Firebird 2.1 Language Reference Update

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Internal functions This gives you control over the type of input field set up by the engine. Please notice that with statement parameters, you always need a full-syntax cast – shorthand casts are not supported. Casting to a domain or its type: Firebird 2.1 and above support casting to a domain or its base type. When casting to a domain, any constraints (NOT NULL and/or CHECK) declared for the domain must be satisfied or the cast will fail. Please be aware that a CHECK passes if it evaluates to TRUE or NULL! So, given the following statements: create domain quint as int check (value >= 5000) select cast (2000 as quint) from rdb$database -- (1) select cast (8000 as quint) from rdb$database -- (2) select cast (null as quint) from rdb$database -- (3) only cast number (1) will result in an error. When the TYPE OF modifier is used, the expression is cast to the base type of the domain, ignoring any constraints. With domain quint defined as above, the following two casts are equivalent and will both succeed: select cast (2000 as type of quint) from rdb$database select cast (2000 as int) from rdb$database If TYPE OF is used with a (VAR)CHAR type, its character set and collation are retained: create domain iso20 varchar(20) character set iso8859_1; create domain dunl20 varchar(20) character set iso8859_1 collate du_nl; create table zinnen (zin varchar(20)); commit; insert into zinnen values ('Deze'); insert into zinnen values ('Die'); insert into zinnen values ('die'); insert into zinnen values ('deze'); select cast(zin as type of iso20) from zinnen order by 1; -- returns Deze -> Die -> deze -> die select cast(zin as type of dunl20) from zinnen order by 1; -- returns deze -> Deze -> die -> Die Casting BLOBs: Successful casting to and from BLOBs is possible since Firebird 2.1. Available in: DSQL, PSQL Added in: 2.1 CEIL(), CEILING() Description: Returns the smallest whole number greater than or equal to the argument. Result type: BIGINT or DOUBLE PRECISION Syntax: CEIL[ING] (number) 131
Important See also: FLOOR() Internal functions If the external function CEILING is declared in your database, it will override the internal function CEILING (but not CEIL). To make the internal function available, DROP or ALTER the external function (UDF). CHAR_LENGTH(), CHARACTER_LENGTH() Available in: DSQL, PSQL Added in: 2.0 Changed in: 2.1 Description: Gives the length in characters of the input string. Note With arguments of type CHAR, this function returns the formal string length (i.e. the declared length of a field or variable). If you want to obtain the “logical” length, not counting the trailing spaces, right-TRIM the argument before passing it to CHAR[ACTER]_LENGTH. Result type: INTEGER Syntax: CHAR_LENGTH (str) CHARACTER_LENGTH (str) BLOB support: Since Firebird 2.1, this function fully supports text BLOBs of any length and character set. Examples: select char_length('Hello!') from rdb$database -- returns 6 select char_length(_iso8859_1 'Grüß di!') from rdb$database -- returns 8 select char_length (cast (_iso8859_1 'Grüß di!' as varchar(24) character set utf8)) from rdb$database -- returns 8; the fact that ü and ß take up two bytes each is irrelevant select char_length (cast (_iso8859_1 'Grüß di!' as char(24) character set utf8)) from rdb$database -- returns 24: all 24 CHAR positions count See also: BIT_LENGTH(), OCTET_LENGTH 132
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Firebird 2.1 Language Reference Upd
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Table of Contents 1. Introduction .
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Firebird 2.1 Language Ref. Update F
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Firebird 2.1 Language Ref. Update A
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Firebird 2.1 Language Ref. Update s
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Chapter 1 Introduction Subject matt
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Chapter 2 Reserved words and keywor
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LOCK LOG LOG10 LPAD MATCHED MATCHIN
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Chapter 3 Available in: DSQL, PSQL
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Example: select name, age, case upp
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Data types and subtypes • Partial
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Added in: 1.0, 1.5, 1.5.1, 2.0, 2.1
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Chapter 5 DDL statements The statem
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With a special attribute (case-sens
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DIFFERENCE FILE parameter Added in:
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CREATE DOMAIN Available in: DSQL, E
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Example: DDL statements create exce
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Syntax: Example: ALTER EXTERNAL FUN
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DDL statements -- the following que
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DDL statements PROCEDURE A stored p
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DDL statements Description: Firebir
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DDL statements NOT NULL in variable
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CREATE GENERATOR Available in: DSQL
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Better alternative: DROP SEQUENCE D
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) DDL statements lastname varchar(2
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USING INDEX subclause Available in:
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ALTER COLUMN: SET DEFAULT Available
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UNIQUE constraints now allow NULLs
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Example: DDL statements create trig
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Multi-action triggers Added in: 1.5
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NOT NULL in variable declarations C
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DDL statements Restriction on recre
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DDL statements got a chance to put
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ORDER BY Available in: DSQL, PSQL A
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DML statements ROWS can also be use
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DML statements COLLATE in variable
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The same call in ESQL (with obligat
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DML statements Description: A SELEC
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DML statements Aggregate functions
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Syntax: Example: Notes: ::= DML
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DML statements select d.dept_no, d.
