自定义MVC框架之工具类-模型类

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自定义MVC框架之工具类-分页类的封装

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这个模型类支持以下功能：

>连贯操作，js叫链式操作，连贯操作的函数可以打乱顺序，最后一个函数必须是执行语句的那个函数，如select, delete, update, add等

如 $db->table( 'user' )->where( 'id=1' )->select()

等等

->支持扩展各种子类模型，命名如: UserModel, 也可以用其他方式的，跟表名称不同的Model命名，如MyUserModel等

 <?php

 class Model {
     protected $dbHost; //主机
     protected $dbUser; //用户名
     protected $dbPwd; //密码
     protected $dbName; //数据库名

     protected $prefix; //表前缀
     protected $tbName; //表名称
     protected $charset; //字符集
     protected $link; //数据库连接资源
     protected $sql; //拼接的sql语句
     protected $options; //sql查询条件

     public function __construct( $config ){
         $this->dbHost = $config['db_host'];
         $this->dbUser = $config['db_user'];
         $this->dbPwd = $config['db_pwd'];
         $this->dbName = $config['db_name'];
         $this->prefix = $config['prefix'];
         $this->charset = $config['charset'];

         $this->link = $this->connect();

         $this->tbName = $this->getTableName();

         $this->initOptions();
     }

     protected function initOptions(){
         $sqlKey = [ 'where', 'group', 'having', 'limit', 'order', 'field', 'table' ];
         foreach ( $sqlKey as $key => $value ) {
             $this->options[$value] = '';
             if( $value == 'table' ) {
                 $this->options[$value] = $this->tbName;
             }
         }
     }

     public function table( $tbName ) {
         if( !empty( $tbName ) ) {
             $this->options['table'] = $tbName;
         }
         return $this;
     }

     public function limit( $limit ){
         if( !empty( $limit ) ) {
             if( is_string( $limit ) ) {
                 $this->options['limit'] = 'limit ' . $limit;
             }else if ( is_array( $limit ) ) {
                 $this->options['limit'] = 'limit ' . join( ',', $limit );
             }
         }
         return $this;
     }

     public function order( $order ){
         if( !empty( $order ) ) {
             $this->options['order'] = 'order by ' . $order;
         }
         return $this;
     }

     public function having( $having ){
         if( !empty( $group ) ) {
             $this->options['having'] = 'having ' . $having;
         }
         return $this;
     }

     public function group( $group ){
         if( !empty( $group ) ) {
             $this->options['group'] = 'group by ' . $group;
         }
         return $this;
     }

     public function where( $where ){
         if( !empty( $where ) ) {
             $this->options['where'] = 'where ' . $where;
         }
         return $this;
     }

     public function field( $fields ){
         if( !empty( $fields ) ) {
             if( is_string( $fields ) ) {
                 $this->options['field'] = $fields;
             }else if( is_array( $fields ) ){
                 $this->options['field'] = join( ',', $fields );
             }
         }
         return $this;
     }

     public function getTableName(){
         if( !empty( $this->tbName ) ) {
             return $this->prefix . $this->tbName;
         }
         $className = get_class( $this );
         //UserModel GoodsModel, 获取Model前面的字符串(就是表名称)
         $tbName = strtolower( substr( $className, , - ) );
         return $this->prefix . $this->tbName;
     }

     protected function connect(){
         $link = mysql_connect( $this->dbHost, $this->dbUser, $this->dbPwd );
         if( !$link ){
             die( "mysql数据库连接失败:" .  mysql_error() );
         }
         mysql_select_db( $this->dbName, $link );
         mysql_query( $this->charset );
         return $link;
     }

     public function select(){
         $sql = 'SELECT %FIELD% FROM %TABLE% %WHERE% %GROUP% %HAVING% %ORDER% %LIMIT%';
         $sql = str_replace(
             ['%FIELD%', '%TABLE%', '%WHERE%', '%GROUP%', '%HAVING%', '%ORDER%', '%LIMIT%'],
             [ $this->options['field'], $this->options['table'], $this->options['where'], $this->options['group'], $this->options['having'], $this->options['order'], $this->options['limit'] ],
             $sql
         );
         $this->sql = $sql;
         return $this->query( $sql );
     }

