<!--?php
/**
+----------------------------------
* MySQL操作类库
+----------------------------------
* @author 马犇 <www.imaben.com-->
+----------------------------------
* @version 1.2 (2013-5-31)
+----------------------------------
*/
include (dirname(__FILE__) . DIRECTORY_SEPARATOR . ‘config.php‘);
define(‘CLIENT_MULTI_RESULTS‘, 131072);
class mysql {
/* 主机地址 */
private $Host = ‘127.0.0.1‘;
/* 数据库名称 */
private $dbName = DB_NAME;
/* 用户名 */
private $UserName = DB_USER;
/* 连接密码 */
private $Password = DB_PWD;
/* 数据库编码 */
private $dbCharSet = ‘utf8‘;
/* 错误信息 */
private $errorMsg;
/* 最后一次执行的SQL */
private $lastSql;
/* 字段信息 */
private $fields = array();
/* 最后一次插入的ID */
public $lastInsID = null;
/* 数据库连接ID */
private $linkID = 0;
/* 当前查询ID */
private $queryID = null;
/*主键*/
private $pk = null;
public function __construct($DBName = ‘‘) {
if ($DBName != ‘‘)
$this->dbName = $DBName;
$this->connect();
}
/**
+----------------------------------------------------------
* 连接数据库方法
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function connect() {
if ($this->linkID == 0) {
$this->linkID = mysql_connect($this->Host, $this->UserName, $this->Password, true, CLIENT_MULTI_RESULTS);
if (!$this->linkID) {
$this->errorMsg = ‘数据库连接错误\r\n‘ . mysql_error();
$this->halt();
}
}
if (!mysql_select_db($this->dbName, $this->linkID)) {
$this->errorMsg = ‘打开数据库失败‘ . mysql_error($this->linkID);
$this->halt(‘打开数据库失败‘);
}
$dbVersion = mysql_get_server_info($this->linkID);
if ($dbVersion >= "4.1") {
//使用UTF8存取数据库 需要mysql 4.1.0以上支持
mysql_query("SET NAMES ‘" . $this->dbCharSet . "‘", $this->linkID);
}
//设置CharSet
mysql_query(‘set character set \‘‘ . $this->dbCharSet . ‘\‘‘, $this->linkID);
//设置 sql_model
if ($dbVersion > ‘5.0.1‘) {
mysql_query("SET sql_mode=‘‘", $this->linkID);
}
}
/**
+----------------------------------------------------------
* 释放查询结果
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function free() {
if($this->queryID != null)
mysql_free_result($this->queryID);
$this->queryID = null;
}
/**
+----------------------------------------------------------
* 执行语句
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $sql sql指令
+----------------------------------------------------------
* @return bool or resource
+----------------------------------------------------------
*/
public function execute($sql) {
if ($this->linkID == 0)
$this->connect();
$this->lastSql = $sql;
$this->queryID = mysql_query($sql);
if (false == $this->queryID) {
$this->errorMsg = ‘SQL语句执行失败\r\n‘ . mysql_error($this->linkID);
return false;
} else {
return $this->queryID;
}
}
/**
+----------------------------------------------------------
* 获取记录集的行数
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $sql sql指令 可为空
* 如为空：返回上一结果集记录数
* 如不为空：返回当前sql语句的记录数
+----------------------------------------------------------
* @return integer
+----------------------------------------------------------
*/
public function getRowsNum($sql = ‘‘) {
if ($this->linkID == 0) {
$this->connect();
}
if ($sql != ‘‘) {
$this->execute($sql);
}
return mysql_num_rows($this->queryID);
}
/**
+----------------------------------------------------------
* 表单数据直接插入到数据表中
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $tableName 数据表名
+----------------------------------------------------------
* @return 执行成功返回插入记录的索引记录，失败返回false
+----------------------------------------------------------
*/
public function form2db($tableName) {
$_POST["add_time"] = date(‘Y-m-d H:i:s‘);
$data = $_POST;
$this->fields = $this->getFields($tableName);
