php 链接 sqlserver 2005以上版本数据库

<?php
/**
 * 数据库管理
 *
 * @author wangaibo168@163.com
 * @charset utf-8
 * 不支持sqlserver2005(包括)以下的版本
 */

class Db {

    /**
     * @var 数据库连接配置
     */
    private static $DbLink;

    /**
     * @var 数据库连接配置
     */
    private static $DbConfig;

    /**
     * @var 需要执行的SQL语句
     */
    private static $SqlStr;

    /**
     * @var 最后错误信息
     */
    private static $ErrorMsg;

    /**
     * 默认构造函数
     */
    public function __construct(){
        self::set('host','localhost');
        self::set('port','33333');
        self::set('username','lpinfoe');
        self::set('password','LOPALinfo8e');
        self::set('database','lopal2015e');
        self::set('charset','utf-8');
    }

    /**
     * 配置连接参数
     * @param $opt
     */
    public static function configure($opt){
        if(!is_array($opt)) return;
        self::$DbConfig = $opt;
    }

    /**
     * 设置连接参数
     * @param $key
     * @param $value
     */
    public static function set($key,$value){
        if(empty($key)) return;
        if(!is_array(self::$DbConfig)) self::$DbConfig = array();
        self::$DbConfig[$key] = $value;
    }

    /**
     * 读取连接参数
     * @param $key
     * @return null
     */
    public static function get($key){
        if(!is_array(self::$DbConfig) || empty($key) || !array_key_exists($key,self::$DbConfig)) return null;
        return self::$DbConfig[$key];
    }

    /**
     * 数据库连接参数检查
     * @return bool
     */
    public static function check(){
        $host = self::get('host');
        if(empty($host)) return false;
        $port = self::get('port');
        if(!is_numeric($port) || $port<0 || $port>65535) return false;
        $username = self::get('username');
        if(empty($username)) return false;
        $database = self::get('database');
        if(empty($database)) return false;
        $charset = self::get('charset');
        if(empty($charset)) return false;
        return true;
    }

    /**
     * 连接初始化
     * @param bool $reconnect
     */
    public static function connect($reconnect=false){
        if(!$reconnect && is_resource(self::$DbLink)) return;
        self::close();
        if(!self::check()) die('Database Configuration Error');
        $opt = array('Database'=>self::get('database'),'CharacterSet'=>self::get('charset'),'UID'=>self::get('username'),'ReturnDatesAsStrings'=>true,'PWD'=>self::get('password'));
        self::$DbLink = sqlsrv_connect(self::get('host').','.self::get('port'),$opt);
        if(!is_resource(self::$DbLink)){
            $err = sqlsrv_errors();
            die('Database Connection Error('.$err[0]['message'].')');
        }
        // 测试连接是否可用

/*        $stmt = sqlsrv_query(self::$DbLink,'select 1 num');
        if(!is_resource($stmt)){
            $err = sqlsrv_errors();
            die('Database Query Error('.$err[0]['message'].')');
        }
        sqlsrv_free_stmt($stmt);*/

    }

    /**
     * 查询SQL语句
     * @param $sql
     * @param array $params
     * @return array|bool
     */
    public static function executeQuery($sql,$params=array()){
        self::$SqlStr = $sql;
        self::$ErrorMsg = '';
        if(empty($sql)) return false;
        self::connect();
        if(!is_array($params)){
            $params = array();
        }
        $stmt = sqlsrv_query(self::$DbLink,self::$SqlStr,$params);
        if(!is_resource($stmt)){
            $err = sqlsrv_errors();
            self::$ErrorMsg = $err[0]['message'];
            return false;
        }
        $arr = explode(';',$sql);
        if(count($arr)>1){
            for($i=count($arr);$i>1;$i--){
                sqlsrv_next_result($stmt);
            }
        }
        $rows = array();
        while($row = sqlsrv_fetch_array($stmt,SQLSRV_FETCH_ASSOC)){
            $rows[] = $row;
        }
        sqlsrv_free_stmt($stmt);
        return $rows;
    }

    /**
     * 查询SQL语句
     * @param $sql
     * @param array $params
     * @return bool|int
     */
    public static function executeCount($sql,$params=array()){
        self::$SqlStr = $sql;
        self::$ErrorMsg = '';
        if(empty($sql)) return false;
        self::connect();
        if(!is_array($params)){
            $params = array();
        }
        $stmt = sqlsrv_query(self::$DbLink,self::$SqlStr,$params);
        if(!is_resource($stmt)){
            $err = sqlsrv_errors();
            self::$ErrorMsg = $err[0]['message'];
            return false;
        }
        $row = sqlsrv_fetch_array($stmt,SQLSRV_FETCH_NUMERIC);
        $count = 0;
        if(is_array($row) && count($row)==1){
            $count = intval($row[0]);
        }
        sqlsrv_free_stmt($stmt);
        return $count;
    }

