使用php怎么編寫一個mysql數據庫操作類

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復制代碼 代碼如下:

<?php
/*
數據庫操作類
*/
class Mysql{
 private $LocalHost = 'localhost';
 private $LoaclUser = 'root';
 private $LocalPass = '123456';
 private $LocalBase = 'jiangxibaiyi';
 private $LocalCode = 'UTF8';
 private $PreFix;
 private $Conn;
 private $Start     = 0;
 private $Error     = false; //數據庫連接狀態, false表示未連接或連接不正常
 public  $Err       = true;  //Sql執行結果

 private $Table;
 private $Field     = '*';
 private $Where     = '';
 private $Order     = '';

 private $PageSize  = 0; //分頁顯示->每頁多少條，0為不分頁顯示
 private $PageCount = 1; //分頁顯示->總共有多少條
 private $PageNum   = 1; //分頁顯示->總共有多少頁
 private $PageNo    = 1; //分頁顯示->當前第幾頁
 private $PageKey   = 'page'; //分頁url參數鍵
 private $PageStart = 0; //分頁顯示->當前從第幾條開始返回

 
 private $Select;
 private $Rest;

 private $Result    = false;//結果集

 public $FormArray = array();

 public $Instr_ID  = 0;
 private $j =  0;

 
 public function Parameter($Loca, $Root, $Pass, $Base, $Code, $PreFix = ''){
  $this->LoaclUser = $Root;
  $this->LocalBase = $Base;
  $this->LocalCode = $Code;
  $this->LocalHost = $Loca;
  $this->LocalPass = $Pass;
  $this->PreFix    = $PreFix;
  return $this;
 }
 private function Connection( $Sql ){
  !function_exists(mysqli_connect) ? die('查詢失敗，無法加載mysqli擴展') : null;
  $this->Conn = @new mysqli( $this->LocalHost, $this->LoaclUser, $this->LocalPass, $this->LocalBase);
  $this->Error = mysqli_connect_errno() == 0 ? true : false;
  !$this->Error ? die('數據庫連接錯誤，請檢查數據庫連接參數') : null;
  $this->Conn->query('SET NAMES ' . $this->LocalCode);
  $this->Rest = $this->Conn->query($Sql);
  $this->Err  = mysqli_error($this->Conn);
  $this->Instr_ID = mysqli_insert_id($this->Conn);
  $this->Rest->free_result;
  $this->Conn->close;
  $this -> FormArray = '';
  return $this;
 }

 public function null(){
  $this->PageSize  = 0;
  //$this->PageCount = 1;
  $this->PageStart = 1;
  $this->Field     = ' * ';
     $this->Select    = '';
  unset($this->Table, $this->Where,$this->Order, $this->Result);
 }

 public function Table( $TableName ) {//數據表
   $this -> null();
   $this->Table = '`' . $this->PreFix . $TableName . '`';
   return $this;
 }

 public function Field( $Array = '*' ) {//數據字段
   !empty( $this->Field ) ? $this->Field = '' : null;
   $Array = explode(',', $Array);
   foreach ( $Array as $field ) {
   $this->Field .= !$this->Start ? '`' . $field . '`' :  ', `' . $field . '`';
   $this->Start++;
   }
   $this->Start = 0;
   return $this;
 }

 public function Where( $Where ) {//條件
       $this->Where = ' where ' .$Where;
    return $this;
 }

 public function Order( $Order ) {//排序
   $this->Order = ' order by ' . $Order;
   return $this;
 }

 public function pk( $key ) {//分頁url參數鍵
   $this->PageKey = $key;
   return $this;
 }

 public function Page( $PageSize ) {//分頁
   $this->PageSize = $PageSize;
   $this->PageNo   = $this->get( $this->PageKey );
   $this->PageNo   = empty( $this->PageNo ) || !isset( $this->PageNo ) || !is_numeric( $this->PageNo ) || $this->PageNo < 1 ? 1 : $this->PageNo;
   return $this;
 }

