php数据库操作类

<?php

002	Class DB {

003

004	private $link_id;

005	private $handle;

006	private $is_log;

007	private $time;

008

009

//构造函数

010	public function __construct() {

011	$this->time = $this->microtime_float();

012	require_once("config.db.php");

013	$this->connect($db_config["hostname"], $db_config["username"], $db_config["password"], $db_config["database"], $db_config["pconnect"]);

014	$this->is_log = $db_config["log"];

015	if($this->is_log){

016	$handle = fopen($db_config["logfilepath"]."dblog.txt", "a+");

017	$this->handle=$handle;

018

}

019

}

020

021

//数据库连接

022	public function connect($dbhost, $dbuser, $dbpw, $dbname, $pconnect = 0,$charset='utf8') {

023	if( $pconnect==0 ) {

024	$this->link_id = @mysql_connect($dbhost, $dbuser, $dbpw, true);

025	if(!$this->link_id){

026	$this->halt("数据库连接失败");

027

}

028

} else {

029	$this->link_id = @mysql_pconnect($dbhost, $dbuser, $dbpw);

030	if(!$this->link_id){

031	$this->halt("数据库持久连接失败");

032

}

033

}

034	if(!@mysql_select_db($dbname,$this->link_id)) {

035	$this->halt('数据库选择失败');

036

}

037	@mysql_query("set names ".$charset);

038

}

039

040

//查询

041	public function query($sql) {

042	$this->write_log("查询 ".$sql);

043	$query = mysql_query($sql,$this->link_id);

044	if(!$query) $this->halt('Query Error: ' . $sql);

045	return $query;

046

}

047

048	//获取一条记录（MYSQL_ASSOC，MYSQL_NUM，MYSQL_BOTH）

049	public function get_one($sql,$result_type = MYSQL_ASSOC) {

050	$query = $this->query($sql);

051	$rt =& mysql_fetch_array($query,$result_type);

052	$this->write_log("获取一条记录 ".$sql);

053	return $rt;

054

}

055

056

//获取全部记录

057	public function get_all($sql,$result_type = MYSQL_ASSOC) {

058	$query = $this->query($sql);

059

$i = 0;

060	$rt = array();

061	while($row =& mysql_fetch_array($query,$result_type)) {

062	$rt[$i]=$row;

063

$i++;

064

}

065	$this->write_log("获取全部记录 ".$sql);

066	return $rt;

067

}

068

069

//插入

070	public function insert($table,$dataArray) {

071	$field = "";

072	$value = "";

073	if( !is_array($dataArray) || count($dataArray)<=0) {

074	$this->halt('没有要插入的数据');

075	return false;

076

}

077	while(list($key,$val)=each($dataArray)) {

078	$field .="$key,";

079	$value .="'$val',";

080

}

081	$field = substr( $field,0,-1);

082	$value = substr( $value,0,-1);

083	$sql = "insert into $table($field) values($value)";

084	$this->write_log("插入 ".$sql);

085	if(!$this->query($sql)) return false;

086	return true;

087

}

088

089

//更新

090	public function update( $table,$dataArray,$condition="") {

091	if( !is_array($dataArray) || count($dataArray)<=0) {

092	$this->halt('没有要更新的数据');

093	return false;

094

}

095	$value = "";

096	while( list($key,$val) = each($dataArray))

097	$value .= "$key = '$val',";

098	$value .= substr( $value,0,-1);

099	$sql = "update $table set $value where 1=1 and $condition";

100	$this->write_log("更新 ".$sql);

101	if(!$this->query($sql)) return false;

102	return true;

103

}

104

105

//删除

106	public function delete( $table,$condition="") {

107	if( empty($condition) ) {

108	$this->halt('没有设置删除的条件');

109	return false;

110

}

111	$sql = "delete from $table where 1=1 and $condition";

112	$this->write_log("删除 ".$sql);

113	if(!$this->query($sql)) return false;

114	return true;

115

}

116

117

//返回结果集

118	public function fetch_array($query, $result_type = MYSQL_ASSOC){

119	$this->write_log("返回结果集");

120	return mysql_fetch_array($query, $result_type);

121

}

122

123

//获取记录条数

124	public function num_rows($results) {

125	if(!is_bool($results)) {

126	$num = mysql_num_rows($results);

127	$this->write_log("获取的记录条数为".$num);

128	return $num;

129

} else {

130

return 0;

131

}

132

}

133

134

//释放结果集

135	public function free_result() {

136	$void = func_get_args();

137	foreach($void as $query) {

138	if(is_resource($query) && get_resource_type($query) === 'mysql result') {

139	return mysql_free_result($query);

140

}

141

}

142	$this->write_log("释放结果集");

143

}

144

145	//获取最后插入的id

146	public function insert_id() {

147	$id = mysql_insert_id($this->link_id);

148	$this->write_log("最后插入的id为".$id);

149	return $id;

150

}

151

152

//关闭数据库连接

153	protected function close() {

154	$this->write_log("已关闭数据库连接");

155	return @mysql_close($this->link_id);

156

}

157

158

//错误提示

159	private function halt($msg='') {

160	$msg .= "\r\n".mysql_error();

161	$this->write_log($msg);

162	die($msg);

163

}

164

165

//析构函数

166	public function __destruct() {

167	$this->free_result();

168	$use_time = ($this-> microtime_float())-($this->time);

169	$this->write_log("完成整个查询任务,所用时间为".$use_time);

170	if($this->is_log){

171	fclose($this->handle);

172

}

173

}

174

175

//写入日志文件

176	public function write_log($msg=''){

177	if($this->is_log){

178	$text = date("Y-m-d H:i:s")." ".$msg."\r\n";

179	fwrite($this->handle,$text);

180

}

181

}

182

183

//获取毫秒数

184	public function microtime_float() {

185	list($usec, $sec) = explode(" ", microtime());

186	return ((float)$usec + (float)$sec);

187

}

188

}

189

190

?>

[代码] config.db.php

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01

<?php

02	$db_config["hostname"] = "localhost"; //服务器地址

03	$db_config["username"] = "root"; //数据库用户名

04	$db_config["password"] = "123"; //数据库密码

05	$db_config["database"] = "test"; //数据库名称

06	$db_config["charset"] = "utf8";//数据库编码

07	$db_config["pconnect"] = 1;//开启持久连接

08	$db_config["log"] = 1;//开启日志

09	$db_config["logfilepath"] = './';//开启日志

10

?>