從Liquibase Java API訪問佔位符

Question

我正在使用Liquibase java API從databaseChangeLog文件更新我的數據庫。我使用下面的代碼還設置默認數據庫模式：

Database database = DatabaseFactory.getInstance().findCorrectDatabaseImplementation(new JdbcConnection(conn)); 
     database.setDefaultSchemaName(CustomerPortalServiceBeanFactory.getInstance().getServiceConfigurationData().getSchemaName()); 

能正常工作，除非我有一個創建一個視圖更改日誌，如下圖所示：

<?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-3.1.xsd"> 
    <changeSet author="mhills" id="customerUser-view"> 
     <createView 
       replaceIfExists="true" 
       viewName="CUSTOMER_USER_VW"> 
       select 
       customeruser.id, 
       customeruser.status, 
       customeruser.customer_id, 
       customeruser.contact_id, 
       customeruser.email_address, 
       customeruser.online_name, 
       customeruser.date_created 
       FROM customer_user customeruser 
     </createView> 
    </changeSet> 
</databaseChangeLog> 

的SCHEMANAME正確前綴視圖名稱，但我也需要在from子句中使用的表格的前綴。模式名稱是否可用作佔位符，或者有其他方法可以完成此任務嗎？

Answer 1

閱讀文檔後，我可以通過添加下面的代碼來訪問set「schemaName」。

// set the schema read from the properties file. 
System.setProperty("schemaName", CustomerPortalServiceBeanFactory.getInstance().getServiceConfigurationData().getSchemaName()); 

// Establish the Liquibase database connection 
Database database = DatabaseFactory.getInstance().findCorrectDatabaseImplementation(new JdbcConnection(conn)); 
       database.setDefaultSchemaName(CustomerPortalServiceBeanFactory.getInstance().getServiceConfigurationData().getSchemaName()); 

通過將「schemaName」值添加爲系統屬性，它可用作變更集中的佔位符。下面的例子。

<?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-3.1.xsd"> 
    <changeSet author="mhills" id="customerUser-view"> 
     <createView 
       replaceIfExists="true" 
       viewName="CUSTOMER_USER_VW"> 
       select 
       customeruser.id, 
       customeruser.status, 
       customeruser.customer_id, 
       customeruser.contact_id, 
       customeruser.email_address, 
       customeruser.online_name, 
       customeruser.date_created 
       FROM "${schemaName}".customer_user customeruser 
     </createView> 
    </changeSet> 
</databaseChangeLog>