[Instance]php the PDO way realizes the database to delete and change to investigate

Collation of the more easily understood PDO Operation example, note that need to open PHP PDO support, php5.1 above version supports the implementation of database connection Singleton, there are three-factor static variables, static instantiation method, private constructor dpdo.php

PDO Operation class//author Http://www.lai18.comclass dpdo{private $DSN;  Private $DBUser;  Private $DBPWD;  Private $longLink;  Private $pdo;    Private constructors prevent direct instantiation of private function __construct ($DSN, $DBUser, $DBPwd, $longLink = False) {$this->dsn = $DSN;    $this->dbuser = $DBUser;    $this->dbpwd = $DBPWD;    $this->longlink = $longLink;  $this->connect (); }//Private null clone function prevents the clone of private function __clone () {}///Static instantiation function returns a PDO object static public function instance ($DSN, $DBUser, $D Bpwd, $longLink = False) {static $singleton = array ();//static function is used to store the instantiated object $singIndex = MD5 ($dsn. $DBUser, $DBPwd. $l    Onglink);    if (Empty ($singleton [$singIndex])) {$singleton [$singIndex] = new self ($dsn, $DBUser, $DBPwd, $longLink = false);  } return $singleton [$singIndex]->pdo; Private Function Connect () {try{if ($this->longlink) {$this->pdo = new PDO ($this->dsn, $this      ->dbuser, $this->dbpwd, array (pdo::attr_persistent = true)); }else{        $this->pdo = new PDO ($this->dsn, $this->dbuser, $this->dbpwd);    } $this->pdo->query (' SET NAMES UTF-8 '); } catch (Pdoexception $e) {die (' Error: '. $e->getmessage ().    ' <br/> '); }  }}

For working with field mappings and using PDO's field mappings, you can effectively avoid SQL injection

field associative array processing, primarily used to write and update data, query conditions with and OR or, generate an array of SQL statements and mapped fields//author http://www.lai18.com public Function Fdfields ($data, $    link = ', ', $judge = Array (), $aliasTable = ') {$sql = ';    $mapData = Array (); foreach ($data as $key = = $value) {$mapIndex = ': '. ($link! = ', '? ' C ': '). $aliasTable.      $key; $sql. = '. ($aliasTable? $aliasTable. ‘.‘ : ‘‘) . "". $key. "". ($judge [$key]? $judge [$key]: ' = '). ‘ ‘ . $mapIndex. ‘ ‘ .      $link;    $mapData [$mapIndex] = $value;    } $sql = Trim ($sql, $link);  Return Array ($sql, $mapData); }//For handling a single field handling public function Fdfield ($field, $value, $judge = ' = ', $preMap = ' cn ', $aliasTable = ') {$mapIndex = ‘:‘ . $preMap. $aliasTable.    $field; $sql = '. ($aliasTable? $aliasTable. ‘.‘ : ‘‘) . "". $field. "". $judge.    $mapIndex;    $mapData [$mapIndex] = $value;  Return Array ($sql, $mapData); }//Using the new method can easily generate query conditions and corresponding data array public function fdcondition ($condition, $mapData) {if (Is_string ($conditioN) {$where = $condition;  } else if (Is_array ($condition)) {if ($condition [' str ']) {if (is_string ($condition [' str '])) {$where        = $condition [' str '];        } else {return false;        }} if (Is_array ($condition [' data ')]) {$link = $condition [' link ']? $condition [' Link ']: ' and ';        List ($CONSQL, $mapConData) = $this->fdfields ($condition [' Data '], $link, $condition [' Judge ']); if ($CONSQL) {$where. = ($where? ‘ ‘ . $link: ").          $CONSQL;        $mapData = Array_merge ($mapData, $mapConData);  }}} return Array ($where, $mapData); }

