A database operation PHP class-PHP Tutorial-php.cn

A database operation PHP class

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Release： 2016-07-25 08:44:27

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/*
* Author Molong
* Time December 2, 2010 15:50:35
*/
$db = new mysql($db_host,$db_user,$db_password, $db_table,$db_conn,$pre,$coding);
class mysql{
private $db_host;
private $db_user;
private $db_password;
private $db_table;
private $db_conn; //Database connection identification;
private $result; //Result resource identification of executing query command
private $sql; //SQL execution statement
private $pre; //Database table prefix
private $coding; //Database encoding, GBK, UTF8, gb2312
function __construct($db_host,$db_user,$db_password,$db_table,$db_conn,$pre,$coding){
$this->db_host = $db_host;
$this->db_user = $db_user;
$this->db_password = $db_password;
$this->db_table = $db_table;
$this->db_conn = $db_conn;
$this->pre = $pre;
$this->coding = $coding;
$this->connect();
}
function connect(){
$this->db_conn = @mysql_connect($this->db_host,$this->db_user, $this->db_password) or die($this->show_error("Database link error, please check the database link configuration! "));
if(!mysql_select_db($this->db_table,$this->db_conn)){
echo "Data table not found: ".$this->db_table;
}
mysql_select_db($ this->db_table,$this->db_conn);
$this->query("SET NAMES $this->coding");
}
/*Function to execute SQL statements*/
function query ($sql){
if(emptyempty($sql)){
$this->show_error("Your sql statement cannot be empty!");
}else{
$this->sql = $sql;
}
$result = mysql_query($this->sql,$this->db_conn);
return $this->result = $result;
}
/*Create and add a new database*/
public function create_database($database_name){
$database=$database_name;
$sqlDatabase = 'create database '.$database;
return $this- >query($sqlDatabase);
}
// Calculate the number of result set items based on the select query results
public function db_num_rows(){
if($this->result==null){
if($this- >show_error){
$this->show_error("sql statement error!");
}
}else{
return mysql_num_rows($this->result);
}
}
/*Query all server Database*/
//Separate the system database and the user database for a more intuitive display?
public function show_databases(){
$this->query("show databases");
echo "Existing database:".$ amount =$this->db_num_rows($rs);
echo "
";
$i=1;
while($row = $this->fetch_array($rs)){
echo "$i $row[Database]";
echo "
";
$i++;
}
}
//Return all database names in the host in array form
public function databases()
{
$rsPtr=mysql_list_dbs($this->db_conn);
$i=0;
$cnt=mysql_num_rows($rsPtr);
while($i<$cnt)
{
$rs[]=mysql_db_name($ rsPtr,$i);
$i++;
}
return print_r($rs);
}
/*Query all tables under the database*/
function show_tables($database_name){
$this->query( "show tables");
echo "Existing database:".$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] or $row[id]
mysql_fetch_assoc() array uses $row->content field case sensitivity
mysql_fetch_object() object uses $row[id],$row[content] fields case sensitivity
*/
/*Get the record set, get the array-index and association, use $row['content'] */
public function fetch_array()
{
return @mysql_fetch_array($this->result);
}
//Get the association array, use $row[' field name']
public function fetch_ass()
{
return @mysql_fetch_assoc($this->result);
}
//Get the numeric index array, use $row[0],$row[1],$row [2]
public function fetch_row()
{
return @mysql_fetch_row($this->result);
}
//Get the object array, use $row->content
public function fetch_Object()
{
return @mysql_fetch_object($this->result);
}
//Simplified query select
public function findall($table){
$table = $this->fulltablename($table);
$this-> ;query("select * from $table");
}
public function select($table,$columnName,$condition){
$table = $this->fulltablename($table);
if(emptyempty( $columnName)){
$columnName = "*";
}
$this->query("SELECT $columnName FROM $table $condition");
}
//Simplified insert
function insert($table ,$arr){
$table = $this->fulltablename($table);
$sql = "INSERT INTO $table ";
if(!is_array($arr)){
$this->show_error( "Please enter the parameter array!");
}else{
$k = "";
$v = "";
foreach($arr as $key => $value){
$k .= "`$key`,";
$v .= "'".$value."',";
}
}
$sql = $sql." (".substr($k,0,-1).") VALUES (".substr($v,0,-1).")";
$this->query($sql);
}
//简化的update
function update($table,$arr,$where){
$table = $this->fulltablename($table);
$sql = "UPDATE $table SET ";
if(!is_array($arr)){
$this->show_error("请输入参数数组！");
}else{
foreach($arr as $key => $value){
$sql .= " `".$key."` = '".$value."' ,";
}
}
$sql = substr($sql,0,-1)." where ".$where;
return $this->query($sql);
}
//Simplified delete
function delete($ table,$where = ""){
$table = $this->fulltablename($table);
if(emptyempty($where)){
$this->show_error("Condition cannot be empty!") ;
}else{
$where = " where ".$where;
}
$sql = "DELETE FROM $table ".$where;
//echo $sql;
return $this->query($sql );
}
//Get the ID generated by the previous INSERT operation
public function insert_id(){
return mysql_insert_id();
}
//Prefixed data table
public function fulltablename($table){
return $table = $this->pre.$table;
}
//Query the number of fields
public function num_fields($table){
$table = $this->fulltablename($table);
$ this->query("select * from $table");
echo "
";
echo "Number of fields: ".$total = mysql_num_fields($this->result);
echo "
```
"; 
```
for ($i=0; $i<$total; $i++){
print_r(mysql_fetch_field($this->result,$i) );
}
echo "
echo "
";
}
//Get MySQL server information
public function mysql_server($num=''){
switch ($num){
case 1:
return mysql_get_server_info (); //MySQL server information
break;
case 2 :
return mysql_get_host_info(); //Get MySQL host information
break;
case 3 :
return mysql_get_client_info(); //Get MySQL client information
break;
case 4:
return mysql_get_proto_info(); //Get MySQL protocol information
break;
default:
return mysql_get_client_info(); //Get mysql version information by default
}
}
//Destructor , automatically close the database, garbage collection mechanism
/*public function __destruct()
{
if(!empty($this->result)){
$this->free();
}
mysql_close($this ->$db_conn);
}*/
/*Get the real IP address of the client*/
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 show_error($str){
echo "";
}
}
?>

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