DynamicQuery | An improvement of the original Dynamic Linq MSDN sample | Database library
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kandi X-RAY | DynamicQuery Summary
An improvement of the original Dynamic Linq MSDN sample.
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QUESTION
I have a method that receives a dto in which many of its fields are used to make a dynamic query based on the non-null fields. I am accessing each field by reflection in a lambda to add the non-null fields to the dynamic query. This works, but I don't know how to get that list to return it.
...ANSWER
Answered 2021-Feb-11 at 19:28It seems that you don't want to call mongoTemplate.find
or PreOrderMapper.mapToDtos
inside of the lambda, as the lambda will be executed once for each local field.
But from your code I'd guesstimate that you really want to execute the query after having built the dynamicQuery
object from all fields.
And since you already manipulate the object referenced by dynamicQuery
inside the lambda, it's as simple as moving the code to actually execute it out of the lambda:
QUESTION
We have a query with a common structure that we use under different circumstances (where clause is different)
So we have something like this
...ANSWER
Answered 2021-Jan-29 at 08:56TL;DR: You can't use CTEs with jOOQ 3.15's model API
Some background on the jOOQ model API vs DSL API distinctionThe very old jOOQ 1.0 only had what is now called the "model API", a mutable, procedural API with setters (no getters), where you can manipulate dynamic SQL.
jOOQ 2.0 introduced the DSL API, which is what most people are using today. The fact that the DSL API mimicks the SQL language helps users discover jOOQ API much more easily. Everything is named exactly as expected. With the exception of a few quirks in the areas of CTE and derived tables, you can write jOOQ-SQL almost just like actual SQL.
The model API was not deprecated, but wrapped by the DSL API, and kept around:
- for backwards compatibility reasons
- because some people seemed to like the procedural approach
You can't do anything with the model API that you couldn't do with the DSL API as well, though a more functional programming style may be helpful when doing this with the DSL API. See: https://blog.jooq.org/2017/01/16/a-functional-programming-approach-to-dynamic-sql-with-jooq
The future of jOOQWhile the model API is still getting some new clauses support for SELECT
, INSERT
, UPDATE
, DELETE
statements, there are some statements that are not available in a model API form. These include MERGE
, TRUNCATE
, all DDL statements, all procedural statements. And, the WITH
clause.
The strategy is to eventually deprecate the model API, because the redundancy creates a lot of extra work that is better invested elsewhere. There are also subtle bugs when people call model API methods in unexpected order, i.e. an order that is not possible through the DSL API.
- In a first step, pretty soon, jOOQ will inverse the relationship between APIs: https://github.com/jOOQ/jOOQ/issues/11241. The model API will be the auxiliary wrapper of the DSL API for those who rely on it for backwards compatibility. It isn't unlikely that the model API will even be extracted into a separate compatibility module, to discourage its use in new code
- In a next step, with the dependencies inversed, the DSL API can finally become consistently immutable, which is what many users expect, and to their surprise, find lacking: https://github.com/jOOQ/jOOQ/issues/9047
- Eventually, the model API will be deprecated, and then dropped
You can still use it today, and the deprecation and removal will be done over a long period of time, so there's no hurry in getting off this API (as always with jOOQ). But in the context of your question, it's good to see that jOOQ will not invest in adding too many features to it, anymore. CTE support won't be added to the model API.
WorkaroundsYou can, of course, work around this limitation, because internally, the model API is CTE capable:
- You could use reflection to add new CTEs to the
SelectQuery
internal representation. I won't document how this works, here, because it's never a good idea to document these things :) - You could start creating a query using the DSL API, and then extract the internal
SelectQuery
representation usingSelectFinalStep.getQuery()
, and continue working from there.
QUESTION
I see opportunities to minimize network bytes transfer of my website, but can't come up with a proper solution.
In Gatsby, I make use of .mdx files. In these files I can use React Components, such as:
There are dozens of cards defined in a .json file, which can be used across the website by just calling this component in de mdx file and passing their id.
The Cards component looks like somewhat like this:
...ANSWER
Answered 2020-Dec-19 at 04:33GraphQL queries are run ONCE when you run gatsby develop
or gatsby build
. This is a counterintuitive way how Gatsby works but read it yourself:
Gatsby uses GraphQL at build-time and not for live sites.
More information about the gatsby build process and how GraphQL factors into it.
