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>Database error: %s \n", $msg);

printf("ODBC Error: %s (%s) \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(" Debug: query = %s \n", $Query_String);

# rei@netone.com.br 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." ");

# 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 ");

};

$num_rows=$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();