使用Liquibase实现的多租户架构

Question

我目前遇到以下问题：我有一个Java EE应用程序，想使用Liquibase作为数据库迁移工具。问题是我有多租户模型，每个租户都有自己的模式。目前我正在使用生产者启动更新，但不确定如何配置它以与不同的模式一起使用。

我发现Spring有一些解决方案（请参阅MultiTenantSpringLiquibase了解更多详细信息）。但是，对于Java EE没有解决方案。也许唯一的解决方案是编写自定义Liquibase servlet监听器。

感谢任何帮助和最好的问候，Erno

- Errno

Answer 1

如果每个租户都有不同的模式名称，则可以使用Maven liquibase插件。您可能希望为每个模式声明不同的执行方式，如下所示：

        <build>
            <plugins>
                <plugin>
                    <!--NOTE: clearCheckSums=true attribute will make the changesets run only once.
                        The runOnChange attribute added to changesets will not work as originally intended.-->
                    <groupId>org.liquibase</groupId>
                    <artifactId>liquibase-maven-plugin</artifactId>
                    <version>${database.liquibase.version}</version>
                    <executions>
                        <execution>
                            <id>admin-schema-database-update</id>
                            <phase>process-resources</phase>
                            <configuration>
                                <changeLogFile>admin-schema.db.changelog-master.xml</changeLogFile>
                                <driver>${database.driver}</driver>
                                <contexts>${database.liquibasecontext}</contexts>
                                <url>${database.server.url}</url>
                                <username>${database.adminschema.username}</username>
                                <password>${database.adminschema.password}</password>
                                <promptOnNonLocalDatabase>false</promptOnNonLocalDatabase>
                                <outputDefaultSchema>true</outputDefaultSchema>
                                <verbose>true</verbose>
                                <logging>${database.liquibase.logging}</logging>
                                <propertyFileWillOverride>false</propertyFileWillOverride>
                            </configuration>
                            <goals>
                                <goal>update</goal>
                            </goals>
                        </execution>
                        <execution>
                            <id>user-schema-database-update</id>
                            <phase>process-resources</phase>
                            <configuration>
                                <changeLogFile>user-schema.db.changelog-master.xml</changeLogFile>
                                <driver>${database.driver}</driver>
                                <contexts>${database.liquibasecontext}</contexts>
                                <url>${database.server.url}</url>
                                <username>${database.username}</username>
                                <password>${database.password}</password>
                                <promptOnNonLocalDatabase>false</promptOnNonLocalDatabase>
                                <outputDefaultSchema>true</outputDefaultSchema>
                                <verbose>true</verbose>
                                <logging>${database.liquibase.logging}</logging>
                                <propertyFileWillOverride>false</propertyFileWillOverride>
                            </configuration>
                            <goals>
                                <goal>update</goal>
                            </goals>
                        </execution>
                    </executions>
                    <dependencies>
                        <dependency>
                            <groupId>org.liquibase.ext</groupId>
                            <artifactId>liquibase-mssql</artifactId>
                            <version>1.3.0</version>
                        </dependency>                           
                        <dependency>
                            <groupId>org.liquibase.ext</groupId>
                            <artifactId>liquibase-oracle</artifactId>
                            <version>3.1</version>
                        </dependency>                           
                    </dependencies>
                </plugin>
            </plugins>

            <resources>
                <resource>
                    <directory>src/main/resources</directory>
                    <filtering>true</filtering>
                    <includes>
                        <include>**/*.xml</include>
                        <include>**/*.csv</include>
                        <include>**/*.sql</include>
                    </includes>
                </resource>
                <resource>
                    <directory>src/main/resources</directory>
                    <filtering>false</filtering>
                    <excludes>
                        <exclude>**/*.xml</exclude>
                        <exclude>**/*.csv</exclude>
                        <exclude>**/*.sql</exclude>
                    </excludes>
                </resource>
            </resources>            
        </build>

您可以始终使用Maven的参数化构建，添加默认值如下：

<properties>   
    <liquibase.clearCheckSums>true</liquibase.clearCheckSums>   
    <database.username>userSchema</database.username>   
    <database.password>myUserPassword</database.password>   
    <database.adminschema.username>adminSchema</database.adminschema.username> 
    <database.adminschema.password>myAdminPassword</database.adminschema.password> 
    <database.liquibasecontext>!IntegrationTesting</database.liquibasecontext> 
</properties>

希望这能对你有所帮助。

- Vullnet Prekazi