The concrete realization db.php of adding and deleting and checking

Traversal of the database//author http://www.lai18.compublic function fetch ($sql, $searchData = Array (), $dataMode = Pdo::fetch_assoc, $      Pretype = Array (pdo::attr_cursor = pdo::cursor_fwdonly)) {if ($sql) {$sql. = ' Limit 1 ';      $pdoStatement = $this->pdo->prepare ($sql, $preType);      $pdoStatement->execute ($searchData);    return $data = $pdoStatement->fetch ($dataMode);    } else {return false; }} Public Function Fetchall ($sql, $searchData = Array (), $limit = Array (0, ten), $dataMode = Pdo::fetch_assoc, $preTy PE = Array (pdo::attr_cursor = pdo::cursor_fwdonly)) {if ($sql) {$sql. = ' limit '. (int) $limit [0]. ‘,‘ .      (Intval ($limit [1]) > 0 intval ($limit [1]): 10);      $pdoStatement = $this->pdo->prepare ($sql, $preType);      $pdoStatement->execute ($searchData);    return $data = $pdoStatement->fetchall ($dataMode);    } else {return false; }} Public Function Insert ($tableName, $data, $returnInsertId = False, $repLace = False) {if (!empty ($tableName) && count ($data) > 0) {$sql = $replace?      ' REPLACE into ': ' INSERT into ';      List ($SETSQL, $mapData) = $this->fdfields ($data); $sql. = $tableName. ' Set '.      $SETSQL;      $pdoStatement = $this->pdo->prepare ($sql, array (pdo::attr_cursor = pdo::cursor_fwdonly));      $execRet = $pdoStatement->execute ($mapData); Return $execRet?    ($returnInsertId? $this->pdo->lastinsertid (): $execRet): false;    } else {return false; }} Public Function Update ($tableName, $data, $condition, $mapData = Array (), $returnRowCount = True) {if (!empty ( $tableName) && count ($data) > 0) {$sql = ' UPDATE ' $tableName.      ' SET ';      List ($SETSQL, $mapSetData) = $this->fdfields ($data);      $sql. = $SETSQL;      $mapData = Array_merge ($mapData, $mapSetData);      List ($where, $mapData) = $this->fdcondition ($condition, $mapData); $sql. = $where? ' WHERE '.      $where: "; $pDostatement = $this->pdo->prepare ($sql, array (pdo::attr_cursor = pdo::cursor_fwdonly));      $execRet = $pdoStatement->execute ($mapData); Return $execRet?    ($returnRowCount? $pdoStatement->rowcount (): $execRet): false;    } else {return false; }} Public Function Delete ($tableName, $condition, $mapData = Array ()) {if (!empty ($tableName) && $conditi      ON) {$sql = ' DELETE from '. $tableName;      List ($where, $mapData) = $this->fdcondition ($condition, $mapData); $sql. = $where? ' WHERE '.      $where: ";      $pdoStatement = $this->pdo->prepare ($sql, array (pdo::attr_cursor = pdo::cursor_fwdonly));      $execRet = $pdoStatement->execute ($mapData);    return $execRet; }  }

Test file test.php

PDO operation Class-Test PHP example//author http://www.lai18.comheader ("content-type:text/html; Charset=utf-8 ");d efine (' App_dir ', DirName (__file__)); if (function_exists (' Spl_autoload_register ')) {spl_autoload_register (' Autoclass ');} else {function __auto_load ($  ClassName) {autoclass ($className); }} function Autoclass ($className) {try{require_once app_dir. '/class/'. $className.  PHP '; } catch (Exception $e) {die (' Error: '. $e->getmessage ().  ' <br/> '); }} $DB = new DB ();//Insert $indata[' a '] = rand (1, +), $inData [' b '] = rand (1, +), $inData [' c '] = rand (1,200). ‘.‘ . Rand (1,100); $ret = $DB->insert (' A ', $inData); Echo ' Insert '. ($ret? ' Success ': ' Failure '). ' <br/> ';//Update $upcondata[' a '] =: $upConJudge [' a '] = ' < '; $upConData [' b '] = [] $upConJudge [' b '] = ' > '; list ( $UPCONSTR, $mapUpConData) = $DB->fdfield (' B ', $, ' < ', ' GT '); $condition = Array (' str ' = = $upConStr, ' data ' =& Gt $upConData, ' Judge ' + $upConJudge, ' link ' = ' and '), $upData [' a '] = rand (1, ten); $upData[' b '] = 1; $upData [' c '] = 1.00; $changeRows = $DB->update (' A ', $upData, $condition, $mapUpConData); Echo ' update line number: '. (int) $changeRows. ' <br/> ';//delete $delval = rand (1), List ($delCon, $mapDelCon) = $DB->fdfield (' A ', $delVal); $delRet = $DB Delete (' A ', $delCon, $mapDelCon); Echo ' Delete a= '. $delVal. ($delRet? ' Success ': ' Failure '). ' <br/> '; Query $data[' a '] = ' ten '; $judge [' a '] = ' > '; $data [' b '] = ' + '; $judge [' b '] = ' < '; list ($CONSQL, $mapConData) = $DB->f Dfields ($data, ' and ', $judge); $mData = $DB->fetch (' select * from a where '. $conSql. ' ORDER by ' a ' desc ', $mapConData); Var_dump ($mData);

The above mentioned is the whole content of this article, I hope you can like.

Reference Source:
The method of PDO in PHP to realize the deletion and modification of database
Http://www.lai18.com/content/422492.html

[Instance]php the PDO way realizes the database to delete and change to investigate