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| 16 | <title>7.11.1 Database Objects </title> | |
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| 54 | <H2><A NAME="SECTION0091110000000000000000"></A><A NAME="dbhash-objects"></A> | |
| 55 | <BR> | |
| 56 | 7.11.1 Database Objects | |
| 57 | </H2> | |
| 58 | ||
| 59 | <P> | |
| 60 | The database objects returned by <tt class="function">open()</tt> provide the methods | |
| 61 | common to all the DBM-style databases and mapping objects. The following | |
| 62 | methods are available in addition to the standard methods. | |
| 63 | ||
| 64 | <P> | |
| 65 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 66 | <td><nobr><b><tt id='l2h-2789' xml:id='l2h-2789' class="method">first</tt></b>(</nobr></td> | |
| 67 | <td><var></var>)</td></tr></table></dt> | |
| 68 | <dd> | |
| 69 | It's possible to loop over every key/value pair in the database using | |
| 70 | this method and the <tt class="method">next()</tt> method. The traversal is ordered by | |
| 71 | the databases internal hash values, and won't be sorted by the key | |
| 72 | values. This method returns the starting key. | |
| 73 | </dl> | |
| 74 | ||
| 75 | <P> | |
| 76 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 77 | <td><nobr><b><tt id='l2h-2790' xml:id='l2h-2790' class="method">last</tt></b>(</nobr></td> | |
| 78 | <td><var></var>)</td></tr></table></dt> | |
| 79 | <dd> | |
| 80 | Return the last key/value pair in a database traversal. This may be used to | |
| 81 | begin a reverse-order traversal; see <tt class="method">previous()</tt>. | |
| 82 | </dl> | |
| 83 | ||
| 84 | <P> | |
| 85 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 86 | <td><nobr><b><tt id='l2h-2791' xml:id='l2h-2791' class="method">next</tt></b>(</nobr></td> | |
| 87 | <td><var></var>)</td></tr></table></dt> | |
| 88 | <dd> | |
| 89 | Returns the key next key/value pair in a database traversal. The | |
| 90 | following code prints every key in the database <code>db</code>, without | |
| 91 | having to create a list in memory that contains them all: | |
| 92 | ||
| 93 | <P> | |
| 94 | <div class="verbatim"><pre> | |
| 95 | print db.first() | |
| 96 | for i in xrange(1, len(db)): | |
| 97 | print db.next() | |
| 98 | </pre></div> | |
| 99 | </dl> | |
| 100 | ||
| 101 | <P> | |
| 102 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 103 | <td><nobr><b><tt id='l2h-2792' xml:id='l2h-2792' class="method">previous</tt></b>(</nobr></td> | |
| 104 | <td><var></var>)</td></tr></table></dt> | |
| 105 | <dd> | |
| 106 | Returns the previous key/value pair in a forward-traversal of the database. | |
| 107 | In conjunction with <tt class="method">last()</tt>, this may be used to implement | |
| 108 | a reverse-order traversal. | |
| 109 | </dl> | |
| 110 | ||
| 111 | <P> | |
| 112 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 113 | <td><nobr><b><tt id='l2h-2793' xml:id='l2h-2793' class="method">sync</tt></b>(</nobr></td> | |
| 114 | <td><var></var>)</td></tr></table></dt> | |
| 115 | <dd> | |
| 116 | This method forces any unwritten data to be written to the disk. | |
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| 153 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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