_initialize();
if(!isset($host)||!isset($user)||!isset($passowrd)||!isset($database)){
return false;
}else{
$this->_host = $host;
$this->_user = $user;
$this->_password = $passowrd;
$this->_database = $database;
$this->_port = $port;
$_dbObj = new mysqli($host,$user,$passowrd,$database,$port);
if($_dbObj->connect_errno){
$this->error = $_dbObj->connect_error;
return false;
}else{
$this->_dbObj = $_dbObj;
return $this;
}
}
}
/**
* 错误信息函数
* 返回数据库操作过程中最后一次执行时的错误信息
* @access public
* @return mixed 数据库连接错误信息(正常返回'')
*/
public function error(){
return $this->error;
}
// 回调方法 初始化模型
protected function _initialize() {}
/**
* 设置数据对象的值
* @access public
* @param string $name 名称
* @param mixed $value 值
* @return void
*/
public function __set($name,$value) {
// 设置数据对象属性
$this->data[$name] = $value;
}
/**
* 获取数据对象的值
* @access public
* @param string $name 名称
* @return mixed
*/
public function __get($name) {
return isset($this->data[$name])?$this->data[$name]:null;
}
/**
* 检测数据对象的值
* @access public
* @param string $name 名称
* @return boolean
*/
public function __isset($name) {
return isset($this->data[$name]);
}
/**
* 销毁数据对象的值
* @access public
* @param string $name 名称
* @return void
*/
public function __unset($name) {
unset($this->data[$name]);
}
/**
* 利用__call方法实现一些特殊的方法(对于调用类中不存在方法的解决方案)
* @access public
* @param string $method 方法名称
* @param array $args 调用参数
* @return mixed
*/
public function __call($method,$args) {
/*if(in_array(strtolower($method),$this->methods,true)) {
// 连贯操作的实现
$this->options[strtolower($method)] = $args[0];
return $this;
}elseif(in_array(strtolower($method),array('count','sum','min','max','avg'),true)){
// 统计查询的实现
$field = isset($args[0])?$args[0]:'*';
return ;
}elseif(strtolower(substr($method,0,5))=='getby') {
// 根据某个字段获取记录
$field = parse_name(substr($method,5));
$where[$field] = $args[0];
return ;
}elseif(strtolower(substr($method,0,10))=='getfieldby') {
// 根据某个字段获取记录的某个值
$name = parse_name(substr($method,10));
$where[$name] =$args[0];
return ;
}elseif(isset($this->_scope[$method])){// 命名范围的单独调用支持
return ;
}else{
}*/
}
/*
* 选择数据库
* @access public
* @param string $database 选择的数据库名称
* @return mixed 数据库连接信息
* */
public function select_db($database){
$select_db = mysqli_select_db($this->_dbObj,$database);
if($select_db){
$this->_database = $database;
$_dbObj = new mysqli($this->_host,$this->_user,$this->_password,$database,$this->_port);
$this->_dbObj = $_dbObj;
return $this;
}else{
$this->error = mysqli_error($this->_dbObj);
return false;
}
}
/*
* 数据库用户更换
* @access public
* @param string $user 数据库用户名称
* @param string $password 数据库用户密码
* @return mixed 数据库连接信息
* */
public function change_user($user,$password){
$change_user = mysqli_change_user($this->_dbObj,$user,$password,$this->_database);
if($change_user){
$this->_user = $user;
$this->_password = $password;
$_dbObj = new mysqli($this->_host,$this->_user,$this->_password,$this->_database,$this->_port);
$this->_dbObj = $_dbObj;
return $this;
}else{
$this->error = mysqli_error($this->_dbObj);
return false;
}
}
/*
* 查询数据库中所有的表名
* @access public
* @return array 数据表的数量和表名
* */
public function tables(){
$sql = 'show tables';
$search_res = mysqli_query($this->_dbObj,$sql);
if($search_res){
$num_rows = $search_res->num_rows;
$tables_msg = array(
'count'=>$num_rows,
'tables'=>array()
);
for($i=0;$i<$num_rows;$i++){
$row = $search_res->fetch_assoc();
$key = &#39;Tables_in_&#39;.$this->_database;
