sequence-generators | 易学教程

@SequenceGenerator on class annotated with @MappedSuperclass

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问题 I have following structure of my entities: @MappedSuperclass public abstract class BaseEntity { @Id @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "seqGenerator") private Long id; } @MappedSuperclass @Inheritance(strategy = InheritanceType.SINGLE_TABLE) @SequenceGenerator(name = "seqGenerator", sequenceName = "DICTIONARY_SEQ") public abstract class Intermed extends BaseEntity {} @Entity public class MyEntity1 extends Intermed {} @Entity public class MyEntity2 extends Intermed

asynchronous python itertools chain multiple generators

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问题 UPDATED QUESTION FOR CLARITY: suppose I have 2 processing generator functions: def gen1(): # just for examples, yield 1 # yields actually carry yield 2 # different computation weight yield 3 # in my case def gen2(): yield 4 yield 5 yield 6 I can chain them with itertools from itertools import chain mix = chain(gen1(), gen2()) and then I can create another generator function object with it, def mix_yield(): for item in mix: yield item or simply if I just want to next(mix) , it's there. My

How to implement a custom String sequence identifier generator with Hibernate

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问题 I'm using hibernate with spring, h2 and liquibase and I'm trying to make a custom String id generator for my entities by taking example with this blog post but I'm getting an error : Caused by: org.hibernate.id.IdentifierGenerationException: Unknown integral data type for ids : java.lang.String Here my SequenceStyleGenerator code : public class CTCIDGenerator extends SequenceStyleGenerator { @Override public Serializable generate(SessionImplementor session, Object obj) { if (obj instanceof

Hibernate cfg.xml configuration for sequence generator

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问题 Fellow developers, I'm finding it hard to get the sequence generation configured. I inherited a persistent class with the following id field definition: @Id @GeneratedValue(strategy= GenerationType.AUTO) private Long id; All of my classes inherit from this class. The main thing I want: I need to override the strategy of id generation to use HiLo. It has to be in the cfg.xml since it's the only place that I have control over. This thing looked promising: <property name="hibernate.id.new

Logic to generate an alphabetical sequence in C# [closed]

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问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 4 years ago . The sequence should go like this. A-Z,AA-AZ,BA-BZ,CA-CZ,.......,ZA-ZZ After ZZ it should start from AAA . Then AAA to ZZZ and then AAAA to ZZZZ and so on. This sequence is pretty much like that of an Excel sheet. Edit: Added my code private void SequenceGenerator() { var numAlpha

Generate Sequence A to Z and then 0 to 9, from A to 999

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问题 Thanks in advance, I want to generate sequence from A to Z and after that 0 to 9 and after that it will move to AA, AB, AC ..... AZ, A0, A1 .... A9, BA and so on i had tried to implement it as following public static string GenerateSequence(List<string> inputList) { string identifierCode = "A"; //check if list does not contains any element if (!inputList.Any()) return identifierCode; //sort codes inputList.Sort(); //get last code var lastItem = inputList[inputList.Count - 1]; //split code var

asynchronous python itertools chain multiple generators

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UPDATED QUESTION FOR CLARITY: suppose I have 2 processing generator functions: def gen1(): # just for examples, yield 1 # yields actually carry yield 2 # different computation weight yield 3 # in my case def gen2(): yield 4 yield 5 yield 6 I can chain them with itertools from itertools import chain mix = chain(gen1(), gen2()) and then I can create another generator function object with it, def mix_yield(): for item in mix: yield item or simply if I just want to next(mix) , it's there. My question is, how can I do the equivalent in asynchronous code? Because I need it to: return in yield (one

Replace @SequenceGenerator since its deprecated

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I have a problem with @SequenceGenerator : @SequenceGenerator(name="pk_user_id", sequenceName="seq_user_id", allocationSize=1) @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="pk_user_id") When the application starts up it shows warning: WARN 7388 --- [ main] org.hibernate.orm.deprecation : HHH90000014: Found use of deprecated [org.hibernate.id.SequenceHiLoGenerator] sequence-based id generator; use org.hibernate.id.enhanced.SequenceStyleGenerator instead. See Hibernate Domain Model Mapping Guide for details I tried to find out how I can replace a deprecated code with a new one but

How to implement a custom String sequence identifier generator with Hibernate

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I'm using hibernate with spring, h2 and liquibase and I'm trying to make a custom String id generator for my entities by taking example with this blog post but I'm getting an error : Caused by: org.hibernate.id.IdentifierGenerationException: Unknown integral data type for ids : java.lang.String Here my SequenceStyleGenerator code : public class CTCIDGenerator extends SequenceStyleGenerator { @Override public Serializable generate(SessionImplementor session, Object obj) { if (obj instanceof Identifiable) { Identifiable identifiable = (Identifiable) obj; Serializable id = identifiable.getId();

Replace @SequenceGenerator since its deprecated

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问题 I have a problem with @SequenceGenerator : @SequenceGenerator(name="pk_user_id", sequenceName="seq_user_id", allocationSize=1) @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="pk_user_id") When the application starts up it shows warning: WARN 7388 --- [ main] org.hibernate.orm.deprecation : HHH90000014: Found use of deprecated [org.hibernate.id.SequenceHiLoGenerator] sequence-based id generator; use org.hibernate.id.enhanced.SequenceStyleGenerator instead. See Hibernate Domain