How to start HSQLDB in server mode from Spring boot application

问题

I have a Spring boot application, running with jpa data and hsqldb 2.3.3 (in Centos 7), the application runs fine but I would like to use HSQLDB database manager to check the data status, however it failed:

application.properties:

spring.datasource.url=jdbc:hsqldb:mem:testdb
spring.datasource.username=sa
spring.datasource.password=

spring.jpa.database-platform=org.hibernate.dialect.HSQLDialect
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=create

Command to start HSQLDB:

java -cp /home/mycentos/.m2/repository/org/hsqldb/hsqldb/2.3.3/hsqldb-2.3.3.jar org.hsqldb.util.DatabaseManagerSwing

If I tried to log in with HSQLDB server mode, it pops Connection refused error

jdbc:hsqldb:hsql://localhost/testdb

If I tried to log in in-memory db, I can log in but no table and data showing up

jdbc:hsqldb:hsql:testdb

Question:

How to make it works?
Do I have to refer to the hsqldb.jar from tomcat deployment folder because that is the one using by the application?
Any configuration difference to configure hsqldb in server mode or in-memory mode from Spring application?
Can any method make in-memory mode working in such situation (to check data by db created Spring boot)?

回答1:

To access the HSQL DB created by Spring boot app, you have to start HSQL server. For example, create a XML configuration file hsql_cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="hqlServer" class="org.hsqldb.server.Server" init-method="start" destroy-method="stop">
    <property name="properties"><bean class="org.hsqldb.persist.HsqlProperties">
        <constructor-arg><props>
        <prop key="server.database.0">mem:testdb</prop>
        <prop key="server.dbname.0">testdb</prop><!--DB name for network connection-->
        <prop key="server.no_system_exit">true</prop>
        <prop key="server.port">9001</prop><!--default port is 9001 -->
        </props></constructor-arg>
    </bean></property>
</bean>
</beans>

Here is a example to import the XML configuration in main application class.

@SpringBootApplication
@ImportResource(value="classpath:/package/hsql_cfg.xml")
public class MyApplication {
}

The HSQL server will start with Spring boot app. Other applications could connect to the HSQL server using JDBC url

jdbc:hsqldb:hsql://ip_address:port/testdb

Of course, hsqldb.jar is required for loading JDBC driver class.

回答2:

Just to add to beckyang's answer, here is my approach.

Includes a hack to redirect logs to slf4j.

Includes specifying a corresponding datasource.


    import org.hsqldb.jdbc.JDBCDataSource;
    import org.hsqldb.server.Server;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.boot.context.properties.ConfigurationProperties;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.Primary;

    import javax.sql.DataSource;
    import java.io.ByteArrayOutputStream;
    import java.io.PrintWriter;

    @Configuration
    public class DataSourceConfiguration {

        private final Logger log = LoggerFactory.getLogger(getClass());

        @Bean(initMethod = "start", destroyMethod = "stop")
        @ConfigurationProperties//(prefix = "alarms.idempotent.server")
        public Server idempotentServer(@Value("${alarms.idempotent.server.path}") String path, @Value("${alarms.idempotent.port}") int port, @Value("${alarms.idempotent.name}") String name) {

            Server server = new Server();
            server.setDatabaseName(0, name);
            server.setDatabasePath(0, path);
            server.setPort(port);
            server.setLogWriter(slf4jPrintWriter());
            server.setErrWriter(slf4jPrintWriter());

            return server;

        }

        @Bean("idempotentDataSource")
        @Primary
        @ConfigurationProperties
        public DataSource idempotentDataSource(@Value("${alarms.idempotent.datasource.url}") String urlNoPath, @Value("${alarms.idempotent.name}") String name) {
            JDBCDataSource jdbcDataSource = new JDBCDataSource();
            String url = urlNoPath;
            if (!url.endsWith("/")) {
                url += "/";
            }
            url += name;
            jdbcDataSource.setUrl(url);
            jdbcDataSource.setUser("sa");
            return jdbcDataSource;
        }

        private PrintWriter slf4jPrintWriter() {
            PrintWriter printWriter = new PrintWriter(new ByteArrayOutputStream()) {
                @Override
                public void println(final String x) {
                    log.debug(x);
                }
            };
            return printWriter;
        }

    }

来源：https://stackoverflow.com/questions/40114231/how-to-start-hsqldb-in-server-mode-from-spring-boot-application

标签

Spring

jdbc

hsqldb