projects / OpenSPARC-T2-SAM / blame
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| 129 | .\" ======================================================================== | |
| 130 | .\" | |
| 131 | .IX Title "AnyDBM_File 3" | |
| 132 | .TH AnyDBM_File 3 "2001-09-21" "perl v5.8.8" "Perl Programmers Reference Guide" | |
| 133 | .SH "NAME" | |
| 134 | AnyDBM_File \- provide framework for multiple DBMs | |
| 135 | .PP | |
| 136 | NDBM_File, DB_File, GDBM_File, SDBM_File, ODBM_File \- various DBM implementations | |
| 137 | .SH "SYNOPSIS" | |
| 138 | .IX Header "SYNOPSIS" | |
| 139 | .Vb 1 | |
| 140 | \& use AnyDBM_File; | |
| 141 | .Ve | |
| 142 | .SH "DESCRIPTION" | |
| 143 | .IX Header "DESCRIPTION" | |
| 144 | This module is a \*(L"pure virtual base class\*(R"\-\-it has nothing of its own. | |
| 145 | It's just there to inherit from one of the various \s-1DBM\s0 packages. It | |
| 146 | prefers ndbm for compatibility reasons with Perl 4, then Berkeley \s-1DB\s0 (See | |
| 147 | DB_File), \s-1GDBM\s0, \s-1SDBM\s0 (which is always there\*(--it comes with Perl), and | |
| 148 | finally \s-1ODBM\s0. This way old programs that used to use \s-1NDBM\s0 via \fIdbmopen()\fR | |
| 149 | can still do so, but new ones can reorder \f(CW@ISA:\fR | |
| 150 | .PP | |
| 151 | .Vb 2 | |
| 152 | \& BEGIN { @AnyDBM_File::ISA = qw(DB_File GDBM_File NDBM_File) } | |
| 153 | \& use AnyDBM_File; | |
| 154 | .Ve | |
| 155 | .PP | |
| 156 | Having multiple \s-1DBM\s0 implementations makes it trivial to copy database formats: | |
| 157 | .PP | |
| 158 | .Vb 4 | |
| 159 | \& use POSIX; use NDBM_File; use DB_File; | |
| 160 | \& tie %newhash, 'DB_File', $new_filename, O_CREAT|O_RDWR; | |
| 161 | \& tie %oldhash, 'NDBM_File', $old_filename, 1, 0; | |
| 162 | \& %newhash = %oldhash; | |
| 163 | .Ve | |
| 164 | .Sh "\s-1DBM\s0 Comparisons" | |
| 165 | .IX Subsection "DBM Comparisons" | |
| 166 | Here's a partial table of features the different packages offer: | |
| 167 | .PP | |
| 168 | .Vb 14 | |
| 169 | \& odbm ndbm sdbm gdbm bsd-db | |
| 170 | \& ---- ---- ---- ---- ------ | |
| 171 | \& Linkage comes w/ perl yes yes yes yes yes | |
| 172 | \& Src comes w/ perl no no yes no no | |
| 173 | \& Comes w/ many unix os yes yes[0] no no no | |
| 174 | \& Builds ok on !unix ? ? yes yes ? | |
| 175 | \& Code Size ? ? small big big | |
| 176 | \& Database Size ? ? small big? ok[1] | |
| 177 | \& Speed ? ? slow ok fast | |
| 178 | \& FTPable no no yes yes yes | |
| 179 | \& Easy to build N/A N/A yes yes ok[2] | |
| 180 | \& Size limits 1k 4k 1k[3] none none | |
| 181 | \& Byte-order independent no no no no yes | |
| 182 | \& Licensing restrictions ? ? no yes no | |
| 183 | .Ve | |
| 184 | .IP "[0]" 4 | |
| 185 | .IX Item "[0]" | |
| 186 | on mixed universe machines, may be in the bsd compat library, | |
| 187 | which is often shunned. | |
| 188 | .IP "[1]" 4 | |
| 189 | .IX Item "[1]" | |
| 190 | Can be trimmed if you compile for one access method. | |
| 191 | .IP "[2]" 4 | |
| 192 | .IX Item "[2]" | |
| 193 | See DB_File. | |
| 194 | Requires symbolic links. | |
| 195 | .IP "[3]" 4 | |
| 196 | .IX Item "[3]" | |
| 197 | By default, but can be redefined. | |
| 198 | .SH "SEE ALSO" | |
| 199 | .IX Header "SEE ALSO" | |
| 200 | \&\fIdbm\fR\|(3), \fIndbm\fR\|(3), \fIDB_File\fR\|(3), perldbmfilter |