kotlin-jdbc | thin library that exposes JDBC API | Database library
kandi X-RAY | kotlin-jdbc Summary
kandi X-RAY | kotlin-jdbc Summary
:information_source: This branch is a rework with breaking changes to refactor models and related classes to eliminate having to specify identifier quoting in the model by creating the model for a database session. Which makes sense for a database model class. Biggest change is that the model now takes two template arguments: main model class and its associated data class with an optional session instance and identifier quoting string. If session is not given or null then default session will be used. If quote if not given or null then the connection metaData.identifierQuoteString will be used, anything else will use whatever string is passed in. Unless your jdbc driver does not provide identifier quoting, there is no need to use anything but the default. Companion object now only has the table name constant string. All other functions implemented in the Model with two abstract members: toData() returning the data class for the model and operator invoke for the factory function for the model. To get another instance of a model myModel invoke the model instance as a function myModel(). For models that do not need a data class ModelNoData is also available which only takes a single template argument, as was the case for the Model class in previous releases. Having the session instance information in the model simplifies using models because session no longer has to be specified for every method performing database access. Additionally, list results are simplified because neither the session nor the extractor needs to be passed, with myModel.listData() variations can be used or myModel.listModel() variations. Additionally there is now an alias:String? = null argument available for sql generating functions which will add a table alias to the table name and use the alias for disambiguating column names. If generating queries with multiple tables, set the alias to empty string "" or the table name to have it added to the column references. An empty table alias or one equal to the table name will only be used for column references. Generate Kotlin-Model.groovy has been updated to generate the new model format from tables in the database and optionally use a model-config.json to provide table to generated model file.
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kotlin-jdbc Key Features
kotlin-jdbc Examples and Code Snippets
Lines of Code : 154License : Permissive (MIT)
Copyimport com.vladsch.kotlin.jdbc.*
val session = session("jdbc:h2:mem:hello", "user", "pass")
HikariCP.default("jdbc:h2:mem:hello", "user", "pass")
using(session(HikariCP.dataSource())) { session ->
// working with the session
}
HikariCP.defa db/
└── profileName
└── schema
└── V0_0_0
├── functions
│ └── sample-function.udf.sql
├── migrations
│ ├── 0.sample-migration.down.sql
│ └── 0.sample-migration.up.sql + kotlinParameter().ofFunction(0, kotlinFunction().withName("appendWhereClause"))
+ kotlinParameter().ofFunction(0, kotlinFunction().withName("sqlCall").definedInPackage("com.vladsch.kotlin.jdbc"))
+ kotlinParameter().ofFunction(0, kotlinFunction().w Community Discussions
Trending Discussions on Database
QUESTION
I want to be able to (at run time) create or alter a DB schema dynamically on a particular event (e.g. click of a button) using FormHandler microservice of Gramex.
...ANSWER
Answered 2022-Apr-08 at 06:20You can do it using queryfunction of FormHandler which can modify the query based on the query parameters passed in the url.
Refer the link below for more https://gramener.com/gramex/guide/formhandler/#formhandler-queryfunction
QUESTION
I am getting the following error while trying to upload a dataset to Hub (dataset format for AI) S3SetError: Connection was closed before we received a valid response from endpoint URL: "<...>".
So, I tried to delete the dataset and it is throwing this error below.
CorruptedMetaError: 'boxes/tensor_meta.json' and 'boxes/chunks_index/unsharded' have a record of different numbers of samples. Got 0 and 6103 respectively.
Using Hub version: v2.3.1
...ANSWER
Answered 2022-Mar-24 at 01:06Seems like when you were uploading the dataset the runtime got interrupted which led to the corruption of the data you were trying to upload. Using force=True while deleting should allow you to delete it.
For more information feel free to check out the Hub API basics docs for details on how to delete datasets in Hub.
If you stop uploading a Hub dataset midway through your dataset will be only partially uploaded to Hub. So, you will need to restart the upload. If you would like to re-create the dataset, you can use the overwrite = True flag in hub.empty(overwrite = True). If you are making updates to an existing dataset, you should use version control to checkpoint the states that are in good shape.
