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38 lines
1.3 KiB
Plaintext
38 lines
1.3 KiB
Plaintext
==============================================
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Hexadecimal Numeric and Binary String Literals
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==============================================
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Support for hexadecimal numeric and binary string literals.
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Authors:
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Bill Oliver <Bill.Oliver@sas.com>
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Adriano dos Santos Fernandes <adrianosf@uol.com.br>
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Syntax:
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<numeric hex literal> ::=
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{ 0x | 0X } <hexit> [ <hexit>... ]
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<binary string literal> ::=
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{ x | X } <quote> [ <space>... ] [ { <hexit> [ <space>... ] <hexit> [ <space>... ] }... ] <quote>
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[ { <separator> <quote> [ <space>... ] [ { <hexit> [ <space>... ] <hexit> [ <space>... ] }... ] <quote> }... ]
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<digit> ::=
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0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
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<hexit> ::=
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<digit> | A | B | C | D | E | F | a | b | c | d | e | f
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Notes (numeric hex literal):
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- The max number of <hexit> should be 16.
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- If the number of <hexit> is greater than 8, the constant data type is a signed BIGINT. If it's
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less or equal than 8, the data type is a signed INTEGER. That means 0xF0000000 is -268435456 and
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0x0F0000000 is 4026531840.
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Notes (binary string literal):
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- The resulting string is defined as a CHAR(N / 2) CHARACTER SET OCTETS, where N is the number of <hexit>.
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Example:
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select 0x10, cast('0x0F0000000' as bigint) from rdb$database;
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select x'deadbeef' from rdb$database;
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