DAO not only has the capability of accessing database, but also can operate and define the database, for example, setting up database, table, field and index.
DAO不仅具有对数据库访问的能力，而且能对数据库进行操作和定义，如创建数据库、创建表、创建域和创建索引。
DAO not only has the capability of accessing database, but also can operate and define the database, for example, setting up database, table, field and index.
DAO不仅具有对数据库访问的能力，而且能对数据库进行操作和定义，如创建数据库、创建表、创建域和创建索引。
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