[Sommaire] [Imprimer]

   1  <?php
   2  
   3  /**
   4    V4.90 8 June 2006  (c) 2000-2006 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  ?>