lib/adodb/datadict/datadict-db2.inc.php

   1 <?php
   2
   3 /**
   4   V4.98 13 Feb 2008  (c) 2000-2008 John Lim (jlim#natsoft.com.my). All rights reserved.
   5   Released under both BSD license and Lesser GPL library license.
   6   Whenever there is any discrepancy between the two licenses,
   7   the BSD license will take precedence.
   8
   9   Set tabs to 4 for best viewing.
  10
  11 */
  12 // security - hide paths
  13 if (!defined('ADODB_DIR')) die();
  14
  15 class ADODB2_db2 extends ADODB_DataDict {
  16
  17         var $databaseType = 'db2';
  18         var $seqField = false;
  19
  20         function ActualType($meta)
  21         {
  22                 switch($meta) {
  23                 case 'C': return 'VARCHAR';
  24                 case 'XL': return 'CLOB';
  25                 case 'X': return 'VARCHAR(3600)';
  26
  27                 case 'C2': return 'VARCHAR'; // up to 32K
  28                 case 'X2': return 'VARCHAR(3600)'; // up to 32000, but default page size too small
  29
  30                 case 'B': return 'BLOB';
  31
  32                 case 'D': return 'DATE';
  33                 case 'T': return 'TIMESTAMP';
  34
  35                 case 'L': return 'SMALLINT';
  36                 case 'I': return 'INTEGER';
  37                 case 'I1': return 'SMALLINT';
  38                 case 'I2': return 'SMALLINT';
  39                 case 'I4': return 'INTEGER';
  40                 case 'I8': return 'BIGINT';
  41
  42                 case 'F': return 'DOUBLE';
  43                 case 'N': return 'DECIMAL';
  44                 default:
  45                         return $meta;
  46                 }
  47         }
  48
  49         // return string must begin with space
  50         function _CreateSuffix($fname,$ftype,$fnotnull,$fdefault,$fautoinc,$fconstraint)
  51         {
  52                 $suffix = '';
  53                 if ($fautoinc) return ' GENERATED ALWAYS AS IDENTITY'; # as identity start with
  54                 if (strlen($fdefault)) $suffix .= " DEFAULT $fdefault";
  55                 if ($fnotnull) $suffix .= ' NOT NULL';
  56                 if ($fconstraint) $suffix .= ' '.$fconstraint;
  57                 return $suffix;
  58         }
  59
  60         function AlterColumnSQL($tabname, $flds)
  61         {
  62                 if ($this->debug) ADOConnection::outp("AlterColumnSQL not supported");
  63                 return array();
  64         }
  65
  66
  67         function DropColumnSQL($tabname, $flds)
  68         {
  69                 if ($this->debug) ADOConnection::outp("DropColumnSQL not supported");
  70                 return array();
  71         }
  72
  73
  74         function ChangeTableSQL($tablename, $flds, $tableoptions = false)
  75         {
  76
  77                 /**
  78                   Allow basic table changes to DB2 databases
  79                   DB2 will fatally reject changes to non character columns
  80
  81                 */
  82
  83                 $validTypes = array("CHAR","VARC");
  84                 $invalidTypes = array("BIGI","BLOB","CLOB","DATE", "DECI","DOUB", "INTE", "REAL","SMAL", "TIME");
  85                 // check table exists
  86                 $cols = &$this->MetaColumns($tablename);
  87                 if ( empty($cols)) {
  88                         return $this->CreateTableSQL($tablename, $flds, $tableoptions);
  89                 }
  90
  91                 // already exists, alter table instead
  92                 list($lines,$pkey) = $this->_GenFields($flds);
  93                 $alter = 'ALTER TABLE ' . $this->TableName($tablename);
  94                 $sql = array();
  95
  96                 foreach ( $lines as $id => $v ) {
  97                         if ( isset($cols[$id]) && is_object($cols[$id]) ) {
  98                                 /**
  99                                   If the first field of $v is the fieldname, and
 100                                   the second is the field type/size, we assume its an
 101                                   attempt to modify the column size, so check that it is allowed
 102                                   $v can have an indeterminate number of blanks between the
 103                                   fields, so account for that too
 104                                  */
 105                                 $vargs = explode(' ' , $v);
 106                                 // assume that $vargs[0] is the field name.
 107                                 $i=0;
 108                                 // Find the next non-blank value;
 109                                 for ($i=1;$i<sizeof($vargs);$i++)
 110                                         if ($vargs[$i] != '')
 111                                                 break;
 112
 113                                 // if $vargs[$i] is one of the following, we are trying to change the
 114                                 // size of the field, if not allowed, simply ignore the request.
 115                                 if (in_array(substr($vargs[$i],0,4),$invalidTypes))
 116                                         continue;
 117                                 // insert the appropriate DB2 syntax
 118                                 if (in_array(substr($vargs[$i],0,4),$validTypes)) {
 119                                         array_splice($vargs,$i,0,array('SET','DATA','TYPE'));
 120                                 }
 121
 122                                 // Now Look for the NOT NULL statement as this is not allowed in
 123                                 // the ALTER table statement. If it is in there, remove it
 124                                 if (in_array('NOT',$vargs) && in_array('NULL',$vargs)) {
 125                                         for ($i=1;$i<sizeof($vargs);$i++)
 126                                         if ($vargs[$i] == 'NOT')
 127                                                 break;
 128                                         array_splice($vargs,$i,2,'');
 129                                 }
 130                                 $v = implode(' ',$vargs);
 131                                 $sql[] = $alter . $this->alterCol . ' ' . $v;
 132                         } else {
 133                                 $sql[] = $alter . $this->addCol . ' ' . $v;
 134                         }
 135                 }
 136
 137                 return $sql;
 138         }
 139
 140 }
 141
 142
 143 ?>