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                # 5.1.20\. 字段和規則元素(column and formula elements) 任何接受`column`屬性的映射元素都可以選擇接受`&lt;column&gt;` 子元素。同樣的,`formula`子元素也可以替換`&lt;formula&gt;`屬性。 ``` <column name="column_name" length="N" precision="N" scale="N" not-null="true|false" unique="true|false" unique-key="multicolumn_unique_key_name" index="index_name" sql-type="sql_type_name" check="SQL expression" default="SQL expression"/> ``` ``` <formula>SQL expression</formula> ``` `column` 和 `formula` 屬性甚至可以在同一個屬性或關聯映射中被合并來表達,例如,一些奇異的連接條件。 ``` <many-to-one name="homeAddress" class="Address" insert="false" update="false"> <column name="person_id" not-null="true" length="10"/> <formula>'MAILING'</formula> </many-to-one> ```
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