Home > Article > Backend Development > The fifth day of php practice_PHP tutorial
The fifth day of php practice_PHP tutorial
- WBOYOriginal
- 2016-07-14 10:10:52768browse
PHP monomorphic design mode, my understanding is to create a static variable in the class so that there is only one, and use a method to return the object. This method checks whether the object exists before creating it. Thus achieving a single object.
Set __construct() to private so that new cannot be used. Self is the meaning of this class. "::" calls static method
[php]
/**
*
*/
class myclass
{
static private $db_class;
static public function getClass()
If (is_null(self::$db_class)) {
self::$db_class=new myclass();
echo "Create object";
}else{
echo "Return to the original object";
return self::$db_class;
}
private function __construct()
echo "11111111111111";
}
Public function __destruct(){
echo "
aaaaaaaaaaaa";
}
Public function show(){
echo "bbbbbbbbbbbbbbb";
}
}
$a=myclass::getClass();
$a=myclass::getClass();
$a=myclass::getClass();
$a=myclass::getClass();
$a=myclass::getClass();
$a=myclass::getClass();
$a=myclass::getClass();
$a=myclass::getClass();
$a=myclass::getClass();
$a=myclass::getClass();
$a->show();
/*//If you use new directly, an error will be reported!!!
new myclass();
new myclass();
new myclass();
new myclass();
new myclass();
new myclass();
new myclass();
new myclass();*/
?>
/**
*/
class myclass
{
static private $db_class;
static public function getClass()
{
if (is_null(self::$db_class)) {
Self::$db_class=new myclass();
echo "Create object";
}else{
echo "Return to the original object";
Return self::$db_class;
}
}
private function __construct()
{
echo "11111111111111";
}
public function __destruct(){
echo "
aaaaaaaaaaaa";
}
public function show(){
echo "bbbbbbbbbbbbbbb";
}
}
$a=myclass::getClass();
$a=myclass::getClass();
$a=myclass::getClass();
$a=myclass::getClass();
$a=myclass::getClass();
$a=myclass::getClass();
$a=myclass::getClass();
$a=myclass::getClass();
$a=myclass::getClass();
$a=myclass::getClass();
$a->show();
/*//If you use new directly, an error will be reported!!!
new myclass();
new myclass();
new myclass();
new myclass();
new myclass();
new myclass();
new myclass();
new myclass();*/
?>
This is a small example. The monomorphic mysql class is given below
[php]
// +-------------------------------------------------- -----------------------
// |MySQL operation class
// +-------------------------------------------------- -----------------------
// |@微梁QQ:496928838
// +-------------------------------------------------- -----------------------
class MySQL{
Private $db_mysql_hostname;
Private $db_mysql_username;
Private $db_mysql_password;
Private $db_mysql_database;
Private $db_mysql_port;
Private $db_mysql_charset;
Private $query_list = array();
//Number of queries
Public $query_count = 0;
//Query start time
Public $query_start_time;
//Current query ID
protected $queryID;
//Current connection
protected $conn;
// Number of transaction instructions
protected $transTimes = 0;
// Return or affect the number of records
protected $numRows = 0;
// Error message
protected $error = '';
//Static instance
static private $db_class;
//Get this category
static public function getClass()
{
If (is_null(self::$db_class)) {
self::$db_class=new MySQL();
}
return self::$db_class;
}
//If it is defined as a private method, it will be new. Use getClass
Private function __construct()
{
}
Public function connect($hostname_or_conf,$username,$password,$database,$port = '3306',$char = 'utf8'){
If(is_array($hostname_or_conf)){
$this->db_mysql_hostname = $hostname_or_conf['hostname'];
$this->db_mysql_username = $hostname_or_conf['username'];
$this->db_mysql_password = $hostname_or_conf['password'];
$this->db_mysql_database = $hostname_or_conf['database'];
$this->db_mysql_port = isset($hostname_or_conf['port'])?$hostname_or_conf['port']:'3306';
$this->db_mysql_charset = isset($hostname_or_conf['charset'])?$hostname_or_conf['charset']:'utf8';
}elseif(!empty($hostname_or_conf)||!empty($username)||!empty($password)||!empty($database))
$this->db_mysql_hostname = $hostname_or_conf;
$this->db_mysql_username = $username;
$this->db_mysql_password = $password;
$this->db_mysql_database = $database;
$this->db_mysql_port = $port;
$this->db_mysql_charset = $char;
}else{
die('configuration error.');
}
$server = $this->db_mysql_hostname.':'.$this->db_mysql_port;
$this->conn = mysql_connect($server,$this->db_mysql_username,$this->db_mysql_password,true) or die('Connect MySQL DB error!');
mysql_select_db($this->db_mysql_database,$this->conn) or die('select db error!');
mysql_query("set names " . $this->db_mysql_charset, $this->conn);
}
/**