$data = $this->_facade($data);
if ($this->insert($tableName, $data)) {
return $this->lastInsID;
} else {
return false;
}
}
/**
+----------------------------------------------------------
* 数据直接插入到数据表中
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $tableName 数据表名
+----------------------------------------------------------
* @param array $data 插入的数据 数据键名对应字段名，键值对应值
+----------------------------------------------------------
* @return boolean
+----------------------------------------------------------
*/
public function insert($tableName, $data) {
$values = $fields = array();
foreach ($data as $key => $val) {
$value = ‘\‘‘ . addslashes($val) . ‘\‘‘;
if (is_scalar($value)) { // 过滤非标量数据
$values[] = $value;
$fields[] = $key;
}
}
$sql = ‘INSERT INTO ‘ . trim($tableName) . ‘(‘ . implode(‘,‘, $fields) . ‘) VALUES(‘ . implode(‘,‘, $values) . ‘)‘;
if ($this->execute($sql)) {
$this->errorMsg = ‘插入失败\r\n‘ . mysql_error($this->linkID);
$this->lastInsID = mysql_insert_id($this->linkID);
return true;
} else {
return false;
}
}
/**
+----------------------------------------------------------
* 更新操作
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $tableName 数据表名
+----------------------------------------------------------
* @param array $data 插入的数据 数据键名对应字段名，键值对应值
+----------------------------------------------------------
* @param array $condition 更新条件，为安全起见，不能为空
+----------------------------------------------------------
* @param array $isForm 可为空，缺省为true
* 如果为true，会当成表单更新数据表来处理，自动映射字段
* 如果为false，会当成普通的更新来处理，不会自动映射字段
+----------------------------------------------------------
* @return boolean
+----------------------------------------------------------
*/
public function update($tableName, $data, $condition, $isForm = true) {
if (empty($condition)) {
$this->errorMsg = ‘没有设置更新条件‘;
return false;
}
//处理分解condition
if(is_array($condition)){
$condition = self::_parseCondition($condition);
}
if ($isForm) {
$this->fields = $this->getFields($tableName);
$data = $this->_facade($data);
}
$sql = ‘UPDATE ‘ . trim($tableName) . ‘ SET ‘;
foreach ($data as $key => $val) {
$sql .= $key . ‘=\‘‘ . $val . ‘\‘,‘;
}
$sql = substr($sql, 0, strlen($sql) - 1);
$sql .= ‘ WHERE ‘ . $condition;
if ($this->execute($sql)) {
return true;
} else {
$this->errorMsg = ‘更新失败\r\n‘ . mysql_error($this->linkID);
return false;
}
}
/**
+----------------------------------------------------------
* 删除操作
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $tableName 数据表名
+----------------------------------------------------------
* @param array $condition 更新条件，为安全起见，不能为空
+----------------------------------------------------------
* @return boolean
+----------------------------------------------------------
*/
public function delete($tableName, $condition) {
//处理分解condition
if(is_array($condition)){
$condition = self::_parseCondition($condition);
}
$sql = ‘delete from ‘ . $tableName . ‘ where 1=1 and ‘ . $condition;
if (!$this->execute($sql))
return false;
return true;
}
/**
+----------------------------------------------------------
* 利用__call魔术方法实现一些特殊的Model方法
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $method 方法名称
* @param array $args 调用参数
+----------------------------------------------------------
* @return mixed
+----------------------------------------------------------
*/
public function __call($method,$args){
/*根据某个字段获取记录字段的值
* 例1：getFieldByid(student_info,100,name)---获取学生表中id为100的学生姓名
* 例2：getFieldByxh(student_info,201215030223,address)---获取学生表中学号为201015030223的地址
