内存数据库H2中的Spring Boot在初始化时不会从文件加载数据 [英] Spring Boot in memory database H2 doesn't loads data from file on initialization

问题描述

我在应用程序初始化时将数据加载到内存数据库中时遇到问题。我创建了包含表格结构和初始数据的 schema.sql 和 data.sql 文件。

I have an issue with loading data into in-memory database on application initialization. I have created schema.sql and data.sql files containing table structure and initial data.

schema.sql：

CREATE TABLE users (
  id          INT PRIMARY KEY,
  username    VARCHAR(64) NOT NULL,
  password    VARCHAR(64) 
);

和 data.sql ：

INSERT INTO users (id, username, password) VALUES
  (1, 'usr1', 'bigSecret'),
  (2, 'usr2', 'topSecret');

我正在使用 JpaRepository 来处理数据layer：

I am using JpaRepository for working with data layer:

public interface UserRepository extends JpaRepository<User, Long> {
}

我还配置 application.properties

spring.datasource.initialize=true
spring.datasource.url=jdbc:h2:mem:testdb;DB_CLOSE_DELAY=- 1;DB_CLOSE_ON_EXIT=FALSE
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=

但是当我打电话

List<User> users = userRepository.findAll();

用户实体

@Entity
@Table(name = "users")
public class User {

  @Id
  @GeneratedValue
  private Long id;
  private String username;
  private String password;

  public User() {  }

  public Long getId() {
    return id;
  }

  public void setId(Long id) {
    this.id = id;
  }

  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getPassword() {
    return password;
  }

  public void setPassword(String password) {
    this.password = password;
  }
}

我得到空列表，但我应该得到两个前来自我的内存H2数据库的人口用户。内存数据库有什么问题？
谢谢。

I get empty list, but I should get two pre-populated users from my in-memory H2 database. What's wrong with in memory database? Thanks.

推荐答案

您可以随时尝试按h2规范运行这些脚本，您应该在其中添加INIT你的连接url中的脚本（作为选项之一）：

You can always try to run those scripts per specification of h2, where you should add an INIT script in your connection url (being one of the options):

jdbc:h2:mem:test;INIT=RUNSCRIPT FROM '~/schema.sql'\;RUNSCRIPT FROM '~/data.sql'"

此功能是通过INIT属性启用的。请注意
多个命令可以传递给INIT，但必须转义分号分隔符
，如下例所示。

This functionality is enabled via the INIT property. Note that multiple commands may be passed to INIT, but the semicolon delimiter must be escaped, as in the example below.

更新

请注意，在您的 application.properties ：

spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto=true
spring.datasource.initialize

可能会在启动过程中引起一些冲突。所以你应该始终瞄准一个或另一个，但永远不要两者同时进行。

may cause some clashing during startup. So you should always aim for one or the other, but never both at the same time.

这篇关于内存数据库H2中的Spring Boot在初始化时不会从文件加载数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！