您可以通过使用根据当前DBMS定义的属性来做到这一点.

You can do this by using properties that are defined depending on the current DBMS.

<property name="uuid_type" value="uuid" dbms="postgresql"/>
<property name="uuid_type" value="uniqueidentifier" dbms="mssql"/>
<property name="uuid_type" value="RAW(16)" dbms="oracle"/>

<property name="uuid_function" value="uid.uuid_generate_v4()" dbms="postgresql"/>
<property name="uuid_function" value="NEWID()" dbms="mssql"/>
<property name="uuid_function" value="sys_guid()" dbms="oracle"/>

然后在定义表时使用这些属性:

Then use those properties when defining the table:

<column name="id" type="${uuid_type}" defaultValueComputed="${uuid_function}">
    <constraints nullable="false" unique="true" />
</column>

请注意，您需要使用 defaultValueComputed ，不 value

Note that you need to use defaultValueComputed, not value

如果该列是使用默认值定义的，则将其保留在插入语句中，然后数据库将在插入时生成UUID.

If the column is defined with a default value, just leave it out in your insert statements and the database will then generate the UUID when inserting.