 public function post( $Key, $Filter = true ){
  return $Filter ? strip_tags($_POST[$Key]) : $_POST[$Key];
 }

 public function get( $Key, $Filter = true ){
  return $Filter ? strip_tags($_GET[$Key]) : $_GET[$Key];
 }

 public function Sel(){
  $this->Select = 'Select ' . $this->Field . ' from ' . $this->Table . $this->Where . $this->Order;
  $this->Connection( $this->Select );
  if ( $this->Rest->num_rows ) {
   while ( $Rs = $this->Rest->fetch_assoc() ) {
     $this->Result[] = $Rs;
    }
  }
    $DataBase = $this->Result;
    return empty($DataBase) ? false : $DataBase;
 }

 public function querys( $Sql = '', $Type = 'not', $biao = false ) {
  $this->Select = $Sql;
  $this->Connection( $this->Select );
  if ( $this->Rest->num_rows ) {
     if ( !$biao ) {
   while ( $Rs = $this->Rest->fetch_array() ) {
     $this->Result[] = !preg_match('/^\d+$/i', $Type) ?  $Rs : $Rs[ $Type ];
    }
  } else {
   while ( $Rs = $this->Rest->fetch_assoc() ) {
     $this->Result[] = $Rs;
    }
  }
  }
    $DataBase = $this->Result;
    return empty($DataBase) ? false : $DataBase;

 }

 public function executes( $Sql = '' ){
  $this->Connection( $Sql  );
  return $this->Rest;
 }

 
 public function exists( $T = '', $F = '', $W = ''){
  if ( empty( $F ) ) { return 0; }
  $cmd = empty( $W ) ? 'Select sum(' . $F . ') as `baiyinum` from `' . $this->PreFix . $T .'`' : 'Select sum(' . $F . ') as `baiyinum` from `' . $this->PreFix . $T .'` Where ' . $W;
        $this->Connection( $cmd );
  unset( $T, $F, $W, $cmd );
  $Rel =  $this->Rest->fetch_array();
  return round( $Rel['baiyinum'], 2 );
 }

 
 public function ExistsTo( $Bili = 10000, $T = '', $F = '', $W = ''){
  if ( empty( $F ) ) { return 0; }
  $cmd = empty( $W ) ? 'Select sum(' . $F . ') as `baiyinum` from `' . $this->PreFix . $T .'`' : 'Select sum(' . $F . ') as `baiyinum` from `' . $this->PreFix . $T .'` Where ' . $W;
        $this->Connection( $cmd );
  unset( $T, $F, $W, $cmd );
  $Rel =  $this->Rest->fetch_array();
  return round( $Rel['baiyinum'] * $Bili );
 }

 
 public function Select( $Type = true, $ListNum = 1 ){ //返回記錄（數組形式， 返回條數）
   $this->Select = 'Select ' . $this->Field . ' from ' . $this->Table . $this->Where . $this->Order;
   if ( is_numeric( $ListNum ) ) {
  if ( $this->PageSize > 0 ) {
   $this->Connection( $this->Select );//執行查詢
   $this->PageCount =  $this->Rest->num_rows;//取得記錄總數
   $this->PageNum   =  ceil($this->PageCount / $this->PageSize); //總共有多少頁
   $this->PageNo    = $this->PageNo > $this->PageNum ? $this->PageNum : $this->PageNo;
   $this->PageStart = ( $this->PageNo - 1 ) * $this->PageSize;   //當前從第幾條開始返回
   $this->Select   .= ' limit ' . $this->PageStart . ', ' .$this->PageSize; //重新構造sql語句
  } else {
   $this->Select   .= ' limit ' . $ListNum; //重新構造sql語句
  }
   } else {
   $this->Select   .= ' limit 1'; //重新構造sql語句
   }
   //echo $this->Select;
   $this->Connection( $this->Select );//再次執行查詢
   if ( $this->Rest->num_rows ) {//如果記錄存在
  if ( $Type ) {
    while ( $Rs = $this->Rest->fetch_array() ) {
     $this->Result[] = $Rs;
    }
  }else{
    while ( $Rs = $this->Rest->fetch_assoc() ) {
     $this->Result[] = $Rs;
    }
  }
   }
   if ( ( $ListNum == 1 or !is_numeric( $ListNum ) ) && !$this->PageSize) { $this->Result = $this->Result[0]; }
   $DataBase = $this->Result;
   return empty($DataBase) ? false : $DataBase;
 }

