PHP连接Oracle数据库类

<?php

putenv("ORACLE_SID=oracle8");
putenv("ORACLE_HOME=/oracle/product/release/8.1.5");

class db_sql {
  var $Debug    =  0;
  var $sqoe     =  1; // sqoe= show query on error

  var $Database = "dev";
  var $User     = "scott";
  var $Password = "tiger";

  var $Link_ID    = 0;
  var $Record    = array();
  var $Row;
  var $numRow;
  var $Parse;
  var $Error     = "";

  function connect() {
      if ( 0 == $this->Link_ID ) {
          if($this->Debug) {
              printf("<br>Connecting to $this->Database...<br>/n");
          }
          $this->Link_ID=OCILogon("$this->User","$this->Password");

          if (!$this->Link_ID) {
              $this->halt("Link-ID == false " .
                          "($this->Link_ID), OCILogon failed");
          }

          if($this->Debug) {
              printf("<br>Obtained the Link_ID: $this->Link_ID<br>/n");
          }
      }
  }

    function query($Query_String) {
      if($Query_String=="")
      {
          echo "执行语句不能为空！";
          return false;
      }
      $this->connect();

      $this->Parse=OCIParse($this->Link_ID,$Query_String);

      if(!$this->Parse) {
           $this->Error=OCIError($this->Parse);
      } else { OCIExecute($this->Parse);
          $this->Error=OCIError($this->Parse);
      }

      $this->Row=0;

      if($this->Debug) {
          printf("Debug: query = %s<br>/n", $Query_String);
      }

      if ($this->Error["code"]!=1403 && $this->Error["code"]!=0 && $this->sqoe)
      echo "<BR><FONT color=red><B>".$this->Error["message"]."<BR>Query :/"$Query_String/"</B></FONT>";
      $numRow=OCIRowCount($this->Parse);
      return $this->Parse;

  }

  function next_record() {
    if(0 == OCIFetchInto($this->Parse,$result,OCI_ASSOC+OCI_RETURN_NULLS)) {
          if ($this->Debug) {
            printf("<br>ID: %d,Rows: %d<br>/n",
              $this->Link_ID,$this->num_rows());
          }
          $this->Row        +=1;

          $errno=OCIError($this->Parse);
          if(1403 == $errno) { # 1043 means no more records found
              $this->Error="";
              $this->disconnect();
              $stat=0;
          } else {
              $this->Error=OCIError($this->Parse);
              if($this->Debug) {
                  printf("<br>Error: %s",
                  $this->Error["message"]);
              }
              $stat=0;
          }
      } else {
          for($ix=1;$ix<=OCINumcols($this->Parse);$ix++) {
              $col=strtoupper(OCIColumnname($this->Parse,$ix));
              $colreturn=strtolower($col);
              $this->Record[ "$colreturn" ] = $result["$col"];
              if($this->Debug) echo"<b>[$col]</b>:".$result["$col"]."<br>/n";
          }
          $stat=1;
      }

  return $stat;
  }
  function record_exist() {
    if(0 == OCIFetchInto($this->Parse,$result)) {
                return 0;
          } else {
                return 1;
      }

  return $stat;
  }

  function seek($pos) {
      $this->Row=$pos;
  }

  function metadata($table,$full=false) {
      $count = 0;
      $id    = 0;
      $res   = array();

    /*
     * Due to compatibility problems with Table we changed the behavior
     * of metadata();
     * depending on $full, metadata returns the following values:
     *
     * - full is false (default):
     * $result[]:
     *   [0]["table"]  table name
     *   [0]["name"]   field name
     *   [0]["type"]   field type
     *   [0]["len"]    field length
     *   [0]["flags"]  field flags ("NOT NULL", "INDEX")
     *   [0]["format"] precision and scale of number (eg. "10,2") or empty
     *   [0]["index"]  name of index (if has one)
     *   [0]["chars"]  number of chars (if any char-type)
     *
     * - full is true
     * $result[]:
     *   ["num_fields"] number of metadata records
     *   [0]["table"]  table name
     *   [0]["name"]   field name
     *   [0]["type"]   field type
     *   [0]["len"]    field length
     *   [0]["flags"]  field flags ("NOT NULL", "INDEX")
     *   [0]["format"] precision and scale of number (eg. "10,2") or empty
     *   [0]["index"]  name of index (if has one)
     *   [0]["chars"]  number of chars (if any char-type)
     *   ["meta"][field name]  index of field named "field name"
     *   The last one is used, if you have a field name, but no index.
     *   Test:  if (isset($result['meta']['myfield'])) {} ...
     */

