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PHP PDO common class library example analysis, pdo class library example analysis_PHP tutorial
PHP PDO common class library example analysis, pdo class library example analysis_PHP tutorial
Jul 12, 2016 am 08:54 AM
PHP’s PDO common class library example analysis, pdo class library example analysis
This article describes PHP’s PDO common class library with examples. Share it with everyone for your reference, the details are as follows:
1. Db.class.php connects to the database
<?php
// 連接數(shù)據(jù)庫
class Db {
static public function getDB() {
try {
$pdo = new PDO(DB_DSN, DB_USER, DB_PWD);
$pdo->setAttribute(PDO::ATTR_PERSISTENT, true); // 設(shè)置數(shù)據(jù)庫連接為持久連接
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // 設(shè)置拋出錯(cuò)誤
$pdo->setAttribute(PDO::ATTR_ORACLE_NULLS, true); // 設(shè)置當(dāng)字符串為空轉(zhuǎn)換為 SQL 的 NULL
$pdo->query('SET NAMES utf8'); // 設(shè)置數(shù)據(jù)庫編碼
} catch (PDOException $e) {
exit('數(shù)據(jù)庫連接錯(cuò)誤，錯(cuò)誤信息：'. $e->getMessage());
}
return $pdo;
}
}
?>
2. Model.class.php database operation class
<?php
/**
* 數(shù)據(jù)庫操作類庫
* author Lee.
* Last modify $Date: 2012-1-19 13:59；04 $
*/
class M {
private $_db; //數(shù)據(jù)庫句柄
public $_sql; //SQL語句
/**
* 構(gòu)造方法
*/
public function __construct() {
$this->_db = Db::getDB();
}
/**
* 數(shù)據(jù)庫添加操作
* @param string $tName 表名
* @param array $field 字段數(shù)組
* @param array $val 值數(shù)組
* @param bool $is_lastInsertId 是否返回添加ID
* @return int 默認(rèn)返回成功與否，$is_lastInsertId 為true，返回添加ID
*/
public function insert($tName, $fields, $vals, $is_lastInsertId=FALSE) {
try {
if (!is_array($fields) || !is_array($vals))
exit($this->getError(__FUNCTION__, __LINE__));
$fields = $this->formatArr($fields);
$vals = $this->formatArr($vals, false);
$tName = $this->formatTabName($tName);
$this->_sql = "INSERT INTO {$tName} ({$fields}) VALUES ({$vals})";
if (!$is_lastInsertId) {
$row = $this->_db->exec($this->_sql);
return $row;
} else {
$this->_db->exec($this->_sql);
$lastId = (int)$this->_db->lastInsertId();
return $lastId;
}
} catch (PDOException $e) {
exit($e->getMessage());
}
}
/**
* 數(shù)據(jù)庫修改操作
* @param string $tName 表名
* @param array $field 字段數(shù)組
* @param array $val 值數(shù)組
* @param string $condition 條件
* @return int 受影響的行數(shù)
*/
public function update($tName, $fieldVal, $condition) {
try {
if (!is_array($fieldVal) || !is_string($tName) || !is_string($condition))
exit($this->getError(__FUNCTION__, __LINE__));
$tName = $this->formatTabName($tName);
$upStr = '';
foreach ($fieldVal as $k=>$v) {
$upStr .= '`'.$k . '`=' . '\'' . $v . '\'' . ',';
}
$upStr = rtrim($upStr, ',');
$this->_sql = "UPDATE {$tName} SET {$upStr} WHERE {$condition}";
$row = $this->_db->exec($this->_sql);
return $row;
} catch (PDOException $e) {
exit($e->getMessage());
}
}
/**
* 數(shù)據(jù)庫刪除操作（注：必須添加 where 條件）
* @param string $tName 表名
* @param string $condition 條件
* @return int 受影響的行數(shù)
*/
public function del($tName, $condition) {
try {
if (!is_string($tName) || !is_string($condition))
exit($this->getError(__FUNCTION__, __LINE__));
$tName= $this->formatTabName($tName);
$this->_sql = "DELETE FROM {$tName} WHERE {$condition}";
$row = $this->_db->exec($this->_sql);
return $row;
} catch (PDOException $e) {
exit($e->getMessage());
}
}
/**
* 返回表總個(gè)數(shù)
* @param string $tName 表名
* @param string $condition 條件
* @return int
*/
public function total($tName, $condition='') {
try {
if (!is_string($tName))
exit($this->getError(__FUNCTION__, __LINE__));
$tName = $this->formatTabName($tName);
$this->_sql = "SELECT COUNT(*) AS total FROM {$tName}" .
