Liquibase和JPA注释的实体

Question

我正在尝试将Liquibase与JPA批注一起使用，但是我似乎没有用。

我的项目中有一个干净的数据库，没有表，并且只有一个JPA实体。当我运行liquibase diff时，它声称DB是最新的-但事实并非如此。

Liquibase插件的Maven配置：

  <plugins>
        <plugin>
            <groupId>org.liquibase</groupId>
            <artifactId>liquibase-maven-plugin</artifactId>
            <version>3.3.1</version>
            <configuration>
                <changeLogFile>src/main/resources/liquibase/changelog.xml</changeLogFile>
                <referenceUrl>hibernate:spring:com.mycompany.entity?dialect=org.hibernate.dialect.PostgreSQLDialect</referenceUrl>
                <driver>org.postgresql.Driver</driver>
                <url>jdbc:postgresql://localhost:5432/liqubase-test</url>
                <username>postgres</username>
                <password>postgres</password>
            </configuration>
            <executions>
                <execution>
                    <phase>process-resources</phase>
                    <goals>
                        <goal>update</goal>
                    </goals>
                </execution>
            </executions>
            <dependencies>

                <dependency>
                    <groupId>org.liquibase.ext</groupId>
                    <artifactId>liquibase-hibernate4</artifactId>
                    <version>3.4</version>
                </dependency>

                <dependency>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-beans</artifactId>
                    <version>4.1.4.RELEASE</version>
                </dependency>

            </dependencies>
        </plugin>
    </plugins>

changelog.xml文件：

<?xml version="1.0" encoding="UTF-8"?>

<databaseChangeLog
        xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
         http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.0.xsd">



</databaseChangeLog>

当我运行generateChangeLog任务时：

[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building liqubase-sample 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- liquibase-maven-plugin:3.3.1:generateChangeLog (default-cli) @ liqubase-sample ---
[INFO] ------------------------------------------------------------------------
[INFO] Executing on Database: jdbc:postgresql://localhost:5432/liqubase-test
[INFO] Generating Change Log from database postgres @ jdbc:postgresql://localhost:5432/liqubase-test (Default Schema: public)
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog" xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.3.xsd http://www.liquibase.org/xml/ns/dbchangelog-ext http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd"/>
[INFO] Output written to Change Log file, null
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.213 s
[INFO] Finished at: 2015-01-10T14:47:24+01:00
[INFO] Final Memory: 9M/216M
[INFO] ------------------------------------------------------------------------

Answer 1

Liquibase正在将目标数据库模式与您指定的更改日志正确进行比较。...为空:-)

您需要做一些额外的工作。以下文章似乎在概述Hibernate的liquibase工作流程方面做得很好：

• http://www.operatornew.com/2012/11/automatic-db-migration-for-java-web.html

它看起来过于复杂，但是liquibase所做的是捕获对模式的所有更改。简而言之，您需要使数据库进入最新捕获状态，生成增量，然后将此增量添加到源代码中。

我希望这有帮助。