Zend 1.8 Geeks!
I always use model_mapper to update insert and fetch data from the db by this example :
$a=somthin;
$y=qwe;
$dataMapper = new model_mapper_data();
$dataModel = new model_data();
$dataEntity=$dataModel->AA=$a ;
=> $dataMapper->update($dataEntity,'x'=$y);
Now on the last line the Mapper generates a query to update all table row columns AA and rest stored in the data-model where 'x'=$y.
isn't there a way to force the Mapper to update specific columns only?
Well all what you need is to not give the update method the model entity Since the model initialize objects for all of the columns .
Just give it an array of the columns names you would like to modify and Pair them to their values like below :
Mapper->update('column_name'=>value);
Related
I have a situation where in a table called tokens I have a column called data
The data columns consist of something like this as a '{}'::jsonb
{"recipientId": "xxxxxxxx"}
My goal is to have as follow to update old data to new DB design and requirements
{"recipientIds": ["xxxxxxxx"]}
The reason is that the naming was changed and the value will be an array of recipients.
I don't know how to achieve this
change recipientIdto recipientIds
change the value format to an array but to not loose the data
Also this need to be done only where I have a type in ('INVITE_ECONSENT_SIGNATURE', 'INVITE_ECONSENT_RECIPIENT')
The table looks as follow is a simple table which contains few columns.
The data is the only one as '{}'::jsonb.
id
type
data
1
type1
data1
2
type2
data1
As an edit what I tried to do and partially solved my problem but cannot understand how to se the value to be [value]
update
"token"
set
"data" = data - 'recipientId' || jsonb_build_object('recipientIds', data->'recipientId')
where
"type" in ('INVITE_ECONSENT_RECIPIENT')
I can have now a recipientids: value but need to have recipientids: [value]
You were close, you need to pass an array as the second parameter of the jsonb_build_object() function:
(data - 'recipientId')||jsonb_build_object(
'recipientIds',
jsonb_build_array(data -> 'recipientId')
)
I'm converting a one-to-one relationship into a one-to-many relationship. The old relationship was just a foreign key on the parent record. The new relationship will be an array of foreign keys on the parent record.
(Using Postgres dialect, BTW.)
First I'll add a new JSONB column, which will hold an array of UUIDs.
Then I'll run a query to update all existing rows such that the value from the old column is now stored in the new column (as the first element in an array).
Finally, I'll remove the old column.
I'm looking for help with step 2: writing the update statement that will update all rows, setting the value of the new column based on the value of the old column. Basically, I'm trying to figure out how to express this SQL query using Sequelize:
UPDATE "myTable"
SET "newColumn" = json_build_array("oldColumn")
-- ^^ this really works, btw
Where:
newColumn is type JSONB, and should hold an array (of UUIDs)
oldColumn is type UUID
names are double-quoted because they're mixed case in the DB (shrug)
Expressed using Sequelize sugar, that might be something like:
const { models } = require('../sequelize')
await models.MyModel.update({ newColumn: [ 'oldColumn' ] })
...except that would result in saving an array that contains the string "oldColumn" rather than an array whose first element is the value in that row's oldColumn column.
My experience, and the Sequelize documentation, is focused on working with individual rows via the standard instance methods. I could do that here, but it'd be a lot better to have the database engine do the work internally instead of forcing it to transfer every row to Node and then back again.
Looking for whatever is the most Sequelize-idiomatic way of doing this, if there is one.
Any help is appreciated.
Hi i am trying to create a search query with entityframework
I am doing something like this
model = _context.articles.where(combination 1)
model2 = _context.tags.where(combination 2).select(x=> new {article=..})
model3 = _context.keywords.where(combination 3).select(x=> new {article=..})
I am not generating one model as its not possible or out of my capacity to create such query but now since i have 3 models with similar columns all i want to do is merge them into one and remove duplicates.
I don't know if this is good approach but is it possible?
Use union and distinct methods as following:
var result = model.Union(model2).Union(model3).Distinct().ToList();
I am using slick with play2.
I have multiple fields in the database which are managed by the database. I don't want to create or update them, however I want to get them while reading the values.
For example, suppose I have
case class MappedDummyTable(id: Int, .. 20 other fields, modified_time: Optional[Timestamp])
which maps Dummy in the database. modified_time is managed by the database.
The problem is during insert or update, I create an instance of MappedDummyTable without the modified time attribute and pass it to slick for create/update like
TableQuery[MappedDummyTable].insert(instanceOfMappedDummyTable)
For this, Slick creates query as
Insert INTO MappedDummyTable(id,....,modified_time) Values(1,....,null)
and updates the modified_time as NULL, which I don't want. I want Slick to ignore the fields while updating and creating.
For updating, I can do
TableQuery[MappedDummyTable].map(fieldsToBeUpdated).update(values)
but this leads to 20 odd fields in the map method which looks ugly.
Is there any better way?
Update:
The best solution that I found was using multiple projection. I created one projection to get the values and another to update and insert the data
maybe you need to write some triggers in table if you don't want to write code like row => (row.id,...other 20 fields)
or try use None instead of null?
I believe that the solution with mapping non-default field is the only way to do it with Slick. To make it less ugly you can define function ignoreDefaults on MappedDummyTable that will return only non default value and function in companion object to MappedDummyTable case class that returns projection
TableQuery[MappedDummyTable].map(MappedDummyTable.ignoreDefaults).insert(instanceOfMappedDummyTable.ignoreDefaults)
I have a hierarchical XML file received from client, i need to store it in Hbase database, as i am new to the Hbase i not able to understand how to approach, can you please guide me how should i proceed for this hierarchical data storage to Hbase.
Thanks in advance
Hbase stores data in Column wise format. Each record must have a unique key. The sub columns can be created on the fly but not the main columns.
For example condider this xml.
<X1>
<X2 name = "uniqueid">1</X2>
<X3>
<X4>value1</X4>
<X5>value2</X5>
<X6>
<X7>value3</X7>
<X8>value4</X8>
</X6>
</X3>
<X7>value5</X7>
</X1>
In this case, the main column family would be X3 and X7. Row Id can be taken from X2.
You can construct a Hbase entry equivalent to this using java api like,
Put p = new Put("/*put the unique row id */ ".getBytes() );
p.add("X3".getBytes(), "X4".getBytes(), value1.getBytes());
where the first argument is the column family and the second one is called the column qualifier(sub column).
You can also use 2 argument constructor like,
p.add("X3:X6:X7".getBytes(),value3);
then table.put(p). Thats it!!!