    /**
     * 执行SQL语句
     * @param $sql
     * @param array $params
     * @return bool|int
     */
    public static function executeUpdate($sql,$params=array()){
        self::connect();
        self::$SqlStr = $sql;
        self::$ErrorMsg = '';
        if(empty($sql)) return false;
        self::connect();
        if(!is_array($params)){
            $params = array();
        }
        $stmt = sqlsrv_query(self::$DbLink,self::$SqlStr,$params);
        if(!is_resource($stmt)){
            $err = sqlsrv_errors();
            self::$ErrorMsg = $err[0]['message'];
            return false;
        }
        $num = sqlsrv_rows_affected($stmt);
        sqlsrv_free_stmt($stmt);
        return $num;
    }

    /**
     * 返回服务器信息
     * @return array
     */
    public static function serverInfo(){
        self::connect();
        return sqlsrv_server_info(self::$DbLink);
    }

    /**
     * 返回客户端信息
     * @return array|null
     */
    public static function clientInfo(){
        self::connect();
        return sqlsrv_client_info(self::$DbLink);
    }

    /**
     * 构建表SQL
     * @param $table
     * @return string
     */
    private static function tableSql($table){
        if(empty($table)) return '';
        if(is_array($table)){
            $arr = array();
            foreach($table as $k=>$v){
                $arr[] = '['.$v.'] '.$k;
            }
            $tableSql = implode(',',$arr);
        }else{
            $tableSql = '['.$table.']';
        }
        return $tableSql;
    }

    /**
     * 构建字段SQL
     * @param $field
     * @return string
     */
    private static function fieldSql($field){
        if(empty($field)) return '*';
        if(is_array($field)){
            $fieldSql = '['.implode('],[',$field).']';
        }else{

            $fieldSql = $field;
        }
        return $fieldSql;
    }

    /**
     * 构建条件SQL
     * @param $where
     * @return string
     */
    private static function whereSql($where){
        if(empty($where)) return '';
        $whereSql = ' where ';
        if(is_array($where)){
            $whereSql .= implode(' and ',$where);
        }else{
            $whereSql .= $where;
        }
        return $whereSql;
    }

    /**
     * 构建排序SQL
     * @param $order
     * @return string
     */
    private static function orderSql($order){
        if(empty($order)) return '';
        $orderSql = ' order by ';
        if(is_array($order)){
            $orderSql .= implode(',',$order);
        }else{
            $orderSql .= $order;
        }
        return $orderSql;
    }

    /**
     * 统计数据量
     * @param $table
     * @param $where
     * @param null $values
     * @return bool|int
     */
    public static function count($table,$where,$values=null){
        if(empty($table)) return false;
        $tableSql = self::tableSql($table);
        $whereSql = self::whereSql($where);
        self::$SqlStr = 'select count(*) from '.$tableSql.$whereSql;
        return self::executeCount(self::$SqlStr,$values);
    }

    /**
     * 添加数据
     * @param $table
     * @param $data
     * @return bool|int|string
     */
    public static function add($table,$data){
        if(empty($table) || !is_array($data) || count($data)==0) return false;
        self::connect();
        $fields = array();
        $values = array();
        $places = array();
        foreach($data as $key=>$value){ // 忽略以下划线开头的键
            if(stripos($key,'_')===0) continue;
            $fields[] = '['.$key.']';
            $values[] = $value;
            $places[] = '?';
        }
        self::$SqlStr = 'insert into ['.$table.']('.implode(',',$fields).')values('.implode(',',$places).')';
        $num = self::executeUpdate(self::$SqlStr,$values);
        return $num>0;
    }

    /**
     * 插入数据并获取最后插入数据的ID(自增长数据)
     * @param $table
     * @param $data
     * @return bool|int|string
     */
    public static function autoIdAdd($table,$data){
        if(empty($table) || !is_array($data) || count($data)==0) return false;
        self::connect();
        $fields = array();
        $values = array();
        $places = array();
        foreach($data as $key=>$value){ // 忽略以下划线开头的键
            if(stripos($key,'_')===0) continue;
            $fields[] = '['.$key.']';
            $values[] = $value;
            $places[] = '?';
        }
        self::$SqlStr = 'insert into ['.$table.']('.implode(',',$fields).')values('.implode(',',$places).');select top 1 SCOPE_IDENTITY() id';
        $rows = self::executeQuery(self::$SqlStr,$values);
        if(!is_array($rows) || count($rows)==0) return false;
        $id = $rows[0]['id'];
        if(!is_numeric($id)) return false;
        return $id;
    }