($condition=='' ? '' : ' WHERE ' . $condition);
$re = $this->_db->query($this->_sql);
foreach ($re as $v) {
$total = $v['total'];
}
return (int)$total;
} catch (PDOException $e) {
exit($e->getMessage());
}
}
/**
* 數(shù)據(jù)庫刪除多條數(shù)據(jù)
* @param string $tName 表名
* @param string $field 依賴字段
* @param array $ids 刪除數(shù)組
* @return int 受影響的行數(shù)
*/
public function delMulti($tName, $field, $ids) {
try {
if (!is_string($tName) || !is_array($ids))
exit($this->getError(__FUNCTION__, __LINE__));
$delStr = '';
$tName = $this->formatTabName($tName);
$field = $this->formatTabName($field);
foreach ($ids as $v) {
$delStr .= $v . ',';
}
$delStr = rtrim($delStr, ',');
$this->_sql = "DELETE FROM {$tName} WHERE {$field} IN ({$delStr})";
$row = $this->_db->exec($this->_sql);
return $row;
} catch (PDOException $e) {
exit($e->getMessage());
}
}
/**
* 獲取表格的最后主鍵（注：針對 INT 類型）
* @param string $tName 表名
* @return int
*/
public function insertId($tName) {
try {
if (!is_string($tName))
exit($this->getError(__FUNCTION__, __LINE__));
$this->_sql = "SHOW TABLE STATUS LIKE '{$tName}'";
$result = $this->_db->query($this->_sql);
$insert_id = 0;
foreach ($result as $v) {
$insert_id = $v['Auto_increment'];
}
return (int)$insert_id;
} catch (PDOException $e) {
exit($e->getMessage());
}
}
/**
* 檢查數(shù)據(jù)是否已經(jīng)存在（依賴條件）
* @param string $tName 表名
* @param string $field 依賴的字段
* @return bool
*/
public function exists($tName, $condition) {
try {
if (!is_string($tName) || !is_string($condition))
exit($this->getError(__FUNCTION__, __LINE__));
$tName = $this->formatTabName($tName);
$this->_sql = "SELECT COUNT(*) AS total FROM {$tName} WHERE {$condition}";
$result = $this->_db->query($this->_sql);
foreach ($result as $v) {
$b = $v['total'];
}
if ($b) {
return true;
} else {
return false;
}
} catch (PDOException $e) {
exit($e->getMessage());
}
}
/**
* 檢查數(shù)據(jù)是否已經(jīng)存在（依賴 INT 主鍵）
* @param string $tName 表名
* @param string $primary 主鍵
* @param int $id 主鍵值
* @return bool
*/
public function existsByPK($tName, $primary, $id) {
try {
if (!is_string($tName) || !is_string($primary)
|| !is_int($id))
exit($this->getError(__FUNCTION__, __LINE__));
$tName = $this->formatTabName($tName);
$this->_sql = "SELECT COUNT(*) AS total FROM {$tName} WHERE {$primary} = ". $id;
$result = $this->_db->query($this->_sql);
foreach ($result as $v) {
$b = $v['total'];
}
if ($b) {
return true;
} else {
return false;
}
} catch (PDOException $e) {
exit($e->getMessage());
}
}
/**
* 預(yù)處理刪除（注：針對主鍵為 INT 類型，推薦使用）
* @param string $tName 表名
* @param string $primary 主鍵字段
* @param int or array or string $ids 如果是刪除一條為 INT，多條為 array，刪除一個(gè)范圍為 string
* @return int 返回受影響的行數(shù)
*/
public function delByPK($tName, $primary, $ids, $mult=FALSE) {
try {
if (!is_string($tName) || !is_string($primary)
|| (!is_int($ids) && !is_array($ids) && !is_string($ids))
|| !is_bool($mult)) exit($this->getError(__FUNCTION__, __LINE__));
$tName = $this->formatTabName($tName);
$stmt = $this->_db->prepare("DELETE FROM {$tName} WHERE {$primary}=?");
if (!$mult) {
$stmt->bindParam(1, $ids);
$row = $stmt->execute();
} else {
if (is_array($ids)) {
$row = 0;
foreach ($ids as $v) {
$stmt->bindParam(1, $v);
if ($stmt->execute()) {
$row++;
}
}
} elseif (is_string($ids)) {
if (!strpos($ids, '-'))
exit($this->getError(__FUNCTION__, __LINE__));
$split = explode('-', $ids);
