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Difference between revisions of "EDT:EGL Language Primitive Types"
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Revision as of 12:50, 18 July 2011
Please see the parent of this page, EDT:EGL Language.
Primitive Types (Table 3)
| Primitive Types | Value or Reference? | Core | JavaScript Nullable Types |
Java | Debug |
| Any | reference | |
|
done |
done |
| Boolean | value8 | |
done |
done |
done |
| Dictionary | reference | |
Dictionary Support |
Dictionary Support | |
| String(N) | reference | |
|
Limited string support |
|
| String | reference | |
done |
done |
done |
| Timestamp(pattern)1 | value8 | |
|
Timestamp with pattern support |
|
| Timestamp1,6 | reference | |
|
Timestamp without pattern support |
|
| Blob | reference | |
N/S |
Blob support |
|
| Clob | reference | |
N/S |
Clob support |
|
| Smallint | value8 | |
done |
done |
done |
| Int | value8 | |
done |
done |
done |
| Bigint | value8 | |
done |
done |
done |
| Decimal(N,M)7 | value8 | |
done |
done |
done |
| Decimal2 | reference | |
done |
done |
done |
| Float | value8 | |
done |
done |
done |
| Smallfloat | value8 | |
done |
done |
done |
| Number3 | reference | |
done |
Generic number support |
|
| Bytes(N)4 | value8 | |
|
Bytes with length support |
|
| Bytes5 | reference | |
|
Bytes without length support |
|
| Arraydictionary |
|
N/S | N/S | N/S | |
| Char |
|
N/S | N/S | N/S | |
| Dbchar |
|
N/S | N/S | N/S | |
| Mbchar |
|
N/S | N/S | N/S | |
| Unicode |
|
N/S | N/S | N/S | |
| Hex4 |
|
N/S | N/S | N/S | |
| Date1 |
|
N/S | N/S | N/S | |
| Time1 |
|
N/S | N/S | N/S | |
| Interval1 |
|
N/S | N/S | N/S | |
| Bin |
|
N/S | N/S | N/S | |
| Num |
|
N/S | N/S | N/S | |
| Numc |
|
N/S | N/S | N/S | |
| Pacf |
|
N/S | N/S | N/S | |
| Money |
|
N/S | N/S | N/S |
Notes on Table 3
- Timestamp is the only supported date/time type. Use it in place of RBD's date, time, and interval.
- Decimal with no length or decimals is a reference type with an immutable value.
- Number is a reference type with an immutable value. Unlike in RBD, number variables can be declared anywhere a variable declaration is allowed.
- Bytes(N) is a value type similar to RBD's hex. N indicates the number of bytes in the value. (In RBD, the length of a hex is the number of nibbles not the nubmer of bytes.)
- Bytes with no length is a reference type with an immutable value of any length.
- Timestamp with no pattern is a reference type in EDT. It can hold any timestamp value.
- As in RBD, it's OK to only specify the length when using the decimal type. Decimal(N) is internally mapped to decimal(N,0).
- Value types may be nullable.
More about the Bytes type
Bytes is meant to hold data with no particular format.
Assignment between two bytes values with no length is a reference assignment. Assignment between two bytes values when one or both has a length is a value assignment (data is copied). If the source is longer bytes on its right side are truncated. If the source is shorter then we don't add padding: we just don't update what was there before. For example if your bytes(3) is 0x123456 and you assign it a bytes(1) value of 0x99 then the bytes(3) ends up with 0x993456.
In order for two bytes values to be compared, they must both have a size, and the sizes must be equal. The comparison is done one byte at a time, from left to right, until a difference is found. The operand with a one instead of a zero is greater.
The bytes type supports the substring operator. The type of the result is bytes (with no length).