Question

是否可以自定义从mysql数据库返回的字符串？我有一个图像名称字段，我想加入我的目录路径。

SELECT * FROM brand
//row return.
id    image_name
1    image1.jpg

//i would like to have my return like
id    image_name
1    upload/image1.jpg

Answer 1

您正在寻找的是串联。有关MySQL concat的信息，请参阅this。

基本上，你可以做到

SELECT CONCAT('/path/to/dir/', filename) as `file_name`
FROM brand

将返回/ path / to / dir / filename

Answer 2

尝试此查询：

SELECT id,
       CONCAT('upload/', image_name) AS `file_name`
FROM   band

Answer 3

使用concat（）函数可以根据需要自定义字符串。

select id, concat('upload', image_name) from tbl;