array_push($tables_msg[&#39;tables&#39;],$row[$key]);
}
mysqli_free_result($search_res);
return $tables_msg;
}else{
mysqli_free_result($search_res);
return false;
}
}
/*
* 获取指定表中所有信息
* @access public
* @param string $table 数据表名称
* @return array 数据表的详细信息
* */
public function select_table($table){
$sql = &#39;select * from &#39;.$table;
$search_res = mysqli_query($this->_dbObj,$sql);
if($search_res){
$this->_table = $table;
$table_msg = self::query_handle($search_res);
$this->_tableObj = $table_msg;
mysqli_free_result($search_res);
return $table_msg;
}else{
mysqli_free_result($search_res);
return false;
}
}
/*
* 获取指定表的字段详细信息
* @access public
* @param string $table 数据表名称
* @return array 数据表的字段详细信息
* */
public function select_table_fields($table){
$sql = &#39;show fields from &#39;.$table;
$search_res = mysqli_query($this->_dbObj,$sql);
if($search_res){
$this->_table = $table;
$fields_msg = self::query_handle($search_res);
mysqli_free_result($search_res);
return $fields_msg;
}else{
mysqli_free_result($search_res);
return false;
}
}
/*
* 获取数据表中指定字段信息(允许多字段同时查询)
* @access public
* @param mixed $field 指定字段(字符串传入使用,间隔)
* @return array 数据表中指定字段信息
* */
public function getField($field){
$fields = self::param_handle($field);
$count = count($fields);
for($i=0;$i<$count;$i++){
$index = $fields[$i];
$sql = &#39;select &#39;.$index.&#39; from &#39;.$this->_table;
$res = mysqli_query($this->_dbObj,$sql);
$field_msg[$index] = self::query_handle($res);
}
return $field_msg;
}
/*
* mysqli_query函数结果处理函数
* @access protected
* @param object $obj mysqli_query函数结果
* @return array 数据表中指定字段信息
* */
protected function query_handle($obj){
$res = array();
for($i=0;$i<$obj->num_rows;$i++){
$row = $obj->fetch_assoc();
array_push($res,$row);
}
return $res;
}
/*
* 传入参数处理函数
* @access protected
* @param mixed $param 传入参数
* @return array 处理后数组数据
* */
public function param_handle($param){
if(is_string($param)&&!empty($param)){
$params = explode(&#39;,&#39;,$param);
}elseif(is_array($param)&&!empty($param)){
$params = $param;
}else{
return false;
}
return $params;
}
/*
* 查询表达式参数处理函数
* @access protected
* @param mixed $param 传入参数(where limit order)
* @return string 处理后字符串数据
* */
public function options_handle($param){
if(is_numeric($param)){
$option = $param;
}elseif(is_string($param)&&!empty($param)&&!is_numeric($param)){
$params = explode(&#39;,&#39;,$param);
$count = count($params);
$option = implode(&#39; and &#39;,$params);
}elseif(is_array($param)&&!empty($param)){
$params = $param;
$count = count($params);
$arr = array();
foreach($param as $key=>$value){
$tip = "$key=$value ";
array_push($arr,$tip);
}
$option = implode(&#39; and &#39;,$arr);
}else{
return false;
}
return $option;
}
/*
* 查询表达式$options处理函数
* @access protected
* @return string 处理后字符串数据
* */
protected function option(){
$optiOns= $this->options;
$option = &#39;&#39;;
if(isset($options[&#39;where&#39;])){
$option .= &#39;where &#39;.$options[&#39;where&#39;].&#39; &#39;;
}
if(isset($options[&#39;order&#39;])){
$option .= &#39;order by &#39;.$options[&#39;order&#39;].&#39; &#39;.$options[&#39;order_type&#39;].&#39; &#39;;
}
if(isset($options[&#39;limit&#39;])){
$option .= &#39;limit &#39;.$options[&#39;limit&#39;];
}
return $option;
}
/*
* 根据查询表达式查询数据(符合条件的所有记录)
* @access public
* @return array 满足查询表达式的特定数据
* */
public function find(){
$option = self::option();