if (count($split)!=2 || $split[0]>$split[1])
exit($this->getError(__FUNCTION__, __LINE__));
$i = null;
$count = $split[1]-$split[0]+1;
for ($i=0; $i<$count; $i++) {
$idArr[$i] = $split[0]++;
}
$idStr = '';
foreach ($idArr as $id) {
$idStr .= $id . ',';
}
$idStr = rtrim($idStr, ',');
$this->_sql ="DELETE FROM {$tName} WHERE {$primary} in ({$idStr})";
$row = $this->_db->exec($this->_sql);
}
}
return $row;
} catch (PDOException $e) {
exit($e->getMessage());
}
}
/**
* 返回單個(gè)字段數(shù)據(jù)或單條記錄
* @param string $tName 表名
* @param string $condition 條件
* @param string or array $fields 返回的字段，默認(rèn)是*
* @return string || array
*/
public function getRow($tName, $condition='', $fields="*") {
try {
if (!is_string($tName) || !is_string($condition)
|| !is_string($fields) || empty($fields))
exit($this->getError(__FUNCTION__, __LINE__));
$tName = $this->formatTabName($tName);
$this->_sql = "SELECT {$fields} FROM {$tName} ";
$this->_sql .= ($condition=='' ? '' : "WHERE {$condition}") . " LIMIT 1";
$sth = $this->_db->prepare($this->_sql);
$sth->execute();
$result = $sth->fetch(PDO::FETCH_ASSOC);
if ($fields === '*') {
return $result;
} else {
return $result[$fields];
}
} catch (PDOException $e) {
exit($e->getMessage());
}
}
/**
* 返回多條數(shù)據(jù)
* @param string $tName 表名
* @param string $fields 返回字段，默認(rèn)為*
* @param string $condition 條件
* @param string $order 排序
* @param string $limit 顯示個(gè)數(shù)
* @return PDOStatement
*/
public function getAll($tName, $fields='*', $condition='', $order='', $limit='') {
try {
if (!is_string($tName) || !is_string($fields)
|| !is_string($condition) || !is_string($order)
|| !is_string($limit))
exit($this->getError(__FUNCTION__, __LINE__));
$tName = $this->formatTabName($tName);
$fields = ($fields=='*' || $fields=='') ? '*' : $fields;
$condition = $condition=='' ? '' : " WHERE ". $condition ;
$order = $order=='' ? '' : " ORDER BY ". $order;
$limit = $limit=='' ? '' : " LIMIT ". $limit;
$this->_sql = "SELECT {$fields} FROM {$tName} {$condition} {$order} {$limit}";
$sth = $this->_db->prepare($this->_sql);
$sth->execute();
$result = $sth->fetchAll(PDO::FETCH_ASSOC);
return $result;
} catch (PDOException $e) {
exit($e->getMessage());
}
}
/**
* 格式化數(shù)組（表結(jié)構(gòu)和值）
* @param array $field
* @param bool $isField
* @return string
*/
private function formatArr($field, $isField=TRUE) {
if (!is_array($field)) exit($this->getError(__FUNCTION__, __LINE__));
$fields = '';
if ($isField) {
foreach ($field as $v) {
$fields .= '`'.$v.'`,';
}
} else {
foreach ($field as $v) {
$fields .= '\''.$v.'\''.',';
}
}
$fields = rtrim($fields, ',');
return $fields;
}
/**
* 格式化問號
* @param int $count 數(shù)量
* @return string 返回格式化后的字符串
*/
private function formatMark($count) {
$str = '';
if (!is_int($count)) exit($this->getError(__FUNCTION__, __LINE__));
if ($count==1) return '?';
for ($i=0; $i<$count; $i++) {
$str .= '?,';
}
return rtrim($str, ',');
}
/**
* 錯(cuò)誤提示
* @param string $fun
* @return string
*/
private function getError($fun, $line) {
return __CLASS__ . '->' . $fun . '() line<font color="red">'. $line .'</font> ERROR!';
}
/**
* 處理表名
* @param string $tName
* @return string
*/
private function formatTabName($tName) {
return '`' . trim($tName, '`') . '`';
}
/**
* 析構(gòu)方法
*/
public function __destruct() {
$this->_db = null;
}
}
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