自己用PHP封装了一个DB数据库 mysql 的类
jopen
9年前
<?php // 配置数据库 define('DB_HOST', '127.0.0.1'); //服务器地址 define('DB_USER', 'root'); //用户名 define('DB_PASS', ''); //密码 define('DB_DATABASENAME', 'fenxiao'); //数据库 class Dbmysql { /* *变量 **/ private $tablename=""; //表名 private $fieldname="*"; private $conn; private $where; private $sql; function __construct($tablename) { //生成一个连接 $this->conn = mysql_connect(DB_HOST, DB_USER, DB_PASS) or die("connect failed" . mysql_error()); //选择数据库 mysql_select_db(DB_DATABASENAME, $this->conn); //设置编码格式 mysql_query("SET NAMES utf8"); //var_dump($conn); $this->tablename=$tablename; } //设置sql语句 private function setsql($sql) { $this->sql=$sql; } //设置条件语句 public function where($where) { $this->where=" where ".$where; return $this; } //按指定字段 public function field($keyword) { $this->fieldname=$keyword; return $this; } //设置连接查询表 public function table($table1,$table2,$field,$bool) { $this->tablename="$table1 LEFT JOIN $table2 ON $table1.$field$bool$table2.$field"; //print_r($this->tablename); return $this; } //设置多表查询 public function addtable($table1,$table2,$field,$bool) { $this->tablename.=" LEFT JOIN $table2 ON $table1.$field$bool$table2.$field"; //print_r($this->tablename); return $this; } //设置连接查询表 ##SELECT * FROM 【wx_order LEFT JOIN wx_shopcar ON wx_shopcar.oid=wx_order.oid and wx_order.uid=wx_shopcar.uid LEFT JOIN wx_goods ON wx_shopcar.gid=wx_goods.gid】 WHERE wx_order.oid=1 and wx_order.uid=3 public function settable($sql) { $this->tablename=$sql; //print_r($this->tablename); return $this; } //查询所有数据库 以数组形式输出 public function select() { /** * 查询数据库中所有的数据 **/ $arr=array(); //执行sql语句 $result = mysql_query("select ".$this->fieldname." from ".$this->tablename.$this->where, $this->conn); while ($row = mysql_fetch_assoc($result)) { array_push($arr, $row); } return $arr; } //搜索指定字段数据 public function find() { //执行sql语句 $result = mysql_query("select ".$this->fieldname." from ".$this->tablename.$this->where, $this->conn); $result = mysql_fetch_assoc($result); return $result; } //增加数据到数据库 public function add($data) { $keysql=''; $valuesql=''; foreach ($data as $key => $value) { $keysql.=",`$key`"; $valuesql.=",'$value'"; } $keysql=substr($keysql, 1); $valuesql=substr($valuesql, 1); $result=mysql_query("insert into `".$this->tablename."` ($keysql) VALUES($valuesql)"); $id=mysql_insert_id(); //print_r("insert into `".$this->tablename."` ($keysql) VALUES($valuesql)"); return $id; } //修改数据库的内容 public function save($data) { $keysql=''; $valuesql=''; foreach ($data as $key => $value) { $keysql.=",`$key`='$value'"; } $keysql=substr($keysql, 1); //print_r($keysql); //echo "<br>"; $result=mysql_query("UPDATE `".$this->tablename."` SET ".$keysql.$this->where); //print_r("UPDATE `".$this->tablename."` SET ".$keysql.$this->where); return $result; } ##删除数据 public function delete() { $result=mysql_query("DELETE FROM $this->tablename $this->where"); //print_r("DELETE FROM $this->tablename $this->where"); return $result; } } /** * mysql_fetch_row: 返回单列的各字段 [0]=>"111" * mysql_fetch_field: 取得字段信息。[0]=> ['name']=> object * mysql_fetch_array 返回数组资料。 [0]=>"asasds" ['name']=> */ ?>