简单的模仿tp做了一个数据库处理类，在平时处理数据库语句的时候可以方便一点
select,prepaer,row_count,delete,update,insert方法应放在最后使用，where,orderby,limit,field方法则不要求顺序，clearkey方法如使用需放在最前使用，我为了以前代码的兼容性没有删除，已不建议使用
<?php
/**
* Created by PhpStorm.
* User: MCtion
* Date: 2014/11/30 0030
* Time: 15:40
* 接收数据库名，连接数据库，提供CURD接口
* 连接模式：PDO
* 方法：Insert,Update,Delete,Select,PrePare,ClearKey,Limit,OrderBy,Where
*/
if(!defined("__WEBROOT__")) define("__WEBROOT__",$_SERVER['DOCUMENT_ROOT']);
class NewSql {
public $Db; //数据库实例
public $Error = False;
public $ErrorMsg = '';
//设定数据库连接信息
protected $_Sql = 'mysql';
protected $_Host = 'localhost';
protected $_Port = 3306;
protected $_User = 'yxb';
protected $_Pass = 'yxbsqlpass';
protected $_DbName = ''; //数据库名
//配置参数
protected $_NoAllAction = 1; //全局设定，1为禁止全表更新、删除操作，0为允许
protected $_LastSQL = Null; //记录最后一次执行的SQL语句，方便进行错误调试
//初始化条件信息
protected $_Where = '';
protected $_OrderBy = '';
protected $_Limit = '';
protected $_Field = '*';
//初始化标记信息
protected $_Clear = 0; //状态，0表示查询条件干净，1表示查询条件污染
protected $_LinkClass = 'PDO'; //标记，设定使用PDO还是SQL方式
/**
* 初始化类
* @param string $DbName 设置数据库名
*/
public function __construct($DbName = 'yxb'){
$this->_DbName = $DbName;
if(class_exists('PDO')) {
$Db = new PDO($this->_Sql . ':host=' . $this->_Host . ';dbname=' . $this->_DbName, $this->_User, $this->_Pass) or die("PDO对象初始化失败");
$Db->exec("set names utf8");
$this -> Db = $Db;
//因为PDO方式没有类似mysql_real_escape_string()函数的方法，因此如果是PDO连接就创建一个过程连接
mysql_connect($this -> _Host.":".$this -> _Port,$this -> _User,$this -> _Pass);
}else{
$Db = new MySQLi($this -> _Host,$this -> _User,$this -> _Pass,$this -> _DbName,$this -> _Port) or die("MySQLi对象初始化失败");
$Db -> query("set names utf8");
$this -> Db = $Db;
$this -> _LinkClass = "SQL";
}
}
/**
* __set方法的实现
* @param $Key
* @param $Val
*/
public function __set($Key,$Val){
if(isset($this -> $Key)){
$this -> $Key = $Val;
}
}
/**
* 插入方法
* @param string $TableName 操作的数据表名
* @param array $Options 字段-值数组
* @return int 受影响的行数
*/
public function Insert($TableName,array $Options){
if(!is_array($Options)){
$this -> Error = True;
$this -> ErrorMsg = "条件错误：插入语句必须传入插入数据";
return False;
}
foreach($Options as $K=>$V){
if(!is_scalar($K)) continue;
$KeyArr[] = "`".trim($K)."`";
$ValArr[] = "'".$this -> _Real_ValString(trim($V))."'";
}
$Query = "Insert Into {$TableName}(".implode(',',$KeyArr).") values(".implode(',',$ValArr).")";
$this -> _LastSQL = $Query;
//return $Query;
$this -> _Clear = 1;
$this -> Clear();
if($this -> _LinkClass == "PDO"){
return $this -> Db -> exec(trim($Query));
}else{
$this -> Db -> query(trim($Query));
return $this -> Db -> affected_rows;
}
}
/**
* 删除方法
* @param string $TableName 操作的数据表名
* @return int 受影响的行数
*/
public function Delete($TableName){
if(!$this -> _Where && $this -> _NoAllAction){
$this -> Error = True;
