[英]Converting floating point (double) from Java to JRuby on Rails to SQL
I am writing a library in Java so I can use it in JRuby on Rails with a MySQL database. 我正在用Java编写一个库,因此可以在JRuby on Rails中将它与MySQL数据库一起使用。 Should I use float
or double
to represent the floating point that is eventually going to end up as the :decimal
model type in Rails ActiveRecord? 我应该使用float
还是double
来表示浮点,这些浮点最终会在Rails ActiveRecord中成为:decimal
模型类型?
More explicitly: 更明确地说:
double converts to a DOUBLE PRECISION 双精度转换为双精度
float converts to a FLOAT float转换为FLOAT
But since only :decimal
is supported in ActiveRecord , which Java primitive maps to that? 但是由于ActiveRecord仅支持 :decimal
,因此哪个Java原语映射到该:decimal
?
The equivalent in Java is the BigDecimal class. Java中的等效项是BigDecimal类。 There is no primitive for this. 没有原始的东西。
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