   public function Num() { //返回記錄總數
     $this->Select = 'Select ' . $this->Field . ' from ' . $this->Table . $this->Where . $this->Order;
  $this->Connection( $this->Select );//執行查詢
  return $this->Rest->num_rows;//取得記錄總數
   }

   public function PageNav($NumNav = false ) {  //分頁
  $Action = $this -> get('action');
  !empty( $Action ) or $Action =  'index';
  $Module = $this -> get('module');
  !empty( $Module ) or $Module = 'index';
  $NavUrl   = '/' . $Module . '/' . $Action . '/' . $this -> PageKey .'/';
  $NaIndex  = '/' . $Module . '/' . $Action;
  $PageHtml = "\n<div class=\"pagenav\">";
  $PageHtml .= '<span>' . $this->PageCount . '條記錄        ' . $this->PageNo . '/' . $this->PageNum . '頁</span>            ';
  $this->PageNo <= 1 or $PageHtml .= "<a href=\"" . $NaIndex . "\">首頁</a>\n<a href=\"" .  $NavUrl . ($this->PageNo - 1) . "\">上一頁</a>\n";
 if ( $NumNav ) { $PageHtml .= $this->NumPage($NavUrl); }
 $this->PageNo >= $this->PageNum or $PageHtml .= "<a href=\"" . $NavUrl. ($this->PageNo + 1) .  "\">下一頁</a>\n<a href=\"" . $NavUrl . $this->PageNum . "\">尾頁</a>\n";
 $PageHtml .= "</div>\n";
 return  $PageHtml;
   }

   private function NumPage( $Can = '' ) { //數字分頁
    $NumHtml = '';
    $First   = 1;
    $Last    = $this->PageNum;
    if ( $this->PageNum > 5 ) {
     if ( $this->PageNo < $this->PageNum ) {
     $First = $this->PageNo - 2;
     $Last  = $this->PageNo + 2;
     }else{
     $First = $this->PageNo - 4;
     $Last  = $this->PageNum;
     }
    }
    if ( $First < 1 ) { $First   = 1; $Last = $First + 4;}
    if ( $Last  > $this->PageNum ) { $First   = $this->PageNum - 4; $Last = $this->PageNum;}
    for( $i = $First; $i <= $Last; $i++) {
     $NumHtml .= $this->PageNo != $i ? "\n\t" . '<a href="' . $Can . $i . '">' . $i . '</a>' . "\n\t" : "\n\t" .'<a class="hover" disabled="disabled">' . $i . '</a>' . "\n\t";
    }
    unset($Can, $First, $i, $Last);
    return $NumHtml;
   }

   public function UserPage($NumNav = false, $PageName = 'index', $Mulu = 'user' ) {  //會員中心分頁
     $NavUrl   = '/' . $Mulu . '/' . $PageName . '/' . $this->PageKey . '/';
  $PageHtml = "\n<div class=\"pagenav\">";
  $PageHtml .= '<span>' . $this->PageCount . '條記錄        ' . $this->PageNo . '/' . $this->PageNum . '頁</span>            ';
  $this->PageNo <= 1 or $PageHtml .= "<a href=\"" . $NavUrl . "1\">首頁</a>\n<a href=\"" .  $NavUrl . ($this->PageNo - 1) . "\">上一頁</a>\n";
 if ( $NumNav ) { $PageHtml .= $this->NumPage($NavUrl); }
 $this->PageNo >= $this->PageNum or $PageHtml .= "<a href=\"" . $NavUrl. ($this->PageNo + 1) .  "\">下一頁</a>\n<a href=\"" . $NavUrl . $this->PageNum . "\">尾頁</a>\n";
 $PageHtml .= "</div><div class=\"clear\"></div>\n";
 return  $PageHtml;
   }

