Mysql Rails 3 connection.execute IN语句参数数组语法
我有一个关于Rails 3 ActiveRecord::Base.connection.execute方法和参数的语法问题,我想使用它。我已经为此争论了几个小时,只是在互联网上似乎找不到这个具体问题的任何答案 数据库是MySQL 我需要通过SELECT with IN condition语句创建一个临时表,其中IN应该检查的值列表是一个参数-rails数组。代码如下所示:Mysql Rails 3 connection.execute IN语句参数数组语法,mysql,ruby-on-rails,ruby-on-rails-3,sql-parametrized-query,Mysql,Ruby On Rails,Ruby On Rails 3,Sql Parametrized Query,我有一个关于Rails 3 ActiveRecord::Base.connection.execute方法和参数的语法问题,我想使用它。我已经为此争论了几个小时,只是在互联网上似乎找不到这个具体问题的任何答案 数据库是MySQL 我需要通过SELECT with IN condition语句创建一个临时表,其中IN应该检查的值列表是一个参数-rails数组。代码如下所示: arr = [1,2,3] ActiveRecord::Base.connection.execute("CREATE TE
arr = [1,2,3]
ActiveRecord::Base.connection.execute("CREATE TEMPORARY TABLE things SELECT * FROM objects WHERE objects.id IN #{arr}")
我得到一个MySQL语法错误
ActiveRecord::Base.connection.execute("CREATE TEMPORARY TABLE things SELECT * FROM objects WHERE objects.id IN #{(arr)}")
ActiveRecord::Base.connection.execute("CREATE TEMPORARY TABLE things SELECT * FROM objects WHERE objects.id IN (#{arr})")
再次MySQL语法错误
ActiveRecord::Base.connection.execute("CREATE TEMPORARY TABLE things SELECT * FROM objects WHERE objects.id IN #{(arr)}")
ActiveRecord::Base.connection.execute("CREATE TEMPORARY TABLE things SELECT * FROM objects WHERE objects.id IN (#{arr})")
MySQL语法错误
上述尝试对应于此问题的答案:
我甚至尝试以类似于find_by_sql的方式使用,但仍然得到一个错误:
ActiveRecord::Base.connection.execute(["CREATE TEMPORARY TABLE things SELECT * FROM objects WHERE objects.id IN (:ids)",{:ids => arr }]) - obviously, I get an MySQL error.
我错过了什么明显的东西吗?请帮忙!我正是以这种方式需要它(例如,创建具有这种条件的临时表),否则基于此条件的更复杂查询将无法工作。谢谢 如果将
arr.to_s
转换为“[1,2,3]”
我认为arr.join(',')
应该可以工作
ActiveRecord::Base.connection.execute("CREATE TEMPORARY TABLE things SELECT * FROM objects WHERE objects.id IN (#{arr.join(', ')})")
下面是另一个使用Rails查询清理的选项
arr = [1,2,3]
query = "SELECT * FROM objects where id IN (?)"
query = ActiveRecord::Base.send :sanitize_sql_array, [query, arr]
ActiveRecord::Base.connection.execute(query)