py库： pymysql、 json （mysql数据库）

数据库查询结果，用json返回：

#连接数据库
import pymysql
print(pymysql.VERSION)
conn = pymysql.Connect(host='localhost',user='root',passwd='qin',db='person',port=3306,charset='utf8')
cur = conn.cursor()
cur.execute("select * from dream")
print (cur.rowcount)

数据库查询结果，用json返回：

#数据库查询结果，用json返回
import json
import pymysql
conn = pymysql.Connect(host='localhost',user='root',passwd='python',db='zzdb',port=3306,charset='utf8')
cur = conn.cursor()
cur.execute("select * from users")
print ('共有',cur.rowcount,'条数据')

users=[]
data = {}
results = cur.fetchall()
for r in results:
    print(r[0],end=' ')
    print(r[1],end=' ')
    print(r[2],end=' ')
    print("---")
    person = {}
    person['id'] = r[0]
    person['name'] = r[1]
    person['age'] = r[2]
    users.append(person)
cur.close()
conn.close()
data['code'] = 0
data['msg'] = '成功'
data['users'] = users
jsonStr = json.dumps(data)
print(jsonStr)

输出json

#将一个list列表对象，进行了json格式的编码转换
import json
l = ['iplaypython',[1,2,3], {'name':'xiaoming'}]
encoded_json = json.dumps(l) #将列表，进行json格式化编码
print (repr(l))
print (encoded_json)

decode_json = json.loads(encoded_json)
print (type(decode_json))
print (type(encoded_json))

..