  
   //表單處理開始

 //判斷表單時候提交
 public function FormIs( $Keys = 'mm' ) {
  return $_POST[ $Keys ] == 1 ? true : false;
 }

 //post方式獲取數據
 public function _post( $Keys = '', $TiHuan = '') {
  $Values = strip_tags( $_POST[ $Keys ] );
  $this->FormArray[$Keys] = empty( $Values ) ? $TiHuan : $Values;
        return  empty( $Values ) ? $TiHuan : $Values;
 }

 //get方法獲取數據
 public function _get( $Keys = '', $TiHuan = '') {
  $Values = strip_tags( $_GET[ $Keys ] );
        return  empty( $Values ) ? $TiHuan : $Values;
 }

 //判斷是否為數字并且不小于0
 public function IsNum( $Num = 0, $Mesg = '參數必須為數字' ) {
  if ( is_numeric( $Num ) && !empty( $Num ) && $Num >= 0 ) {
   return $Num;
  }else{
   die( $Mesg );
  }
 }

 //判斷是否為數字并且不小于0返回True/False
 public function NumBer( $Num = 0) {
   return  is_numeric( $Num ) && !empty( $Num ) && $Num >= 0 ? true : false;
 }

 //檢測相關數據似乎存在
 public function IsData($Types = true, $memg = '數據已經存在' ){
  $this->Connection('select ' . $this->Field . ' from ' . $this->Table . $this->Where);
  if ( $Types ){
   $this->Rest->num_rows > 0 ? die( $memg ) : null;
  } else {
   return $this->Rest->num_rows;
  }
 }

 
 //寫入數據庫記錄
 public function into( $Mesg = '' ){
  !is_array( $this->FormArray ) ? die( $Mesg ) : null;
  $Sql = 'insert into ' . $this->Table . ' (`';
  $I   = 0;
  foreach ( $this->FormArray as $Key => $Val ){
   $Duan .= !$I ? $Key . '`' : ', `' . $Key . '`';
   if ( is_numeric( $Val ) ){
    $Vals .= !$I ? $Val : ', ' . $Val;
   }else{
    $Vals .= !$I ? '\'' . $Val . '\'' : ', \'' . $Val . '\'';
   }
   $I++;
  }
  $Sql .= $Duan . ') values (' . $Vals . ')';

  //@file_put_contents('1.sql', $Sql, FILE_APPEND);

  $this->Connection( $Sql );
  return !empty( $this->Err ) ? false : true;
 }

   //數組形式寫入數據
   public function MsgBox( $Table = '', $Filed = array() ) {
    $this -> Table($Table);
    foreach( $Filed as $Key => $Val ) {
    $this -> FormArray[ $Key ] = $Val;
    }
   return $this ->  Into('未取得數據');
   }

   //修改數據庫記錄
   public function Edit( $Array = array() ) {
    if ( empty( $Array ) ) { $Array = $this -> FormArray; }
    if ( !is_array( $Array ) || empty( $Array ) ) {
     return false;
    } else {
       $Sql = 'update ' . $this -> Table . ' set ';
    $I   = 0;
    $Sub = '';
    $Huan = array('-' => '[jian]', '+' => '[jia]', '*' => '[cheng]', '/' => '[chu]');
    $Zhan = array('[jian]' => '-', '[jia]' => '+', '[cheng]' => '*', '[chu]' => '/');

    foreach ( $Array as $Files => $Val ) {
     $Val  = !is_numeric( $Val ) && !preg_match('/\`\w+\`\s*(\+|\-|\*|\/)/i', $Val) ? '\'' . $Val . '\'' : $Val;
     foreach ( $Huan as $key => $val ){
      $Val = str_replace($key, $val, $Val);
     }
     $duan = !$I ? '`' . $Files . '` = ' :  ', `' . $Files . '` = ';
     $Sub .= $duan . $Val;
     $I++;
    }
    $Sql .= $Sub . $this -> Where;
    foreach ( $Zhan as $Fan => $Hui ) {
     $Sql = str_replace($Fan, $Hui, $Sql);
    }

