Liquibase：如何使用 CURRENT_TIMESTAMP 加载数据？

Question

我正在尝试更新我的项目，从

开始

    <liquibase.version>3.5.5</liquibase.version>
    <liquibase-hibernate5.version>3.6</liquibase-hibernate5.version>

到

    <liquibase.version>3.9.0</liquibase.version>
    <liquibase-hibernate5.version>3.8</liquibase-hibernate5.version>

我在从 CSV 文件加载数据时遇到了一些问题，这些文件包含一些以当前时间戳为值的列。

例如我的 CSV 文件：

id;name;created;modified
1;Book A;now();now()
2;Book B;now();now()

本书 table 是用以下内容创建的：

<createTable tableName="book">
    <column name="id" type="bigint" autoIncrement="${autoIncrement}">
        <constraints primaryKey="true" nullable="false"/>
    </column>
    <column name="name" type="varchar(255)">
        <constraints nullable="false"/>
    </column>
    <column name="created" type="timestamp">
        <constraints nullable="false"/>
    </column>
    <column name="modified" type="timestamp">
        <constraints nullable="false"/>
    </column>
</createTable>

数据加载为：

<property name="now" value="current_timestamp" dbms="postgresql"/>

<changeSet id="20180508144233-1" author="developer">
    <loadData catalogName="public"
              encoding="UTF-8"
              file="config/liquibase/books.csv"
              schemaName="public"
              separator=";"
              quotchar="'"
              tableName="book">
    </loadData>
</changeSet>

以前版本的 Liquibase 运行良好，但更新后出现以下错误：

2020-06-26 16:49:57 [project-Executor-1] [ERROR] liquibase.changelog.ChangeSet - Change Set config/liquibase/changelog/20180508144233_added_books_data.xml::20180508144233-1::developer failed.  Error: liquibase.exception.DateParseException: Improper value in 'NOW' value: now(). 'NOW' must be followed by + or -, then numeric offset, then units (h{our{s}}, m{inute{s}}, d{ay{s}}, or y{ears}
Hibernate: select answerweig0_.id as id1_1_, answerweig0_.likelihood as likeliho2_1_, answerweig0_.question_type as question3_1_, answerweig0_.weight as weight4_1_ from answer_weight answerweig0_
2020-06-26 16:49:57 [project-Executor-1] [ERROR] i.g.j.c.l.AsyncSpringLiquibase - Liquibase could not start correctly, your database is NOT ready: Migration failed for change set config/liquibase/changelog/20180508144233_added_books_data.xml::20180508144233-1::developer:
     Reason: liquibase.exception.UnexpectedLiquibaseException: liquibase.exception.DateParseException: Improper value in 'NOW' value: now(). 'NOW' must be followed by + or -, then numeric offset, then units (h{our{s}}, m{inute{s}}, d{ay{s}}, or y{ears}
liquibase.exception.MigrationFailedException: Migration failed for change set config/liquibase/changelog/20180508144233_added_books_data.xml::20180508144233-1::developer:
     Reason: liquibase.exception.UnexpectedLiquibaseException: liquibase.exception.DateParseException: Improper value in 'NOW' value: now(). 'NOW' must be followed by + or -, then numeric offset, then units (h{our{s}}, m{inute{s}}, d{ay{s}}, or y{ears}
    at liquibase.changelog.ChangeSet.execute(ChangeSet.java:646)
    at liquibase.changelog.visitor.UpdateVisitor.visit(UpdateVisitor.java:53)
    at liquibase.changelog.ChangeLogIterator.run(ChangeLogIterator.java:83)
    at liquibase.Liquibase.update(Liquibase.java:202)
    at liquibase.Liquibase.update(Liquibase.java:179)
    at liquibase.integration.spring.SpringLiquibase.performUpdate(SpringLiquibase.java:366)
    at liquibase.integration.spring.SpringLiquibase.afterPropertiesSet(SpringLiquibase.java:314)
    at org.springframework.boot.autoconfigure.liquibase.DataSourceClosingSpringLiquibase.afterPropertiesSet(DataSourceClosingSpringLiquibase.java:46)
    at io.github.jhipster.config.liquibase.AsyncSpringLiquibase.initDb(AsyncSpringLiquibase.java:118)
    at io.github.jhipster.config.liquibase.AsyncSpringLiquibase.lambda$afterPropertiesSet[=16=](AsyncSpringLiquibase.java:93)
    at io.github.jhipster.async.ExceptionHandlingAsyncTaskExecutor.lambda$createWrappedRunnable(ExceptionHandlingAsyncTaskExecutor.java:78)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

Answer 1

作为变通方法，我可以使用 table 创建更改日志中的默认值来设置此类列的值：

<createTable tableName="book">
    <column name="id" type="bigint" autoIncrement="${autoIncrement}">
        <constraints primaryKey="true" nullable="false"/>
    </column>
    <column name="name" type="varchar(255)">
        <constraints nullable="false"/>
    </column>
    <column name="created" type="timestamp" defaultValueComputed="CURRENT_TIMESTAMP">
        <constraints nullable="false"/>
    </column>
    <column name="modified" type="timestamp" defaultValueComputed="CURRENT_TIMESTAMP">
        <constraints nullable="false"/>
    </column>
</createTable>

并从 CSV 文件中删除相应的列：

id;name
1;Book A
2;Book B

但是，我仍在寻找将 CURRENT_TIMESTAMP 值保留在 CSV 文件中的方法。

Answer 2

您的解决方法非常正确。但是根据数据库的不同，您将必须添加一种方式，使您的 update_timestamp 或修改后的时间戳将根据您在此数据库行中的每次添加、减法或编辑而改变。例如，以下是如何在 PostgresSQL 中设置它。

<changeSet id="{UNIQUE_ID}" author="{YOUR_NAME}">
    <preConditions onFail="MARK_RAN">
        <dbms type="postgresql"/>
    </preConditions>
    <createProcedure>
        CREATE OR REPLACE FUNCTION refresh_updated_date_column()
        RETURNS TRIGGER AS $$
        BEGIN
        NEW.updated_date = now();
        RETURN NEW;
        END;
        $$ language 'plpgsql';
    </createProcedure>
    <rollback>
        DROP FUNCTION IF EXISTS refresh_updated_date_column;
    </rollback>
</changeSet>`

这将是您将在创建 table 并添加所需列的原始变更集之后添加的附加变更集。

Liquibase：如何使用 CURRENT_TIMESTAMP 加载数据？

Liquibase: how to load data with CURRENT_TIMESTAMP?

postgresql

liquibase