* 注："getFieldBy"不区分大小写，后面的字段名区分大小写
* 返回值：string
*/
if(strtolower(substr($method,0,10)) == ‘getfieldby‘){
$name = substr($method,10);
$sql = ‘select `‘.$args[2].‘` from ‘.$args[0].‘ where ‘.$name.‘=\‘‘.$args[1].‘\‘‘;
if($this->execute($sql)){
$row = mysql_fetch_array($this->queryID);
return $row[0];
}else{
return false;
}
}
/*根据某个字段和值获取某条记录
* 例1：getByid(student_info,100)---获取学生表中id为100的学生信息
* 例2：getByxh(student_info,201215030223)---获取学生表中学号为201015030223的学生信息
* 注："getBy"不区分大小写，后面的字段名区分大小写
* 返回值：array
*/
elseif(strtolower(substr($method,0,5)) == ‘getby‘){
$ret = array();
$name = substr($method,5);
$sql = ‘select * from ‘.$args[0].‘ where ‘.$name.‘=\‘‘.$args[1].‘\‘‘;
if($this->execute($sql)){
$row = mysql_fetch_array($this->queryID);
return $row;
}else{
return false;
}
}
}
/**
+----------------------------------------------------------
* 弹出错误提示，并终止运行
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $msg 错误消息，可为空
+----------------------------------------------------------
*/
public static function halt($msg = ‘‘) {
if ($msg != ‘‘) {
$msg .= ‘\r\n‘;
}
$error = mysql_error();
die($msg);
}
/**
+----------------------------------------------------------
* 获取最后一次查询ID
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function getQueryId(){
return $this->queryID;
}
/**
+----------------------------------------------------------
* 获取最后一次数据库操作错误信息
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function getLastError() {
return $this->errorMsg;
}
/**
+----------------------------------------------------------
* 获取最后一次执行的SQL语句
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function getLastSql() {
return $this->lastSql;
}
/**
+----------------------------------------------------------
* 获取最后一次插入数据库记录的索引ID号
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function getLastInsID() {
return $this->lastInsID;
}
/**
+----------------------------------------------------------
* 获取上一次操作影响的行数
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function getAffectedRows() {
return mysql_affected_rows($this->linkID);
}
/**
+----------------------------------------------------------
* 取得数据表的字段信息
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function getFields($tableName) {
$result = array();
$this->execute(‘SHOW COLUMNS FROM ‘ . $this->parseKey($tableName));
while ($row = mysql_fetch_array($this->queryID)) {
$result[] = $row;
}
$info = array();
if ($result) {
foreach ($result as $key => $val) {
$info[$val[‘Field‘]] = array(
‘name‘ => $val[‘Field‘],
‘type‘ => $val[‘Type‘],
‘notnull‘ => (bool) ($val[‘Null‘] === ‘‘), // not null is empty, null is yes
‘default‘ => $val[‘Default‘],
‘primary‘ => (strtolower($val[‘Key‘]) == ‘pri‘),
‘autoinc‘ => (strtolower($val[‘Extra‘]) == ‘auto_increment‘),
);
}
}
return $info;
}
/**
+----------------------------------------------------------
* 字段和表名处理添加`
+----------------------------------------------------------
* @access protected
+----------------------------------------------------------
* @param string $key
+----------------------------------------------------------
* @return string
+----------------------------------------------------------
*/
protected function parseKey(&$key) {
$key = trim($key);
if (false !== strpos($key, ‘ ‘) || false !== strpos($key, ‘,‘) || false !== strpos($key, ‘*‘) || false !== strpos($key, ‘(‘) || false !== strpos($key, ‘.‘) || false !== strpos($key, ‘`‘)) {
//如果包含* 或者 使用了sql方法 则不作处理
} else {
$key = ‘`‘ . $key . ‘`‘;
}
return $key;
}
/**
