefinition("UserId", ScalarAttributeType.S)
    },
    GlobalSecondaryIndexes = new List<GlobalSecondaryIndex>
    {
        new GlobalSecondaryIndex
        {
            IndexName = "UserIndex",
            KeySchema = new List<KeySchemaElement>
            {
                new KeySchemaElement("UserId", KeyType.HASH),
                new KeySchemaElement("Timestamp", KeyType.RANGE)
            },
            Projection = new Projection {ProjectionType = "ALL"},
            ProvisionedThroughput = new ProvisionedThroughput(5, 6)
        }
    },
    ProvisionedThroughput = new ProvisionedThroughput(5, 6)
};

我可以按如下方式成功查询主键：

var client = new AmazonDynamoDBClient();
using (var context = new DynamoDBContext(client))
{
    var sortKeyValues = new List<object>{minTimestamp};
    result = await context.QueryAsync<AuditLogEntry>(companyId, QueryOperator.GreaterThanOrEqual, sortKeyValues,
                            new DynamoDBOperationConfig {OverrideTableName = TableName}).GetRemainingAsync();
}

我可以查询全局二级索引，而不对范围键有任何限制，如下所示：

var client = new AmazonDynamoDBClient();
using (var context = new DynamoDBContext(client))
{
    result = await context.QueryAsync<AuditLogEntry>(userId, new DynamoDBOperationConfig {OverrideTableName = TableName, IndexName = indexName})
        .GetRemainingAsync();
}

但是当我尝试使用范围键约束查询索引时：

var client = new AmazonDynamoDBClient();
using (var context = new DynamoDBContext(client))
{
    var sortKeyValues = new List<object> {minTimestamp};
    result = await context.QueryAsync<AuditLogEntry>(userId, QueryOperator.GreaterThan, sortKeyValues, new DynamoDBOperationConfig {OverrideTableName = TableName, IndexName = indexName}).GetRemainingAsync();
}

我收到以下错误：

Exception thrown: 'System.InvalidOperationException' in AWSSDK.DynamoDBv2.dll

Additional information: Local Secondary Index range key conditions are used but no index could be inferred from model. Specified index name = UserIndex

谷歌搜索此错误并没有对此问题有任何启示。对本地二级索引的引用让我感到困惑，因为我使用的是全局索引，但我无法看清我的代码有什么问题。

我已经能够通过直接在AmazonDynamoDBClient上查询而不是使用DynamoDBContext来查询查询，但我真的很想了解我做错了什么并且能够使用DynamoDBContext。

任何想法都会受到赞赏。

Answer 1

在为AuditLogEntry模型定义你需要装饰能与属性全局二级索引的部件属性 - [DynamoDBGlobalSecondaryIndexRangeKey]和或[DynamoDBGlobalSecondaryIndexHashKey]

.net通过DynamoDBContext查询DynamoDB中的全局二级索引

1 个答案: