[JPA] unique column

@Column(name="column" , unique=true) long column @Entity @Table( name="tableName", uniqueConstraints={ @UniqueConstraint( name={"contstraintName"} columnNames={"col1", "col2"} ) } ) @Data public class Entity{ @Column(name="col1") int col1; @Column(name="col2") int col2; }
공부 2022. 8. 9. 23:23
[kotlin] `list` to `map` {key: index}

IntStream.range(0, alphabet.size()) .boxed() .collect(toMap(alphabet::get, i -> i)); https://stackoverflow.com/questions/33138577/how-to-convert-list-to-map-with-indexes-using-stream-java-8 How to convert List to Map with indexes using stream - Java 8? I've created method whih numerating each character of alphabet. I'm learning streams(functional programming) and try to use them as often as poss..
공부 2022. 8. 9. 23:22
[python] `math.isnan()`

https://www.delftstack.com/ko/howto/python/check-for-nan-values-python/#math.isnan%25ED%2595%25A8%25EC%2588%2598%25EB%25A5%25BC-%25EC%2582%25AC%25EC%259A%25A9%25ED%2595%2598%25EC%2597%25AC-python%25EC%2597%2590%25EC%2584%259Cnan%25EA%25B0%2592-%25ED%2599%2595%25EC%259D%25B8 Python에서 NaN 값 확인 이 자습서에서는 Python에서 NaN 값을 확인하는 방법을 보여줍니다. www.delftstack.com
공부 2022. 8. 9. 23:20
[kotlin] val list = mutableListOf(1, 2, 3) + mutableListOf(4, 5)

val list = mutableListOf(1, 2, 3) println(list) // [1, 2, 3] list += listOf(4, 5) println(list) // [1, 2, 3, 4, 5] https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/mutable-list-of.html mutableListOf - Kotlin Programming Language kotlinlang.org
공부 2022. 8. 9. 23:12
[python] ImportError: cannot import name 'soft_unicode' from 'markupsafe' (/Users/seunggab.kim/seunggabi/project/umzzal-kim/venv/lib/python3.8/site-packages/markupsafe/__init__.py)

pip3 install markupsafe==2.0.1 https://github.com/aws/aws-sam-cli/issues/3661 ImportError: cannot import name 'soft_unicode' from 'markupsafe' in Release 1.38.0 · Issue #3661 · aws/aws-sam-cli I'm building the sam project on github action and since the upgrade of sam-cli to 1.38.0, i'm getting following error when i build project Python version: 3.10.2 & 3.8.12 (Tried both ve... github.com
공부 2022. 8. 9. 01:08
[spark] NotSerializableExcetpion (org.apache.spark.SparkException: Task not serializable)

https://wonyong-jang.github.io/spark/2021/06/15/Spark-Serialization.html [Spark] 아파치 스파크 Serialization - SW Developer Spark를 이용하여 개발을 진행할 때 발생하는 가장 일반적인 문제 중 하나는 NotSerializableExcetpion이다. org.apache.spark.SparkException: Task not serializable at org.apache.spark.util.ClosureCleaner$.ensureSerializable(ClosureCl wonyong-jang.github.io
공부 2022. 8. 9. 00:20
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