+----------------------------------------------------------
* 对保存到数据库的数据进行处理
+----------------------------------------------------------
* @access protected
+----------------------------------------------------------
* @param mixed $data 要操作的数据
+----------------------------------------------------------
* @return boolean
+----------------------------------------------------------
*/
private function _facade($data) {
// 检查非数据字段
if (!empty($this->fields)) {
foreach ($data as $key => $val) {
if (!array_key_exists($key, $this->fields)) {
unset($data[$key]);
}
}
}
return $data;
}
public function close(){
mysql_close($this->linkID);
}
public function __destruct(){
$this->close();
}
/*
** 2013.5.25新增
*/
public function getPk($table){
//将pk置为空
$this->pk = null;
$result = $this->getFields($table);
foreach($result as $key => $val){
if($val[‘primary‘]){
$this->pk = $key;
break;
}
}
return $this->pk;
}
public function fetch(&$rst = null , $array_type = MYSQL_ASSOC){
if($rst == null){
$rst = $this->queryID;
}
if($this->queryID)
return mysql_fetch_array($rst , $array_type);
else
return false;
}
//分解条件
private function _parseCondition($condition , $operator=‘AND‘){
$return = ‘‘;
if (is_array($condition)) {
$index = 0;
foreach ($condition as $key => $value) {
if ($index) {
$return .= " ".$operator;
}
$return .= "`{$key}`=‘{$value}‘";
$index++;
}
return $return;
}else{
return false;
}
}
/*事务处理开始*/
public function beginTransaction(){
$this->execute("START TRANSACTION");
}
public function commit(){
$this->execute("COMMIT");
}
public function rollback(){
$this->execute("ROLLBACK");
}
/*事务处理结束*/
//根据条件查找一条记录
public function find($table,$condition = null,$field = null){
if(is_array($condition)){
$condition = self::_parseCondition($condition);
}
//处理condition和field
$condition = $condition == null ? null : (is_array($condition) ? self::_parseCondition($condition) : $condition);
$field = $field == null ? ‘*‘ : (is_array($field) ? implode(",",$field) : $field);
$sql = ‘SELECT ‘ . $field . ‘ FROM ‘.$table;
if($condition != null){
$sql .= " WHERE " . $condition;
}
return $this->findOneBySql($sql);
}
//查找所有记录
public function findAll($table,$condition = null,$field = null){
if(is_array($condition)){
$condition = self::_parseCondition($condition);
}
//处理condition和field
$condition = $condition == null ? null : (is_array($condition) ? self::_parseCondition($condition) : $condition);
$field = $field == null ? ‘*‘ : (is_array($field) ? implode(",",$field) : $field);
$sql = ‘SELECT ‘ . $field . ‘ FROM ‘.$table;
if($condition != null){
$sql .= " WHERE " . $condition;
}
return $this->findallBySql($sql);
}
public function findOneBySql($sql){
$sql .= " LIMIT 1";
$this->execute($sql);
return $this->fetch();
}
public function findAllBySql($sql){
$rows = array();
$this->execute($sql);
while($row = $this->fetch()){
$rows[] = $row;
}
return $rows;
}
public function findByPk($table,$_pk){
$pk = $this->getPk($table);
if($pk == null){
$this->errorMsg = "未找到该表的主键";
return false;
}else{
return $this->find($table,array(
$pk => $_pk
));
}
}
public function deleteByPk($table,$_pk){
$pk = $this->getPk($table);
if($pk == null){
$this->errorMsg = "未找到该表的主键";
return false;
}else{
$sql = "DELETE FROM ".$table." WHERE `{$pk}`=‘{$_pk}‘";
return $this->delete($table,array(
$pk => $_pk
));
}
}
}
/*
* 类库更新日志 2013.5.25
* 1、update delete操作中的条件可以设置为数组形式$key=>$value
* 2、增加事务处理功能（只针对innodb引擎）
* 3、增加根据条件查找一条记录
* 4、增加根据条件查找所有记录
* 5、增加根据主键查找记录
* 6、增加根据主键删除记录
*/
?>
mysql操作类库--摘抄
时间： 2024-12-13 16:30:44