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                ### 表操作 - CreateTables() 創建表使用`engine.CreateTables()`,參數為一個或多個空的對應Struct的指針。同時可用的方法有Charset()和StoreEngine(),如果對應的數據庫支持,這兩個方法可以在創建表時指定表的字符編碼和使用的引擎。Charset()和StoreEngine()當前僅支持Mysql數據庫。 - IsTableEmpty() 判斷表是否為空,參數和CreateTables相同 - IsTableExist() 判斷表是否存在 - DropTables() 刪除表使用`engine.DropTables()`,參數為一個或多個空的對應Struct的指針或者表的名字。如果為string傳入,則只刪除對應的表,如果傳入的為Struct,則刪除表的同時還會刪除對應的索引。
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