在传递给数据库之前手动引用值

Question

在WHERE条款涉及时，一切都很清楚：

puts $DB[:users].where('field = ?', "'").sql   # SELECT * FROM `users` WHERE (field = '\'')
puts $DB[:users].where(field: "'").sql   # SELECT * FROM `users` WHERE (`field` = '\'')

但是ORDER BY呢？

puts $DB[:users].order_by(
    ("field = '%s'" % "'").lit
).sql   # SELECT * FROM `users` ORDER BY field = '''

Answer 1

您可以quote清理字符串：

puts $DB[:users].order_by(
    ("field = %s" % ActiveRecord::Base.connection.quote("'")).lit
).sql    # SELECT * FROM `users` ORDER BY field = ''''

对于sequel，您应该使用literal_append：

puts $DB[:users].order_by(
    ($DB[:users].literal_append("field = ", "'")).lit
).sql    # SELECT * FROM `users` ORDER BY field = ''''