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Magento2 使用db_schema.xml添加unique字段|Magento2 create unique field using db_schema.xml
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示例：
<?xml version="1.0"?> <schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Setup/Declaration/Schema/etc/schema.xsd"> <table name="wishlist_item_option"> <column xsi:type="varchar" name="short_url" nullable="true" length="20" comment="短连接"/> <column xsi:type="varchar" name="origin_url" nullable="true" length="1000" comment="原链接"/> <constraint xsi:type="unique" referenceId="WISHLIST_ITEM_OPTION_SHORT_URL"> <column name="short_url"/> </constraint> </table> </schema>