+------------------------------------------------- ----------
* Set data object value
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
*table,where,order,limit,data,field,join,group,having
+------------------------------------------------- ----------
*/
public function table($table){
$this->query_list['table'] = $table;
return $this;
}
public function where($where){
$this->query_list['where'] = $where;
return $this;
}
public function order($order){
$this->query_list['order'] = $order;
return $this;
}
public function limit($offset,$length=null){
if (is_null($length)) {
$this->query_list['limit']='limit '.$offset;
return $this;
}else {
if(!isset($length)){
$length = $offset;
$offset = 0;
}
$this->query_list['limit'] = 'limit '.$offset.','.$length;
return $this;
}
}
public function data($data){
//读取数据表字段,然后处理表单数据
$dataList = $this->getFields($this->query_list['table']);
$arr=array();
foreach ($dataList as $key=>$value) {
if (array_key_exists ($key,$data) ) {
$arr[$key]=$data[$key];
}
}
//var_dump($arr);
/*
if(is_object($data)){
$data = get_object_vars($data);
}elseif (is_string($data)){
parse_str($data,$data);
}elseif(!is_array($data)){
//Log:DATA_TYPE_INVALID
}
*/
$this->query_list['data'] = $arr;
return $this;
}
public function field($fields){
$this->query_list['fields'] = $fields;
return $this;
}
public function join($join){
$this->query_list['join'] = $join;
return $this;
}
public function group($group){
$this->query_list['group'] = $group;
return $this;
}
public function having($having){
$this->query_list['having'] = $having;
return $this;
}
/**
+------------------------------------------------- ----------
* Query
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @param
+------------------------------------------------- ----------
*/
public function select(){
$select_sql = 'select ';
$fields = isset($this->query_list['fields'])?$this->query_list['fields']:'*';
$select_sql.=$fields;
$select_sql.= ' from `'.$this->query_list['table'].'` ';
isset($this->query_list['join'])?($select_sql.=$this->query_list['join']):'';
isset($this->query_list['where'])?($select_sql.=' where '.$this->query_list['where']):'';
isset($this->query_list['group'])?($select_sql.=' group by'.$this->query_list['group']):'';
isset($this->query_list['having'])?($select_sql.=' mysql having '.$this->query_list['having']):'';
isset($this->query_list['order'])?($select_sql.=' order by '.$this->query_list['order']):'';
isset($this->query_list['limit'])?($select_sql.=' '.$this->query_list['limit']):'';
// echo '----->'.$select_sql;
return $this->query($select_sql);
}
/**
+----------------------------------------------------------
* 增加
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param
+----------------------------------------------------------
*/
public function add(){
$add_sql = 'insert into `'.$this->query_list['table'].'` (';
$data = $this->query_list['data'];
$value = $field = '';
foreach($data as $k=>$v){
$field .= '`'.$k.'`,';
if(is_numeric($v))
$value .= $v.',';
else
$value .= '''.$v.'',';
}
$add_sql .= rtrim($field,',').') values ('.rtrim($value,',').')';
// echo 'add_sql'.$add_sql;
return $this->execute($add_sql);
}
/**
+------------------------------------------------- ----------
* Delete
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @param
+------------------------------------------------- ----------
*/
public function delete(){
$del_sql = 'delete from `'.$this->query_list['table'].'` where '.$this->query_list['where'];
if(isset($this->query_list['order']))
$del_sql .= 'order by '.$this->query_list['order'];
if(isset($this->query_list['limit']))
$del_sql .= ' '.$this->query_list['limit'];
return $this->execute($del_sql);
}
/**
+------------------------------------------------- ----------
* Update
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @param
+------------------------------------------------- ----------
*/
public function update(){
$update_sql = 'update `'.$this->query_list['table'].'` set ';
$data = $this->query_list['data'];
foreach($data as $k=>$v){
if(is_numeric($v))
$update_sql .= '`'.$k.'` ='.$v.',';
else
$update_sql .= '`'.$k.'` =''.$v.'',';
}
$update_sql = rtrim($update_sql,',');
if(isset($this->query_list['where']))
$update_sql .= ' where '.$this->query_list['where'];
if(isset($this->query_list['order']))
$update_sql .= ' order by '.$this->query_list['order'];
if(isset($this->query_list['limit']))
$update_sql .= ' '.$this->query_list['limit'];
return $this->execute($update_sql);
}
/**
+------------------------------------------------- ----------
* Execute the query and return the data set
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @param string $sql sql command
*/
public function query($sql) {
