postgresql - 双引号在更新查询中给出问题

Question

查询'-'无法执行。请帮忙。

    update table_attributes set foreign_table=
    '(select users_roles.*, concat(persons.firstname,'-',roles.r_name) as name from users_roles users_roles left join users users on users_roles.user_id = users.user_id 
    LEFT JOIN persons on persons.user_id=users.user_id 
    left join roles roles on users_roles.role_id = roles.role_id as users_roles ' where att_id=24

Answer 1

使用Dollar-Quoted String语法 - 它非常安全且易读 - 并且不要忘记之前的右括号as users_roles。

update table_attributes set foreign_table =
$FT_SQL$(
 select users_roles.*, concat(persons.firstname,'-',roles.r_name) as "name" 
   from users_roles users_roles 
   left join users users on users_roles.user_id = users.user_id 
   left join persons on persons.user_id=users.user_id 
   left join roles roles on users_roles.role_id = roles.role_id
) as users_roles;$FT_SQL$
where att_id=24;

请注意，有些别名是多余的。