php mysql 封装类实例代码

<?php
class mysql {
private $db_host; //数据库主机
private $db_user; //数据库用户名
private $db_pwd; //数据库用户名密码
private $db_database; //数据库名
private $conn; //数据库连接标识;
private $result; //执行query命令的结果资源标识
private $sql; //sql执行语句
private $row; //返回的条目数
private $coding; //数据库编码，GBK,UTF8,gb2312
private $bulletin = true; //是否开启错误记录
private $show_error = false; //测试阶段，显示所有错误,具有安全隐患,默认关闭
private $is_error = false; //发现错误是否立即终止,默认true,建议不启用，因为当有问题时用户什么也看不到是很苦恼的
/*构造函数*/
public function __construct($db_host, $db_user, $db_pwd, $db_database, $conn, $coding) {
$this->db_host = $db_host;
$this->db_user = $db_user;
$this->db_pwd = $db_pwd;
$this->db_database = $db_database;
$this->conn = $conn;
$this->coding = $coding;
$this->connect();
}
/*数据库连接*/
public function connect() {
if ($this->conn == "pconn") {
//永久链接
$this->conn = mysql_pconnect($this->db_host, $this->db_user, $this->db_pwd);
} else {
//即使链接
$this->conn = mysql_connect($this->db_host, $this->db_user, $this->db_pwd);
}
if (!mysql_select_db($this->db_database, $this->conn)) {
if ($this->show_error) {
$this->show_error("数据库不可用：", $this->db_database);
}
}
mysql_query("SET NAMES $this->coding");
}
/*数据库执行语句，可执行查询添加修改删除等任何sql语句*/
public function query($sql) {
if ($sql == "") {
$this->show_error("SQL语句错误：", "SQL查询语句为空");
}
$this->sql = $sql;
$result = mysql_query($this->sql, $this->conn);
if (!$result) {
//调试中使用，sql语句出错时会自动打印出来
if ($this->show_error) {
$this->show_error("错误SQL语句：", $this->sql);
}
} else {
$this->result = $result;
}
return $this->result;
}
/*创建添加新的数据库*/
public function create_database($database_name) {
$database = $database_name;
$sqlDatabase = &#39;create database &#39; . $database;
$this->query($sqlDatabase);
}
/*查询服务器所有数据库*/
//将系统数据库与用户数据库分开，更直观的显示？
public function show_databases() {
$this->query("show databases");
echo "现有数据库：" . $amount = $this->db_num_rows($rs);
echo "<br />";
$i = 1;
while ($row = $this->fetch_array($rs)) {
echo "$i $row[Database]";
echo "<br />";
$i++;
}
}
//以数组形式返回主机中所有数据库名
public function databases() {
$rsPtr = mysql_list_dbs($this->conn);
$i = 0;
$cnt = mysql_num_rows($rsPtr);
while ($i < $cnt) {
$rs[] = mysql_db_name($rsPtr, $i);
$i++;
}
return $rs;
}
/*查询数据库下所有的表*/
public function show_tables($database_name) {
$this->query("show tables");
echo "现有数据库：" . $amount = $this->db_num_rows($rs);
echo "<br />";
$i = 1;
while ($row = $this->fetch_array($rs)) {
$columnName = "Tables_in_" . $database_name;
echo "$i $row[$columnName]";
echo "<br />";
$i++;
}
}
/*
mysql_fetch_row() array $row[0],$row[1],$row[2]
mysql_fetch_array() array $row[0] 或 $row[id]
mysql_fetch_assoc() array 用$row->content 字段大小写敏感
mysql_fetch_object() object 用$row[id],$row[content] 字段大小写敏感
*/
/*取得结果数据*/
public function mysql_result_li() {
return mysql_result($str);
}
/*取得记录集,获取数组-索引和关联,使用$row[&#39;content&#39;] */
public function fetch_array($resultt="") {
if($resultt<>""){
return mysql_fetch_array($resultt);
}else{
return mysql_fetch_array($this->result);
}
}
//获取关联数组,使用$row[&#39;字段名&#39;]
public function fetch_assoc() {
return mysql_fetch_assoc($this->result);
}
//获取数字索引数组,使用$row[0],$row[1],$row[2]
public function fetch_row() {
return mysql_fetch_row($this->result);
}
//获取对象数组,使用$row->content
public function fetch_Object() {
return mysql_fetch_object($this->result);
}
//简化查询select
public function findall($table) {
$this->query("SELECT * FROM $table");
}
//简化查询select
public function select($table, $columnName = "*", $condition = &#39;&#39;, $debug = &#39;&#39;) {
$condition = $condition ? &#39; Where &#39; . $condition : NULL;
if ($debug) {
echo "SELECT $columnName FROM $table $condition";
} else {
$this->query("SELECT $columnName FROM $table $condition");
}
}
//简化删除del
public function delete($table, $condition, $url = &#39;&#39;) {
if ($this->query("DELETE FROM $table WHERE $condition")) {
if (!empty ($url))
$this->Get_admin_msg($url, &#39;删除成功！&#39;);
}
}
//简化插入insert
public function insert($table, $columnName, $value, $url = &#39;&#39;) {
if ($this->query("INSERT INTO $table ($columnName) VALUES ($value)")) {
if (!empty ($url))
$this->Get_admin_msg($url, &#39;添加成功！&#39;);
}
}
//简化修改update
public function update($table, $mod_content, $condition, $url = &#39;&#39;) {
//echo "UPDATE $table SET $mod_content WHERE $condition"; exit();
if ($this->query("UPDATE $table SET $mod_content WHERE $condition")) {
if (!empty ($url))
$this->Get_admin_msg($url);
}
}
/*取得上一步 INSERT 操作产生的 ID*/
public function insert_id() {
return mysql_insert_id();
}
//指向确定的一条数据记录
public function db_data_seek($id) {
if ($id > 0) {
$id = $id -1;
}
if (!@ mysql_data_seek($this->result, $id)) {
$this->show_error("SQL语句有误：", "指定的数据为空");
}
return $this->result;
}
// 根据select查询结果计算结果集条数
public function db_num_rows() {
if ($this->result == null) {
if ($this->show_error) {
$this->show_error("SQL语句错误", "暂时为空，没有任何内容！");
}
} else {
return mysql_num_rows($this->result);
}
}
// 根据insert,update,delete执行结果取得影响行数
public function db_affected_rows() {
return mysql_affected_rows();
}
//输出显示sql语句
public function show_error($message = "", $sql = "") {
if (!$sql) {
echo "<font color=&#39;red&#39;>" . $message . "</font>";
echo "<br />";
} else {
echo "<fieldset>";
echo "<legend>错误信息提示:</legend><br />";
echo "<div style=&#39;font-size:14px; clear:both; font-family:Verdana, Arial, Helvetica, sans-serif;&#39;>";
echo "<div style=&#39;height:20px; background:#000000; border:1px #000000 solid&#39;>";
echo "<font color=&#39;white&#39;>错误号：12142</font>";
echo "</div><br />";
echo "错误原因：" . mysql_error() . "<br /><br />";
echo "<div style=&#39;height:20px; background:#FF0000; border:1px #FF0000 solid&#39;>";
echo "<font color=&#39;white&#39;>" . $message . "</font>";
echo "</div>";
echo "<font color=&#39;red&#39;><pre class="brush:php;toolbar:false">" . $sql . "