[英]Rails MySQL Temporary Table Error
考虑到以下定义的操作,我试图在rails中构建一个临时表:
def testCreate
insert = 'CREATE TEMPORARY TABLE test (
location varchar(10)
);
CREATE TEMPORARY TABLE test2 (
campaign varchar(10)
);
INSERT INTO test
VALUES' + params[:insert_location_csv].to_s + ';
INSERT INTO test2
VALUES(' + params[:campaign_id].to_s + ');
INSERT INTO campaign_locations(campaign_id, location_id, created_at, updated_at)
select
a.campaign as campaign_id
,b.location as location_id
,NOW() as created_at
,NOW() as updated_at
from test2 a
cross join test b'
ActiveRecord::Base.connection.execute(insert)
end
在MySQL工作台中,查询执行正常,但尝试通过以下路径访问此操作: http://localhost:3000/testCreate/70/(101),(102)
,错误显示如下:
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 'CREATE TEMPORARY TABLE test2 ( campaign varchar(10) ); INSERT' at line 5: CREATE TEMPORARY TABLE test ( location varchar(10) ); CREATE TEMPORARY TABLE test2 ( campaign varchar(10) ); INSERT INTO test VALUES(101),(102); INSERT INTO test2 VALUES(70); INSERT INTO campaign_locations(campaign_id, location_id, created_at, updated_at) select a.campaign as campaign_id ,b.location as location_id ,NOW() as created_at ,NOW() as updated_at from test2 a cross join test b
如何防止发生此错误?
传递一个有效的sql查询ActiveRecord::Base.connection.execute
方法。 您正在传递一组sql查询,并希望它可以在一个调用中工作。
以下应该工作:
create_tmp_table = 'CREATE TEMPORARY TABLE test (
location varchar(10)
);
ActiveRecord::Base.connection.execute(create_tmp_table)
文档: http : //api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/DatabaseStatements.html#method-i-execute
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