$sql = &#39;select * from &#39;.$this->_table.&#39; &#39;.$option;
$search_res = mysqli_query($this->_dbObj,$sql);
$msg = self::query_handle($search_res);
return $msg;
}
/*
* 查询表达式 where处理函数
* @access public
* @param mixed $where where查询条件
* @return object $this
* */
public function where($where){
$this->options[&#39;where&#39;] = self::options_handle($where);
return $this;
}
/*
* 查询表达式 limit处理函数
* @access public
* @param mixed $limit limit查询条件(数字)
* @return object $this
* */
public function limit($limit){
$this->options[&#39;limit&#39;] = self::options_handle($limit);
return $this;
}
/*
* 查询表达式 order处理函数
* @access public
* @param string $order order查询条件
* @param string $type order查询条件的顺序(默认降序)
* @return object $this
* */
public function order($order,$type=&#39;desc&#39;){
$this->options[&#39;order&#39;] = $order;
$this->options[&#39;order_type&#39;] = $type;
return $this;
}
/*
* 数据处理函数(最多处理二维数据)
* @access public
* @param array $data 需要插入的数据
* @return object $this
* */
public function data(array $data){
$values = array();
$fields = array();
if(is_array($data)){
foreach($data as $key=>$value){
if(is_array($value)){ //二维数组
$tip = 1;
array_push($values,&#39;(&#39;.implode(&#39;,&#39;,array_values($value)).&#39;)&#39;);
array_push($fields,&#39;(&#39;.implode(&#39;,&#39;,array_keys($value)).&#39;)&#39;);
}else{ //一维数组
$tip = 0;
}
}
}else{
return false;
}
if(!$tip){
array_push($values,&#39;(&#39;.implode(&#39;,&#39;,array_values($data)).&#39;)&#39;);
array_push($fields,&#39;(&#39;.implode(&#39;,&#39;,array_keys($data)).&#39;)&#39;);
}
$this->data[&#39;fields&#39;] = $fields[0];
$this->data[&#39;values&#39;] = implode(&#39;,&#39;,$values);
return $this;
}
/*
* 数据新增函数
* @access public
* @return mixed 数据库新增信息
* */
public function add(){
$fields = $this->data[&#39;fields&#39;];
$values = $this->data[&#39;values&#39;];
$sql = &#39;INSERT INTO &#39;.$this->_table.$fields.&#39;VALUES&#39;.$values;
$res = mysqli_query($this->_dbObj,$sql);
return $res;
}
/*
* 数据更新函数(一维数组)
* @access public
* @param array $data 需要更新的数据
* @return mixed 数据库新增信息
* */
function save(array $data){
$tip = array();
if(is_array($data)){
foreach($data as $key=>$value){
array_push($tip,"$key=$value");
}
}else{
return false;
}
$set_msg = implode(&#39;,&#39;,$tip);
$sql = &#39;UPDATE &#39;.$this->_table.&#39; SET &#39;.$set_msg.&#39; WHERE &#39;.$this->options[&#39;where&#39;];
$res = mysqli_query($this->_dbObj,$sql);
return $res;
}
/*
* 数据删除函数
* @access public
* @return mixed 数据库删除信息
* */
public function delete(){
$sql = &#39;DELETE FROM &#39;.$this->_table.&#39; WHERE &#39;.$this->options[&#39;where&#39;];
$res = mysqli_query($this->_dbObj,$sql);
return $res;
}
/*
* SQL语句查询
* */
public function query($sql){
$search_res = mysqli_query($this->_dbObj,$sql);
return $search_res;
}
/*
* mysql中查询语句
* */
protected function sql(){
/*
* 基本SQL语句
* 插入数据:INSERT INTO tb_name(id,name,score)VALUES(NULL,&#39;张三&#39;,140),(NULL,&#39;张四&#39;,178),(NULL,&#39;张五&#39;,134);
* 更新语句:UPDATE tb_name SET score=189 WHERE id=2;
* 删除数据:DELETE FROM tb_name WHERE id=3;
* WHERE语句:SELECT * FROM tb_name WHERE id=3;
* HAVING 语句:SELECT * FROM tb_name GROUP BY score HAVING count(*)>2
* 相关条件控制符:=、>、<、<>、IN(1,2,3......)、BETWEEN a AND b、NOT AND 、OR Linke()用法中 % 为匹配任意、 _ 匹配一个字符(可以是汉字)IS NULL 空值检测
* MySQL的正则表达式:SELECT * FROM tb_name WHERE name REGEXP &#39;^[A-D]&#39; //找出以A-D 为开头的name
* */
}
/*
* 关闭连接
* */
public function close(){
