Mysql Concat正在显示字节数组

Question

我是mysql的新手。我有代码，但它显示字节数组为什么？ 抱歉我的英文:(

SELECT p.city_id,p.name city, CONCAT("[", 
GROUP_CONCAT(CONCAT('{id:"', a.id, '", address:"', a.address, '"}')), 
"]") As sahalar 
FROM cities AS p LEFT JOIN carpet_fields As a ON(p.city_id = a.city_id) 
GROUP BY p.city_id, p.name ORDER BY p.city_id

它必须显示json数据但是。结果是

错误的结果

 city_id  name   sahalar
1        ADANA  0x5B7B69643A223236222C20616464726573733A2248757A75

正确的结果

city_id name sahalar 
1       ADANA [{id:"1A", address:"Huzurevleri Mah.77232 Sk. ADANA / ÇUKUROVA"},{id:"1B", address:"KARSLILAR MAH. 82008. SOK. / MAHFESIGMAZ"}]

Answer 1

我找到了解决方案

SET SESSION group_concat_max_len = 1000000; 
SELECT p.city_id,p.name city, 
CONCAT("[", 
GROUP_CONCAT( CONCAT('{id:"', CAST(a.id as char(10)), '", address:"', a.address, '"}') ), 
"]") As sahalar 
FROM cities AS p 
LEFT JOIN carpet_fields As a ON(p.city_id = a.city_id)  
GROUP BY p.city_id, p.name ORDER BY p.city_id