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DML statements FIRST and SKIP are b
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DML statements select strlen(lastna
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DML statements Description: A natur
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DML statements • Only non-negativ
Page 92 and 93: Example: DML statements plan (MyTab
Page 94 and 95: UNIONs in subqueries Changed in: 2.
Page 96 and 97: Restrictions DML statements • The
Page 98 and 99: DML statements Description: Limits
Page 100 and 101: Chapter 7 Available in: DSQL Added
Page 102 and 103: Transaction control statements If t
Page 104 and 105: Transaction control statements •
Page 106 and 107: Chapter 8 PSQL statements PSQL - Pr
Page 108 and 109: PSQL statements • If sql_datatype
Page 110 and 111: Warning PSQL statements If you chan
Page 112 and 113: PSQL statements exception ex_bad_ty
Page 114 and 115: PSQL statements as declare variable
Page 116 and 117: Examples: PSQL statements thoroughl
Page 118 and 119: leave; end end c = 0; PSQL statemen
Page 120 and 121: Chapter 9 Available in: DSQL, PSQL
Page 122 and 123: Changed in: 2.0 Context variables D
Page 124 and 125: Context variables its execution was
Page 126 and 127: Context variables Description: OLD
Page 128 and 129: Chapter 10 Changed in: 2.0 Operator
Page 130 and 131: UNION as subselect Changed in: 2.0
Page 132 and 133: Chapter 11 Aggregate functions Aggr
Page 134 and 135: Chapter 12 Available in: DSQL, PSQL
Page 136 and 137: • If the argument is NULL, NULL i
Page 138 and 139: Result type: INTEGER or BIGINT Synt
Page 140 and 141: Result type: INTEGER Syntax: BIT_LE
Page 144 and 145: Available in: DSQL, PSQL Added in:
Page 148 and 149: Example: The equivalent CASE constr
Page 150 and 151: WEEK Bug alert Internal functions M
Page 152 and 153: Added in: 2.1 Internal functions De
Page 154 and 155: Internal functions • If x is nega
Page 156 and 157: Examples: Internal functions lpad (
Page 158 and 159: Internal functions This will return
Page 160 and 161: Internal functions overlay ('Goodby
Page 164 and 165: Internal functions Description: Cre
Page 166 and 167: Internal functions reverse ('Was it
Page 168 and 169: Added in: 2.1 Internal functions De
Page 170 and 171: Syntax: SINH (number) Important Int
Page 174 and 175: Notes: Internal functions • If th
Page 176 and 177: Description: Returns the arc cosine
Page 178 and 179: Declaration: External functions (UD
Page 180 and 181: Library: ib_udf Changed in: 1.0, 2.
Page 182 and 183: Better alternative: Internal functi
Page 184 and 185: External functions (UDFs) Descripti
Page 186 and 187: Syntax: cot (angle) Declaration: Ex
Page 188 and 189: Declaration: External functions (UD
Page 190 and 191: Library: ib_udf Added in: IB Change
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Changed in: 1.5, 1.5.2, 2.0 Better
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External functions (UDFs) DECLARE E
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See sright. Library: fbudf Added in
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Notes: External functions (UDFs) Fo
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Syntax: sign (number) Declaration:
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Library: fbudf Added in: 1.0 (Win),
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Notes: External functions (UDFs) th
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Better alternative: Internal functi
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Appendix A: Notes Character set NON
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Table A.1. How TPB settings affect
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Notes A note on CSTRING parameters
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Notes Maximum number of indices in
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Document History DDL statements ::
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Document History Internal functions
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Appendix C: License notice The cont
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Firebird 2.1 Language Reference Update

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