$close = mysqli_close($this->_dbObj);
if($close){
return true;
}else{
return false;
}
}
function __destruct(){
mysqli_close($this->_dbObj);
}
}
操作示例:
首先实例化此类,其中需要输入host(数据库地址)、user(数据库用户)、password(数据库用户密码)、database(数据库名称)此四种信息,进行数据库的连接,然后即可调用select_table()方法,其中传入数据表名,从而设置对指定表的操作,从而即可利用连贯操作进行相应数据的增删改查。 其中参数基本均支持字符串和数组两种形式。
include &#39;/classes/db.php&#39;;
$db = new \Database(&#39;localhost&#39;, &#39;root&#39;, &#39;901230&#39;, &#39;weixin&#39;);
//$db = new \mysqli(&#39;localhost&#39;,&#39;root&#39;,&#39;901230&#39;,&#39;weixin&#39;);
//$db->select_db(&#39;visitor&#39;);
//dump($db->error());
//$db->change_user(&#39;helen&#39;,&#39;901230&#39;);
$table = &#39;zyd_fuweng_user&#39;;
//dump($db->select_table_fields($table));
//dump($db->error());
$db->select_table($table);
$param1 = &#39;123&#39;;
$param2 = &#39;id>1,record>100&#39;;
$param3 = array(
/*array(&#39;count&#39;=>1,&#39;openid&#39;=>&#39;123&#39;,&#39;record&#39;=>&#39;100&#39;),
array(&#39;count&#39;=>2,&#39;openid&#39;=>&#39;234&#39;,&#39;record&#39;=>&#39;200&#39;),*/
array(&#39;count&#39; => 4, &#39;openid&#39; => &#39;456&#39;, &#39;record&#39; => &#39;500&#39;)
);
$param4 = array(&#39;count&#39; => 4, &#39;openid&#39; => &#39;456&#39;, &#39;record&#39; => &#39;500&#39;);
//dump($db->where(&#39;id=4&#39;)->save($param4));
dump($db->where(&#39;count=4&#39;)->delete());
die;
dump($db->data($param3)->add());
dump(array_keys($param3));
dump(array_values($param3));
dump(implode(&#39;,&#39;, array_values($param3)));
dump(implode(&#39;,&#39;, array_keys($param3)));
dump($db->where($param2)->order(&#39;id&#39;)->limit(2)->find());
dump($db->options_handle($param1));
dump($db->options_handle($param2));
dump($db->options_handle($param3));
$array = array(&#39;id&#39;, &#39;count&#39;);
$num = &#39;123&#39;;
if (is_string($num)) {
echo &#39;true&#39;;
}
dump($db->getField($array));
dump($db->select_table_fields($table));
/*$array = array(&#39;a&#39;,&#39;b&#39;);
$array1 = array();
dump($db->getField(&#39;a,b&#39;));
dump($db->getField($array));
dump($db->getField($array1));
dump($db->getField(&#39;&#39;));*/
/*$str = &#39;&#39;;
if(empty($str)){
echo &#39;true&#39;;
}*/
/*$model = M(&#39;zyd_fuweng_user&#39;);
$res = $model->getField(&#39;create_time,count&#39;);
dump($res);*/
die;
//
$table = &#39;zyd_fuweng_user&#39;;
//选择指定的数据库,并返回其中全部信息
$table_msg = $db->select_table($table);
//选择指定数据库,返回数据库的字段信息
$table_field_msg = $db->select_table_fields($table);
//条件搜索,传入条件均为数据
$where = array(
&#39;id&#39; => 1
);
$data = array(
&#39;headimgurl&#39; => &#39;helen.jpg&#39;
);
dump($db->where($where)->field(&#39;field&#39;));
dump($table);
/*$dbObj = new \mysqli(&#39;localhost&#39;,&#39;helen&#39;,&#39;901230&#39;,&#39;weixin&#39;,&#39;3306&#39;);
//$query = &#39;select * from zyd_fuweng_user&#39;;
$query = &#39;show fields from zyd_fuweng_user&#39;;
$tables = mysqli_query($dbObj,$query);
//dump($tables);
$count = $tables->num_rows;
$arr = array();
for($i=0;$i<$count;$i++){
$row = $tables->fetch_assoc();
//dump($row);
array_push($arr,$row);
}
mysqli_free_result($tables);
dump($arr);
die;
$query1 = &#39;select * from zyd_fuweng_user&#39;;
$table_msg = mysqli_query($dbObj,$query1);
//输出查询结果
$num = $table_msg->num_rows;
for($i=0;$i<$num;$i++){
$row = $table_msg->fetch_assoc();
dump($row);
}
dump($dbObj);
dump($tables);
dump($table_msg);
$res = mysqli_close($dbObj);
dump($res);*/