recno.3.ps

早期freebsd实现

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/F0 10/Times-Roman@0 SF 130.12(RECNO\(3\) BSD)72 48 R(Programmer')2.5 E 2.5(sM)
-.55 G 130.12(anual RECNO\(3\))340.17 48 R/F1 9/Times-Bold@0 SF -.18(NA)72 84 S
(ME).18 E F0(recno \255 record number database access method)108 96 Q F1
(SYNOPSIS)72 112.8 Q/F2 10/Times-Bold@0 SF(#include <sys/types.h>)108 124.8 Q
(#include <db)108 136.8 Q(.h>)-.4 E F1(DESCRIPTION)72 153.6 Q F0 1.158
(The routine)108 165.6 R/F3 10/Times-Italic@0 SF(dbopen)3.658 E F0 1.158
(is the library interf)3.658 F 1.158(ace to database \214les.)-.1 F 1.157
(One of the supported \214le formats is record)6.158 F 1.159(number \214les.)
108 177.6 R 1.159(The general description of the database access methods is in)
6.159 F F3(dbopen)3.66 E F0 1.16(\(3\), this manual page).24 F
(describes only the recno speci\214c information.)108 189.6 Q 1.944
(The record number data structure is either v)108 206.4 R 1.944
(ariable or \214x)-.25 F 1.944
(ed-length records stored in a \215at-\214le format,)-.15 F 2.04
(accessed by the logical record number)108 218.4 R 7.04(.T)-.55 G 2.04(he e)
286.31 218.4 R 2.04(xistence of record number \214v)-.15 F 4.54(ei)-.15 G 2.04
(mplies the e)442.1 218.4 R 2.04(xistence of)-.15 F .876
(records one through four)108 230.4 R 3.376(,a)-.4 G .875
(nd the deletion of record number one causes record number \214v)219.684 230.4
R 3.375(et)-.15 G 3.375(ob)489.93 230.4 S 3.375(er)503.305 230.4 S(enum-)514.45
230.4 Q .282(bered to record number four)108 242.4 R 2.782(,a)-.4 G 2.782(sw)
231.19 242.4 S .283(ell as the cursor)245.082 242.4 R 2.783(,i)-.4 G 2.783(fp)
316.633 242.4 S .283(ositioned after record number one, to shift do)327.746
242.4 R .283(wn one)-.25 F(record.)108 254.4 Q .373
(The recno access method speci\214c data structure pro)108 271.2 R .373
(vided to)-.15 F F3(dbopen)2.873 E F0 .373(is de\214ned in the <db)2.873 F .373
(.h> include \214le as)-.4 F(follo)108 283.2 Q(ws:)-.25 E(typedef struct {)108
300 Q(u_char b)144 312 Q -.25(va)-.15 G(l;).25 E(u_int cachesize;)144 324 Q
(inde)144 336 Q(x_t psize;)-.15 E(u_long \215ags;)144 348 Q(int lorder;)144 360
Q(size_t reclen;)144 372 Q(char *bfname;)144 384 Q 2.5(}R)108 396 S(ECNOINFO;)
121.97 396 Q(The elements of this structure are de\214ned as follo)108 412.8 Q
(ws:)-.25 E -.15(bv)108 429.6 S 16.68(al The)-.1 F .182
(delimiting byte to be used to mark the end of a record for v)2.682 F .183
(ariable-length records, and the pad)-.25 F .809(character for \214x)144 441.6
R .809(ed-length records.)-.15 F .809(If no v)5.809 F .809
(alue is speci\214ed, ne)-.25 F .809(wlines \(`)-.25 F(`\\n')-.74 E .808
('\) are used to mark the)-.74 F(end of v)144 453.6 Q
(ariable-length records and \214x)-.25 E
(ed-length records are padded with spaces.)-.15 E(cachesize)108 470.4 Q 3.159
(As)144 482.4 S .659(uggested maximum size, in bytes, of the memory cache.)
158.269 482.4 R .66(This v)5.659 F .66(alue is)-.25 F F2(only)3.16 E F0
(advisory)3.16 E 3.16(,a)-.65 G .66(nd the)514.62 482.4 R .046
(access method will allocate more memory rather than f)144 494.4 R 2.546
(ail. If)-.1 F F3(cac)2.546 E(hesize)-.15 E F0 2.546(is 0)2.546 F .046
(\(no size is speci\214ed\) a)2.546 F(def)144 506.4 Q(ault cache is used.)-.1 E
12.95(psize The)108 523.2 R .715
(recno access method stores the in-memory copies of its records in a btree.)
3.215 F .716(This v)5.716 F .716(alue is the)-.25 F .805
(size \(in bytes\) of the pages used for nodes in that tree.)144 535.2 R(If)
5.805 E F3(psize)3.305 E F0 .805(is 0 \(no page size is speci\214ed\) a)3.305 F
1.467
(page size is chosen based on the underlying \214le system I/O block size.)144
547.2 R(See)6.468 E F3(btr)3.968 E(ee)-.37 E F0 1.468(\(3\) for more).18 F
(information.)144 559.2 Q 3.51(bfname The)108 576 R .505
(recno access method stores the in-memory copies of its records in a btree.)
