143 lines
3.8 KiB
PHP
143 lines
3.8 KiB
PHP
<?php
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/**
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V5.06 16 Oct 2008 (c) 2000-2008 John Lim (jlim#natsoft.com). All rights reserved.
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Released under both BSD license and Lesser GPL library license.
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Whenever there is any discrepancy between the two licenses,
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the BSD license will take precedence.
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Set tabs to 4 for best viewing.
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*/
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// security - hide paths
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if (!defined('ADODB_DIR')) die();
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class ADODB2_db2 extends ADODB_DataDict {
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var $databaseType = 'db2';
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var $seqField = false;
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function ActualType($meta)
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{
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switch($meta) {
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case 'C': return 'VARCHAR';
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case 'XL': return 'CLOB';
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case 'X': return 'VARCHAR(3600)';
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case 'C2': return 'VARCHAR'; // up to 32K
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case 'X2': return 'VARCHAR(3600)'; // up to 32000, but default page size too small
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case 'B': return 'BLOB';
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case 'D': return 'DATE';
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case 'T': return 'TIMESTAMP';
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case 'L': return 'SMALLINT';
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case 'I': return 'INTEGER';
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case 'I1': return 'SMALLINT';
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case 'I2': return 'SMALLINT';
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case 'I4': return 'INTEGER';
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case 'I8': return 'BIGINT';
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case 'F': return 'DOUBLE';
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case 'N': return 'DECIMAL';
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default:
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return $meta;
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}
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}
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// return string must begin with space
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function _CreateSuffix($fname,$ftype,$fnotnull,$fdefault,$fautoinc,$fconstraint)
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{
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$suffix = '';
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if ($fautoinc) return ' GENERATED ALWAYS AS IDENTITY'; # as identity start with
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if (strlen($fdefault)) $suffix .= " DEFAULT $fdefault";
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if ($fnotnull) $suffix .= ' NOT NULL';
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if ($fconstraint) $suffix .= ' '.$fconstraint;
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return $suffix;
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}
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function AlterColumnSQL($tabname, $flds)
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{
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if ($this->debug) ADOConnection::outp("AlterColumnSQL not supported");
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return array();
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}
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function DropColumnSQL($tabname, $flds)
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{
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if ($this->debug) ADOConnection::outp("DropColumnSQL not supported");
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return array();
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}
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function ChangeTableSQL($tablename, $flds, $tableoptions = false)
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{
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/**
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Allow basic table changes to DB2 databases
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DB2 will fatally reject changes to non character columns
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*/
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$validTypes = array("CHAR","VARC");
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$invalidTypes = array("BIGI","BLOB","CLOB","DATE", "DECI","DOUB", "INTE", "REAL","SMAL", "TIME");
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// check table exists
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$cols = $this->MetaColumns($tablename);
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if ( empty($cols)) {
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return $this->CreateTableSQL($tablename, $flds, $tableoptions);
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}
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// already exists, alter table instead
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list($lines,$pkey) = $this->_GenFields($flds);
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$alter = 'ALTER TABLE ' . $this->TableName($tablename);
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$sql = array();
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foreach ( $lines as $id => $v ) {
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if ( isset($cols[$id]) && is_object($cols[$id]) ) {
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/**
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If the first field of $v is the fieldname, and
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the second is the field type/size, we assume its an
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attempt to modify the column size, so check that it is allowed
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$v can have an indeterminate number of blanks between the
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fields, so account for that too
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*/
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$vargs = explode(' ' , $v);
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// assume that $vargs[0] is the field name.
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$i=0;
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// Find the next non-blank value;
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for ($i=1;$i<sizeof($vargs);$i++)
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if ($vargs[$i] != '')
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break;
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// if $vargs[$i] is one of the following, we are trying to change the
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// size of the field, if not allowed, simply ignore the request.
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if (in_array(substr($vargs[$i],0,4),$invalidTypes))
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continue;
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// insert the appropriate DB2 syntax
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if (in_array(substr($vargs[$i],0,4),$validTypes)) {
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array_splice($vargs,$i,0,array('SET','DATA','TYPE'));
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}
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// Now Look for the NOT NULL statement as this is not allowed in
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// the ALTER table statement. If it is in there, remove it
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if (in_array('NOT',$vargs) && in_array('NULL',$vargs)) {
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for ($i=1;$i<sizeof($vargs);$i++)
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if ($vargs[$i] == 'NOT')
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break;
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array_splice($vargs,$i,2,'');
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}
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$v = implode(' ',$vargs);
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$sql[] = $alter . $this->alterCol . ' ' . $v;
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} else {
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$sql[] = $alter . $this->addCol . ' ' . $v;
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}
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}
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return $sql;
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}
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}
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?>
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