完整的PHP MYSQL数据库类

<?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 = 'create database ' . $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 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$row['content'] */
	public function fetch_array($resultt="") {
		if($resultt""){
			return mysql_fetch_array($resultt);
		}else{
		return mysql_fetch_array($this->result);
		}
	}

	//获取关联数组,使用$row['字段名']
	public function fetch_assoc() {
		return mysql_fetch_assoc($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 = '', $debug = '') {
		$condition = $condition ? ' Where ' . $condition : NULL;
		if ($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, $url = '') {
		if ($this->query("DELETE FROM $table WHERE $condition")) {
			if (!empty ($url))
				$this->Get_admin_msg($url, '删除成功！');
		}
	}

	//简化插入insert
	public function insert($table, $columnName, $value, $url = '') {
		if ($this->query("INSERT INTO $table ($columnName) VALUES ($value)")) {
			if (!empty ($url))
				$this->Get_admin_msg($url, '添加成功！');
		}
	}

	//简化修改update
	public function update($table, $mod_content, $condition, $url = '') {
		//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="red">" . $message . "</font>";
			echo "<br>";
		} else {
			echo "

" . $sql . "

";
		for ($i = 0; $i result, $i));
		}
		echo "