3.006 F .505(If bfname is non-)5.505 F .065(NULL, it speci\214es the name of t\
he btree \214le, as if speci\214ed as the \214le name for a dbopen of a btree)
144 588 R(\214le.)144 600 Q 14.61(\215ags The)108 616.8 R(\215ag v)2.5 E
(alue is speci\214ed by)-.25 E F3(or)2.5 E F0('ing an).73 E 2.5(yo)-.15 G 2.5
(ft)313.2 616.8 S(he follo)321.81 616.8 Q(wing v)-.25 E(alues:)-.25 E
(R_FIXEDLEN)144 633.6 Q .963(The records are \214x)180 645.6 R .963
(ed-length, not byte delimited.)-.15 F .963(The structure element)5.963 F F3
-.37(re)3.462 G(clen).37 E F0(speci\214es)3.462 E
(the length of the record, and the structure element)180 657.6 Q F3(bval)2.5 E
F0(is used as the pad character)2.5 E(.)-.55 E(4.4 Berk)72 732 Q(ele)-.1 E 2.5
(yD)-.15 G(istrib)132.57 732 Q 104.595(ution June)-.2 F(4, 1993)2.5 E(1)535 732
Q EP
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180 96 R 2.34(ace speci\214ed by)-.1 F/F1 10/Times-Italic@0 SF(dbopen)4.84 E F0
4.84(,t).24 G 2.34(he sequential record retrie)344.98 96 R -.25(va)-.25 G 4.84
<6c8c>.25 G 2.34(lls in both the)478.25 96 R(caller')180 108 Q 3.557(sk)-.55 G
1.357 -.15(ey a)217.337 108 T 1.057(nd data structures.).15 F 1.057
(If the R_NOKEY \215ag is speci\214ed, the)6.057 F F1(cur)3.557 E(sor)-.1 E F0
(routines)3.556 E .028(are not required to \214ll in the k)180 120 R .329 -.15
(ey s)-.1 H 2.529(tructure. This).15 F .029(permits applications to retrie)
2.529 F .329 -.15(ve r)-.25 H .029(ecords at).15 F
(the end of \214les without reading all of the interv)180 132 Q(ening records.)
-.15 E(R_SN)144 148.8 Q(APSHO)-.35 E(T)-.4 E .965
(This \215ag requires that a snapshot of the \214le be tak)180 160.8 R .964
(en when)-.1 F F1(dbopen)3.464 E F0 .964(is called, instead of)3.464 F
(permitting an)180 172.8 Q 2.5(yu)-.15 G
(nmodi\214ed records to be read from the original \214le.)245.96 172.8 Q 9.62
(lorder The)108 189.6 R 1.596(byte order for inte)4.096 F 1.596
(gers in the stored database metadata.)-.15 F 1.597
(The number should represent the)6.597 F .689(order as an inte)144 201.6 R .689
(ger; for e)-.15 F .689(xample, big endian order w)-.15 F .689
(ould be the number 4,321.)-.1 F(If)5.689 E F1(lor)3.189 E(der)-.37 E F0 .688
(is 0 \(no)3.189 F(order is speci\214ed\) the current host order is used.)144
213.6 Q 9.07(reclen The)108 230.4 R(length of a \214x)2.5 E(ed-length record.)
-.15 E .971(The data part of the k)108 247.2 R -.15(ey)-.1 G .972(/data pair u\
sed by the recno access method is the same as other access methods.).15 F .199
(The k)108 259.2 R .499 -.15(ey i)-.1 H 2.699(sd).15 G(if)157.507 259.2 Q 2.699
(ferent. The)-.25 F F1(data)2.699 E F0 .199(\214eld of the k)2.699 F .499 -.15
(ey s)-.1 H .198(hould be a pointer to a memory location of type).15 F F1 -.37
(re)2.698 G(cno_t).37 E F0 2.698(,a).68 G(s)536.11 259.2 Q .505
(de\214ned in the <db)108 271.2 R .506(.h> include \214le.)-.4 F .506
(This type is normally the lar)5.506 F .506(gest unsigned inte)-.18 F .506
(gral type a)-.15 F -.25(va)-.2 G .506(ilable to the).25 F 2.5
(implementation. The)108 283.2 R F1(size)2.5 E F0(\214eld of the k)2.5 E .3
-.15(ey s)-.1 H(hould be the size of that type.).15 E .065(In the interf)108
300 R .065(ace speci\214ed by)-.1 F F1(dbopen)2.564 E F0 2.564(,u).24 G .064
(sing the)261.548 300 R F1(put)2.564 E F0(interf)2.564 E .064
(ace to create a ne)-.1 F 2.564(wr)-.25 G .064
(ecord will cause the creation of)414.44 300 R .755(multiple, empty records if\
 the record number is more than one greater than the lar)108 312 R .755
(gest record currently in)-.18 F(the database.)108 324 Q/F2 9/Times-Bold@0 SF
(SEE ALSO)72 340.8 Q F1(dbopen)108 352.8 Q F0(\(3\),).24 E F1(hash)2.5 E F0
(\(3\),).28 E F1(mpool)2.5 E F0(\(3\),).51 E F1 -.37(re)2.5 G(cno).37 E F0
(\(3\)).18 E F1 2.755(Document Pr)108 376.8 R 2.755
(ocessing in a Relational Database System)-.45 F F0 5.254(,M).32 G 2.754
(ichael Stonebrak)362.134 376.8 R(er)-.1 E 5.254(,H)-.4 G 2.754(eidi Stettner)
454.062 376.8 R 5.254(,J)-.4 G(oseph)516.67 376.8 Q
(Kalash, Antonin Guttman, Nadene L)108 388.8 Q
(ynn, Memorandum No. UCB/ERL M82/32, May 1982.)-.55 E F2 -.09(BU)72 405.6 S(GS)
.09 E F0(Only big and little endian byte order is supported.)108 417.6 Q
(4.4 Berk)72 732 Q(ele)-.1 E 2.5(yD)-.15 G(istrib)132.57 732 Q 104.595
(ution June)-.2 F(4, 1993)2.5 E(2)535 732 Q EP
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