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Exposed | pgjdbc | |
---|---|---|
28 | 14 | |
7,879 | 1,416 | |
1.2% | 2.3% | |
9.5 | 9.3 | |
3 days ago | about 18 hours ago | |
Kotlin | Java | |
Apache License 2.0 | BSD 2-clause "Simplified" License |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Exposed
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Drizzle is just as unready for prime-time as Prisma, what else is there?
So is it like Exposed for Kotlin which is a typesafe Kotlin DSL for building sql queries? I’ve been looking for something like this in typescript! https://github.com/JetBrains/Exposed
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Database Testing with Testcontainers and Kotlin Exposed ORM
object TestDatabase { private val mySQLContainer: MySQLContainer = MySQLContainer("mysql:8.0.26").apply { withDatabaseName("test-db") withUsername("test-user") withPassword("test-password") start() // Start the container } init { val config = HikariConfig().apply { jdbcUrl = mySQLContainer.jdbcUrl username = mySQLContainer.username password = mySQLContainer.password driverClassName = "com.mysql.cj.jdbc.Driver" maximumPoolSize = 10 } val dataSource = HikariDataSource(config) // This doesn't connect to the database but provides a descriptor for future use // In the main app, we would do this on system start up // https://github.com/JetBrains/Exposed/wiki/Database-and-DataSource Database.connect(dataSource) // Create the schema transaction { SchemaUtils.create(Users) } } }
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I'm creating a REST API using KTOR. What's the best ORM to go with KTOR ?
Exposed SQL is pretty good.
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speed of a left join with millions of rows
I am using Kotlins Exposed DSL to access my postgreSQL database. I am running an SQL query which involves doing a one-to-many left join, with the first table having tens of thousands of rows and the second table having millions of rows. The database is stored locally on the machine. I would expect the returned query to be less than one thousand rows.
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Return a nested list of child table using Kotlin Exposed Dao
I understand that `referrersOn` and `referencedOn` can be used, however in the documentations StarWars example, the child table needs to have a column indicating the parent_id row it is joined to. This does not work in my case as my child table can be associated to multiple parent_ids.
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Replicating Jetbrains Exposed Star Wars Example in IntelliJ Scratch file
I am following this wiki to learn kotlin exposed. It contains an example of 'Referencing' using Star Wars data. I would like to create a scratch and/or console file in IntelliJ which reproduces this simple example. However When I try to run the code I get errors (see below). Is there something I am missing here?
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How are you all handling database persistence?
Exposed by JetBrains https://github.com/JetBrains/Exposed
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Why people don't like Java?
Alternatively there are... hybrid solutions like Kotlin's https://github.com/JetBrains/Exposed or https://jdbi.org/ that don't quite... do all the heavy lifting for querying but allow you to sorta stitch queries together manually.
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Using PostgreSQL as an Append-only Datastore with Kotlin and Exposed
In our last episode (https://youtu.be/Uza\_dWsNMUs) we worked out how to save stock items in PostgreSQL (https://www.postgresql.org/) using the JetBrains Exposed library (https://github.com/JetBrains/Exposed). This time we refactor our existing file-based storage, extracting an interface that we can implement with files, in-memory, or with Exposed. For the database version, instead of replacing items in a table when they change, we choose to implement an append-only datastore. This keeps all the old versions of every row, using a query to select the latest versions when we want to see the current state. This has the advantage that we can rebuild the state of our system if things go wrong, and may also be faster than amending when we consider transactions. This is part 62 of an exploration of where a Test Driven Development implementation of the Gilded Rose stock control system might take us in Kotlin. You can see the whole series as a playlist https://www.youtube.com/playlist?list=PL1ssMPpyqociJNwykAOB9\_KEZVW7BW7m2 and the code on GitHub https://github.com/dmcg/gilded-rose-tdd If you like this, you’ll probably like my book Java to Kotlin, A Refactoring Guidebook (http://java-to-kotlin.dev). It's about far more than just the syntax differences between the languages - it shows how to upgrade your thinking to a more functional style. I have some free time between producing videos and working for team Gilded Rose. If you like these videos I'd like to work with you - please get in touch - [email protected]
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Writing to db
I have used hikari and exposed to do this in the past with postgres, although other dialects are supported.
pgjdbc
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Password may not contain: select, insert, update, delete, drop
The method doAppendEscapeLiteral (Line 66) is a good example; https://github.com/pgjdbc/pgjdbc/blob/master/pgjdbc/src/main...
I didn’t take notes all the way down, but at the end of the day this method is invoked when a prepared statements’ parameters are being bound
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Everything People Don't Get About CVEs
Let's take CVE-2022-21724 which has a base score of 9.8 - Critical from NVD. This vulnerability has the following description on GitHub link:
- For daily Java programmers: after almost one decade of Java 8, are streams and lambdas fully adopted by the Java community?
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KTor and non-blocking sql
Virtual threads are great but db drivers still have to tweak (mainly to remove synchronized I/O) to be compatible with loom. Postgres just recently merged the changes for loom https://github.com/pgjdbc/pgjdbc/issues/1951
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loom and database drivers
You can see it for example in the Postgres driver here or the MS SQL driver here. Oracle of course has already released their driver as Loom ready.
- Embracing Virtual Threads with Spring
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Java 19
See here for details, one of the Project Loom mainainers chimes in with the bad news -- looks like a Loom supported solution is a ways off, so rewriting library/application code that uses synchronized is the only way to actually benefit from Loom's virtual threads.
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Why is Spring so slow in TechEmpower benchmark?
Any chance you could add a thought / opinion to https://github.com/pgjdbc/pgjdbc/issues/1951 ? Around synchronized & ReentrantLock etc. Any input would be greatly appreciated.
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I feel like this should be in every model, class and function just to be sure.
This is about types defined outside your business and that means you possibly don't have a chance to do better, e.g. PgPreparedStatement from PostreSQL driver.
- Postgres Java lib returns wrong numeric value after 5 reads
What are some alternatives?
Ktorm - A lightweight ORM framework for Kotlin with strong-typed SQL DSL and sequence APIs.
pgjdbc-ng - A new JDBC driver for PostgreSQL aimed at supporting the advanced features of JDBC and Postgres
SQLDelight - SQLDelight - Generates typesafe Kotlin APIs from SQL
HikariCP - 光 HikariCP・A solid, high-performance, JDBC connection pool at last.
kotlin-jpa-specification-dsl - This library provides a fluent DSL for querying spring data JPA repositories using spring data Specifications (i.e. the JPA Criteria API), without boilerplate code or a generated metamodel.
Trino - Official repository of Trino, the distributed SQL query engine for big data, formerly known as PrestoSQL (https://trino.io)
requery - requery - modern SQL based query & persistence for Java / Kotlin / Android
jOOQ - jOOQ is the best way to write SQL in Java
kwery - Kwery is an SQL library for Kotlin
zgc - The Z Garbage Collector https://wiki.openjdk.org/display/zgc
kotlin-nosql - NoSQL database query and access library for Kotlin
H2 - H2 is an embeddable RDBMS written in Java.