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<?php
/**
* Data Dictionary for DB2.
*
* This file is part of ADOdb, a Database Abstraction Layer library for PHP.
*
* @package ADOdb
* @link https://adodb.org Project's web site and documentation
* @link https://github.com/ADOdb/ADOdb Source code and issue tracker
*
* The ADOdb Library is dual-licensed, released under both the BSD 3-Clause
* and the GNU Lesser General Public Licence (LGPL) v2.1 or, at your option,
* any later version. This means you can use it in proprietary products.
* See the LICENSE.md file distributed with this source code for details.
* @license BSD-3-Clause
* @license LGPL-2.1-or-later
*
* @copyright 2000-2013 John Lim
* @copyright 2014 Damien Regad, Mark Newnham and the ADOdb community
*/
// security - hide paths
if (!defined('ADODB_DIR')) die();
class ADODB2_db2 extends ADODB_DataDict {
var $databaseType = 'db2';
var $seqField = false;
var $dropCol = 'ALTER TABLE %s DROP COLUMN %s';
public $blobAllowsDefaultValue = true;
public $blobAllowsNotNull = true;
function ActualType($meta)
{
switch($meta) {
case 'C': return 'VARCHAR';
case 'XL': return 'CLOB';
case 'X': return 'VARCHAR(3600)';
case 'C2': return 'VARCHAR'; // up to 32K
case 'X2': return 'VARCHAR(3600)'; // up to 32000, but default page size too small
case 'B': return 'BLOB';
case 'D': return 'DATE';
case 'TS':
case 'T': return 'TIMESTAMP';
case 'L': return 'SMALLINT';
case 'I': return 'INTEGER';
case 'I1': return 'SMALLINT';
case 'I2': return 'SMALLINT';
case 'I4': return 'INTEGER';
case 'I8': return 'BIGINT';
case 'F': return 'DOUBLE';
case 'N': return 'DECIMAL';
default:
return $meta;
}
}
// return string must begin with space
function _CreateSuffix($fname,&$ftype,$fnotnull,$fdefault,$fautoinc,$fconstraint,$funsigned)
{
$suffix = '';
if ($fautoinc) return ' GENERATED ALWAYS AS IDENTITY'; # as identity start with
if (strlen($fdefault)) $suffix .= " DEFAULT $fdefault";
if ($fnotnull) $suffix .= ' NOT NULL';
if ($fconstraint) $suffix .= ' '.$fconstraint;
return $suffix;
}
function alterColumnSQL($tabname, $flds, $tableflds='',$tableoptions='')
{
$tabname = $this->TableName ($tabname);
$sql = array();
list($lines,$pkey,$idxs) = $this->_GenFields($flds);
// genfields can return FALSE at times
if ($lines == null) $lines = array();
$alter = 'ALTER TABLE ' . $tabname . $this->alterCol . ' ';
$dataTypeWords = array('SET','DATA','TYPE');
foreach($lines as $v)
{
/*
* We must now post-process the line to insert the 'SET DATA TYPE'
* text into the alter statement
*/
$e = explode(' ',$v);
array_splice($e,1,0,$dataTypeWords);
$v = implode(' ',$e);
$sql[] = $alter . $v;
}
if (is_array($idxs))
{
foreach($idxs as $idx => $idxdef) {
$sql_idxs = $this->CreateIndexSql($idx, $tabname, $idxdef['cols'], $idxdef['opts']);
$sql = array_merge($sql, $sql_idxs);
}
}
return $sql;
}
function dropColumnSql($tabname, $flds, $tableflds='',$tableoptions='')
{
$tabname = $this->connection->getMetaCasedValue($tabname);
$flds = $this->connection->getMetaCasedValue($flds);
if (ADODB_ASSOC_CASE == ADODB_ASSOC_CASE_NATIVE )
{
/*
* METACASE_NATIVE
*/
$tabname = $this->connection->nameQuote . $tabname . $this->connection->nameQuote;
$flds = $this->connection->nameQuote . $flds . $this->connection->nameQuote;
}
$sql = sprintf($this->dropCol,$tabname,$flds);
return (array)$sql;
}
function changeTableSQL($tablename, $flds, $tableoptions = false, $dropOldFields=false)
{
/**
Allow basic table changes to DB2 databases
DB2 will fatally reject changes to non character columns
*/
$validTypes = array("CHAR","VARC");
$invalidTypes = array("BIGI","BLOB","CLOB","DATE", "DECI","DOUB", "INTE", "REAL","SMAL", "TIME");
// check table exists
$cols = $this->metaColumns($tablename);
if ( empty($cols)) {
return $this->createTableSQL($tablename, $flds, $tableoptions);
}
// already exists, alter table instead
list($lines,$pkey) = $this->_GenFields($flds);
$alter = 'ALTER TABLE ' . $this->tableName($tablename);
$sql = array();
foreach ( $lines as $id => $v ) {
/*
* If the metaCasing was NATIVE the col returned with nameQuotes
* around the field. We need to remove this for the metaColumn
* match
*/
$id = str_replace($this->connection->nameQuote,'',$id);
if ( isset($cols[$id]) && is_object($cols[$id]) ) {
/**
If the first field of $v is the fieldname, and
the second is the field type/size, we assume its an
attempt to modify the column size, so check that it is allowed
$v can have an indeterminate number of blanks between the
fields, so account for that too
*/
$vargs = explode(' ' , $v);
// assume that $vargs[0] is the field name.
$i=0;
// Find the next non-blank value;
for ($i=1;$i<sizeof($vargs);$i++)
if ($vargs[$i] != '')
break;
// if $vargs[$i] is one of the following, we are trying to change the
// size of the field, if not allowed, simply ignore the request.
if (in_array(substr($vargs[$i],0,4),$invalidTypes))
continue;
// insert the appropriate DB2 syntax
if (in_array(substr($vargs[$i],0,4),$validTypes)) {
array_splice($vargs,$i,0,array('SET','DATA','TYPE'));
}
// Now Look for the NOT NULL statement as this is not allowed in
// the ALTER table statement. If it is in there, remove it
if (in_array('NOT',$vargs) && in_array('NULL',$vargs)) {
for ($i=1;$i<sizeof($vargs);$i++)
if ($vargs[$i] == 'NOT')
break;
array_splice($vargs,$i,2,'');
}
$v = implode(' ',$vargs);
$sql[] = $alter . $this->alterCol . ' ' . $v;
} else {
$sql[] = $alter . $this->addCol . ' ' . $v;
}
}
return $sql;
}
}
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