检查了 AWS 文档,但没有找到任何工作示例。
这是我的尝试
var params = {
TableName: "User",
IndexName:"a-b-index",
KeyConditionExpression: "Country = :country and #s = :status",
FilterExpression: "Id IN (:e)",
ExpressionAttributeValues: {
":country ": "USA",
":status": 1,
":e": "1"
},
ExpressionAttributeNames: {"#s": "Status"}
};
//get users
dynamodb.query(params, function (err, data) {
if (err)
//error
else {
//success
}
});
得到记录,但它正在获取 ID 为 1
的记录,但我想使用这样的数组
var params = {
TableName: "User",
IndexName:"a-b-index",
KeyConditionExpression: "Country = :country and #s = :status",
FilterExpression: "Id IN (:e)",
ExpressionAttributeValues: {
":country ": "USA",
":status": 1,
":e": ["1","2","3"]
},
ExpressionAttributeNames: {"#s": "Status"}
};
//get users
dynamodb.query(params, function (err, data) {
if (err)
//error
else {
//success
}
});
如何使上述代码正常工作。想要获取记录。语法正确,查询运行没有错误,但我没有得到记录
最佳答案
请引用 answer
总结:-
对于“IN”子句中固定数量的值:-
var params = {
TableName : "Users",
FilterExpression : "username IN (:user1, :user2)",
ExpressionAttributeValues : {
":user1" : "john",
":user2" : "mike"
}
};
对于数组中的更多元素并动态形成FilterExpression:-
var titleValues = ["The Big New Movie 2012", "The Big New Movie"];
var titleObject = {};
var index = 0;
titleValues.forEach(function(value) {
index++;
var titleKey = ":titlevalue"+index;
titleObject[titleKey.toString()] = value;
});
var params = {
TableName : "Movies",
FilterExpression : "title IN ("+Object.keys(titleObject).toString()+ ")",
ExpressionAttributeValues : titleObject
};
关于node.js - 如何使用数组在FilterExpression中使用 “IN”语句 - dynamodb,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40283653/