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                # MySQL的大小寫敏感性 lower_case_table_names 在執行MySQL 數據庫給數據表改名時,發現報錯,如下: ![](https://box.kancloud.cn/c68c73a769acccd2e625063bf367eb1f_1091x300.png) 從提示中可以看出 `blog_comment`,表已經存在,可登錄 MySQL 客戶端查看數據表,并沒有看到這張表。 ![](https://box.kancloud.cn/2cf0c54e537cfd4318fcf81635a66ecb_185x95.png) 提示中所說目標表并不存在。手動執行改名SQL`RENAME TABLE blog_Comment TO blog_comment;`,報同樣錯誤:`Table 'blog_comment' already exists`。 從網上找一些相關的文章,如下: [mysql運維-lower_case_table_names(大小寫敏感)](http://blog.csdn.net/jesseyoung/article/details/40617031) [mysql中lower_case_table_names參數的設置,table和DB大小寫區分 ](http://blog.chinaunix.net/uid-30041424-id-5037541.html) 根據上面查到的資料進行數據庫 `lower_case_table_names` 參數查看: ``` show variables like "%lower_case_table_names%"; +------------------------+-------+ | Variable_name | Value | +------------------------+-------+ | lower_case_table_names | 2 | +------------------------+-------+ ``` `lower_case_table_names` 設置 2,創建的表和DB依據語句上格式存放,凡是查找都是轉換為小寫進行。 于是,在 配置文件中`my.cnf` 的 `[mysqld]` 下增加行變量 `lower_case_table_names = 0` ![](https://box.kancloud.cn/6954946ac9ce1d87b8030edeb04e9ca8_369x139.png) 改完以后再次執行 `rename` 操作。 ``` An error occurred while retrieving the information for table 'blog_Comment'. Please try again. MySQL said: Table 'blog_advanced.blog_Comment' doesn't exist ``` 于是,只能打開
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