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                ## @Sql 使用@Sql注解可以提供一個Sql語句 ```java @Sql("select * from sys_user where id = ?") @Select UserEntity queryUserById(Integer id); ``` 當調用queryUserById的時候,會從@Sql上獲得執行的sql,會從方法參數中按順序獲得sql的參數,底層會有如下類似調用 ```java List list = sqlManager.execute(new SQLReady(sql,new Object[]{id}),UserEntity.class); return list.get(0); ``` @Select注解標識這是一個查詢操作,另外一個是@Update,和@BatchUpdate注解,標識更新操作和批量跟新,如果@Sql沒有使用@Select和@Update,則默認是查詢操作 如下執行更新操作 ```java @Sql("update sys_user set name=? where id = ?") @Update int updateName(String name,Integer id); ``` 當調用updateName方法的時候,相當于底層會有如下類似調用 ```java return sqlManager.executeUpdate(new SQLReady(sql,new Object[]{name,id}) ``` > @Sql注解的實現org.beetl.sql.mapper.ready包下。
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