$this -> ErrorMsg = "参数错误：没有指定更新条件，禁止全表更新";
return False;
};
if($this -> Error){die($this -> ErrorMsg);}
$Query = "Delete from {$TableName} ".trim($this -> _Where);
$this -> _LastSQL = $Query;
$this -> _Clear = 1;
$this -> Clear();
if($this -> _LinkClass == "PDO"){
return $this -> Db -> exec(trim($Query));
}else{
$this -> Db -> query(trim($Query));
return $this -> Db -> affected_rows;
}
}
/**
* 更新函数
* @param string $TableName 操作的数据表名
* @param array $Options 参数数组
* @return int 受影响的行数
*/
public function Update($TableName,array $Options){
if(!$this -> _Where && $this -> _NoAllAction){
$this -> Error = True;
$this -> ErrorMsg = "参数错误：没有指定更新条件，禁止全表更新";
return False;
};
if(!is_array($Options)){
$this -> Error = True;
$this -> ErrorMsg = "条件错误：更新语句必须传入更新数据";
return False;
}
if($this -> Error){die($this -> ErrorMsg);}
$Sql = "Update {$TableName} Set";
foreach($Options as $K=>$V){
if(!is_scalar($K)) continue;
if(strpos($V, '`') !== False){
$Sql .= " `".trim($K)."`=".$this -> _Real_ValString(trim($V)).",";
}else{
$Sql .= " `".trim($K)."`='".$this -> _Real_ValString(trim($V))."',";
}
}
$Sql = substr($Sql,0,strlen($Sql) - 1);
$Query = $Sql . " ".trim($this -> _Where);
$this -> _LastSQL = $Query;
$this -> _Clear = 1;
$this -> Clear();
if($this -> _LinkClass == "PDO"){
return $this -> Db -> exec($Query);
}else{
$this -> Db -> query(trim($Query));
return $this -> Db -> affected_rows;
}
}
/**
* 创建查询语句
* @param $TableName
* @return string
*/
protected function _Create_Query($TableName){
return trim("Select ".trim($this -> _Field)." from {$TableName} ".trim($this -> _Where)." ".trim($this -> _OrderBy)." ".trim($this -> _Limit));
}
/**
* 查询函数
* @param string $TableName 操作的数据表名
* @return array 查询到的所有行数组
*/
public function Select($TableName){
if($this -> Error){die($this -> ErrorMsg);}
$Query = $this -> _Create_Query($TableName);
$this -> _LastSQL = $Query;
//return $Query;
$this -> _Clear = 1;
$this -> Clear();
$SqlObject = $this -> Db -> query($Query);
if($this -> _LinkClass == 'PDO'){
return $SqlObject -> fetchAll(PDO::FETCH_ASSOC);
}else{
return $SqlObject -> fetch_all(MYSQL_ASSOC);
}
}
/**
* 统计查询条数
* @param $TableName
* @return int
*/
public function Row_Count($TableName){
if($this -> Error){die($this -> ErrorMsg);}
$Query = $this -> _Create_Query($TableName);
$this -> _LastSQL = $Query;
$this -> _Clear = 1;
$this -> Clear();
$SqlObject = $this -> Db -> query($Query);
if($this -> _LinkClass == 'PDO'){
return $SqlObject -> rowCount();
}else{
return $SqlObject -> num_rows;
}
}
/**
* PDO的PrePare语句，没有开启PDO类库是返回FALSE
* @param string $TableName 要操作的数据表名
* @return object|bool PrePare查询对象，需在外部调用相关方法
*/
public function PrePare($TableName){
if($this -> Error){die($this -> ErrorMsg);}
$this -> _Where = str_replace("'?'",'?',$this -> _Where);