if ( !$this->conn ) return false;
$this->queryStr = $sql;
//释放前次的查询结果
if ( $this->queryID ) { $this->free(); }
$this->query_start_time = microtime(true);
$this->queryID = mysql_query($sql, $this->conn);
$this->query_count++;
if ( false === $this->queryID ) {
$this->error();
return false;
} else {
$this->numRows = mysql_num_rows($this->queryID);
return $this->getAll();
}
}
/**
+------------------------------------------------- ----------
* Execution statement
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @param string $sql sql command
+------------------------------------------------- ----------
*/
public function execute($sql) {
if ( !$this->conn ) return false;
$this->queryStr = $sql;
//释放前次的查询结果
if ( $this->queryID ) { $this->free(); }
$this->query_start_time = microtime(true);
$result = mysql_query($sql, $this->conn) ;
$this->query_count++;
if ( false === $result) {
$this->error();
return false;
} else {
$this->numRows = mysql_affected_rows($this->conn);
return $this->numRows;
}
}
/**
+------------------------------------------------- ----------
* Get all query data
+------------------------------------------------- ----------
* @access private
+------------------------------------------------- ----------
* @return array
*/
private function getAll() {
//返回数据集
$result = array();
if($this->numRows >0) {
while($row = mysql_fetch_assoc($this->queryID)){
$result[] = $row;
}
mysql_data_seek($this->queryID,0);
}
return $result;
}
/**
+------------------------------------------------- ----------
* Get the field information of the data table
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
*/
public function getFields($tableName) {
$result = $this->query('SHOW COLUMNS FROM `'.$tableName.'`');
$info = array();
if($result) {
foreach ($result as $key => $val) {
$info[$val['Field']] = array(
'name' => $val['Field'],
'type' => $val['Type'],
'notnull' => (bool) ($val['Null'] === ''), // not null is empty, null is yes
'default' => $val['Default'],
'primary' => (strtolower($val['Key']) == 'pri'),
'autoinc' => (strtolower($val['Extra']) == 'auto_increment'),
);
}
}
return $info;
}
/**
+----------------------------------------------------------
* 取得数据库的表信息
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function getTables($dbName='') {
if(!empty($dbName)) {
$sql = 'SHOW TABLES FROM '.$dbName;
}else{
$sql = 'SHOW TABLES ';
}
$result = $this->query($sql);
$info = array();
foreach ($result as $key => $val) {
$info[$key] = current($val);
}
return $info;
}
/**
+------------------------------------------------- ----------
* The ID of the last operation
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @param
+------------------------------------------------- ----------
*/
public function last_insert_id(){
return mysql_insert_id($this->conn);
}
/**
* Execute a
with result set count
*/
public function count($sql){
return $this->execute($sql);
}
/**
+------------------------------------------------- ----------
* Start transaction
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @return void
+------------------------------------------------- ----------
*/
public function startTrans() {
if ($this->transTimes == 0) {
mysql_query('START TRANSACTION', $this->conn);
}
$this->transTimes++;
return ;
}
/**
+------------------------------------------------- ----------
* Submit transaction
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @return boolen
+------------------------------------------------- ----------
*/
public function commit()
{
if ($this->transTimes > 0) {
$result = mysql_query('COMMIT', $this->conn);
$this->transTimes = 0;
if(!$result){
throw new Exception($this->error());
}
}
return true;
}
/**
+------------------------------------------------- ----------
* *Transaction rollback
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @return boolen
+------------------------------------------------- ----------
*/
public function rollback()
{
if ($this->transTimes > 0) {
$result = mysql_query('ROLLBACK', $this->conn);
$this->transTimes = 0;
if(!$result){
throw new Exception($this->error());
}
}
return true;
}
/**
+------------------------------------------------- ----------
* Error message
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @param
+------------------------------------------------- ----------
*/
public function error() {
$this->error = mysql_error($this->conn);
if('' != $this->queryStr){
$this->error .= "n [ SQL语句 ] : ".$this->queryStr;
}
return $this->error;
}
/**
+------------------------------------------------- ----------
* Release query results
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
*/
public function free() {
@mysql_free_result($this->queryID);
$this->queryID = 0;