QUESTION
I ran into an issue that I haven't found a solution to yet. I have a collection with dozens of documents that every one of the documents contains a list (let's use the name 'list' as a key for that list) with ids of other documents(they are connected in some way).
some of the documents in the collection were deleted and I try to find all the documents that contain the ids of documents that do not exist anymore in the collection.
example:
As to the example above: I want to get the document with the id : 5e3266e9bd724a000107a902 because it contains a list with the id 5e32a7f7bd724a00012c1104 that does not exist anymore.
...ANSWER
Answered 2022-Mar-02 at 03:10Here is a solution that works exploiting $lookup on the same collection (think "self-JOIN"):
QUESTION
Given a connection to the PostgreSQL database for user 'Alice', is there a statement that could be executed to switch to user 'Bob'?
Motivation: Looking to avoid having separate pools for each user (i.e. re-use a connection that was previously used by another user).
...ANSWER
Answered 2022-Mar-01 at 22:09In PgAdmin open part Login/Group roles. Right click and in opened window enter new user, set permission and defined password. After refresh you will see e.g. Alice in Login/Group roles. After that open database with logged user. Click on something like mondial/postgres@PostgresSQL (db/user@server) and choose new connection. Chose which db wish to use and user wich will be connected on db.
After that you will have mondial/Alice@PostgresSQL
QUESTION
ANSWER
Answered 2022-Feb-28 at 12:43The problem consist from creating connection in separate file (must be create in App).
QUESTION
As the title suggests I'm wondering how to create an effective index for GROUP BY queries in CosmosDB.
Say the documents look something like:
...ANSWER
Answered 2021-Sep-27 at 20:51Currently GROUP BY does not not yet use the index.
This is currently being worked on. I would revisit sometime towards the end of the year to verify it is supported.
QUESTION
i have a database field that is set to decimal, while in my Go project i am having problem choosing which datatype can be use. each time i send a create reuquest to my code, i get a "cannot marshal 'decimal' into #golang datatype#
this my database schema
...ANSWER
Answered 2022-Feb-15 at 12:13If you look into documentation for Gocql package, then you will see that the decimal is mapped to the Go's infDec data type (see its doc) so you need to use it instead of Float64.
QUESTION
I want to copy one big database table to another. This is my current approach:
...ANSWER
Answered 2022-Jan-20 at 12:45You can also "copy on database level" from within ABAP SQL using a combined INSERT and SELECT:
QUESTION
- Hi, we are trying to upgrade 2.0.202 from 1.4.200. We are getting an error related to running our tests. While persisting data we are getting below error. Any suggestions?
Caused by: org.h2.jdbc.JdbcSQLIntegrityConstraintViolationException: NULL not allowed for column "***"; SQL statement:
...ANSWER
Answered 2022-Jan-31 at 01:05You cannot use H2 2.0.202 with Hibernate ORM 5.6, because H2Dialect in Hibernate ORM produces invalid SQL for H2, H2 2.x is more restrictive and doesn't accept it by default.
H2 2.0.204 and later versions (current version is 2.1.210) have a LEGACY compatibility mode, it can be enabled by appending ;MODE=LEGACY to JDBC URL. This mode provides some limited compatibility with old versions of H2.
This trick shouldn't be required for Hibernate ORM 6.0 when it will be released.
Edited
Changes for H2 2.x.y were backported to Hibernate ORM 5.6.5.
QUESTION
I am confused in choosing database service for my flutter application. I started using firebase but as it is based on NoSQL , But if i am getting the need for rows and columns for my data which backend service should i use!.
...ANSWER
Answered 2022-Jan-23 at 23:20I think it depends on how you want to access the data. If you're wanting to stream and push notifications, I would stick with Firebase. If you just need to get and post data, focus more on api implementation. With a solid rest api, you can change up your database/backend all you want and just have to update the api, not your app.
I, personally, suggest searching around for data modeling techniques in Firebase. Check out the Fireship channel on youtube. In his channel's videos, search for modeling and you'll find a ton of info on Firebase data modeling. Many will reference Angular, but the techniques are the same.
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