    /**
     * 更新数据
     * @param $table
     * @param $data
     * @param $where
     * @param null $value
     * @return bool
     */
    public static function update($table,$data,$where,$value=null){
        if(empty($table) || empty($where)) return false;
        self::connect();
        $whereSql = self::whereSql($where);
        $values = array();
        $places = array();
        foreach($data as $key=>$v){
            if(stripos($key,'_')===0) continue;
            $values[] = $v;
            $places[] = '['.$key.']=?';
        }
        foreach($value as $v){
            $values[] = $v;
        }
        self::$SqlStr = 'update ['.$table.'] set '.implode(',',$places).$whereSql;
        $num = self::executeUpdate(self::$SqlStr,$values);
        return $num>0;
    }

    /**
     * 删除数据
     * @param $table
     * @param $where
     * @param null $values
     * @return bool
     */
    public static function delete($table,$where,$values=null){
        if(empty($table) || empty($where)) return false;
        self::connect();
        $tableSql = self::tableSql($table);
        $whereSql = self::whereSql($where);
        self::$SqlStr = 'delete from '.$tableSql.$whereSql;
        $num = self::executeUpdate(self::$SqlStr,$values);
        return $num>0;
    }

    /**
     * 查询数据(全部)
     * @param $table
     * @param $field
     * @param $where
     * @param $order
     * @param null $values
     * @return array|bool
     */
    public static function fetchAll($table,$field,$where,$order,$values=null){
        if(empty($table)) return false;
        $tableSql = self::tableSql($table);
        $fieldSql = self::fieldSql($field);
        $whereSql = self::whereSql($where);
        $orderSql = self::orderSql($order);
        self::$SqlStr = 'select '.$fieldSql.' from '.$tableSql.$whereSql.$orderSql;
        $rows = self::executeQuery(self::$SqlStr,$values);
        return $rows;
    }

    /**
     * 查询数据(分页)
     * @param $table
     * @param $page
     * @param $size
     * @param $field
     * @param $where
     * @param $order
     * @param null $values
     * @return array|bool
     */
    public static function fetchPage($table,$page,$size,$field,$where,$order,$values=null){
        if(empty($table)) return false;
        $tableSql = self::tableSql($table);
        $fieldSql = self::fieldSql($field);
        $whereSql = self::whereSql($where);
        $orderSql = self::orderSql($order);
        $size = intval($size);
        if($size<=0) $size = 10;
        $start = ($page-1)*$size;
        if($start<0) $start = 0;
        $end = $start+$size;
        self::$SqlStr = 'select * from (select ROW_NUMBER()over(order by tempcolumn) temprownumber,* from (select top '.$end.' tempcolumn=0,'.$fieldSql.' from '.$tableSql.$whereSql.$orderSql.') temptable1) temptable2 where temprownumber>'.$start;
        $rows = self::executeQuery(self::$SqlStr,$values);
        return $rows;
    }

    /**
     * 查询数据(单条)
     * @param $table
     * @param $field
     * @param $where
     * @param $order
     * @param null $values
     * @return bool
     */
    public static function fetchOne($table,$field,$where,$order,$values=null){
        if(empty($table)) return false;
        $tableSql = self::tableSql($table);
        $fieldSql = self::fieldSql($field);
        $whereSql = self::whereSql($where);
        $orderSql = self::orderSql($order);
        self::$SqlStr = 'select top 1 '.$fieldSql.' from '.$tableSql.$whereSql.$orderSql;
        $rows = self::executeQuery(self::$SqlStr,$values);
        if(!is_array($rows) || count($rows)!=1) return false;
        return $rows[0];
    }

    /**
     * 获取单个字段数据
     * @param $table
     * @param $name
     * @param string $def
     * @param null $where
     * @param null $order
     * @param null $values
     * @return string
     */
    public static function fetchField($table,$name,$def='',$where=null,$order=null,$values=null){
        if(empty($name)) return $def;
        $data = self::fetchOne($table,$name,$where,$order,$values);
        if(!is_array($data)) return $def;
        return $data[$name];
    }

    /**
     * 获取最后插入的数据ID
     * @param $table
     * @return int|string
     */
    public static function lastId($table){
        $sql = 'select top 1 IDENT_CURRENT(\'['.$table.']\') id';
        $rows = self::executeQuery($sql);
        if(!is_array($rows) || count($rows)!=1) return -1;
        $id = $rows[0]['id'];
        if(!is_numeric($id)) return -1;
        return $id;
    }

    /**
     * 获取最后执行的SQL语句
     * @return mixed
     */
    public static function lastSql(){
        return self::$SqlStr;
    }

    /**
     * 获取错误
     * @return mixed
     */
    public static function lastError(){
        return self::$ErrorMsg;
    }

    /**
     * 获取连接字串
     * @return mixed
     */
    public static function getDb(){
        return self::$DbLink;
    }

    /**
     * 关闭连接
     */
    public static function close(){
        if(is_resource(self::$DbLink)) sqlsrv_close(self::$DbLink);
        self::$DbLink = null;
    }

}
?>