The second day of php practice_PHP tutorial

1. I wrote the add method on my message board

[php] function add(){
//After adding, return the number of affected items. If it is greater than 0, it means the addition is successful
If($this->db->data($_POST)->add()>0){
            echo "Added successfully";
// echo "<script>location.reload()</script>";//Prevent repeated submission of the refreshed form
Header("HTTP/1.1 303 See Other");
        Header("Location: "); //Redirect to the root directory
exit;
                                                        }else {
            die($this->db->error());//Add failure output error message
}  
}

function add(){

//After adding, return the number of affected items. If it is greater than 0, it means the addition is successful
If($this->db->data($_POST)->add()>0){
echo "Added successfully";
//echo "<script>location.reload()</script>";//Prevent repeated submission of the refreshed form
Header("HTTP/1.1 303 See Other");
Header("Location: "); //Redirect to the root directory
exit;
 
}else {
Die($this->db->error());//Add failure output error message
}  
}Corresponding submission form

[html]  <div class="center"> 
    <form action="?m=index&a=add" method="post"> 
        <table border=0> 
                        <tr> 
                            <td>用户名</td> 
                            <td><input type="text" name="userName" value="admin"></td> 
                        </tr> 
                        <tr> 
                            <td>留言内容</td> 
                            <td><textarea rows="3" cols="20" name="content">aaaaa</textarea></td> 
                        </tr> 
                        <tr> 
                            <td>电子邮箱</td> 
                            <td>email:<input type="text" name="email" value="admin@admin.com"></td> 
                        </tr> 
                        <tr> 
                            <td></td> 
                            <td><input type="submit" name="submit" value="留言"></td> 
                        </tr> 
        </table> 
             
                    <input type="hidden" name="action" value="add"> 
                </form> 
            </div> 
</div> 

<div class="center">
 <form action="?m=index&a=add" method="post">
   <table border=0>
                        <tr>
                            <td>用户名</td>
                            <td><input type="text" name="userName" value="admin"></td>
                        </tr>
                        <tr>
                            <td>留言内容</td>
                            <td><textarea rows="3" cols="20" name="content">aaaaa</textarea></td>
                        </tr>
                        <tr>
                            <td>电子邮箱</td>
                            <td>email:<input type="text" name="email" value="admin@admin.com"></td>
                        </tr>
                        <tr>
                            <td></td>
                            <td><input type="submit" name="submit" value="留言"></td>
                        </tr>
  </table>
           
                    <input type="hidden" name="action" value="add">
                </form>
   </div>
</div>

2. Modified the MYSQL operation class so that data automatically processes the passed data, compares whether the field exists, and does not add it if it does not exist.

[php] <?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 = '';
       
Public function __construct($hostname_or_conf,$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.');
         } 
$this->connect();
}  
       
private function connect(){
$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){ 
        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']):''; 
         
        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;
//Release the previous query results
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;
//Release the previous query results
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() {
//Return the data set
         $result = array();
If($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 $info; 
    } 
    /**
+------------------------------------------------- ----------
* Get database table information
+------------------------------------------------- ----------
* @access public
+------------------------------------------------- ----------
​​*/ 
    public function getTables($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; 
    } 
 
    /**
     +----------------------------------------------------------
     * 最后次操作的ID
     +----------------------------------------------------------
     * @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(); 
    } 
} 

<?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 = '';

public function __construct($hostname_or_conf,$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.');
}
$this->connect();
}

private function connect(){
$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){
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']):'';
  
  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 &g