Db_mssql_class

详细介绍:
   由于工作的原因，需要对sql server数据库进行操作，根据以前使用的mysql数据库操作类改写成现在这个对sql server进行操作的php类，可以执行连接数据库，执行sql语句，查询数据，获得最后一次插入操作的id号等功能！

/****************************************************************************
            db_mssql_class.php  -  description
                             -------------------
    begin                : 2002 4 2

    $Id: db_mssql_class.php,v 1.1 2002/04/03 09:25:33 Simon.Qiu Exp $
/****************************************************************************/

class DB_Handle{

 var $ClassName = "DB_Handle";
 
 var $Server;
 var $UserName;
 var $Password;
 var $Database;
 
 var $LinkID=0;
 var $QueryResult="";
 var $LastInsertID = "";
 
 /* private ignore=>ignore the error and continue, halt=>report the error and halt, report=>report the error and continue */
 var $Halt_On_Error = "report";
 
 var $Error = "";
 var $ErrNo = 0;
 
 /**public
 *  remark: This is the db_mysql_class's structure
 *  function: Set the server,username,password,database variable.
 */
 function DB_Handle($server="",$username="",$password="",$database=""){
  $this->Server = $server;
  $this->UserName = $username;
  $this->Password = $password;
  $this->Database = $database;
 }
 
   
 /**public
 *  function: Connect database and select database
 *  success: retun 1
 *  failed: return 0 
 */
 function connect(){
  $this->LinkID = @mssql_pconnect($this->Server,$this->UserName,$this->Password);
  if(!$this->LinkID){
   $this->halt("mssql_pconnect($this->Server,$this->UserName,$this->Password): Failed");
   return 0;
  }
  if(!@mssql_select_db($this->Database)){
   $this->halt("mssql_select_db($this->Database) Failed.");
   return 0;
  }
  return 1;
 }
 
 
 /**public
 *  function: Check the database, if exist then select
 *  exist: return 1
 *  not exist: return 0
 */
 function selectDatabase(){
  if(@mssql_select_db($this->Database))
   return 1;
  else
   return 0;
 }

 /**public
 *  function: Execute SQL instruction
 *  success: return SQL Result.
 *  failed: return 0;
 */
 function execQuery($sql=""){
  if($this->LinkID == 0){
   $this->halt("Execute SQL Failed: Hava not valid database connect.");
   return 0;
  }
 
  ob_start();
  $this->QueryResult = mssql_query($sql,$this->LinkID);
  $error = ob_get_contents();
  ob_end_clean();
  if($error){
  
   $this->halt("Execute SQL: mssql_query($sql,$this->LinkID) failed.");
   return 0;
  }
  $reg = "#insert into#";
  if(preg_match($reg,$sql)){
   $sql = "select @@IDENTITY as id";
   $res = mssql_query($sql,$this->LinkID);
   $this->LastInsertID = mssql_result($res,0,id);
  }
  return $this->QueryResult;
 }
 
 
 /**public
 *  function: Get the query result's row number
 *  success: return the row fo the Result
 *  failed: return 0
 */
 function getTotalRowNum($result=""){
  if($result != "") $this->QueryResult = $result;
  $row = @mssql_num_rows($this->QueryResult);
  if($row >= 0) return $row;
  $this->halt("Get a row of result Failed: Result $result is invalid.");
  return 0;
 }
 
 
 /**public
 *  function: Get the last insert record's id
 *  success: return id
 *  failed: return 0
 */
 function lastInsertID(){
  return $this->LastInsertID;
 }
 
 
 /**public
 *  function: Get a field's value
 *  success: return value of the field
 *  failed: return 0
 */
 function getField($result="",$row=0,$field=0){
  if($result != "") $this->QueryResult = $result;
  $fieldvalue = @mssql_result($this->QueryResult,$row,$field);
  if($fieldvalue != "") return $fieldvalue;
  $this->halt("Get field: mssql_result($this->QueryResult,$row,$field) failed.");
  return 0;
 
  //Here should have error handle 
 }
 
 
 /**public
 *  function: Get next record
 *  success: return a array of the record's value
 *  failed: return 0
 */
 function nextRecord($result=""){
  if($result != "") $this->QueryResult = $result;
  $record = @mssql_fetch_array($this->QueryResult);
  if(is_array($record)) return $record;
  //$this->halt("Get the next record Failed: the Result $result is invalid.");
  return 0;
 }
 
 
 /**public
 *  function: Free the Query Result
 *  success return 1
 *  failed: return 0
 */
 function freeResult($result=""){
  if($result != "") $this->QueryResult = $result;
  return @mssql_free_result($this->QueryResult);
 }
 
 
 /**public
 *  function: Set the Halt_On_Error's state
 *  success: return 1
 *  failed: return 0
 */
 function setHaltOnError($state="ignore"){
  if(!($state == "ignore" || $state == "report" || $state == "halt")){
   $this->halt("Set the Halt_On_Error Fail: There is no state value $state");
   return 0;     
  }
  $this->Halt_On_Error = $state;
  return 1;
 }
 
 
 /**public
 *  function: Get the Halt_On_Error's state
 */
 function getHaltOnError(){
  return $this->Halt_On_Error;
 }
 
 
 /**public
 *  function: Get the class's name
 */
 function toString(){
  return $this->ClassName;
 }
 
 
 /**private
 *  function: Error handle
 */
 function halt($msg){
  $this->Error = @mysql_error($this->LinkID);
  $this->ErrNo = @mysql_errno($this->LinkID);
  if ($this->Halt_On_Error == "ignore") return;
  $this->makeMsg($msg);
  if ($this->Halt_On_Error == "halt") die("Session halted");
 }
 
 
 /**private
 *  function: Make error information and print
 */
 function makeMsg($msg){
  printf("Database error: %s
\n", $msg);
  printf("MySQL Error: %s (%s)
\n",$this->ErrNo,$this->Error);
 }
}

?>