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[英]DynamoDB - Update item but retain database's current version of a field in that item
[英]DynamoDB expression to Update if item does not exist or other field equals certain value
尝试执行条件更新时出现以下错误:
ConditionExpression无效:语法错误; 令牌:“-”,附近:“ PageRouteee1181aa-8035”
我有以下课程:
public class RestaurantPageRouteItem
{
[DynamoDBHashKey]
public string PageRoute { get; set; }
public string RestaurantId { get; set; }
}
我创建以下表达式:
new Expression
{
ExpressionStatement = $"attribute_not_exists({item.PageRoute}) OR {item.RestaurantId} = :restaurantid",
ExpressionAttributeValues =
{
[":restaurantid"] = item.RestaurantId
}
}
设法提出以下建议:
new Expression {
ExpressionStatement =
"(attribute_not_exists(#ID) OR :id = #ID) OR " +
"(attribute_not_exists(PageRoute))",
ExpressionAttributeValues = {
[":id"] = item.RestaurantId
},
ExpressionAttributeNames = {
["#ID"] = "RestaurantId"
}
}
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