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Values retrieved from the database are always converted to PHP's Maps and converts 8-byte integer values.
Unsigned integer values have a range of 0 to 18446744073709551615 while signed integer values have a range of −9223372036854775808 to 9223372036854775807.
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Besides abstraction of SQL one needs a translation between database and PHP data-types to implement database independent applications.
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Values retrieved from the database are always converted to PHP's For compatibility reasons this type is not converted to a double as PHP can only preserve the precision to a certain degree.
Otherwise it approximates precision which can lead to false assumptions in applications.
Doctrine 2 has a type translation system baked in that supports the conversion from and to PHP values from any database platform, as well as platform independent SQL generation for any Doctrine Type.
Using the ORM you generally don't need to know about the Type system.