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Question

查询=

SELECT * FROM options WHERE 'key' = 'exchange_rate' 

表结构中返回=

key varchar(500) latin1_swedish_ci 
value text latin1_swedish_ci 

表内容

Key   | Value 
exchange_rate | 25 

方案

phpMyAdmin 4.0.4 Mysql 

结果

0 Rows returned 

你知道问题在这里吗？

Answer 1

尝试此查询：代替

SELECT * FROM options WHERE `key` = 'exchange_rate' 

：

SELECT * FROM options WHERE 'key' = 'exchange_rate' 

Answer 2

Qoutes用于显示VARCHAR值不列名

SELECT * FROM options WHERE `key` = 'exchange_rate'