Home>Article>Backend Development> Encapsulation and use of PHP database classes
The content of this article is about the encapsulation and use of PHP database classes. It has certain reference value. Now I share it with everyone. Friends in need can refer to it
封装类
'localhost','port' => '3306'); */ public function __construct($arr = array()){ //初始化 $this->host = isset($arr['host']) ? $arr['host'] : 'localhost';//先判断是否有自己的host,如果有就用自己的host,否则就使用默认的localhost $this->port = isset($arr['port']) ? $arr['port'] : '3306'; $this->user = isset($arr['user']) ? $arr['user'] : 'root'; $this->pass = isset($arr['pass']) ? $arr['pass'] : 'czyyzb'; $this->dbname = isset($arr['dbname']) ? $arr['dbname'] : 'mydb'; $this->charset = isset($arr['charset']) ? $arr['charset'] : 'utf8'; $this->prefix = isset($arr['prefix']) ? $arr['prefix'] : ''; //连接数据库(类是要操作数据库,因此要连接数据库) $this->connect(); //设置字符集 $this->setCharset(); //选择数据库 $this->setDbname(); } /* * 连接数据库 */ private function connect(){ //mysql扩展连接 $this->link = mysql_connect($this->host . ':' . $this->port,$this->user,$this->pass); //判断结果 if(!$this->link){ //结果出错了 //暴力处理,如果是真实线上项目(生产环境)必须写入到日志文件 echo '数据库连接错误:
'; echo '错误编号' . mysql_errno() . '
'; echo '错误内容' . mysql_error() . '
'; exit; } } /* * 设置字符集 */ private function setCharset(){ //设置 $this->db_query("set names {$this->charset}"); } /* * 选择数据库 */ private function setDbname(){ $this->db_query("use {$this->dbname}"); } /* * 增加数据 * @param1 string $sql,要执行的插入语句 * @return boolean,成功返回是自动增长的ID,失败返回FALSE */ public function db_insert($sql){ //发送数据 $this->db_query($sql); //成功返回自增ID return mysql_affected_rows() ? mysql_insert_id() : FALSE; } /* * 删除数据 * @param1 string $sql,要执行的删除语句 * @return Boolean,成功返回受影响的行数,失败返回FALSE */ public function db_delete($sql){ //发送SQL $this->db_query($sql); //判断结果 return mysql_affected_rows() ? mysql_affected_rows() : FALSE; } /* * 更新数据 * @param1 string $sql,要执行的更新语句 * @return Boolean,成功返回受影响的行数,失败返回FALSE */ public function db_update($sql){ //发送SQL $this->db_query($sql); //判断结果 return mysql_affected_rows() ? mysql_affected_rows() : FALSE; } /* * 查询:查询一条记录 * @param1 string $sql,要查询的SQL语句 * @return mixed,成功返回一个数组,失败返回FALSE */ public function db_getRow($sql){ //发送SQL $res = $this->db_query($sql); //判断返回 return mysql_num_rows($res) ? mysql_fetch_assoc($res) : FALSE; } /* * 查询:查询多条记录 * @param1 string $sql,要查询的SQL语句 * @return mixed,成功返回一个二维数组,失败返回FALSE */ public function db_getAll($sql){ //发送SQL $res = $this->db_query($sql); //判断返回 if(mysql_num_rows($res)){ //循环遍历 $list = array(); //遍历 while($row = mysql_fetch_assoc($res)){ $list[] = $row; } //返回 return $list; } //返回FALSE return FALSE; } /* * mysql_query错误处理 * @param1 string $sql,需要执行的SQL语句 * @return mixed,只要语句不出错,全部返回 */ private function db_query($sql){ //发送SQL $res = mysql_query($sql); //判断结果 if(!$res){ //结果出错了 //暴力处理,如果是真实线上项目(生产环境)必须写入到日志文件 echo '语句出现错误:
'; echo '错误编号' . mysql_errno() . '
'; echo '错误内容' . mysql_error() . '
'; exit; } //没有错误 return $res; } //__sleep方法 public function __sleep(){ //返回需要保存的属性的数组 return array('host','port','user','pass','dbname','charset','prefix'); } //__wakeup方法 public function __wakeup(){ //连接资源 $this->connect(); //设置字符集和选中数据库 $this->setCharset(); $this->setDbname(); } /* * 获取完整的表名 */ protected function getTableName(){ //完整表名:前缀+表名 return $this->prefix . $this->table; } } ?>
使用
php
header("Content-type: text/html; charset=utf-8"); include("conn.php"); //实例化 $con = new DB(array('dbname' => 'oilmis_wh')); $sql = "SELECT * FROM stock "; $arr = $con ->db_getAll($sql);
?>//这个DB类,一般不写析构(不释放资源)
Related recommendations:
Very useful PHP database class php database class is suitable for mysql sql serviceThe above is the detailed content of Encapsulation and use of PHP database classes. For more information, please follow other related articles on the PHP Chinese website!