如何使用生成的索引将实体对象保存到已初始化的 h2 table 中？

Question

我有一个带有 h2 数据库的 spring 引导项目。 A table debug 从 schema.sql:

初始化

DROP TABLE IF EXISTS debug;
  
CREATE TABLE debug (
  id BIGINT PRIMARY KEY,
  dummycol VARCHAR(250) NOT NULL
);

data.sql:

INSERT INTO debug (id, dummycol) VALUES
  (0, 'foo'), 
  (1, 'ba');

为此，我必须将 spring.jpa.hibernate.ddl-auto=none 放入 application.properties。根据 documentation 这是 schema.sql 所必需的，但我发现在生成模式时使用另一个值，例如 create-drop （我从带注释的 classes 假设）加载脚本 data.sql 被忽略，因此 table 在启动后为空。

我定义了一个实体class:

@Entity
@Table(name = "debug")
@Data
@NoArgsConstructor
public class DebugE {

    @Id
    //@GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="id")
    private Long id;

    @Column(name="dummycol")
    private String dummy;
}

然后，我 subclass CrudRepository: public interface DebugRepository extends CrudRepository<DebugE, Long> 并将实体对象添加到 table

@Autowired
DebugRepository cr;
...
    DebugE d = new DebugE();
    d.setId(computeFreeId(cr))
    d.setDummy("foo1");
    cr.save(d);

到目前为止一切正常，但现在我想 id 自动设置。为此，我将 @GeneratedValue 添加到 class 并注释掉 d.setId，因为我希望框架为我做这件事。我对 GenerationType 没有偏好，到目前为止都不起作用：
AUTO,SEQUENCE:

o.h.engine.jdbc.spi.SqlExceptionHelper   : SQL Error: 90036, SQLState: 90036
o.h.engine.jdbc.spi.SqlExceptionHelper   : Sequence "HIBERNATE_SEQUENCE" not found; SQL statement:
call next value for hibernate_sequence [90036-200]
o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.InvalidDataAccessResourceUsageException: could not prepare statement; SQL [call next value for hibernate_sequence]; nested exception is org.hibernate.exception.SQLGrammarException: could not prepare statement] with root cause

org.h2.jdbc.JdbcSQLSyntaxErrorException: Sequence "HIBERNATE_SEQUENCE" not found; SQL statement:
call next value for hibernate_sequence [90036-200]
    at org.h2.message.DbException.getJdbcSQLException(DbException.java:576) ~[h2-1.4.200.jar:1.4.200]

IDENTITY:

o.h.engine.jdbc.spi.SqlExceptionHelper   : SQL Error: 23502, SQLState: 23502
o.h.engine.jdbc.spi.SqlExceptionHelper   : NULL not allowed for column "ID"; SQL statement:
insert into debug (id, dummycol) values (null, ?) [23502-200]
o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement] with root cause

org.h2.jdbc.JdbcSQLIntegrityConstraintViolationException: NULL not allowed for column "ID"; SQL statement:
insert into debug (id, dummycol) values (null, ?) [23502-200]
    at org.h2.message.DbException.getJdbcSQLException(DbException.java:459) ~[h2-1.4.200.jar:1.4.200]

TABLE:

 o.hibernate.id.enhanced.TableGenerator   : HHH000351: Could not read or init a hi value

org.h2.jdbc.JdbcSQLSyntaxErrorException: Table "HIBERNATE_SEQUENCES" not found; SQL statement:
select tbl.next_val from hibernate_sequences tbl where tbl.sequence_name=? for update [42102-200]
    at org.h2.message.DbException.getJdbcSQLException(DbException.java:453) ~[h2-1.4.200.jar:1.4.200]

基于其他问题的尝试：

strategy=GenerationType.IDENTITY 并将 hibernate.dialect=org.hibernate.dialect.H2Dialect 添加到 application.properties。发出警告：'hibernate.dialect' is an unknown property. 并且错误消息没有变化
添加 spring.jpa.hibernate.use-new-id-generator-mappings=false
IDENTITY、SEQUENCE 没有变化。 TABLE 的类似错误：

org.hibernate.orm.deprecation            : HHH90000015: Found use of deprecated [org.hibernate.id.MultipleHiLoPerTableGenerator] table-based id generator; use org.hibernate.id.enhanced.TableGenerator instead.  See Hibernate Domain Model Mapping Guide for details.
o.h.engine.jdbc.spi.SqlExceptionHelper   : SQL Error: 42102, SQLState: 42S02
o.h.engine.jdbc.spi.SqlExceptionHelper   : Table "HIBERNATE_SEQUENCES" not found; SQL statement:
select sequence_next_hi_value from hibernate_sequences where sequence_name = 'debug' for update [42102-200]

将 spring.jpa.hibernate.ddl-auto 从 none 设置为 create-drop 有效（即生成 ID，将行添加到 table）但现在 table 不再从 data.sql.

其他详细信息

application.properties:

spring.datasource.url=jdbc:h2:mem:h2db
spring.h2.console.enabled=true
spring.h2.console.path=/h2

#spring.jpa.hibernate.ddl-auto=none
spring.jpa.hibernate.ddl-auto=create-drop
spring.datasource.initialization-mode=embedded
#hibernate.dialect=org.hibernate.dialect.H2Dialect
#spring.jpa.hibernate.use-new-id-generator-mappings=false

build.gradle:

plugins {
    id 'org.springframework.boot' version '2.3.3.RELEASE'
    id 'io.spring.dependency-management' version '1.0.10.RELEASE'
    id 'java'
    id "io.freefair.lombok" version "5.2.1"
}


group = 'com.my.project'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '11'

repositories {
    mavenCentral()
}

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-web'
    implementation 'org.springframework.boot:spring-boot-starter-actuator'
    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
    runtimeOnly 'com.h2database:h2'
}

解决方案

spring.jpa.hibernate.ddl-auto=none 在 application.properties
@GeneratedValue(strategy=GenerationType.IDENTITY) 在 class 和 id BIGINT PRIMARY KEY AUTO_INCREMENT 在 schema.sql 中实现了它。

Answer 1

如果你想生成id同时使用*sql文件，你需要在创建时定义auto_increment 属性到你的id字段table.

因为当你使用生成策略 - Identity 时，hibernate 认为你的列在 table 一侧是自动递增的。

如何使用生成的索引将实体对象保存到已初始化的 h2 table 中？

How to save an Entity object into an initialized h2 table with generated index?

java

spring

hibernate

h2

spring-data-jpa

基于其他问题的尝试：

其他详细信息

解决方案