$Query = "Select ".trim($this -> _Field)." from {$TableName} ".trim($this -> _Where)." ".trim($this -> _OrderBy)." ".trim($this -> _Limit);
$this -> _LastSQL = $Query;
$this -> _Clear = 1;
$this -> Clear();
if($this -> _LinkClass == 'PDO'){
return $this -> Db -> prepare(trim($Query));
}else{
$this -> Error = True;
$this -> ErrorMsg = "参数错误：您没有开启PDO类库，无法使用PrePare语句";
}
}
/**
* 开启事务
*/
public function BeginTransaction(){
if($this -> _LinkClass == 'PDO'){
$this -> Db -> beginTransaction();
}else{
$this -> Db -> autocommit(False);
}
}
/**
* 提交事务
*/
public function Commit(){
if($this -> _LinkClass == 'PDO'){
$this -> Db -> commit();
}else{
$this -> Db -> commit();
$this -> Db -> autocommit(True);
}
}
/**
* 回滚事务
*/
public function RollBack(){
if($this -> _LinkClass == 'PDO'){
$this -> Db -> rollback();
}else{
$this -> Db -> rollback();
$this -> Db -> autocommit(True);
}
}
/**
* 返回最后一次执行的SQL语句
* @return null|string
*/
public function GetLastSQL(){
return $this -> _LastSQL;
}
/**
* 字符串转义方法，以防止数据无法插入数据库
* @param string $Val 转义的字符串
* @return string
*/
protected function _Real_ValString($Val){
if($this -> _LinkClass == "PDO"){
//如果连接方式为PDO则使用过程方法中的mysql_real_escape_string()函数
return mysql_real_escape_string($Val);
}else{
return $this -> Db -> real_escape_string($Val);
}
}
/**
* 创建in,not in语句
* @param $Field
* @param array $Options
* @param $Conditions1
* @param $Conditions2
* @return string
*/
protected function _Create_In_Sql($Field,array $Options,$Conditions1,$Conditions2){
$Sql = '';
$Sql .= " `".trim($Field)."` ".trim($Conditions1)." (";
foreach($Options as $vo){
$Sql .= "'".trim($vo)."',";
}
$Sql = substr($Sql,0,strlen($Sql) - 1);
$Sql .= ") ".trim($Conditions2);
return $Sql;
}
/**
* 创建between,not between语句
* @param $Field
* @param array $Options
* @param $Conditions1
* @param $Conditions2
* @return string
*/
protected function _Create_Between_Sql($Field,array $Options,$Conditions1,$Conditions2){
return " `".trim($Field)."` ".trim($Conditions1)." ".trim($Options[0])." and ".trim($Options[1])." ".$Conditions2;
}
/**
* 支持条件：=,>,<,>=,<=,in,not in,between,not between,like,not like,multi
* 支持组合：and or
* 示例：$Options['Field1'] = array('Test','=','and');
* 注释：如果二维数组中的第二字段为in,not in,between,not between，则第一字段必须是数组，如下
* 示例2：$Options['Field1'] = array(array(2,4),'between','and');
* 注释：如果需要操作多个同名字段，则第二字段必须为multi，第一字段必须为数组，如下
* 示例3：$Options['Field1'] = array(array(array('10','<','or'),array('30','>','and')),'multi','and');
* @param array|string $Option 组合条件数组
* @return $this
*/
public function Where($Option){
if($this -> _Clear > 0) $this -> Clear();
if(is_string($Option)){
$this -> _Where = trim($Option);
}elseif(is_array($Option)){
$this -> _Where = 'where';
$ContConditions = 'and';
//开始循环条件数组
foreach($Option as $K=>$V){
if(is_scalar($V)){
