如何使用Spring Boot将H2连接到远程数据库而不是嵌入模式?

时间:2015-09-30 20:59:57

标签: java spring-boot spring-data h2

对于我的小型Spring Boot应用程序,我在src / main / resources下有这个配置:

server.port = 8090
spring.datasource.driverClassName = org.h2.Driver
spring.datasource.url = jdbc:h2:file:~/stapler

我知道此配置已正确选取,因为应用程序启动日志中存在有效的端口号8090。还有一个@PostConstruct initDb()方法,它创建数据并将数据插入该数据库的2个表中:

package com.avk.stapler.init;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.jdbc.core.JdbcTemplate;

import javax.annotation.PostConstruct;

@SpringBootApplication
public class DbInitializer {
    @Autowired
    private JdbcTemplate jdbcTemplate;

    public static void main(String[] args) {
        SpringApplication.run(DbInitializer.class, args);
    }

    @PostConstruct
    private void initDb() {
        System.out.println("Creating table employees");
        jdbcTemplate.execute("drop table employees if exists");
        jdbcTemplate.execute("create table employees(id serial, name varchar(255), surname varchar(255))");
        jdbcTemplate.execute("insert into employees(name, surname) values('Jan', 'Kowalski')");
        jdbcTemplate.execute("insert into employees(name, surname) values('Stefan', 'Nowak')");


        System.out.println("Creating table allocations");
        jdbcTemplate.execute("drop table allocations if exists");
        jdbcTemplate.execute("create table allocations(id serial, week int, year int, shift int, employee_id bigint)");
        jdbcTemplate.execute("insert into allocations(week, year, shift, employee_id) values(29, 2015, 1, 1)");
        jdbcTemplate.execute("insert into allocations(week, year, shift, employee_id) values(28, 2015, 2, 1)");
        jdbcTemplate.execute("insert into allocations(week, year, shift, employee_id) values(29, 2015, 3, 2)");
        jdbcTemplate.execute("insert into allocations(week, year, shift, employee_id) values(28, 2015, 2, 2)");
    }
}

我可以在启动时看到这个记录,我认为没有更多关于DB的日志:

2015-09-30 22:41:22.948  INFO 2832 --- [           main] o.s.j.d.e.EmbeddedDatabaseFactory        : Creating embedded database 'testdb'
Creating table employees
Creating table allocations

由于上述原因,我想在我的主目录中看到“stapler.h2.db”文件,但实际情况并非如此。这里应该更改DB文件出现的内容?

2 个答案:

答案 0 :(得分:9)

确保您的maven依赖项如下所示:

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

如果要使用JDBC将H2用作远程数据库,则需要确保已在连接URL中的指定文件路径上运行H2数据库。

如果您尚未安装H2,可以在此处获取在服务器模式下运行H2的说明:http://www.h2database.com/html/tutorial.html#tutorial_starting_h2_console

运行后,您可以使用您提供的相同JDBC连接URL连接到它。只需使用以下应用程序属性。

spring.datasource.url=jdbc:h2:tcp://localhost/~/stapler
spring.datasource.username=sa
spring.datasource.password=

如果您希望嵌入式H2数据库创建H2文件,那也是可能的。只需使用下面的配置。

spring.datasource.url=jdbc:h2:file:~/stapler;AUTO_SERVER=true
spring.datasource.username=
spring.datasource.password=

创建的文件可能名为stapler.mv.db。要告诉H2嵌入式使用stapler.h2.db,您可以在此处了解如何执行此操作:Why is my embedded h2 program writing to a .mv.db file

(非常感谢StéphaneNic​​oll帮我回答这个问题)

答案 1 :(得分:1)

在application.properties中尝试此操作。它对我有用:

  spring.datasource.url=jdbc:h2:~/test
  spring.datasource.driverClassName=org.h2.Driver
  spring.datasource.username=sa
  spring.datasource.password=
  spring.jpa.database-platform=org.hibernate.dialect.H2Dialect