PHP SQL Server 数据库操作类

<?php
/*MSSql的操作类*/  
class MSSql {
    var $link;
    var $querynum = 0;
  
    /*连接MSSql数据库，参数：dbsn->数据库服务器地址，dbun->登陆用户名，dbpw->登陆密码，dbname->数据库名字*/  
    function Connect($dbsn, $dbun, $dbpw, $dbname) {
        if($this->link = @mssql_connect($dbsn, $dbun, $dbpw, true)) {
            $query = $this->Query('SET TEXTSIZE 2147483647');
            if (@mssql_select_db($dbname, $this->link)) {
            } else {
                $this->halt('Can not Select DataBase');
            }
        } else {
            $this->halt('Can not connect to MSSQL server');
        }
    }
  
    /*执行sql语句，返回对应的结果标识*/  
    function Query($sql) {
        if($query = @mssql_query($sql, $this->link)) {
            $this->querynum++;
            return $query;
        } else {
            $this->querynum++;
            $this->halt('MSSQL Query Error', $sql);
        }
    }
  
    /*执行Insert Into语句，并返回最后的insert操作所产生的自动增长的id*/  
    function Insert($table, $iarr) {
        $value = $this->InsertSql($iarr);
        $query = $this->Query('INSERT INTO ' . $table . ' ' . $value . '; SELECT SCOPE_IDENTITY() AS [insertid];');
        $record = $this->GetRow($query);
        $this->Clear($query);
        return $record['insertid'];
    }
  
    /*执行Update语句，并返回最后的update操作所影响的行数*/  
    function Update($table, $uarr, $condition = '') {
        $value = $this->UpdateSql($uarr);
        if ($condition) {
            $condition = ' WHERE ' . $condition;
        }
        $query = $this->Query('UPDATE ' . $table . ' SET ' . $value . $condition . '; SELECT @@ROWCOUNT AS [rowcount];');
        $record = $this->GetRow($query);
        $this->Clear($query);
        return $record['rowcount'];
    }
  
    /*执行Delete语句，并返回最后的Delete操作所影响的行数*/  
    function Delete($table, $condition = '') {
        if ($condition) {
            $condition = ' WHERE ' . $condition;
        }
        $query = $this->Query('DELETE ' . $table . $condition . '; SELECT @@ROWCOUNT AS [rowcount];');
        $record = $this->GetRow($query);
        $this->Clear($query);
        return $record['rowcount'];
    }
  
    /*将字符转为可以安全保存的mssql值，比如a'a转为a''a*/  
    function EnCode($str) {
        return str_replace("'","''", $str);
    }
  
    /*将可以安全保存的mssql值转为正常的值，比如a''a转为a'a */
    function DeCode($str) {
        return str_replace("''", "'", $str);
    }
  
    /*将对应的列和值生成对应的insert语句，如：array('id' => 1, 'name' => 'name')返回([id], [name]) VALUES (1, 'name')*/  
    function InsertSql($iarr) {
        if (is_array($iarr)) {
            $fstr = '';
            $vstr = '';
            foreach ($iarr as $key => $val) {
                $fstr .= '[' . $key . '], ';
                $vstr .= ''' . $val . '', ';
            }
            if ($fstr) {
                $fstr = '(' . substr($fstr, 0, -2) . ')';
                $vstr = '(' . substr($vstr, 0, -2) . ')';
                return $fstr . ' VALUES ' . $vstr;
            } else {
                return '';
            }
        } else {
            return '';
        }
    }
  
    /*将对应的列和值生成对应的insert语句，如：array('id' => 1, 'name' => 'name')返回[id] = 1, [name] = 'name'*/  
    function UpdateSql($uarr) {
        if (is_array($uarr)) {
            $ustr = '';
            foreach ($uarr as $key => $val) {
                $ustr .= '[' . $key . '] = '' . $val . '', ';
            }
            if ($ustr) {
                return substr($ustr, 0, -2);
            } else {
                return '';
            }
        } else {
            return '';
        }
    }
  
    /*返回对应的查询标识的结果的一行*/  
    function GetRow($query, $result_type = MSSQL_ASSOC) {
        return mssql_fetch_array($query, $result_type);
    }
  
    /*清空查询结果所占用的内存资源*/  
    function Clear($query) {
        return mssql_free_result($query);
    }
  
    /*关闭数据库*/  
    function Close() {
        return mssql_close($this->link);
    }
  
    function halt($message = '', $sql = '') {
        $message .= '<br />MSSql Error:' . mssql_get_last_message();
        if ($sql) {
            $sql = '<br />sql:' . $sql;
        }
        exit("DataBase Error.<br />Message:$message $sql");
    }
}
?>