//如果值不是数组，那么直接将其作为查询条件的值，其他条件默认为=、and
$this -> _Where .= " `".$K."` = '".$V."' and";
}else{
if(!empty($V[1]) &&strtolower($V[1] == 'multi')){
//处理多条件查询
if(!is_array($V[0])){
$this -> Error = True;
$this -> ErrorMsg = "条件错误：{$K}项第一字段必须为数组";
return False;
}
for($I = 0;$I < count($V[0]);$I++){
//遍历第一个条件数组
if(in_array(strtolower($V[0][$I][2]),array('in','not in'))){
$this -> _Where .= $this -> _Create_In_Sql($K,$V[0][$I][0],$V[0][$I][1],$V[0][$I][2]);
}elseif(in_array(strtolower($V[0][$I][2]),array('between','not between'))){
$this -> _Where .= $this -> _Create_Between_Sql($K,$V[0][$I][0],$V[0][$I][1],$V[0][$I][2]);
}else{
$this -> _Where .= " `".trim($K)."` ".trim($V[0][$I][1])." '".trim($V[0][$I][0])."' ".trim($V[0][$I][2]);
}
$ContConditions = $V[0][$I][2];
}
}elseif(!empty($V[1]) && in_array(strtolower(trim($V[1])),array('in','not in','between','not between'))){
if(!is_array($V[0])){
$this -> Error = True;
$this -> ErrorMsg = "条件错误：{$K}项第一字段必须为数组";
return False;
}
$Conditions = isset($V[2]) ? $V[2] : 'and';
$ContConditions = $Conditions;
if(in_array(strtolower($V[1]),array('in','not in'))){
$this -> _Where .= $this -> _Create_In_Sql($K,$V[0],$V[1],$Conditions);
}else{
$this -> _Where .= $this -> _Create_Between_Sql($K,$V[0],$V[1],$Conditions);
}
}else{
$Conditions1 = isset($V[1]) ? $V[1] : '=';
$Conditions2 = isset($V[2]) ? $V[2] : 'and';
$ContConditions = $Conditions2;
$this -> _Where .= " `".$K."` ".$Conditions1." '".$V[0]."' ".$Conditions2;
}
}
}
$this -> _Where = trim(substr($this -> _Where,0,strlen($this -> _Where) - strlen($ContConditions)));
//return $this -> _Where;
}else{
$this -> Error = True;
$this -> ErrorMsg = "条件错误：WHERE语句只允许使用字符串或数组";
return False;
}
return $this;
}
/**
* 设置排序
* @param array $Val 排序条件数组 例:array('sort'=>'desc')
* @return $this
*/
public function OrderBy(array $Val){
if($this -> _Clear > 0) $this -> Clear();
$this -> _OrderBy = "order by ";
foreach($Val as $K=>$V){
$this -> _OrderBy .= trim($K)." ".trim($V).",";
}
$this -> _OrderBy = trim(substr($this -> _OrderBy,0,strlen($this -> _OrderBy) - 1));
return $this;
}
/**
* 设置查询行数及页数
* @param $Page $PageSize不为空时为页数，否则为行数
* @param null $PageSize 为空则函数设定取出行数，不为空则设定取出行数及页数
* @return $this
*/
public function Limit($Page,$PageSize = null){
if($this -> _Clear > 0) $this -> Clear();
if($PageSize == null){
$this -> _Limit = "limit ".$Page;
}else{
$SelStart = ($Page - 1) * $PageSize;
$this -> _Limit = "limit ".$SelStart.",".$PageSize;
}
return $this;
}
/**
* 设置查询字段
* @param array $Field 字段数组
* @return $this
*/
public function Field(array $Field){
if($this -> _Clear > 0) $this -> Clear();
$this -> _Field = '';
foreach($Field as $K=>$V){
$this -> _Field .= trim($V).",";
}
$this -> _Field = trim(substr($this -> _Field,0,strlen($this -> _Field) - 1));
return $this;
}
/**
* 清理标记函数
