FooDB | Your own custom-build database | SQL Database library
kandi X-RAY | FooDB Summary
kandi X-RAY | FooDB Summary
Your own custom-build database
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QUESTION
I need to create a new inner List and use that to set the outer list. How can I do using the flatMap. fooList is a list of FooDb object from which I create list of Foo object.
...ANSWER
Answered 2019-Sep-27 at 08:58You don't need flatMap
. You have two map
operations:
List -> List)>
, andList -> List
which is required for the former.
QUESTION
I'm trying to setup Spring boot RESTful API with Hibernate, JPA and PostgreSQL 9.5 into a Linux server. I'm not very experienced with any of the technologies, but got the task anyway. I'm getting following errors when running jar on server:
...ANSWER
Answered 2019-Jan-14 at 07:39Figured that out long time ago obviously, but finally remembered to put it here. So I finally used own class for settings instead of application.properties. Added all the settings into HashMap and injected that into StandardServiceRegistryBuilder which was injected into MetadataSources. Then I had to annotate all the classes into MetadataSources instance and make a new instance of SchemaExport using metadatasources as parameter.
QUESTION
I have a many to many table that references. Itself it sounds crazy so here's an image for a better view of the problem https://i.stack.imgur.com/lj2zZ.png
I use guids as primary and foreign keys.
When I try to add a new instance of Foo
to the database which has a relationship to some foo from the database, and on the exact moment when the line myDbContext.Set().Add(foo);
is passed, the Guid https://i.stack.imgur.com/WlFW9.png gets changed to https://i.stack.imgur.com/989nb.png
Code to create database:
...ANSWER
Answered 2018-Sep-05 at 19:41I believe the problem is with mappings Foo.Dependents <-> DependencyFoo.Dependent
and Foo.DependentsOf <-> DependencyFoo.DependentOf
.
The actual dependents/dependents of foo
should really be something like (pseudocode):
QUESTION
I am having issues creating a spring boot application that can dynamically connect to multiple databases, depending on user input. Basically the application runs the same sql query on different databases. modeling my attempt after this, i have received the following error:
...ANSWER
Answered 2018-Apr-11 at 03:37DataSourceBuilder.create().build()
is going to instantiate HikariDataSource
as it is the default DataSource as of SpringBoot 2.0. If you look into HikariDataSource source code the properties are jdbcUrl, username NOT url, user. So, you need to change property keys in application.properties file as follows:
QUESTION
I'm inserting 1000 documents in mongodb 3.6 at once using an unordered bulk via mongodb java api 3.6.1 and the method insertMany(List)
.
ANSWER
Answered 2018-Feb-27 at 10:54MongoBulkWriteException
contains a List
, each failed write will be represented by an element in this list. Each element in this list contains an index
attribute which is populated with the index of the element in the supplied list of documents.
So, you can use this index
to work out which of the supplied documents failed.
Here's a test case showing this in action:
QUESTION
I'm using React without JSX or Redux
Basically I want to create a div, than create list items for the array
...ANSWER
Answered 2018-Jan-27 at 00:25Use the .map() method!
QUESTION
I used spring boot + jdbctemplate and I have to use multi datasource, e.g.
...ANSWER
Answered 2017-Jun-27 at 11:10So I've done some debugging and found something which might explain what's happening. At this point I'm not sure if it's a bug (could be this one), but I have not been able to find any other documentation to clarify this either.
For reference this is spring-boot 1.5.4.
I started from the log, you can find below an excerpt, more specifically the line regarding DataSourceInitializer.init
(below with ==>
at the beginning):
QUESTION
I have two list containing an important number of object with each N
elements:
ANSWER
Answered 2017-Mar-27 at 16:23Assuming Java 8 and considering the fact that feedbackStatus may contain more than one element with the same ID.
- Transform the list into a Map using ID as key and having a list of elements.
- Iterate the list and use the Map to find all messages.
The code would be:
QUESTION
I have the following structure(s) that I need to merge into a single list of dicts.
I can change the syntax/structure of the secrets
list (into something else if easier).
ANSWER
Answered 2017-Mar-08 at 16:17For example:
QUESTION
I am trying to use flyway from maven and I have pom that looks like this with regard to flyway:
...ANSWER
Answered 2017-Jan-20 at 18:16The answers given by wemu are completely correct: it was necessary, as the pom is currently written, to do mvn compile rather than flyway:migrate. Moreover, wemu's subsequent suggestion about moving the configuration should make it possible to invoke Flyway directly which is probably the correct way to do things. I guess the error messages from the Flyway plugin are completely accurate: it did not see the authorization/db access configuration but I did not know enough about Maven to understand why and spent significant time thinking the info was wrong not merely unavailable to the plugin.
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