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How to Partially Update a DynamoDB Table?


How to Partially Update a DynamoDB Table?

By : Alexandre Frederico
Date : October 17 2020, 01:08 AM
I think the issue was by ths following , In dynamoDB if your userLogin is a map type then you can update the value of lastLoginkey. In Java below code may help. Here column name would be userLogin and newKey would be lastLogin. Full code snippet can be found here
code :
UpdateItemSpec updateItemSpec = new UpdateItemSpec().withPrimaryKey(primaryKey,primaryKeyValue).withReturnValues(ReturnValue.ALL_NEW).
        withUpdateExpression("set #columnName." + newKey + " = :columnValue").
        withNameMap(new NameMap().with("#columnName", updateColumn)).
        withValueMap(new ValueMap().with(":columnValue", newValue)).withConditionExpression("attribute_exists("+ updateColumn +")");

table.updateItem(updateItemSpec);


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Partially update table from csv

Partially update table from csv


By : Sara
Date : March 29 2020, 07:55 AM
help you fix your problem I am running the following query: , Your update query should be like this:
code :
UPDATE data B
INNER JOIN customers A USING (customers_id)
SET A.customers_id = B.customers_id,
A.customers_banktransfer_iban = B.customers_banktransfer_iban,
A.customers_banktransfer_bic = B.customers_banktransfer_bic;
Performance comparison for SELECT and UPDATE when update a table partially

Performance comparison for SELECT and UPDATE when update a table partially


By : Leonardo Froio Ináci
Date : March 29 2020, 07:55 AM
it fixes the issue If you are replacing the entire table (possibly with mostly the same data), it is fairly straight forward to do it this way, and not worry about which approach:
code :
CREATE TABLE new LIKE real;
Load the new data entirely into `new`
RENAME TABLE real TO old, new TO real;  -- atomic and instantaneous (no downtime)
DROP TABLE old;
DynamoDB table gets partially updated

DynamoDB table gets partially updated


By : Ron Kersic
Date : March 29 2020, 07:55 AM
wish helps you The first problem is on FeedbackForm class. All the attributes are defined with annotation @DynamoDBHashKey. Please change the annotation as mentioned below for non hash key fields. You should use @DynamoDBAttribute for normal attributes.
code :
@DynamoDBAttribute(attributeName = "comments")
        public String getComments() {
            return comments;
        }
Partially update row in data.table

Partially update row in data.table


By : SuperCuke
Date : March 29 2020, 07:55 AM
wish of those help The .SD cannot be used on the lhs of := for assigning. We need a character vector. Another option is set
code :
j1 <- which(names(dt) %in% c('cyl', 'wt'))
j2 <- j1[1]:j1[2]
for(j in seq_along(j2)){
   set(dt, i = 1, j = j2[j], value = vec[j])
 }

head(dt)
#    mpg cyl disp  hp drat    wt  qsec vs am gear carb
#1: 21.0   1    2   3 4.00 5.000 16.46  0  1    4    4
#2: 21.0   6  160 110 3.90 2.875 17.02  0  1    4    4
#3: 22.8   4  108  93 3.85 2.320 18.61  1  1    4    1
#4: 21.4   6  258 110 3.08 3.215 19.44  1  0    3    1
#5: 18.7   8  360 175 3.15 3.440 17.02  0  0    3    2
#6: 18.1   6  225 105 2.76 3.460 20.22  1  0    3    1
DynamoDb Nodejs - Put and Update table

DynamoDb Nodejs - Put and Update table


By : Wilson Filho
Date : March 29 2020, 07:55 AM
it helps some times As i can see that your createTable() and describeTable() Syntax are right but update and insert commands are wrong.
In your insert command there should be putItems() and in update there should be updateItem.
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