$this->query_list = null;
}
/**
+------------------------------------------------- ----------
*Close connection
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @param
+------------------------------------------------- ----------
*/
function close(){
if ($this->conn && !mysql_close($this->conn)){
throw new Exception($this->error());
}
$this->conn = 0;
$this->query_count = 0;
}
/**
+------------------------------------------------- ----------
* Destruction method
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
*/
Function __destruct(){
$this->close();
}
}
// +-------------------------------------------------- -----------------------
// |MySQL operation class
// +-------------------------------------------------- -----------------------
// |@微梁QQ:496928838
// +-------------------------------------------------- -----------------------
class MySQL{
private $db_mysql_hostname;
private $db_mysql_username;
private $db_mysql_password;
private $db_mysql_database;
private $db_mysql_port;
private $db_mysql_charset;
private $query_list = array();
//Number of queries
public $query_count = 0;
//Query start time
public $query_start_time;
//Current query ID
protected $queryID;
//Current connection
protected $conn;
//Number of transaction instructions
protected $transTimes = 0;
//Return or affect the number of records
protected $numRows = 0;
// Error message
protected $error = '';
//Static instance
static private $db_class;
//Get this category
static public function getClass()
{
If (is_null(self::$db_class)) {
self::$db_class=new MySQL();
}
return self::$db_class;
}
//If it is defined as a private method, it will be new. Use getClass
Private function __construct()
{
}
public function connect($hostname_or_conf,$username,$password,$database,$port = '3306',$char = 'utf8'){
if(is_array($hostname_or_conf)){
$this->db_mysql_hostname = $hostname_or_conf['hostname'];
$this->db_mysql_username = $hostname_or_conf['username'];
$this->db_mysql_password = $hostname_or_conf['password'];
$this->db_mysql_database = $hostname_or_conf['database'];
$this->db_mysql_port = isset($hostname_or_conf['port'])?$hostname_or_conf['port']:'3306';
$this->db_mysql_charset = isset($hostname_or_conf['charset'])?$hostname_or_conf['charset']:'utf8';
}elseif(!empty($hostname_or_conf)||!empty($username)||!empty($password)||!empty($database))
{
$this->db_mysql_hostname = $hostname_or_conf;
$this->db_mysql_username = $username;
$this->db_mysql_password = $password;
$this->db_mysql_database = $database;
$this->db_mysql_port = $port;
$this->db_mysql_charset = $char;
}else{
die('configuration error.');
}
$server = $this->db_mysql_hostname.':'.$this->db_mysql_port;
$this->conn = mysql_connect($server,$this->db_mysql_username,$this->db_mysql_password,true) or die('Connect MySQL DB error!');
mysql_select_db($this->db_mysql_database,$this->conn) or die('select db error!');
mysql_query("set names " . $this->db_mysql_charset, $this->conn);
}
/**
+------------------------------------------------- ----------
* Set data object value
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
*table,where,order,limit,data,field,join,group,having
+------------------------------------------------- ----------
*/
public function table($table){
$this->query_list['table'] = $table;
return $this;
}
public function where($where){
$this->query_list['where'] = $where;
return $this;
}
public function order($order){
$this->query_list['order'] = $order;
return $this;
}
public function limit($offset,$length=null){
if (is_null($length)) {
$this->query_list['limit']='limit '.$offset;
return $this;
}else {
if(!isset($length)){
$length = $offset;
$offset = 0;
}
$this->query_list['limit'] = 'limit '.$offset.','.$length;
return $this;
}
}
public function data($data){
//读取数据表字段,然后处理表单数据
$dataList = $this->getFields($this->query_list['table']);
$arr=array();
foreach ($dataList as $key=>$value) {
if (array_key_exists ($key,$data) ) {
$arr[$key]=$data[$key];
}
}
//var_dump($arr);
/*
if(is_object($data)){
$data = get_object_vars($data);
}elseif (is_string($data)){
parse_str($data,$data);
}elseif(!is_array($data)){
//Log:DATA_TYPE_INVALID
}
*/
$this->query_list['data'] = $arr;
return $this;
}
public function field($fields){
$this->query_list['fields'] = $fields;
return $this;
}
public function join($join){
$this->query_list['join'] = $join;
return $this;
}
public function group($group){
$this->query_list['group'] = $group;
return $this;
}
public function having($having){
$this->query_list['having'] = $having;
return $this;
}
/**
+------------------------------------------------- ----------
* Query
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @param
