php mysql完整数据库连接类
php教程 mysql教程完整数据库教程连接类
*/
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 "
";
$i = 1;
while ($row = $this->fetch_array($rs)) {
echo "$i $row[database]";
echo "
";
$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 $rs[] = mysql_db_name($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 "
";
$i = 1;
while ($row = $this->fetch_array($rs)) {
$columnname = "tables_in_" . $database_name;
echo "$i $row[$columnname]";
echo "
";
$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 "" . $message . "";
echo "
";
} else {
echo "echo "
";
}//释放结果集
public function free() {
@ mysql_free_result($this->result);
}//数据库选择
public function select_db($db_database) {
return mysql_select_db($db_database);
}//查询字段数量
public function num_fields($table_name) {
//return mysql_num_fields($this->result);
$this->query("select * from $table_name");
echo "
";
echo "字段数：" . $total = mysql_num_fields($this->result);
echo "";";
for ($i = 0; $i print_r(mysql_fetch_field($this->result, $i));
}
echo "
echo "
";
}//取得 mysql 服务器信息
public function mysql_server($num = '') {
switch ($num) {
case 1 :
return mysql_get_server_info(); //mysql 服务器信息
break;case 2 :
return mysql_get_host_info(); //取得 mysql 主机信息
break;case 3 :
return mysql_get_client_info(); //取得 mysql 客户端信息
break;case 4 :
return mysql_get_proto_info(); //取得 mysql 协议信息
break;default :
return mysql_get_client_info(); //默认取得mysql版本信息
}
}//析构函数，自动关闭数据库,垃圾回收机制
public function __destruct() {
if (!empty ($this->result)) {
$this->free();
}
mysql_close($this->conn);
} //function __destruct();/*获得客户端真实的ip地址*/
function getip() {
if (getenv("http_client_ip") && strcasecmp(getenv("http_client_ip"), "unknown")) {
$ip = getenv("http_client_ip");
} else
if (getenv("http_x_forwarded_for") && strcasecmp(getenv("http_x_forwarded_for"), "unknown")) {
$ip = getenv("http_x_forwarded_for");
} else
if (getenv("remote_addr") && strcasecmp(getenv("remote_addr"), "unknown")) {
$ip = getenv("remote_addr");
} else
if (isset ($_server['remote_addr']) && $_server['remote_addr'] && strcasecmp($_server['remote_addr'], "unknown")) {
$ip = $_server['remote_addr'];
} else {
$ip = "unknown";
}
return ($ip);
}
function inject_check($sql_str) { //防止注入
$check = eregi('select|insert|update|delete|'|/*|*|../|./|union|into|load_file|outfile', $sql_str);
if ($check) {
echo "输入非法注入内容！";
exit ();
} else {
return $sql_str;
}
}
function checkurl() { //检查来路
if (preg_replace("/https教程?://([^:/]+).*/i", "1", $_server['http_referer']) !== preg_replace("/([^:]+).*/", "1", $_server['http_host'])) {
header("location: http://www.zhutiai.com");
exit();
}
}}