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

   1 <?php
   2
   3 /**
   4   @version   v5.20.9  21-Dec-2016
   5   @copyright (c) 2000-2013 John Lim (jlim#natsoft.com). All rights reserved.
   6   @copyright (c) 2014      Damien Regad, Mark Newnham and the ADOdb community
   7   Released under both BSD license and Lesser GPL library license.
   8   Whenever there is any discrepancy between the two licenses,
   9   the BSD license will take precedence.
  10
  11   Set tabs to 4 for best viewing.
  12
  13 */
  14 // security - hide paths
  15 if (!defined('ADODB_DIR')) die();
  16
  17 class ADODB2_db2 extends ADODB_DataDict {
  18
  19         var $databaseType = 'db2';
  20         var $seqField = false;
  21
  22         function ActualType($meta)
  23         {
  24                 switch($meta) {
  25                 case 'C': return 'VARCHAR';
  26                 case 'XL': return 'CLOB';
  27                 case 'X': return 'VARCHAR(3600)';
  28
  29                 case 'C2': return 'VARCHAR'; // up to 32K
  30                 case 'X2': return 'VARCHAR(3600)'; // up to 32000, but default page size too small
  31
  32                 case 'B': return 'BLOB';
  33
  34                 case 'D': return 'DATE';
  35                 case 'TS':
  36                 case 'T': return 'TIMESTAMP';
  37
  38                 case 'L': return 'SMALLINT';
  39                 case 'I': return 'INTEGER';
  40                 case 'I1': return 'SMALLINT';
  41                 case 'I2': return 'SMALLINT';
  42                 case 'I4': return 'INTEGER';
  43                 case 'I8': return 'BIGINT';
  44
  45                 case 'F': return 'DOUBLE';
  46                 case 'N': return 'DECIMAL';
  47                 default:
  48                         return $meta;
  49                 }
  50         }
  51
  52         // return string must begin with space
  53         function _CreateSuffix($fname,&$ftype,$fnotnull,$fdefault,$fautoinc,$fconstraint,$funsigned)
  54         {
  55                 $suffix = '';
  56                 if ($fautoinc) return ' GENERATED ALWAYS AS IDENTITY'; # as identity start with
  57                 if (strlen($fdefault)) $suffix .= " DEFAULT $fdefault";
  58                 if ($fnotnull) $suffix .= ' NOT NULL';
  59                 if ($fconstraint) $suffix .= ' '.$fconstraint;
  60                 return $suffix;
  61         }
  62
  63         function AlterColumnSQL($tabname, $flds, $tableflds='',$tableoptions='')
  64         {
  65                 if ($this->debug) ADOConnection::outp("AlterColumnSQL not supported");
  66                 return array();
  67         }
  68
  69
  70         function DropColumnSQL($tabname, $flds, $tableflds='',$tableoptions='')
  71         {
  72                 if ($this->debug) ADOConnection::outp("DropColumnSQL not supported");
  73                 return array();
  74         }
  75
  76
  77         function ChangeTableSQL($tablename, $flds, $tableoptions = false)
  78         {
  79
  80                 /**
  81                   Allow basic table changes to DB2 databases
  82                   DB2 will fatally reject changes to non character columns
  83
  84                 */
  85
  86                 $validTypes = array("CHAR","VARC");
  87                 $invalidTypes = array("BIGI","BLOB","CLOB","DATE", "DECI","DOUB", "INTE", "REAL","SMAL", "TIME");
  88                 // check table exists
  89                 $cols = $this->MetaColumns($tablename);
  90                 if ( empty($cols)) {
  91                         return $this->CreateTableSQL($tablename, $flds, $tableoptions);
  92                 }
  93
  94                 // already exists, alter table instead
  95                 list($lines,$pkey) = $this->_GenFields($flds);
  96                 $alter = 'ALTER TABLE ' . $this->TableName($tablename);
  97                 $sql = array();
  98
  99                 foreach ( $lines as $id => $v ) {
 100                         if ( isset($cols[$id]) && is_object($cols[$id]) ) {
 101                                 /**
 102                                   If the first field of $v is the fieldname, and
 103                                   the second is the field type/size, we assume its an
 104                                   attempt to modify the column size, so check that it is allowed
 105                                   $v can have an indeterminate number of blanks between the
 106                                   fields, so account for that too
 107                                  */
 108                                 $vargs = explode(' ' , $v);
 109                                 // assume that $vargs[0] is the field name.
 110                                 $i=0;
 111                                 // Find the next non-blank value;
 112                                 for ($i=1;$i<sizeof($vargs);$i++)
 113                                         if ($vargs[$i] != '')
 114                                                 break;
 115
 116                                 // if $vargs[$i] is one of the following, we are trying to change the
 117                                 // size of the field, if not allowed, simply ignore the request.
 118                                 if (in_array(substr($vargs[$i],0,4),$invalidTypes))
 119                                         continue;
 120                                 // insert the appropriate DB2 syntax
 121                                 if (in_array(substr($vargs[$i],0,4),$validTypes)) {
 122                                         array_splice($vargs,$i,0,array('SET','DATA','TYPE'));
 123                                 }
 124
 125                                 // Now Look for the NOT NULL statement as this is not allowed in
 126                                 // the ALTER table statement. If it is in there, remove it
 127                                 if (in_array('NOT',$vargs) && in_array('NULL',$vargs)) {
 128                                         for ($i=1;$i<sizeof($vargs);$i++)
 129                                         if ($vargs[$i] == 'NOT')
 130                                                 break;
 131                                         array_splice($vargs,$i,2,'');
 132                                 }
 133                                 $v = implode(' ',$vargs);
 134                                 $sql[] = $alter . $this->alterCol . ' ' . $v;
 135                         } else {
 136                                 $sql[] = $alter . $this->addCol . ' ' . $v;
 137                         }
 138                 }
 139
 140                 return $sql;
 141         }
 142
 143 }