+------------------------------------------------- ----------
*/
public function select(){
$select_sql = 'select ';
$fields = isset($this->query_list['fields'])?$this->query_list['fields']:'*';
$select_sql.=$fields;
$select_sql.= ' from `'.$this->query_list['table'].'` ';
isset($this->query_list['join'])?($select_sql.=$this->query_list['join']):'';
isset($this->query_list['where'])?($select_sql.=' where '.$this->query_list['where']):'';
isset($this->query_list['group'])?($select_sql.=' group by'.$this->query_list['group']):'';
isset($this->query_list['having'])?($select_sql.=' mysql having '.$this->query_list['having']):'';
isset($this->query_list['order'])?($select_sql.=' order by '.$this->query_list['order']):'';
isset($this->query_list['limit'])?($select_sql.=' '.$this->query_list['limit']):'';
// echo '----->'.$select_sql;
return $this->query($select_sql);
}
/**
+------------------------------------------------- ----------
* Add
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @param
+------------------------------------------------- ----------
*/
public function add(){
$add_sql = 'insert into `'.$this->query_list['table'].'` (';
$data = $this->query_list['data'];
$value = $field = '';
foreach($data as $k=>$v){
$field .= '`'.$k.'`,';
if(is_numeric($v))
$value .= $v.',';
else
$value .= '''.$v.'',';
}
$add_sql .= rtrim($field,',').') values ('.rtrim($value,',').')';
// echo 'add_sql'.$add_sql;
return $this->execute($add_sql);
}
/**
+------------------------------------------------- ----------
* Delete
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @param
+------------------------------------------------- ----------
*/
public function delete(){
$del_sql = 'delete from `'.$this->query_list['table'].'` where '.$this->query_list['where'];
if(isset($this->query_list['order']))
$del_sql .= 'order by '.$this->query_list['order'];
if(isset($this->query_list['limit']))
$del_sql .= ' '.$this->query_list['limit'];
return $this->execute($del_sql);
}
/**
+------------------------------------------------- ----------
* Update
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @param
+------------------------------------------------- ----------
*/
public function update(){
$update_sql = 'update `'.$this->query_list['table'].'` set ';
$data = $this->query_list['data'];
foreach($data as $k=>$v){
if(is_numeric($v))
$update_sql .= '`'.$k.'` ='.$v.',';
else
$update_sql .= '`'.$k.'` =''.$v.'',';
}
$update_sql = rtrim($update_sql,',');
if(isset($this->query_list['where']))
$update_sql .= ' where '.$this->query_list['where'];
if(isset($this->query_list['order']))
$update_sql .= ' order by '.$this->query_list['order'];
if(isset($this->query_list['limit']))
$update_sql .= ' '.$this->query_list['limit'];
return $this->execute($update_sql);
}
/**
+------------------------------------------------- ----------
* Execute the query and return the data set
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @param string $sql sql command
*/
public function query($sql) {
if ( !$this->conn ) return false;
$this->queryStr = $sql;
//释放前次的查询结果
if ( $this->queryID ) { $this->free(); }
$this->query_start_time = microtime(true);
$this->queryID = mysql_query($sql, $this->conn);
$this->query_count++;
if ( false === $this->queryID ) {
$this->error();
return false;
} else {
$this->numRows = mysql_num_rows($this->queryID);
return $this->getAll();
}
}
/**
+------------------------------------------------- ----------
* Execution statement
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
* @param string $sql sql command
+------------------------------------------------- ----------
*/
public function execute($sql) {
if ( !$this->conn ) return false;
$this->queryStr = $sql;
//释放前次的查询结果
if ( $this->queryID ) { $this->free(); }
$this->query_start_time = microtime(true);
$result = mysql_query($sql, $this->conn) ;
$this->query_count++;
if ( false === $result) {
$this->error();
return false;
} else {
$this->numRows = mysql_affected_rows($this->conn);
return $this->numRows;
}
}
/**
+------------------------------------------------- ----------
* Get all query data
+------------------------------------------------- ----------
* @access private
+------------------------------------------------- ----------
* @return array
*/
private function getAll() {
//返回数据集
$result = array();
if($this->numRows >0) {
while($row = mysql_fetch_assoc($this->queryID)){
$result[] = $row;
}
mysql_data_seek($this->queryID,0);
}
return $result;
}
/**
+------------------------------------------------- ----------
* Get the field information of the data table
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
*/
public function getFields($tableName) {
$result = $this->query('SHOW COLUMNS FROM `'