/*
* mysql数据库 DB类
* @package db
* @author yytcpt(无影)
* @version 2008-03-27
* @copyrigth http://www.d5s.cn/
*/
class db {
var $connection_id = "";
var $pconnect = 0;
var $shutdown_queries = array();
var $queries = array();
var $query_id = "";
var $query_count = 0;
var $record_row = array();
var $failed = 0;
var $halt = "";
var $query_log = array();
function connect($db_config){
if ($this->pconnect){
$this->connection_id = mysql_pconnect($db_config["hostname"], $db_config["username"], $db_config["password"]);
}else{
$this->connection_id = mysql_connect($db_config["hostname"], $db_config["username"], $db_config["password"]);
}
if ( ! $this->connection_id ){
$this->halt("Can not connect MySQL Server");
}
if ( ! @mysql_select_db($db_config["database"], $this->connection_id) ){
$this->halt("Can not connect MySQL Database");
}
if ($db_config["charset"]) {
@mysql_unbuffered_query("SET NAMES '".$db_config["charset"]."'");
}
return true;
}
//发送SQL 查询,并返回结果集
function query($query_id, $query_type='mysql_query'){
$this->query_id = $query_type($query_id, $this->connection_id);
$this->queries[] = $query_id;
if (! $this->query_id ) {
$this->halt("查询失败:\n$query_id");
}
$this->query_count++;
$this->query_log[] = $str;
return $this->query_id;
}
//发送SQL 查询,并不获取和缓存结果的行
function query_unbuffered($sql=""){
return $this->query($sql, 'mysql_unbuffered_query');
}
//从结果集中取得一行作为关联数组
function fetch_array($sql = ""){
if ($sql == "") $sql = $this->query_id;
$this->record_row = @mysql_fetch_array($sql, MYSQL_ASSOC);
return $this->record_row;
}
function shutdown_query($query_id = ""){
$this->shutdown_queries[] = $query_id;
}
//取得结果集中行的数目,仅对 INSERT,UPDATE 或者 DELETE
function affected_rows() {
return @mysql_affected_rows($this->connection_id);
}
//取得结果集中行的数目,仅对 SELECT 语句有效
function num_rows($query_id="") {
if ($query_id == "") $query_id = $this->query_id;
return @mysql_num_rows($query_id);
}
//返回上一个 MySQL 操作中的错误信息的数字编码
function get_errno(){
$this->errno = @mysql_errno($this->connection_id);
return $this->errno;
}
//取得上一步 INSERT 操作产生的 ID
function insert_id(){
return @mysql_insert_id($this->connection_id);
}
//得到查询次数
function query_count() {
return $this->query_count;
}
//释放结果内存
function free_result($query_id=""){
if ($query_id == "") $query_id = $this->query_id;
@mysql_free_result($query_id);
}
//关闭 MySQL 连接
function close_db(){
if ( $this->connection_id ) return @mysql_close( $this->connection_id );
}
//列出 MySQL 数据库中的表
function get_table_names(){
global $db_config;
$result = mysql_list_tables($db_config["database"]);
$num_tables = @mysql_numrows($result);
for ($i = 0; $i $tables[] = mysql_tablename($result, $i);
}
mysql_free_result($result);
return $tables;
}
//从结果集中取得列信息并作为对象返回,取得所有字段
function get_result_fields($query_id=""){
if ($query_id == "") $query_id = $this->query_id;
while ($field = mysql_fetch_field($query_id)) {
$fields[] = $field;
}
return $fields;
}
//错误提示
function halt($the_error=""){
$message = $the_error."
\r\n";
$message.= $this->get_errno() . "
\r\n";
$sql = "INSERT INTO `db_error`(pagename, errstr, timer) VALUES('".$_SERVER["PHP_SELF"]."', '".addslashes($message)."', ".time().")";
@mysql_unbuffered_query($sql);
if (DEBUG==true){
echo "
echo "\r\n";
echo "\r\n";
echo "
\r\n";\r\n";
echo "\r\n";
echo "
exit;
}
}
function __destruct(){
$this->shutdown_queries = array();
$this->close_db();
}
function sql_select($tbname, $where="", $limit=0, $fields="*", $orderby="id", $sort="DESC"){
$sql = "SELECT ".$fields." FROM `".$tbname."` ".($where?" WHERE ".$where:"")." ORDER BY ".$orderby." ".$sort.($limit ? " limit ".$limit:"");
return $sql;
}
function sql_insert($tbname, $row){
foreach ($row as $key=>$value) {
$sqlfield .= $key.",";
$sqlvalue .= "'".$value."',";
}
return "INSERT INTO `".$tbname."`(".substr($sqlfield, 0, -1).") VALUES (".substr($sqlvalue, 0, -1).")";
}
function sql_update($tbname, $row, $where){
foreach ($row as $key=>$value) {
$sqlud .= $key."= '".$value."',";
}
return "UPDATE `".$tbname."` SET ".substr($sqlud, 0, -1)." WHERE ".$where;
}
function sql_delete($tbname, $where){
return "DELETE FROM `".$tbname."` WHERE ".$where;
}
//新增加一条记录
function row_insert($tbname, $row){
$sql = $this->sql_insert($tbname, $row);
return $this->query_unbuffered($sql);
}
//更新指定记录
function row_update($tbname, $row, $where){
$sql = $this->sql_update($tbname, $row, $where);
return $this->query_unbuffered($sql);
}
//删除满足条件的记录
function row_delete($tbname, $where){
$sql = $this->sql_delete($tbname, $where);
return $this->query_unbuffered($sql);
}
/* 根据条件查询,返回所有记录
* $tbname 表名, $where 查询条件, $limit 返回记录, $fields 返回字段
*/
function row_select($tbname, $where="", $limit=0, $fields="*", $orderby="id", $sort="DESC"){
$sql = $this->sql_select($tbname, $where, $limit, $fields, $orderby, $sort);
return $this->row_query($sql);
}
//详细显示一条记录
function row_select_one($tbname, $where, $fields="*", $orderby="id"){
$sql = $this->sql_select($tbname, $where, 1, $fields, $orderby);
return $this->row_query_one($sql);
}
function row_query($sql){
$rs = $this->query($sql);
$rs_num = $this->num_rows($rs);
$rows = array();
for($i=0; $i $rows[] = $this->fetch_array($rs);
}
$this->free_result($rs);
return $rows;
}
function row_query_one($sql){
$rs = $this->query($sql);
$row = $this->fetch_array($rs);
$this->free_result($rs);
return $row;
}
//计数统计
function row_count($tbname, $where=""){
$sql = "SELECT count(id) as row_sum FROM `".$tbname."` ".($where?" WHERE ".$where:"");
$row = $this->row_query_one($sql);
return $row["row_sum"];
}
}
?>
很久没有发帖了,把我常用的一些php类文件分享出来。
如果您加了新功能,或者是有改进,请与大家一起分享。
$db_config["hostname"] = "127.0.0.1"; //服务器地址
$db_config["username"] = "root"; //数据库用户名
$db_config["password"] = "root"; //数据库密码
$db_config["database"] = "wap_blueidea_com"; //数据库名称
$db_config["charset"] = "utf8";
include('db.php');
$db = new db();
$db->connect($db_config);
//例:查询表 table_name 中 cid=1的所有记录。
$row = $db->row_select('table_name', 'cid=1');
?>
更详细的使用方法,请参考 db类文件中的注释。

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


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