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   1  <?php
   2  
   3  /*
   4  V4.65 22 July 2005  (c) 2000-2005 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    Set tabs to 8.
   9   
  10  */ 
  11  
  12  class ADODB_pdo_pgsql extends ADODB_pdo {
  13  var $metaDatabasesSQL = "select datname from pg_database where datname not in ('template0','template1') order by 1";
  14      var $metaTablesSQL = "select tablename,'T' from pg_tables where tablename not like 'pg\_%'
  15      and tablename not in ('sql_features', 'sql_implementation_info', 'sql_languages',
  16       'sql_packages', 'sql_sizing', 'sql_sizing_profiles') 
  17      union 
  18          select viewname,'V' from pg_views where viewname not like 'pg\_%'";
  19      //"select tablename from pg_tables where tablename not like 'pg_%' order by 1";
  20      var $isoDates = true; // accepts dates in ISO format
  21      var $sysDate = "CURRENT_DATE";
  22      var $sysTimeStamp = "CURRENT_TIMESTAMP";
  23      var $blobEncodeType = 'C';
  24      var $metaColumnsSQL = "SELECT a.attname,t.typname,a.attlen,a.atttypmod,a.attnotnull,a.atthasdef,a.attnum 
  25          FROM pg_class c, pg_attribute a,pg_type t 
  26          WHERE relkind in ('r','v') AND (c.relname='%s' or c.relname = lower('%s')) and a.attname not like '....%%'
  27  AND a.attnum > 0 AND a.atttypid = t.oid AND a.attrelid = c.oid ORDER BY a.attnum";
  28  
  29      // used when schema defined
  30      var $metaColumnsSQL1 = "SELECT a.attname, t.typname, a.attlen, a.atttypmod, a.attnotnull, a.atthasdef, a.attnum 
  31  FROM pg_class c, pg_attribute a, pg_type t, pg_namespace n 
  32  WHERE relkind in ('r','v') AND (c.relname='%s' or c.relname = lower('%s'))
  33   and c.relnamespace=n.oid and n.nspname='%s' 
  34      and a.attname not like '....%%' AND a.attnum > 0 
  35      AND a.atttypid = t.oid AND a.attrelid = c.oid ORDER BY a.attnum";
  36      
  37      // get primary key etc -- from Freek Dijkstra
  38      var $metaKeySQL = "SELECT ic.relname AS index_name, a.attname AS column_name,i.indisunique AS unique_key, i.indisprimary AS primary_key 
  39      FROM pg_class bc, pg_class ic, pg_index i, pg_attribute a WHERE bc.oid = i.indrelid AND ic.oid = i.indexrelid AND (i.indkey[0] = a.attnum OR i.indkey[1] = a.attnum OR i.indkey[2] = a.attnum OR i.indkey[3] = a.attnum OR i.indkey[4] = a.attnum OR i.indkey[5] = a.attnum OR i.indkey[6] = a.attnum OR i.indkey[7] = a.attnum) AND a.attrelid = bc.oid AND bc.relname = '%s'";
  40      
  41      var $hasAffectedRows = true;
  42      var $hasLimit = false;    // set to true for pgsql 7 only. support pgsql/mysql SELECT * FROM TABLE LIMIT 10
  43      // below suggested by Freek Dijkstra 
  44      var $true = 't';        // string that represents TRUE for a database
  45      var $false = 'f';        // string that represents FALSE for a database
  46      var $fmtDate = "'Y-m-d'";    // used by DBDate() as the default date format used by the database
  47      var $fmtTimeStamp = "'Y-m-d G:i:s'"; // used by DBTimeStamp as the default timestamp fmt.
  48      var $hasMoveFirst = true;
  49      var $hasGenID = true;
  50      var $_genIDSQL = "SELECT NEXTVAL('%s')";
  51      var $_genSeqSQL = "CREATE SEQUENCE %s START %s";
  52      var $_dropSeqSQL = "DROP SEQUENCE %s";
  53      var $metaDefaultsSQL = "SELECT d.adnum as num, d.adsrc as def from pg_attrdef d, pg_class c where d.adrelid=c.oid and c.relname='%s' order by d.adnum";
  54      var $random = 'random()';        /// random function
  55      var $concat_operator='||';
  56      
  57  	function _init($parentDriver)
  58      {
  59      
  60          $parentDriver->hasTransactions = false;
  61      }
  62      
  63  	function ServerInfo()
  64      {
  65          $arr['description'] = ADOConnection::GetOne("select version()");
  66          $arr['version'] = ADOConnection::_findvers($arr['description']);
  67          return $arr;
  68      }
  69      
  70      function &SelectLimit($sql,$nrows=-1,$offset=-1,$inputarr=false,$secs2cache=0) 
  71      {
  72           $offsetStr = ($offset >= 0) ? " OFFSET $offset" : '';
  73           $limitStr  = ($nrows >= 0)  ? " LIMIT $nrows" : '';
  74           if ($secs2cache)
  75                $rs =& $this->CacheExecute($secs2cache,$sql."$limitStr$offsetStr",$inputarr);
  76           else
  77                $rs =& $this->Execute($sql."$limitStr$offsetStr",$inputarr);
  78          
  79          return $rs;
  80      }
  81      
  82      function &MetaTables($ttype=false,$showSchema=false,$mask=false) 
  83      {
  84          $info = $this->ServerInfo();
  85          if ($info['version'] >= 7.3) {
  86              $this->metaTablesSQL = "select tablename,'T' from pg_tables where tablename not like 'pg\_%'
  87                and schemaname  not in ( 'pg_catalog','information_schema')
  88      union 
  89          select viewname,'V' from pg_views where viewname not like 'pg\_%'  and schemaname  not in ( 'pg_catalog','information_schema') ";
  90          }
  91          if ($mask) {
  92              $save = $this->metaTablesSQL;
  93              $mask = $this->qstr(strtolower($mask));
  94              if ($info['version']>=7.3)
  95                  $this->metaTablesSQL = "
  96  select tablename,'T' from pg_tables where tablename like $mask and schemaname not in ( 'pg_catalog','information_schema')  
  97   union 
  98  select viewname,'V' from pg_views where viewname like $mask and schemaname  not in ( 'pg_catalog','information_schema')  ";
