[php]自己写的一个MySQL数据库操作类_PHP教程

自己练练手，写一个一个功能比较简单的MySQL数据库操作类

<?php
/**
 * Created by JetBrains PhpStorm.
 * User:JAE
 * Date: 13-8-13
 * Time: 下午5:15
 * Blog:http://blog.jaekj.com
 * QQ:734708094
 * 通用数据库操作类
 * 版本:V1.1
 */

/* 数据库配置
  return array(
    &#39;DB_CONFIG&#39; => array(
        //数据库配置
        &#39;DB_HOST&#39;=>&#39;127.0.0.1&#39;,    //服务器地址
        &#39;DB_NAME&#39; => &#39;tmp&#39;, // 数据库名
        &#39;DB_USER&#39; => &#39;root&#39;, // 用户名
        &#39;DB_PWD&#39; => &#39;&#39;, // 密码
        &#39;DB_ENCODE&#39;=>&#39;utf8&#39;,//编码
        &#39;DB_PREFIX&#39; => &#39;dmtx_&#39; // 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, $db_config_arr_path = &#39;config.php&#39;)
    {
        if (is_array($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, $pwd) or die(&#39;数据库服务器连接错误:&#39; . mysql_error());
        mysql_select_db($db_name) or die(&#39;数据库连接错误:&#39; . mysql_error());
        mysql_query("set names &#39;$db_encode&#39;");
    }

    /**
     * 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 = &#39;1&#39;, $field = "*", $fun = &#39;&#39;)
    {
        $rarr = array();
        if (empty($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[&#39;rt&#39;];
            } else {
                $rarr = &#39;&#39;;
            }
        }
        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)
    {
        $ddata = &#39;&#39;;
        if (is_array($data)) {
            while (list($k, $v) = each($data)) {
                if (empty($ddata)) {
                    $ddata = "$k=&#39;$v&#39;";

                } else {
                    $ddata .= ",$k=&#39;$v&#39;";
                }
            }
        } 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 = &#39;&#39;;
        $idata = &#39;&#39;;
        if (is_array($data) && array_keys($data) != range(0, count($data) - 1)) {
            //关联数组
            while (list($k, $v) = each($data)) {
                if (empty($field)) {
                    $field = "$k";
                    $idata = "&#39;$v&#39;";
                } else {
                    $field .= ",$k";
                    $idata .= ",&#39;$v&#39;";
                }
            }
            $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)) {
                        $idata = "&#39;$v&#39;";
                    } else {
                        $idata .= ",&#39;$v&#39;";
                    }
                }

            } 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 $hj->insert("NULL,&#39;hj.q@qq.com&#39;,&#39;cde&#39;");
//$arr = $hj->select();
//print_r($arr);
//echo $hj->update("id>3",array("email"=>"bn@c.cc"));

<?php

require &#39;Query/M.class.php&#39;;

$hj = new M("user");
//增
echo $hj->insert(array("NULL","1@qq.com","xxx"));
echo $hj->insert(array("email"=>"12@qq.com","password"=>"cccc"));
echo $hj->insert("NULL,&#39;123@qq.com&#39;,&#39;cde&#39;");

//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 = &#39;1234@qq.com&#39;");
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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