DBA 函数

dba_close — Close a DBA database
dba_delete — Delete DBA entry specified by key
dba_exists — Check whether key exists
dba_fetch — Fetch data specified by key
dba_firstkey — Fetch first key
dba_handlers — List all the handlers available
dba_insert — Insert entry
dba_key_split — Splits a key in string representation into array representation
dba_list — List all open database files
dba_nextkey — Fetch next key
dba_open — Open database
dba_optimize — Optimize database
dba_popen — Open database persistently
dba_replace — Replace or insert entry
dba_sync — Synchronize database

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[#1] Franz Korntner [2012-02-21 09:10:33]

If you need a 'download data' button that automatically fires up a spreadsheet (like Excel), find that fputcsv() isn't working as expected, that none of the installed DBA database engines create a spreadsheet that can be opened, and that XLS generating components are just too heavy weight, then this might just hit the spot:

<?php // simple table to present $data = array( array('col1','col2'), array(1,2), array(3,4) ); // pretend content (which is XML) is XLS native header("Pragma: public"); header("Expires: 0"); header("Cache-Control: must-revalidate, post-check=0, pre-check=0"); header("Cache-Control: private", false); header("Content-Type: application/vnd.ms-excel"); header("Content-Disposition: attachment; filename=\"sheet.xls\";" ); // construct skeleton $dom = new DOMDocument('1.0', 'utf-8'); $dom->formatOutput = $dom->preserveSpaces = true; // optional $n = new DOMProcessingInstruction('mso-application', 'progid="Excel.Sheet"'); $dom->appendChild($n); $workbook = $dom->appendChild(new DOMElement('Workbook')); $workbook->setAttribute('xmlns','urn:schemas-microsoft-com:office:spreadsheet'); $workbook->setAttribute('xmlns:o','urn:schemas-microsoft-com:office:office'); $workbook->setAttribute('xmlns:x','urn:schemas-microsoft-com:office:excel'); $workbook->setAttribute('xmlns:ss','xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet'); $workbook->setAttribute('xmlns:html','http://www.w3.org/TR/REC-html40'); $styles = $workbook->appendChild(new DOMElement('Styles')); $style = $styles->appendChild(new DOMElement('Style')); $style->setAttribute('ss:ID','Default'); $worksheet = $workbook->appendChild(new DOMElement('Worksheet')); $worksheet->setAttribute('ss:Name','sheet1'); $xmltable = $worksheet->appendChild(new DOMElement('Table')); // populate with data foreach ($data as $datarow) { $xmlrow = $xmltable->appendChild(new DOMElement('Row')); foreach ($datarow as $datacell) { $xmlcell = $xmlrow->appendChild(new DOMElement('Cell')); $xmldata = $xmlcell->appendChild(new DOMElement('Data', $datacell)); $xmldata->setAttribute('ss:Type', is_numeric($datacell) ? 'Number' : 'String'); } } // display and quit echo $dom->saveXML(); ?>

[#2] doppelbauer at gmail dot com [2006-10-14 07:47:56]

Benchmark test:

http://qdbm.sourceforge.net/benchmark.pdf

[#3] jason [2004-12-21 07:33:32]

Don't make the dumb mistake I did, if you copy the first example at the top and modify it for test, the dba_open specifies "n" which will truncate the database that you are pointing to. Make sure you change it to "r" if you just want to read from an existing dbm file.

[#4] kevinphpdotnet at stormtide dot ca [2004-03-17 11:10:45]

When using db4 on redhat 7.3 you may get signal 11s on the apache child processes. The installation test scripts will report that db4 is working correctly as the cli will not sig 11 out. The solution is to check to see if mod_rewrite is installed with apache, if it is either dereference it from libdb.so.3 or build apache without mod rewrite. Once this is done you will no longer have your child processes dying out and db4 will work. If you do not get a sig 11 after dba_open just ignore this comment.

[#5] djm at web dot us dot uu dot net [1999-10-17 15:28:04]

With db2, you need to call dba_sync() to get the data written to disk; the examples are missing this. db2 uses
the BTREE file format, not the more common HASH.
BTREE is faster, though, in my tests, so it's a good
choice.

DBA 函数

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