  99              else
 100                  $this->metaTablesSQL = "
 101  select tablename,'T' from pg_tables where tablename like $mask 
 102   union 
 103  select viewname,'V' from pg_views where viewname like $mask";
 104          }
 105          $ret =& ADOConnection::MetaTables($ttype,$showSchema);
 106          
 107          if ($mask) {
 108              $this->metaTablesSQL = $save;
 109          }
 110          return $ret;
 111      }
 112      
 113      function &MetaColumns($table,$normalize=true) 
 114      {
 115      global $ADODB_FETCH_MODE;
 116      
 117          $schema = false;
 118          $this->_findschema($table,$schema);
 119          
 120          if ($normalize) $table = strtolower($table);
 121  
 122          $save = $ADODB_FETCH_MODE;
 123          $ADODB_FETCH_MODE = ADODB_FETCH_NUM;
 124          if ($this->fetchMode !== false) $savem = $this->SetFetchMode(false);
 125          
 126          if ($schema) $rs =& $this->Execute(sprintf($this->metaColumnsSQL1,$table,$table,$schema));
 127          else $rs =& $this->Execute(sprintf($this->metaColumnsSQL,$table,$table));
 128          if (isset($savem)) $this->SetFetchMode($savem);
 129          $ADODB_FETCH_MODE = $save;
 130          
 131          if ($rs === false) {
 132              $false = false;
 133              return $false;
 134          }
 135          if (!empty($this->metaKeySQL)) {
 136              // If we want the primary keys, we have to issue a separate query
 137              // Of course, a modified version of the metaColumnsSQL query using a 
 138              // LEFT JOIN would have been much more elegant, but postgres does 
 139              // not support OUTER JOINS. So here is the clumsy way.
 140              
 141              $ADODB_FETCH_MODE = ADODB_FETCH_ASSOC;
 142              
 143              $rskey = $this->Execute(sprintf($this->metaKeySQL,($table)));
 144              // fetch all result in once for performance.
 145              $keys =& $rskey->GetArray();
 146              if (isset($savem)) $this->SetFetchMode($savem);
 147              $ADODB_FETCH_MODE = $save;
 148              
 149              $rskey->Close();
 150              unset($rskey);
 151          }
 152  
 153          $rsdefa = array();
 154          if (!empty($this->metaDefaultsSQL)) {
 155              $ADODB_FETCH_MODE = ADODB_FETCH_ASSOC;
 156              $sql = sprintf($this->metaDefaultsSQL, ($table));
 157              $rsdef = $this->Execute($sql);
 158              if (isset($savem)) $this->SetFetchMode($savem);
 159              $ADODB_FETCH_MODE = $save;
 160              
 161              if ($rsdef) {
 162                  while (!$rsdef->EOF) {
 163                      $num = $rsdef->fields['num'];
 164                      $s = $rsdef->fields['def'];
 165                      if (strpos($s,'::')===false && substr($s, 0, 1) == "'") { /* quoted strings hack... for now... fixme */
 166                          $s = substr($s, 1);
 167                          $s = substr($s, 0, strlen($s) - 1);
 168                      }
 169  
 170                      $rsdefa[$num] = $s;
 171                      $rsdef->MoveNext();
 172                  }
 173              } else {
 174                  ADOConnection::outp( "==> SQL => " . $sql);
 175              }
 176              unset($rsdef);
 177          }
 178      
 179          $retarr = array();
 180          while (!$rs->EOF) {     
 181              $fld = new ADOFieldObject();
 182              $fld->name = $rs->fields[0];
 183              $fld->type = $rs->fields[1];
 184              $fld->max_length = $rs->fields[2];
 185              if ($fld->max_length <= 0) $fld->max_length = $rs->fields[3]-4;
 186              if ($fld->max_length <= 0) $fld->max_length = -1;
 187              if ($fld->type == 'numeric') {
 188                  $fld->scale = $fld->max_length & 0xFFFF;
 189                  $fld->max_length >>= 16;
 190              }
 191              // dannym
 192              // 5 hasdefault; 6 num-of-column
 193              $fld->has_default = ($rs->fields[5] == 't');
 194              if ($fld->has_default) {
 195                  $fld->default_value = $rsdefa[$rs->fields[6]];
 196              }
 197  
 198              //Freek
 199              if ($rs->fields[4] == $this->true) {
 200                  $fld->not_null = true;
 201              }
 202              
 203              // Freek
 204              if (is_array($keys)) {
 205                  foreach($keys as $key) {
 206                      if ($fld->name == $key['column_name'] AND $key['primary_key'] == $this->true) 
 207                          $fld->primary_key = true;
 208                      if ($fld->name == $key['column_name'] AND $key['unique_key'] == $this->true) 
 209                          $fld->unique = true; // What name is more compatible?
 210                  }
 211              }
 212              
 213              if ($ADODB_FETCH_MODE == ADODB_FETCH_NUM) $retarr[] = $fld;    
 214              else $retarr[($normalize) ? strtoupper($fld->name) : $fld->name] = $fld;
 215              
 216              $rs->MoveNext();
 217          }
 218          $rs->Close();
 219          if (empty($retarr)) {
 220              $false = false;
 221              return $false;
 222          } else return $retarr;    
 223          
 224      }
 225  
 226  }
 227  
 228  ?>