This means you already built your component the way you are supposed to. During build all your cards are queried and kept in memory. When creating the HTML for your pages with your cards, only the cards with your ID are used to build your page. Thus the user only sees gets transmitted the pages with filtered IDs.
You can double check if really only the cards with the ID are inside your page:
- run
gatsby clean
: make sure old fragments of your page are removed - run
gatsby build
: Create your site from scratch - Check your
public
folder in your project root. This is the classic webpage that gatsby builds. Navigate to your pages with your cards for example/public/blog/example-page-with-card
. Take a look inside the HTML of the page: Does it contain all the cards or just the one with the IDs you need?
QUESTION
I'm using Spring 2.4 and jUnit 5.7.
I'm trying to use a repository create for test but I'm getting "No qualifying bean of type".
I annotated the repository @TestComponent.
...ANSWER
Answered 2020-Nov-20 at 18:08I just solved this problem. The first step was change the repository to extends JpaRepositoryImplementation. Then it throws a UnsupportedOperationException. Diging a bit I reach this post and I changed all the Collections.emptyList and Arrays.asList() to instanciate it as new ArrayList<>(). Then the test run properly.
QUESTION
enter image description hereWhat I'm trying is fetching columns from the user to which the user entered, The Good thing is Columns are getting fetched and the bad thing is the columns that I had applied conditions are not working.Can anyone help me out? I want a query that works for the filter option as in many websites to filter any product or something. Newbie here!!!
...ANSWER
Answered 2020-May-04 at 16:50i think you should make a match object array it will make your code more neat and hoping that it will solve your problem
Ex:
QUESTION
I need to create a spring boot batch job in which, I need to fetch data from mongoDB where I don't have info about collection name & fields to fetch at coding time. I get this info only when the batch starts. E.g. When batch starts, I can read properties file where I get collection name by 1 property & another property gives list of fields to fetch, third filed provides criteria/condition for query So, due to this, I cant have a Java POJO defined which have mapping for collection or I cant create any MongoRepository\Template (collection name is known at runtime).
What I want to know is, just like plain old native SQL, if i get to know fields name & table name, on the fly, SQL can be build & can be fired to get the data:
...ANSWER
Answered 2020-Apr-03 at 14:01You can use MongoTemplate
for this which can be autowired as spring provides and configures it for you automatically.
It has a
QUESTION
I am using MongoTemplate to construct a query which searches for a String (exactly like LIKE %abc%
in SQL) across multiple fields. So, I have an object like:
ANSWER
Answered 2019-Dec-26 at 16:25Criteria freeTextCriteria = new Criteria();
freeTextCriteria.orOperator(Criteria.where("location").regex(".*"+ freeText +".*"), Criteria.where("badge").regex(".*"+ freeText +".*"));
Query dynamicQuery = new Query(freeTextCriteria);
mongoTemplate.find(dynamicQuery, .class, "collectionName");
QUESTION
I need to aggregate some data using java and Mongodb.
So my JS script it's that:
...ANSWER
Answered 2019-Dec-05 at 16:42I have one solution, but I do not know if it is a better solution, so, let's go.
Because the Entity represented inside the Post Domain is one DBRef, the MongoDB does not parse the entire Stringo to the PostSummary.Class
QUESTION
I am trying to create a generic filter to split file on the condition from the Yaml file.
My code is running Pandas but as the environment is not having Pandas module I am trying to achieve it through CSV library.
When I am hard coding the value at q its working but when I am trying to pass it from the config file its not working. Also I want pass multiple checks on the same column like('','Balance). So Asset
goest to one file and ('','Balance)
in another.
ANSWER
Answered 2019-Dec-04 at 13:31The YAML configuration file format is not particularly convenient for this, and yaml
is not a standard Python module. I would probably go for something like regular expressions instead of a YAML file. But just to sort out the immediate problems, the problem here is that you are mixing up Python syntax and literal quoting characters. You are assembling a string containing literal double quotes around Asset
for example, where your CSV file does not contain double quotes around this value; and so you are effectively comparing if 'Asset' == '"Asset"'
which of course is False
.
The following might not do exactly what you want, but should at least demonstrate a rough first cut of what I think you are trying to do here.
QUESTION
I have the following query in my code:
...ANSWER
Answered 2019-Oct-31 at 11:18I have found out that if you use the "search" method and pass the "version" parameter as null, you get only the latest versions of the JournalArticle:
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