[php]自己写的一个MySQL数据库操作类_PHP教程

 array(
        //数据库配置
        'DB_HOST'=>'127.0.0.1',    //服务器地址
        'DB_NAME' => 'tmp', // 数据库名
        'DB_USER' => 'root', // 用户名
        'DB_PWD' => '', // 密码
        'DB_ENCODE'=>'utf8',//编码
        'DB_PREFIX' => 'dmtx_' // 数据库表前缀
    )
);
 */
class M
{

    private $link; //数据库连接
    private $table; //表名
    private $prefix; //表前缀
    private $db_config; //数据库配置
    /**
     * 参数:表名 数据库配置数组 或 数据库配置文件路径
     * @param $table
     * @param string $db_config_arr_path
     */
    function __construct($table, $db_config_arr_path = 'config.php')
    {
        if (is_array($db_config_arr_path)) {
            $this->db_config = $db_config_arr_path;
        } else {
            $this->db_config = require($db_config_arr_path);
        }
        $this->conn();
        $this->table = $this->prefix . $table;
    }

    /**
     * 连接数据库
     */
    private function conn()
    {
        $db_config = $this->db_config;
        $host = $db_config["DB_CONFIG"]["DB_HOST"];
        $user = $db_config["DB_CONFIG"]["DB_USER"];
        $pwd = $db_config["DB_CONFIG"]["DB_PWD"];
        $db_name = $db_config["DB_CONFIG"]["DB_NAME"];
        $db_encode = $db_config["DB_CONFIG"]["DB_ENCODE"];
        $this->prefix = $db_config["DB_CONFIG"]["DB_PREFIX"];

        $this->link = mysql_connect($host, $user, $pwd) or die('数据库服务器连接错误:' . mysql_error());
        mysql_select_db($db_name) or die('数据库连接错误:' . mysql_error());
        mysql_query("set names '$db_encode'");
    }

    /**
     * 数据查询
     * 参数:sql条件 查询字段 使用的sql函数名
     * @param string $where
     * @param string $field
     * @param string $fun
     * @return array
     * 返回值:结果集 或 结果(出错返回空字符串)
     */
    public function select($where = '1', $field = "*", $fun = '')
    {
        $rarr = array();
        if (empty($fun)) {
            $sqlStr = "select $field from $this->table where $where";
            $rt = mysql_query($sqlStr, $this->link);
            while ($rt && $arr = mysql_fetch_assoc($rt)) {
                array_push($rarr, $arr);
            }
        } else {
            $sqlStr = "select $fun($field) as rt from $this->table where $where";
            $rt = mysql_query($sqlStr, $this->link);
            if ($rt) {
                $arr = mysql_fetch_assoc($rt);
                $rarr = $arr['rt'];
            } else {
                $rarr = '';
            }
        }
        return $rarr;
    }

    /**
     * 数据更新
     * 参数:sql条件 要更新的数据(字符串 或 关联数组)
     * @param $where
     * @param $data
     * @return bool
     * 返回值:语句执行成功或失败,执行成功并不意味着对数据库做出了影响
     */
    public function update($where, $data)
    {
        $ddata = '';
        if (is_array($data)) {
            while (list($k, $v) = each($data)) {
                if (empty($ddata)) {
                    $ddata = "$k='$v'";

                } else {
                    $ddata .= ",$k='$v'";
                }
            }
        } else {
            $ddata = $data;
        }
        $sqlStr = "update $this->table set $ddata where $where";
        return mysql_query($sqlStr);
    }

    /**
     * 数据添加
     * 参数:数据(数组 或 关联数组 或 字符串)
     * @param $data
     * @return int
     * 返回值:插入的数据的ID 或者 0
     */
    public function insert($data)
    {
        $field = '';
        $idata = '';
        if (is_array($data) && array_keys($data) != range(0, count($data) - 1)) {
            //关联数组
            while (list($k, $v) = each($data)) {
                if (empty($field)) {
                    $field = "$k";
                    $idata = "'$v'";
                } else {
                    $field .= ",$k";
                    $idata .= ",'$v'";
                }
            }
            $sqlStr = "insert into $this->table($field) values ($idata)";
        } else {
            //非关联数组 或字符串
            if (is_array($data)) {
                while (list($k, $v) = each($data)) {
                    if (empty($idata)) {
                        $idata = "'$v'";
                    } else {
                        $idata .= ",'$v'";
                    }
                }

            } else {
                //为字符串
                $idata = $data;
            }
            $sqlStr = "insert into $this->table values ($idata)";
        }
        if(mysql_query($sqlStr,$this->link))
        {
            return mysql_insert_id($this->link);
        }
        return 0;
    }

    /**
     * 数据删除
     * 参数:sql条件
     * @param $where
     * @return bool
     */
    public function delete($where)
    {
        $sqlStr = "delete from $this->table where $where";
        return mysql_query($sqlStr);
    }

    /**
     * 关闭MySQL连接
     * @return bool
     */
    public function close()
    {
        return mysql_close($this->link);
    }

}


//$hj = new M("user");
//echo $hj->insert("NULL,'hj.q@qq.com','cde'");
//$arr = $hj->select();
//print_r($arr);
//echo $hj->update("id>3",array("email"=>"bn@c.cc"));

insert(array("NULL","1@qq.com","xxx"));
echo $hj->insert(array("email"=>"12@qq.com","password"=>"cccc"));
echo $hj->insert("NULL,'123@qq.com','cde'");

//查
//查看所有数据
$arr = $hj->select();
print_r($arr);
//查看id大于3且id小于6 的id 和email 字段 的所有数据
$arr = $hj->select("id>3 and id<6","id,email");
print_r($arr);
//获取数据库中一共有多少条记录
$rt = $hj->select("1","*","count");
echo $rt;

// 改
$b = $hj->update("id=1","email = '1234@qq.com'");
echo $b;
$b = $hj->update("id>3 and id<6",array("email"=>"1234@qq.com"));
echo $b;

// 删
$b = $hj->delete("id>3");
echo $b;

//关闭
$hj->close();

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