Trace:
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
|
jvx:reference [2020/06/15 09:03] cduncan [MetaData] |
jvx:reference [2020/06/15 09:08] cduncan [No Primitives, Objects Only] |
||
|---|---|---|---|
| Line 667: | Line 667: | ||
| ===== Usage Example ===== | ===== Usage Example ===== | ||
| - | Here is a simple example of a ''%%MemDataBook%%'', an ''%%IDataBook%%'' implementation which only operates in memory: | + | Here is a simple example of a ''%%MemDataBook%%'', an ''%%IDataBook%%'' implementation that only operates in memory: |
| <code java> | <code java> | ||
| Line 716: | Line 716: | ||
| * Binary Data | * Binary Data | ||
| - | Text and binary data are both objects (arrays of primitives are objects after all) and numbers are either primitives or objects. Most of the time, if we deal with numbers inside a database, we want them to be of arbitrary precision, which means we must represent them as ''%%BigDecimal%%''. Supporting ''%%double%%'' or ''%%float%%'' in these cases would be dangerous because one might write a ''%%float%%'' into the database [[https://en.wikipedia.org/wiki/Floating-point_arithmetic|which might or might not end up with the correct value]] in the database. To completely eliminate such problems, we only support objects, which means that one is “limited” to the usage of number extensions like ''%%BigLong%%'' and ''%%BigDecimal%%'', which do not suffer from such problems. | + | Text and binary data are both objects (arrays of primitives are objects after all) and numbers are either primitives or objects. Most of the time, if we deal with numbers inside a database, we want them to be of arbitrary precision, which means we must represent them as ''%%BigDecimal%%''. Supporting ''%%double%%'' or ''%%float%%'' in these cases would be dangerous because one might write a ''%%float%%'' into the database [[https://en.wikipedia.org/wiki/Floating-point_arithmetic|, which might or might not end up with the correct value]] in the database. To completely eliminate such problems, we only support objects, which means that one is “limited” to the usage of number extensions like ''%%BigLong%%'' and ''%%BigDecimal%%'', which do not suffer from such problems. |
| ==== Where Are the Data Pages? ==== | ==== Where Are the Data Pages? ==== | ||