第三步：用合适的分离标记替换rawdata . xml中的主键以及外键值。

Step 3: Replace the primary and foreign key values in rawdata.xml with appropriately abstracted tokens.

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ON DELETE CASCADE — 当一条记录从父表中删除时，子表中的所有记录以及匹配的外键值都全部被删除。

ON DELETE CASCADE—When a record is deleted from the parent table, all records in the child table with matching foreign key values are also deleted.

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当ON DELETE CASCADE规则被激活时，当一条记录从父表中删除时，子表中的所有记录以及匹配的外键值都被删除。

When an ON delete CASCADE rule is active, all records in the child table with matching foreign key values are deleted when a record is deleted from the parent table.

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