    //echo $Sql; die;

    $this -> Connection( $Sql );
    unset( $Array, $duan, $Fan, $Files, $Huan, $Hui, $I, $key, $Sql, $Sub, $Val, $Zhan, $val );
    return !empty( $this -> Err ) ? false : true;
   }
   }

   //刪除數據庫記錄
   public function del(){
    $Sql = 'delete from ' . $this->Table . $this->Where;
    $this->Connection( $Sql );
    unset($Sql);
    return !empty( $this->Err ) ? false : true;
   }

   //表單處理結束

   //頁面跳轉
   public function Msg( $Text = '操作成功' ) {
    echo '<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />';
    echo '<script type="text/javascript">
  <!--
    alert("' . $Text . '");
 document.location="' . $_SERVER['HTTP_REFERER'] . '";
  //-->  
</script>';
 exit;
   }

   #取得系統當前時間
   public function Times(){
    return str_replace('-', '[jian]', date('Y-m-d H:i:s'));
   }

   #取得用戶IP地址
 public function GetIP(){
   if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
    $ip = getenv("HTTP_CLIENT_IP");
  else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
    $ip = getenv("HTTP_X_FORWARDED_FOR");
  else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
    $ip = getenv("REMOTE_ADDR");
  else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
    $ip = $_SERVER['REMOTE_ADDR'];
  else
    $ip = "unknown";
   return($ip);
 }

  
   //最后關閉數據庫連接
   public function Close(){
    !is_object( $this -> Conn ) or mysqli_close( $this -> Conn );
   }

}

使用方法：
聲明數據庫對象
$Conn = new Mysql;
加載數據庫參數
$Conn->Parameter(數據庫服務器, 數據庫用戶名, 數據庫密碼, 數據庫名稱, 數據庫編碼, 數據庫表前綴[可為空]);

上面的代碼就已經加載這個類文件進來了，并且初始化了一些數據庫連接參數！

下面介紹幾個基本是方法函數：
1、 $Conn -> Table();
選擇數據表，參數是數據表名稱
2、$Conn -> Field();
選擇的字段名稱，多個用逗號隔開，如不調用這個方法，則返回全部
3、$Conn -> Where();
Sql Where子語句，根據條件篩選
4、$Conn -> Order();
Sql 排序
5、$Conn -> Page(int);
參數是一個正整數數字，如調用這個方法，記錄將分頁顯示
6、$Conn -> Select(布爾值);
執行查詢，返回查詢結果，如果有，則是一個二維數組，如果無，則返回假，參數可省略，如省略，默認為真，返回的數組包含數字元素
7、$Conn -> Del();
刪除記錄
8、 $Conn -> Edit(array());
修改記錄，參數是一個一維數組，數組鍵是字段名稱，數組值是字段值
9、$Conn -> Into(array());
添加記錄，參數是一個一維數組，數組鍵是字段名稱，數組值是字段值。

以上方法可連續調用，比如：

復制代碼 代碼如下:

$Rult = $Conn -> Table('user') -> Select(); //查詢返回user表的所有記錄
$Rult = $Conn -> Table('user') -> Page(20) -> Select();//查詢返回user表的所有記錄，并分頁顯示，每頁20條；

關于使用php怎么編寫一個mysql數據庫操作類就分享到這里了，希望以上內容可以對大家有一定的幫助，可以學到更多知識。如果覺得文章不錯，可以把它分享出去讓更多的人看到。