A php class to connect to mysql database

/*
* filename: mysql database connection class
* edit bbs.it-home.org
*/
class mysql{
private $db_host; //database host
private $db_user ; //Database username
private $db_pwd; //Database username and password
private $db_database; //Database name
private $conn; //Database connection identifier;
private $result; //Result resource of executing query command Identification
private $sql; //sql execution statement
private $row; //number of entries returned
private $coding; //database encoding, GBK, UTF8, gb2312
private $bulletin = true; //whether to enable error logging
private $show_error = true; // During the test phase, all errors are displayed, which has security risks. It is turned off by default.
private $is_error = false; // Whether to terminate immediately when an error is found. The default is true. It is recommended not to enable it because when there is a problem, the user It’s very frustrating when you can’t see anything
/*Constructor*/
public function __construct($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;
$this->connect();
}
/*database connection*/
public function connect()
{
if($this->conn=="pconn"){
 //Permanent link
$this->conn=mysql_pconnect($this->db_host,$this->db_user,$this->db_pwd);
}else{
//Instant link
$this-> ;conn=mysql_connect($this->db_host,$this->db_user,$this->db_pwd);
}
if(!mysql_select_db($this->db_database,$this->conn)) {
if($this->show_error){
$this->show_error("Database not available:",$this->db_database);
}
}
mysql_query("SET NAMES $this-> coding");
}
/*Database execution statement, executable query, add, modify, delete, etc. any sql statement*/
public function query($sql)
{
if($sql == ""){
$this- >show_error("SQL statement error:","SQL query statement is empty");}
$this->sql = $sql;
$result = mysql_query($this->sql,$this-> conn);
if(!$result){
//Used in debugging, it will be automatically printed out when an error occurs in the sql statement
if($this->show_error){
$this->show_error("Error sql statement: ",$this->sql);
}
}else{
$this->result = $result;
}
return $this->result;
}
/*Create and add a new database*/
public function create_database($database_name){
$database=$database_name;
$sqlDatabase = 'create database '.$database;
$this->query($sqlDatabase);
}
/*Query all databases of the server* /
//Separate the system database and user database for a more intuitive display?
public function show_databases(){
$rs=$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($i<$cnt)
{
$rs[]=mysql_db_name($rsPtr,$i);
$i++;
}
return $rs;
}
/*查询数据库下所有的表*/
function show_tables($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()
{
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)
{
if($columnName==""){
$columnName="*";
}
$this->query("SELECT $columnName FROM $table $condition");
}
//简化删除del
public function delete($table,$condition){
$this->query("DELETE FROM $table WHERE $condition");
}
//简化插入insert
public function insert($table,$columnName,$value){
$this->query("INSERT INTO $table ($columnName) VALUES ($value)");
}
//简化修改update
public function update($table,$mod_content,$condition){
$this->query("UPDATE $table SET $mod_content WHERE $condition");
}
/*取得上一步 INSERT 操作产生的 ID*/
public function insert_id(){
return mysql_insert_id();
}
//指向确定的一条数据记录
public function db_data_seek($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 "错误信息提示:";
echo "";
echo "";
echo "错误号：12142";
echo "

";

echo "

".$sql."

";

$ip=$this->getip();

if($this->bulletin){

$time = date("Y-m-d H:i:s");

$message=$message."/r/n$this->sql"."/r/n客户IP:$ip"."/r/n时间 :$time"."/r/n/r/n";

$server_date=date("Y-m-d");

$filename=$server_date.".txt";

$file_path="error/".$filename;

$error_content=$message;

//$error_content="错误的数据库，不可以链接";

$file = "error"; //设置文件保存目录

//建立文件夹

if(!file_exists($file)){

if(!mkdir($file,0777)){

//默认的 mode 是 0777，意味着最大可能的访问权

die("upload files directory does not exist and creation failed");

}

}

//建立txt日期文件

if(!file_exists($file_path)){

//echo "建立日期文件";

fopen($file_path,"w+");

//首先要确定文件存在并且可写

if (is_writable($file_path))

{

//使用添加模式打开$filename，文件指针将会在文件的开头

if (!$handle = fopen($file_path, 'a'))

{

echo "不能打开文件 $filename";

exit;

}

//将$somecontent写入到我们打开的文件中。

if (!fwrite($handle, $error_content))

{

echo "不能写入到文件 $filename";

exit;

}

//echo "文件 $filename 写入成功";

echo "——错误记录被保存!";

//关闭文件

fclose($handle);

} else {

echo "文件 $filename 不可写";

}

}else{

//首先要确定文件存在并且可写

if (is_writable($file_path))

{

//使用添加模式打开$filename，文件指针将会在文件的开头

if (!$handle = fopen($file_path, 'a'))

{

echo "不能打开文件 $filename";

exit;

}

//将$somecontent写入到我们打开的文件中。

if (!fwrite($handle, $error_content))

{

echo "不能写入到文件 $filename";

exit;

}

//echo "文件 $filename 写入成功";

echo "——错误记录被保存!";

//关闭文件

fclose($handle);

} else {

echo "文件 $filename 不可写";

}

}

}

echo "
";

if($this->is_error){

exit;

}

}

echo "";

echo "";

echo "
";

}

//Release the result set

public function free(){

@mysql_free_result($this->result) ;

}

//Database selection

public function select_db($db_database){

return mysql_select_db($db_database);

}

//Query the number of fields

public function num_fields($table_name){

//return mysql_num_fields($this ->result);

$this->query("select * from $table_name");

echo "
";

echo "Number of fields: ".$total = mysql_num_fields($this- >result);

echo "

";</li>
<li>for ($i=0; $i<$total; $i++){<li>print_r(mysql_fetch_field($this->result,$i) );</li>
<li> }</li>
<li>echo "

";

echo "
";

}

//Get MySQL server information

public function mysql_server($num=''){

switch ($num){

case 1:

return mysql_get_server_info(); //MySQL server information

break;

case 2:

return mysql_get_host_info(); //Get MySQL host information

break;

case 3:

return mysql_get_client_info(); //Get MySQL client information

break;

case 4:

return mysql_get_proto_info(); //Get MySQL protocol information

break;

default:

return mysql_get_client_info(); //Get mysql version information by default

}

}

//Analysis Constructor, automatically close the database, garbage collection mechanism

public function __destruct()

{

if(!empty($this->result)){

$this->free();

}

mysql_close($this ->conn);

}//function __destruct();

/*Get the client’s real IP address*/

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);

}

}

?>

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