Dynamodb - 使用哈希键获取所有行

Question

当您的行同时使用哈希键和范围键时，有没有办法从 DynamoDB 中获取使用特定哈希键的所有行？

例子： Hash Range A B A C A D E F

然后 getItems(Hash=A) 返回 3 行

Answer 1

Yes, it is possible using the Query API. Here is the sample code (Node JS).

I have a Movie table with hash key (year key) and sort key (title). I have queried using the hash key. I have got four items in the result i.e. four titles available for the year 1992.

var docClient = new AWS.DynamoDB.DocumentClient();    
var table = "Movies";    
var year_val = 1992;    
var params = {
    TableName : table,
    KeyConditionExpression : 'yearkey = :hkey',
    ExpressionAttributeValues : {
        ':hkey' : year_val      
    }
};

docClient.query(params, function(err, data) {
    if (err) {
        console.error("Unable to read item. Error JSON:", JSON.stringify(err,
                null, 2));
    } else {
        console.log("GetItem succeeded:", JSON.stringify(data, null, 2));
    }
});