*/
protected function Clear(){
$this -> _Where = '';
$this -> _OrderBy = '';
$this -> _Limit = '';
$this -> _Clear = 0;
$this -> _Field = '*';
}
/**
* 手动清理标记
* @return $this
*/
public function ClearKey(){
$this -> _Where = '';
$this -> _OrderBy = '';
$this -> _Limit = '';
$this -> _Clear = 0;
$this -> _Field = '*';
return $this;
}
/**
* @param string $Address 备份类型，默认为SERVER，用以返回后判断动作
* @return mixed|string 返回备份信息的JSON格式数据
*/
public function BackUp($Address = 'SERVER'){
//连接数据库
$DB = new MySqli($this -> _Host,$this -> _User,$this -> _Pass,$this -> _DbName);
$DB -> query("set names utf8");
//检查并创建备份目录、名称
$FilePath = '/BackUp/';
if(!file_exists(__WEBROOT__.$FilePath)){
mkdir(__WEBROOT__.$FilePath,0777,True);
}
$FileName = 'Back'.date('YmdHis').'.sql';
$File = fopen(__WEBROOT__.$FilePath.$FileName,'a'); //追加模式打开文件句柄
//创建头部信息
$Sql = Null;
$Sql .= "-- Server Type :MySql \r\n";
$Sql .= "-- Create User : \r\n";
$Sql .= "-- Create Time :".date('Y-m-d H:i:s')." \r\n\r\n\r\n";
fwrite($File,$Sql); //写入头部信息
$Databases = $DB -> query("show tables"); //查询所有数据表
while($vo = $Databases -> fetch_array(MYSQL_NUM)){ //遍历数据表
$Sql = Null;
$Table = $DB -> query("show create table ".$vo[0]); //查询当前表的创建语句
if($vo2 = $Table -> fetch_array(MYSQL_NUM)){
$Sql = Null;
//创建表语句
$Sql .= "-- Create Table ".$vo2[0]." \r\n";
$Sql .= $vo2[1].";\r\n\r\n";
//创建数据语句
$Sql .= "-- Insert Table ".$vo2[0]." \r\n";
$Insert = $DB -> query("select * from ".$vo2[0]);
while($vo3 = $Insert -> fetch_array(MYSQL_ASSOC)){
$Sql .= "Insert Into ".$vo2[0]." Values(";
foreach($vo3 as $Key=>$Val){
$Sql .= "'".$DB -> real_escape_string($Val)."',";
}
$Sql = substr($Sql,0,strlen($Sql) - 1);
$Sql .= ");\r\n";
}
}else{
$BackUpArr['address'] = strtoupper($Address);
$BackUpArr['state'] = 1;
$BackUpArr['msg'] = '失败：无法读取表语句，请重试或联系管理员';
$BackUpArr['filepath'] = '';
@unlink(__WEBROOT__.$FilePath.$FileName);
return json_encode($BackUpArr);
}
$Sql .= "\r\n\r\n";
fwrite($File,$Sql); //每个数据库表插入一次
}
fclose($File);
$BackUpArr['address'] = strtoupper($Address);
$BackUpArr['state'] = 200;
$BackUpArr['msg'] = '备份成功';
$BackUpArr['filepath'] = $FilePath.$FileName;
return json_encode($BackUpArr);
}
}示例
$DbRes = new NewSql();
$ConditionsTempArr['id'] = array(array(1,10),'between');
$ConditionsTempArr['title'] = array('测试数据','=','or');
$ConditionsTempArr['description'] = array('%测试数据%','like','or');
$ConditionsTempArr['sort'] = array(array(array(array(3,5),'in','or'),array(10,'>','and')),'multi','and');
$OptionsInsertArr['description'] = 3;
$OptionsUpdateArr['number'] = "`number` + 3";
$DbRes -> Where($ConditionsTempArr) -> Select('img');
$DbRes -> Insert('img',$OptionsInsertArr);
$DbRes -> Where($ConditionsTempArr) -> Update('img',$OptionsUpdateArr);
$DbRes -> Where($ConditionsTempArr) -> Delete('img'); 
