<?php

class mysql{
?
?private $db_host;
?private $db_user;
?private $db_pwd;
?private $db_database;
?private $conn;
?private $sql;
?private $result;
?private $coding;
?private $show_error = true;
?
?public function __construct($db_host, $db_user, $db_pwd, $db_database, $coding = 'utf8'){
??$this->db_host = $db_host;
??$this->db_user = $db_user;
??$this->db_pwd =? $db_pwd;
??$this->db_database = $db_database;
??$this->coding = $coding;
??$this->connect();
?}
?
?private function connect(){
??
??$this->conn = @mysql_connect($this->db_host,$this->db_user,$this->db_pwd);
??if(!$this->conn){
???if($this->show_error){
????$this->show_error('错误提示：链接数据库失败！');
???}
??}
??
??if(!@mysql_select_db($this->db_database, $this->conn)){
???if($this->show_error){
????$this->show_error('错误提示：打开数据库失败！');
???}
??}
??
??if(!@mysql_query("SET NAMES $this->coding")){
???if($this->show_error){
????$this->show_error('错误提示：设置编码失败！');
???}
??}
?}
?
?public function query($sql){
??$this->sql = $sql;
??$result = mysql_query($this->sql, $this->conn);
??if(!$result){
???$this->show_error('错误的SQL语句：', $this->sql);
??}else{
???return $this->result = $result;
??}
?}
?
?public function show_databases(){
??$this->query("show databases");
??echo '现有数据库：' . mysql_num_rows($this->result);
??echo "<br />";
??$i = 1;
??while($row=mysql_fetch_array($this->result)){
???echo "$i $row[Database]" . "<br />";
???$i++;
??}
?}
?
?public function show_tables(){
??$this->query("show tables");
??echo "数据库{$this->db_database}共有". mysql_num_rows($this->result) . "张表：";
??echo "<br />";
??$column_name = "Tables_in_" . $this->db_database;
??$i = 1;
??while($row=mysql_fetch_array($this->result)){
???echo "$i $row[$column_name]" . "<br />";
???$i++;
??}
?}
?
?public function fetch_array($result=''){
??if($this->result){
???return mysql_fetch_array($this->result);
??}else{
???return mysql_fetch_array($result);
??}
?}
?
?public function findall($table, $field = '*') {
??return $this->query("SELECT $field FROM $table");
?}
?
?public function delete($table, $condition) {
??return $this->query("DELETE FROM $table WHERE $condition");
?}
?
?public function insert($table, $field, $value) {
??return $this->query("INSERT INTO $table ($field) VALUES ('$value')");
?}
?
?public function update($table, $update_content, $condition) {
??return $this->query("UPDATE $table SET $update_content WHERE $condition");
?}
?
?public function insert_id() {
??return mysql_insert_id();
?}
?
?public function num_rows() {
??if ($this->result == null) {
???if ($this->show_error) {
????$this->show_error('SQL语句错误', '请检查是否已经使用了query()方法,并成功查询且返回了资源标识符？');
???}
??} else {
???return mysql_num_rows($this->result);
??}
?}
?
?public function num_fields($table) {
??$this->query("select * from $table");
??echo "<br />";
??echo '字段数：' . $total = mysql_num_fields($this->result);
??echo "<pre>";
??for ($i = 0; $i < $total; $i++) {
???print_r(mysql_fetch_field($this->result, $i));
??}
??echo "</pre>";
??echo "<br />";
?}
?
?public function show_error($message='',$sql=''){
??echo "<fieldset>";
??echo "<legend>错误信息提示:</legend><br />";
??echo "<div style='font-size:14px; clear:both; font-family:Verdana, Arial, Helvetica, sans-serif;'>";
??echo '错误原因：'. mysql_error() . "<br /><br />";
??echo "<div style='height:20px; background:#FF0000; border:1px #FF0000 solid'>";
??echo "<