我的php的一个数据库的操纵类

以下是我在工作中常用的一个php中对sql server2000中数据操纵的一个公共odbc操纵类，希望能够给各位初学php的同仁一点点帮助

<?
file://include ("odbc_para.php");
$DbName="localhost";
$DbUser="sa";
$DbPassWord="";//在这里进行定义连接odbc的数据库名，用户名，及密码，实际中以数据库的用户

file://名及密码为标准。

define(C_DB_HOST,$Host);
define(C_DB_NAME,$DbName);
define(C_DB_USER,$DbUser);
define(C_DB_PASS,$DbPassWord);

class Odbc{
    var $Host = C_DB_HOST;   // Hostname of our MySQL server
    var $Database = C_DB_NAME;  // Logical database name on that server
    var $User = C_DB_USER;   // Database user
    var $Password = C_DB_PASS;  // Database user's password
    var $UseODBCCursor = 0;

    var $Link_ID = 0;    // Result of mysql_connect()
    var $Query_ID = 0;    // Result of most recent mysql_query()
    // var $Record = array();                      // Current mysql_fetch_array()-result
    var $Row    = 0;     // Current row number
    var $Errno = 0;     // Error state of query
    var $Error = "";

  var $Auto_Free = 0;     ## set this to 1 to automatically free results

function Halt($msg) {
    printf("</td></tr></table><b>Database error:</b> %s<br>\n", $msg);
    printf("<b>ODBC Error</b>: %s (%s)<br>\n",
      $this->Errno,
      $this->Error);
    die("Session halted.");
  }

function Connect() {
    if ( 0 == $this->Link_ID ) {
      $this->Link_ID=odbc_connect($this->Database, $this->User, $this->Password, $this->UseODBCCursor);
      if (!$this->Link_ID) {
        $this->halt("Link-ID == false, odbc_connect failed");
      }
    }
  }
 
function Close() {
 if (0 != $this->Link_ID){
  odbc_close($this->Link_ID);
 }
}

function Query($Query_String) {
    $this->Connect();
   
#   printf("<br>Debug: query = %s<br>\n", $Query_String);

#   [email protected] suggested that we use this instead of the odbc_exec().
#   He is on NT, connecting to a Unix MySQL server with ODBC. -- KK
#    $this->Query_ID = odbc_prepare($this->Link_ID,$Query_String);
#    $this->Query_Ok = odbc_execute($this->Query_ID);
       
    $this->Query_ID = odbc_exec($this->Link_ID,$Query_String);
    $this->Row = 0;
    file://odbc_binmode($this->Query_ID, 1);
    file://odbc_longreadlen($this->Query_ID, 4096000);
   
    if (!$this->Query_ID) {
      $this->Errno = 1;
      $this->Error = "General Error (The ODBC interface cannot return detailed error messages).";
      $this->halt("Invalid SQL: ".$Query_String);
    }
    return $this->Query_ID;
  }
 
function NextRecord() {
    $this->Record = array();
    $this->$stat = odbc_fetch_into($this->Query_ID,&$this->Record, ++$this->Row);
    if (!$this->$stat) {
      if ($this->Auto_Free) {
 odbc_free_result($this->Query_ID);
        $this->Query_ID = 0;
 };
    } else {
      // add to Record[<key>]
      $count = odbc_num_fields($this->Query_ID);
      for ($i=1; $i<=$count; $i++)
        $this->Record[strtolower(odbc_field_name ($this->Query_ID, $i)) ] = stripslashes($this->Record[ $i - 1 ]);
    }
    return $this->Record;
  }
 
function Seek($pos) {
    $this->Row = $pos;
  }

function MetaData($table) {
    $count = 0;
    $id    = 0;
    $res   = array();

    $this->Connect();
    $id = odbc_exec($this->Link_ID, "select * form $table");
    if (!$id) {
      $this->Errno = 1;
      $this->Error = "General Error (The ODBC interface cannot return detailed error messages).";
      $this->halt("Metadata query failed.");
    }
    $count = odbc_num_fields($id);
   
    for ($i=1; $i<=$count; $i++) {
      $res[$i]["table"] = $table;
      $name             = odbc_field_name ($id, $i);
      $res[$i]["name"]  = $name;
      $res[$i]["type"]  = odbc_field_type ($id, $name);
      $res[$i]["len"]   = 0;  // can we determine the width of this column?
      $res[$i]["flags"] = ""; // any optional flags to report?
    }
   
    odbc_free_result($id);
    return $res;
  }
 

function NumRows() {
    # Many ODBC drivers don't support odbc_num_rows() on SELECT statements.
    $num_rows = odbc_num_rows($this->Query_ID);
 file://printf ($num_rows."<br>");

    # This is a workaround. It is intended to be ugly.
    if ($num_rows < 0) {
      $i=10;
      while (odbc_fetch_row($this->Query_ID, $i))
        $i*=10;

      $j=0;
      while ($i!=$j) {
        $k= $j+intval(($i-$j)/2);
        if (odbc_fetch_row($this->Query_ID, $k))
          $j=$k;
        else
          $i=$k;
        if (($i-$j)==1) {
          if (odbc_fetch_row($this->Query_ID, $i))
            $j=$i;
          else
            $i=$j;
        };
        file://printf("$i $j $k <br>");
      };
      $num_rows=$i;
    }

    return $num_rows;
  }
 

function NumFields() {
    return count($this->Record)/2;
  }
 
function FieldValue($Field_Name){
    return odbc_result($this->Query_ID,$Field_Name);//Record[strtolower($Field_Name)];
  }
 
function AffectedRows() {
    return odbc_num_rows($this->Query_ID);
  } 

}
?>

我的这个操作类是一个odbc接口类。在调用数据操作之前首先需进行odbc的连接，然后再把相应的值付给下面的变量，以便进行操纵：

$DbName="localhost";
$DbUser="sa";
$DbPassWord="";//

假设在odbc连接成功的条件下，对数据库中的表table1进行操作则如下进行：

$db=new Odbc();

$sq1="select * from $table";//选择表中的所有记录

$db->query($sql);

while($result=$db->NextRecrod)

{

echo $result;

}

$db->Close();

.

.

.

 

本文地址：http://com.8s8s.com/it/it28926.htm