     public function __get( $key ){
         if( $key == 'sql' ) {
             return $this->sql;
         }else if( $key == 'prefix' ) {
             return $this->prefix;
         }
         return false;
     }

     public function query( $sql ){
         //执行语句之前，清空原来的options保存的sql语句临时拼接数据
         $this->initOptions();
         $res = mysql_query( $sql );
         $data = array();
         if( $res && mysql_num_rows( $res ) ) {
             while( $row = mysql_fetch_assoc( $res ) ){
                 $data[] = $row;
             }
         }
         return $data;
     }

     public function add( $data ){
         $data = $this->parse( $data );
         $keys = array_keys( $data );
         $values = array_values( $data );
         $sql = 'INSERT INTO %TABLE%(%FIELD%) values(%VALUES%)';
         $sql = str_replace(
             [ '%TABLE%', '%FIELD%', '%VALUES%' ],
             [ $this->options['table'], join( ',', $keys ), join( ',', $values ) ],
             $sql
         );
         $this->sql = $sql;
         return $this->exec( $sql, true );
     }

     public function delete(){
         $sql = 'DELETE FROM %TABLE% %WHERE%';
         $sql = str_replace(
             [ '%TABLE%', '%WHERE%' ],
             [ $this->options['table'], $this->options['where'] ],
             $sql
         );
         $this->sql = $sql;
         return $this->exec( $sql );
     }

     public function exec( $sql, $isInsert = false ){
         $this->initOptions();
         $res = mysql_query( $sql );
         if( $res !== false ) {
             if( $isInsert ) {
                 return mysql_insert_id();
             }else {
                 return mysql_affected_rows();
             }
         }
         return false;
     }

     public function parse( $data ) {
         $res = [];
         foreach( $data as $k => $v ){
             if( is_string( $v ) ) {
                 $res[$k] = '"' . $v . '"';
             }
         }
         return $res;
     }

     public function update( $data ) {
         $data = $this->parse( $data );
         $fieldValue = $this->format( $data );
         $sql = 'UPDATE %TABLE% SET %FIELD% %WHERE%';
         $sql = str_replace(
             [ '%TABLE%', '%FIELD%', '%WHERE%' ],
             [ $this->options['table'], $fieldValue, $this->options['where'] ],
             $sql
         );
         $this->sql = $sql;
         return $this->exec( $sql );
     }

     //update ghostwu_user set field = value, where ....
     protected function format( $data ){
         $res = [];
         foreach( $data as $k => $v ) {
             $res[] = $k . '=' . $v;
         }
         return join( ',', $res );
     }

     public function __destruct(){
         mysql_close( $this->link );
     }

     public function __call( $funcName, $args ) {
         $str = substr( $funcName, ,  );
         $field = substr( $funcName,  );
         if( $str == 'getBy' ) {
                 echo $args[];
             return $this->where( $field . '="' . $args[] . '"' )->select();
         }
         return false;
     }
 }
 $config = [
     'db_host' => 'localhost',
     'db_user' => 'root',
     'db_pwd' => '',
     'prefix' => 'ghostwu_',
     'db_name' => 'blog',
     'charset' => 'utf8',
 ];
 $db = new Model( $config );
 print_r( $db->field( '*' )->table( $db->prefix . 'users' )->getByName( 'zhangsan' ) );
 echo $db->sql . PHP_EOL;
 //$db->table( $db->prefix . 'users' )->where( 'id=1' )->update( [ 'name' => 'david', 'email' => 'david@gmail.com' ] );
 //echo $db->sql . PHP_EOL;
 //$db->table( $db->prefix . 'users' )->where( 'id in( 4, 5, 6, 7 )' )->delete();
 //echo $db->sql . PHP_EOL;
 //$db->table( $db->prefix . 'users' )->add( ['name' => 'zhangsan', 'email' => 'test@test.com'] );
 /*
 $list = $db->table( $db->prefix . 'users' )->field( [ 'name', 'email' ] )->where( 'id >= 1' )->order( 'id desc' )->limit( [0, 5] )->select();
 echo $db->sql . PHP_EOL;
 print_r( $list );
  */
 ?>