dbopen.3.ps

早期freebsd实现

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/F0 10/Times-Roman@0 SF 124.01(DBOPEN\(3\) BSD)72 48 R(Programmer')2.5 E 2.5
(sM)-.55 G 124.01(anual DBOPEN\(3\))340.17 48 R/F1 9/Times-Bold@0 SF -.18(NA)72
84 S(ME).18 E F0(dbopen \255 database access methods)108 96 Q F1(SYNOPSIS)72
112.8 Q/F2 10/Times-Bold@0 SF(#include <sys/types.h>)108 124.8 Q
(#include <limits.h>)108 136.8 Q(#include <db)108 148.8 Q(.h>)-.4 E(DB *)108
172.8 Q(dbopen\(const char *\214le, int \215ags, int mode, DBTYPE type,)108
184.8 Q(const v)158 196.8 Q(oid *openinf)-.1 E(o\);)-.25 E F1(DESCRIPTION)72
213.6 Q/F3 10/Times-Italic@0 SF(Dbopen)108 225.6 Q F0 .032
(is the library interf)2.532 F .031(ace to database \214les.)-.1 F .031
(The supported \214le formats are btree, hashed and UNIX \214le)5.031 F 2.82
(oriented. The)108 237.6 R .32
(btree format is a representation of a sorted, balanced tree structure.)2.82 F
.321(The hashed format is an)5.321 F -.15(ex)108 249.6 S .424
(tensible, dynamic hashing scheme.).15 F .423
(The \215at-\214le format is a byte stream \214le with \214x)5.423 F .423
(ed or v)-.15 F .423(ariable length)-.25 F 2.906(records. The)108 261.6 R .407
(formats and \214le format speci\214c information are described in detail in t\
heir respecti)2.906 F .707 -.15(ve m)-.25 H(anual).15 E(pages)108 273.6 Q F3
(btr)2.5 E(ee)-.37 E F0(\(3\),).18 E F3(hash)2.5 E F0(\(3\) and).28 E F3 -.37
(re)2.5 G(cno).37 E F0(\(3\).).18 E .433(Dbopen opens)108 290.4 R F3(\214le)
2.933 E F0 .433(for reading and/or writing.)2.933 F .433(Files ne)5.433 F -.15
(ve)-.25 G 2.933(ri).15 G .433(ntended to be preserv)346.737 290.4 R .433
(ed on disk may be created)-.15 F(by setting the \214le parameter to NULL.)108
302.4 Q(The)108 319.2 Q F3<8d61>4.661 E(gs)-.1 E F0(and)4.661 E F3 2.161
(mode ar)4.661 F(guments)-.37 E F0 2.161(are as speci\214ed to the)4.661 F F3
(open)4.661 E F0 2.162(\(2\) routine, ho).24 F(we)-.25 E -.15(ve)-.25 G 2.962
-.4(r, o).15 H 2.162(nly the O_CREA).4 F -.74(T,)-1.11 G .128
(O_EXCL, O_EXLOCK, O_NONBLOCK, O_RDONL)108 331.2 R 2.708 -1.29(Y, O)-1 H(_RD)
1.29 E .128(WR, O_SHLOCK and O_TR)-.3 F .127(UNC \215ags are)-.4 F 2.5
(meaningful. \(Note,)108 343.2 R(opening a database \214le O_WR)2.5 E(ONL)-.4 E
2.5(Yi)-1 G 2.5(sn)342.67 343.2 S(ot possible.\))354.06 343.2 Q(The)108 360 Q
F3(type)5.337 E F0(ar)5.337 E 2.837
(gument is of type DBTYPE \(as de\214ned in the <db)-.18 F 2.838
(.h> include \214le\) and may be set to)-.4 F(DB_BTREE, DB_HASH or DB_RECNO.)
108 372 Q(The)108 388.8 Q F3(openinfo)2.85 E F0(ar)2.85 E .349(gument is a poi\
nter to an access method speci\214c structure described in the access method')
-.18 F(s)-.55 E .03(manual page.)108 400.8 R(If)5.03 E F3(openinfo)2.53 E F0
.031(is NULL, each access method will use def)2.53 F .031
(aults appropriate for the system and the)-.1 F(access method.)108 412.8 Q F3
(Dbopen)108 429.6 Q F0 .416
(returns a pointer to a DB structure on success and NULL on error)2.917 F 5.416
(.T)-.55 G .416(he DB structure is de\214ned in)423.21 429.6 R(the <db)108
441.6 Q(.h> include \214le, and contains at least the follo)-.4 E
(wing \214elds:)-.25 E(typedef struct {)108 465.6 Q(DBTYPE type;)144 477.6 Q
(int \(*close\)\(const DB *db\);)144 489.6 Q
(int \(*del\)\(const DB *db, const DBT *k)144 501.6 Q -.15(ey)-.1 G 2.5(,u)-.5
G(_int \215ags\);)318.92 501.6 Q(int \(*fd\)\(const DB *db\);)144 513.6 Q
(int \(*get\)\(const DB *db, DBT *k)144 525.6 Q -.15(ey)-.1 G 2.5(,D)-.5 G
(BT *data, u_int \215ags\);)297.53 525.6 Q(int \(*put\)\(const DB *db, DBT *k)
144 537.6 Q -.15(ey)-.1 G 2.5(,c)-.5 G(onst DBT *data,)295.31 537.6 Q
(u_int \215ags\);)194 549.6 Q(int \(*sync\)\(const DB *db, u_int \215ags\);)144
561.6 Q(int \(*seq\)\(const DB *db, DBT *k)144 573.6 Q -.15(ey)-.1 G 2.5(,D)-.5
G(BT *data, u_int \215ags\);)298.64 573.6 Q 2.5(}D)108 585.6 S(B;)122.52 585.6
Q .101
(These elements describe a database type and a set of functions performing v)
108 602.4 R .101(arious actions.)-.25 F .101(These functions)5.101 F(tak)108