数据库封装类
<?php
Class DB {
private $link_id;
private $handle;
private $is_log;
private $time;
//构造函数
public function __construct() {
$this->time = $this->microtime_float();
require_once("config.db.php");
$this->connect($db_config["hostname"], $db_config["username"], $db_config["password"], $db_config["database"], $db_config["pconnect"]);
$this->is_log = $db_config["log"];
if($this->is_log){
$handle = fopen($db_config["logfilepath"]."dblog.txt", "a+");
$this->handle=$handle;
}
}
//数据库连接
public function connect($dbhost, $dbuser, $dbpw, $dbname, $pconnect = 0,$charset='utf8') {
if( $pconnect==0 ) {
$this->link_id = @mysql_connect($dbhost, $dbuser, $dbpw, true);
if(!$this->link_id){
$this->halt("数据库连接失败");
}
} else {
$this->link_id = @mysql_pconnect($dbhost, $dbuser, $dbpw);
if(!$this->link_id){
$this->halt("数据库持久连接失败");
}
}
if(!@mysql_select_db($dbname,$this->link_id)) {
$this->halt('数据库选择失败');
}
@mysql_query("set names ".$charset);
}
//查询
public function query($sql) {
$this->write_log("查询 ".$sql);
$query = mysql_query($sql,$this->link_id);
if(!$query) $this->halt('Query Error: ' . $sql);
return $query;
}
//获取一条记录（MYSQL_ASSOC，MYSQL_NUM，MYSQL_BOTH）
public function get_one($sql,$result_type = MYSQL_ASSOC) {
$query = $this->query($sql);
$rt =& mysql_fetch_array($query,$result_type);
$this->write_log("获取一条记录 ".$sql);
return $rt;
}
//获取全部记录
public function get_all($sql,$result_type = MYSQL_ASSOC) {
$query = $this->query($sql);
$i = 0;
$rt = array();
while($row =& mysql_fetch_array($query,$result_type)) {
$rt[$i]=$row;
$i++;
}
$this->write_log("获取全部记录 ".$sql);
return $rt;
}
//插入
public function insert($table,$dataArray) {
$field = "";
$value = "";
if( !is_array($dataArray) || count($dataArray)<=0) {
$this->halt('没有要插入的数据');
return false;
}
while(list($key,$val)=each($dataArray)) {
$field .="$key,";
$value .="'$val',";
}
$field = substr( $field,0,-1);
$value = substr( $value,0,-1);
$sql = "insert into $table($field) values($value)";
$this->write_log("插入 ".$sql);
if(!$this->query($sql)) return false;
return true;
}
//更新
public function update( $table,$dataArray,$condition="") {
if( !is_array($dataArray) || count($dataArray)<=0) {
$this->halt('没有要更新的数据');
return false;
}
$value = "";
while( list($key,$val) = each($dataArray))
$value .= "$key = '$val',";
$value .= substr( $value,0,-1);
$sql = "update $table set $value where 1=1 and $condition";
$this->write_log("更新 ".$sql);
if(!$this->query($sql)) return false;
return true;
}