activejdbc 迁移器强制创建 `schema_version` table 如果它退出

Question

今天我将通过从一台服务器转储演示数据并恢复到另一台服务器来设置另一个开发环境。我还将代码库复制到开发服务器。当我运行 mvn validate 将调用迁移时，它输出

[INFO] Scanning for projects...
[INFO]
[INFO] ----------------------< com.ft:xjobs-server >-----------------------
[INFO] Building API server for xJobs service 0.2-SNAPSHOT
[INFO] --------------------------------[ war ]---------------------------------
[INFO]
[INFO] --- db-migrator-maven-plugin:2.5-j8:migrate (dev_migrations) @ xjobs-server ---
[INFO] Sourcing database configuration from file: /srv/apps/xjobs-server/src/main/resources/database.properties
[INFO] Environment: development
[INFO] Migrating jdbc:postgresql://localhost:5432/xjobs_deve using migrations at /srv/apps/xjobs-server/src/migrations/
[INFO] Creating schema version table for POSTGRESQL DB
[INFO] Executing: create table schema_version (version varchar(32) not null unique, applied_on timestamp not null, duration int not null)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  0.864 s
[INFO] Finished at: 2021-07-26T00:42:50+08:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.javalite:db-migrator-maven-plugin:2.5-j8:migrate (dev_migrations) on project xjobs-server: Execution dev_migrations of goal org.javalite:db-migrator-maven-plugin:2.5-j8:migrate failed: org.javalite.activejdbc.DBException: org.postgresql.util.PSQLException: ERROR: relation "schema_version" already exists, query: create table schema_version (version varchar(32) not null unique, applied_on timestamp not null, duration int not null) -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException

和 javalite 版本

<javalite.version>2.5-j8</javalite.version>

我检查过schema_version table，它确实存在，并且包含所有迁移序列号。我不明白为什么迁移器仍然需要再次创建 table。

-- 更新

pom.xml

中的一些配置

    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <javalite.version>2.5-j8</javalite.version>
        <jetty.version>9.4.24.v20191120</jetty.version>
        <environments>development</environments>
    </properties>
    ...
    <plugin>
        <groupId>org.javalite</groupId>
        <artifactId>db-migrator-maven-plugin</artifactId>
        <version>${javalite.version}</version>
        <dependencies>
        <dependency>
                    <groupId>org.postgresql</groupId>
                    <artifactId>postgresql</artifactId>
                    <version>42.2.18</version>
                </dependency>
        </dependencies>
        <configuration>
            <configFile>${project.basedir}/src/main/resources/database.properties</configFile>
            <environments>${environments}</environments>
        </configuration>
        <executions>
            <execution>
                <id>dev_migrations</id>
                <phase>validate</phase>
                <goals>
                    <goal>migrate</goal>
                </goals>
            </execution>
        </executions>
    </plugin>

Answer 1

我创建了一个示例来准确测试您的场景。幸运的是，JavaLite Migrator 正在按预期工作。

这是示例的 link：https://github.com/javalite/javalite-examples/tree/master/postgresql-example

无论您运行迁移器多少次，它每次都按预期运行：

[INFO] --- db-migrator-maven-plugin:2.5-j8:migrate (dev_migrations) @ postgresql-example ---
[INFO] Sourcing database configuration from file: /home/igor/projects/javalite/javalite-examples/postgresql-example/src/main/resources/database.properties
[INFO] Environment: development.test
[INFO] Migrating jdbc:postgresql://localhost/postgres using migrations at /home/igor/projects/javalite/javalite-examples/postgresql-example/src/migrations/
[INFO] Trying migrations at: /home/igor/projects/javalite/javalite-examples/postgresql-example/src/migrations 
[INFO] No new migrations are found
[INFO] Environment: development
[INFO] Migrating jdbc:postgresql://localhost/postgres using migrations at /home/igor/projects/javalite/javalite-examples/postgresql-example/src/migrations/
[INFO] Trying migrations at: /home/igor/projects/javalite/javalite-examples/postgresql-example/src/migrations 
[INFO] No new migrations are found
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  0.460 s
[INFO] Finished at: 2021-07-26T12:39:06-05:00

那么，您为什么遇到问题？您可能在数据库中有多个模式，并且可见性配置不当，因此在一种情况下，您会看到 schema_version table，而在另一种情况下，您却看不到。 Oracle 之前曾报告过类似案例，修复与消除不同用户下的泄漏 table 可见性有关。这是您需要重点解决问题的地方。

activejdbc 迁移器强制创建 `schema_version` table 如果它退出

activejdbc migrator force to create `schema_version` table if it exits

activejdbc

javalite