浅谈php值mysql操作类
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<?php
/**
* created by phpstorm.
* user: administrator
* date: 2016/6/27
* time: 18:55
*/
class mysqls{
private $table; //表
private $opt;
public function __construct($host,$user,$pwd,$name,$table_names)
{
$this->db=new mysqli($host,$user,$pwd,$name); //数据库连接
if(mysqli_connect_errno()){
echo "数据库连接错误".mysqli_connect_errno();
exit();
}
$this->db->query("set names utf8");
$this->table=$table_names;
$this->opt['field']="*";
$this->opt['where']=$this->opt['order']=$this->opt['limit']=$this->opt['group']='';
// var_dump($this->opt['where']);
//$this->m($table_names);
}
//数据库连接
// protected function m($table_name){
// $this->db=new mysqli(dbhost,dbuser,dbpwd,dbname);
//
// if(mysqli_connect_errno()){
// echo "数据库连接错误".mysqli_connect_errno();
// exit();
// }
// $this->db->query("set names utf8");
// $this->table=$table_name;
// }
//表中的字段
public function tbfield(){
$desc=$this->db->query("desc {$this->table}");
$fieldarr=array();
while(($row=$desc->fetch_assoc())!=false){
$fieldarr[]=$row['field'];
}
// var_dump($fieldarr);
return $fieldarr;
}
//查询字段
public function field($filed){
//拆分字段
$filedarr=is_string($filed)?explode(",",$filed):$filed;
if(is_array($filedarr)){
$filed='';
foreach($filedarr as $v){
$filed.="'".$v."'".",";
}
}
//var_dump($filed);
return rtrim($filed,",");
}
//判断字段是否存在
public function isfield($fileds)
{
$filedarr=is_string($fileds)?explode(",",$fileds):$fileds;
$tbfiled=$this->tbfield();
//var_dump( $tbfiled);
foreach($filedarr as $v){
if(!in_array($v,$tbfiled)){
echo "字段输入发错";
}
}
}
//条件语句
public function where($where){
$this->opt['where']=is_string($where)?" where {$where}":"不是字符串";
return $this;
}
//limit
public function limit($limit){
$this->opt['limit']=is_string($limit)?" limit {$limit}":"不是字符串";
return $this;
}
public function order($order){
$this->opt['order']=is_string($order)?" order by {$order}":"不是字符串";
return $this;
}
public function group($group){
$this->opt['group']=is_string($group)?" group by {$group}":"不是字符串";
return $this;
}
// 查询字符串
public function select(){
$sql="select * from {$this->table} {$this->opt['where']} {$this->opt['group']} {$this->opt['limit']} {$this->opt['order']}";
return $this->fetch($sql);
}
//结果集查询
public function fetch($sql){
$result=$this->db->query($sql);
$sqlarr=array();
while(($row=$result->fetch_assoc())!=false){
$sqlarr[]=$row;
}
// var_dump($sqlarr);
return $sqlarr;
}
//无结果集查询
public function querys($sql){
$sqls=$this->db->query($sql);
return $this->db->affected_rows;
}
//删除语句
public function delete($where=array()){
if($where=="" && empety($this->opt['where'])) die(" 不能为空");
if($where!=""){
if(is_array($where)){
$where=implode(",",$where);
}
$this->opt['where']=" where id in({$where})";
}
$sql="delete from {$this->table} {$this->opt['where']} {$this->opt['limit']}";
var_dump($sql);
//return $this->query($sql);
}
//数组键名
public function key($key){
if(!is_array($key))die("非法数组");
$keys="";
foreach($key as $v){
$keys.=$v.",";
}
return rtrim($keys,",");
}
//数组值
public function value($value){
if(!is_array($value))die("非法数组");
$strvalue="";
foreach($value as $v){
$strvalue.="'".$v."'".",";
}
return rtrim($strvalue,",");
}
//添加语句
public function add($filed){
if(!is_array($filed)) die("非法数组");
$fileds=$this->key(array_keys($filed)); //返回数组中的键名
//var_dump($fileds);
$values=$this->value(array_values($filed));
$sql="insert into {$this->table}({$fileds})values($values)";
//var_dump($sql);
return $this->querys($sql);
}
//查找单条记录
public function find($field,$id){
$sql="select {$this->opt['field']} from {$this->table} {$this->where($field.'='."'".$id."'")}";
var_dump($sql);
return $this->fetch($sql);
}
//更新语句
public function save($arrs){
if(!is_array($arrs))die("非法的数组");
//if(empty($this->opt['where']))die("条件不能为空");
$str="";
while(list($k,$v)=each($arrs))
{
$str="{$k}="."'{$v}',";
}
$str=rtrim($str,",");
$sql="update {$this->table} set {$str}{$this->opt['where']}";
return $this->querys($sql);
}
//获取总记录数
public function counts(){
$sql="select 'id' from {$this->table}{$this->opt['where']}";
//var_dump($sql);
return $this->querys($sql);
}
}
$db=new mysqls('127.0.0.1','root','','mysql','user');
写的一部分有问题 参考了别人一部分。
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