如何用符号 id 写请求 sql

Question

我想在 table users 中找到一个 ID 为 :

的用户

<%= @user = User.find_by_sql("SELECT users . * FROM users WHERE id = [:id] ")%>

但我有一个例外：

Mysql2::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '[:id]' at line 1: SELECT users . * FROM users WHERE id = [:id]

Answer 1

试试这个

<%= @user = User.find_by_sql("SELECT users . * FROM users WHERE id = "[:id] 
)%>

Answer 2

根据documentation：

find_by_sql(sql, binds = [])

用数组中的绑定包装查询：

=> User.find_by_sql(["select users.email from users where email = :q and first_name = :a", {q: 'foo', a: 'bar'}])