PHP add, delete, modify, check package

php add, delete, modify and check encapsulation

First create a class named "DB"; then in the constructor of the "DB" class Connect to the database; then write additions, deletions, modifications and queries based on the connection instance; finally instantiate the "DB" class and set it as a global variable.

Encapsulation code:

<?php
/**
 * 数据库配置信息
 */
define(&#39;DB_HOST&#39;,&#39;127.0.0.1&#39;);            //服务器
define(&#39;DB_USER&#39;,&#39;root&#39;);                 //数据库用户名
define(&#39;DB_PASSWORD&#39;,&#39;123456&#39;);           //数据库密码
define(&#39;DB_NAME&#39;,&#39;TEST&#39;);                 //默认数据库
define(&#39;DB_CHARSET&#39;,&#39;utf8&#39;);              //数据库字符集
define(&#39;TIMEZONE&#39;,"PRC");                 //时区设置
date_default_timezone_set(TIMEZONE);
/**
 * 类名：DB
 * 说明：数据库操作类
 */
class DB
{
    public $host;            //服务器

    public $conn;            //数据库连接变量
    /**
     * DB类构造函数
     */
    public function DB($host=DB_HOST ,$username=DB_USER,$password=DB_PASSWORD,$db_name=DB_NAME)
    {
        $this->host = $host;
        $this->username = $username;
        $this->password = $password;
        $this->db_name = $db_name;

       $this->conn = mysql_connect($host,$username,$password) or die (&#39;数据库连接失败！错误原因：&#39;.mysql_error());

        mysql_select_db($db_name)or die(&#39;数据库选定失败！错误原因：&#39;.mysql_error());
        
        mysql_query("SET CHARACTER SET utf8");
    }

    /**
     * 关闭数据连接
     */
    public function close()
    {
        mysql_close($this->conn);
    }

    /**
     * @description调用方法用
     * @param $sql
     * @return array
     */
    public function QueryAll($sql)
    {
        $this->open();
        $rs = mysql_query($sql,$this->conn);
        $objList = array();
        while($obj = mysql_fetch_object($rs))
        {
            if($obj)
            {
                $objList[] = $obj;
            }
        }
        $this->close();
        return $objList;
    }
    /**
     * description查询全部返回Json格式，通讯用
     * @param $sql
     * @return string
     */
    public function QueryAllJson($sql)
    {
        echo $sql;
        $this->open();
        $rs = mysql_query($sql,$this->conn);
        $objList = array();
        $i=0;
        while($obj = mysql_fetch_object($rs))
        {
            $objList[$i]=$obj;
            $i++;
        }
        $this->close();
        return json_encode(array("result"=>"success",&#39;data&#39;=>$objList));
    }
    /**
     * @description 插入数据到数据库中
     * @param $tableName 表名
     * @param array $columns 包含表中所有字段名的数组。默认空数组，则是全部有序字段名
     * @param array $values  包含对应所有字段的属性值的数组
     * @return int
     */
    public function insertData($tableName,$columns=array(),$values=array())
    {
        $sql = &#39;insert into &#39;.$tableName .&#39;( &#39;;
        for($i = 0; $i < sizeof($columns);$i ++)
        {
            $sql .= $columns[$i];
            if($i < sizeof($columns) - 1)
            {
                $sql .= &#39;,&#39;;
            }
        }
        $sql .= &#39;) values ( &#39;;
        for($i = 0; $i < sizeof($values);$i ++)
        {
            $sql .= "&#39;".$values[$i]."&#39;";
            if($i < sizeof($values) - 1)
            {
                $sql .= &#39;,&#39;;
            }
        }
        $sql .= &#39; )&#39;;
        $this->open();
        mysql_query($sql,$this->conn);
        return true;
//      $id = mysql_insert_id($this->conn);//取得上一步操作产生的ID(2)
//      $this->close();(2)
//      return $id;//(2)
    }
    /**
     * 通过表中的某一属性获取数据
     */
    public function getDataByAtr($tableName,$atrName,$atrValue){
        @$data = $this->QueryAll("SELECT * FROM ".$tableName." WHERE $atrName = &#39;$atrValue&#39;");
        if(count($data)!=0)return $data;
        return NULL;
    }
    /**
     * description_
     * 通过表中的"id"，删除记录
     */
    public function delete($tableName,$atrName,$atrValue){
        echo $tableName;
        $this->open();
        $deleteResult = false;
        if(mysql_query("DELETE FROM ".$tableName." WHERE $atrName = &#39;$atrValue&#39;")) $deleteResult = true;
        $this->close();
        if($deleteResult) return true;
        else return false;
    }
    /**
     * 更新表中的属性值
     */
    public function updateParamById($tableName,$atrName,$atrValue,$key,$value){
        $db = new DB();
        $db->open();
        if(mysql_query("UPDATE ".$tableName." SET $key = &#39;$value&#39; WHERE $atrName = &#39;$atrValue&#39; ")){  //$key不要单引号
            $db->close();
            return true;
        }
        else{
            $db->close();
            return false;
        }
    }
    /*
     * @description: 取得一个table的所有属性名
     * @param: $tbName 表名
     * @return：字符串数组
     */
    public function fieldName($tableName){
        $resultName=array();
        $i=0;
        $this->open();
        $result = mysql_query("SELECT * FROM ".$tableName);
        while ($property = mysql_fetch_field($result)){
            $resultName[$i++]=$property->name;
        }
        $this->close();
        return $resultName;
    }

}

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