      $this->connect();

      ## This is a RIGHT OUTER JOIN: "(+)", if you want to see, what
      ## this query results try the following:
      ## $table = new Table; $db = new my_DB_Sql; # you have to make
      ##                                          # your own class
      ## $table->show_results($db->query(see query vvvvvv))
      ##
      $this->query("SELECT T.table_name,T.column_name,T.data_type,".
           "T.data_length,T.data_precision,T.data_scale,T.nullable,".
           "T.char_col_decl_length,I.index_name".
           " FROM ALL_TAB_COLUMNS T,ALL_IND_COLUMNS I".
           " WHERE T.column_name=I.column_name (+)".
           " AND T.table_name=I.table_name (+)".
           " AND T.table_name=UPPER('$table') ORDER BY T.column_id");

      $i=0;
      while ($this->next_record()) {
        $res[$i]["table"] =  $this->Record[table_name];
        $res[$i]["name"]  =  strtolower($this->Record[column_name]);
        $res[$i]["type"]  =  $this->Record[data_type];
        $res[$i]["len"]   =  $this->Record[data_length];
        if ($this->Record[index_name]) $res[$i]["flags"] = "INDEX ";
        $res[$i]["flags"] .= ( $this->Record[nullable] == 'N') ? '' : 'NOT NULL';
        $res[$i]["format"]=  (int)$this->Record[data_precision].",".
                             (int)$this->Record[data_scale];
        if ("0,0"==$res[$i]["format"]) $res[$i]["format"]='';
        $res[$i]["index"] =  $this->Record[index_name];
        $res[$i]["chars"] =  $this->Record[char_col_decl_length];
        if ($full) {
                $j=$res[$i]["name"];
                $res["meta"][$j] = $i;
                $res["meta"][strtoupper($j)] = $i;
        }
        if ($full) $res["meta"][$res[$i]["name"]] = $i;
        $i++;
      }
      if ($full) $res["num_fields"]=$i;
#      $this->disconnect();
      return $res;
  }


  function affected_rows() {
    return OCIRowCount($this->Parse);
  }

  function num_rows() {
          $iii=0;
                while ($this->next_record()) {
                $iii++;
                }
         OCIExecute($this->Parse);
                return $iii;
  }


  function record_rows($tablename,$condition) {
        $this->connect();
        $this->query("select count(*) as countnum from $tablename where ".$condition);
        if ($this->next_record())
             return ($this->Record["countnum"]);
        else
            return 0;
  }

  function num_fields() {
      return OCINumcols($this->Parse);
  }

  function nf() {
    return $this->num_rows();
  }

  function np() {
    print $this->num_rows();
  }

  function f($Name) {
    return $this->Record[$Name];
  }

  function p($Name) {
    print $this->Record[$Name];
  }

  function commit()
  {
    return OCICommit($this->Link_ID);
  }

  function disconnect() {
      if($this->Debug) {
          printf("Disconnecting...<br>/n");
      }
      OCILogoff($this->Link_ID);
  }

  function halt($msg) {
    printf("</td></tr></table><b>Database error:</b> %s<br>/n", $msg);
    printf("<b>ORACLE Error</b>: %s<br>/n",
      $this->Error["message"]);
    die("Session halted.");
  }

  function lock($table, $mode = "write") {
    $this->connect();
    if ($mode == "write") {
      $Parse=OCIParse($this->Link_ID,"lock table $table in row exclusive mode");
      OCIExecute($Parse);
    } else {
      $result = 1;
    }
    return $result;
  }

  function unlock() {
    return $this->query("commit");
  }

  function table_names() {
   $this->connect();
   $this->query("
   SELECT table_name,tablespace_name
     FROM user_tables");
   $i=0;
   while ($this->next_record())
   {
   $info[$i]["table_name"]     =$this->Record["table_name"];
   $info[$i]["tablespace_name"]=$this->Record["tablespace_name"];
   $i++;
   }
  return $info;
  }
}
?>