mysqlクエリがnullの値にデフォルト値を割り当てる
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select u.User_pictureUrl,u.User_phone,u.ID as userId,u.user_nickname,IFNULL(f.userFriend_status,3)as status ,IFNULL(f.userFriend_comment,' ')as userFriend_comment,IFNULL(f.userFriend_address,' ')as userFriend_address
from tab_userinfo u LEFT JOIN tab_userfriend f ON u.ID=f.userFriend_user_id where u.ID=#{userId}