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// For Read
// fetch read database connection that is used in Mage_Core module
$read= Mage::getSingleton('core/resource')->getConnection('core_read');
$value=$read->query("SE...");
$row = $value->fetch();

print_r($row); // As Array
 
  
// For Write
// fetch write database connection that is used in Mage_Core module
$write = Mage::getSingleton('core/resource')->getConnection('core_write');

// now $write is an instance of Zend_Db_Adapter_Abstract
$write->query("insert into tablename values ('aaa','bbb','ccc')");
 


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select * from ((select bill.id billId,bach.riskRate risk,bach.assureRate assure from AcptBillInfo bill,AcptBach  bach where bill.acptBatchId=bach.id and bill.rgctId=? )abach left outer join AcptSignMoney sig on abach.billId = sig.billId) ......

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ÅäÖÃÑ¡Ïî 'show advanced options' ÒÑ´Ó 1 ¸ü¸ÄΪ 1¡£ÇëÔËÐÐ RECONFIGURE Óï¾ä½øÐа²×°¡£
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Á´½Ó·þÎñÆ÷ "(null)" µÄ OLE DB ·ÃÎÊ ......

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select a.ClassName,a.CourseName,sum(²»¼°¸ñ) as ²»¼°¸ñ,sum(²î) as ²î,sum(ÖеÈ) as ÖеÈ,sum(ºÃ) as ºÃ ,sum(²»¼°¸ñ)+sum(²î)+sum(ÖеÈ)+sum(ºÃ) as °à¼¶×ÜÈËÊý from (select StudentID,ClassName,CourseName,1 as ²»¼°¸ñ,0 as ²î,0 as ÖеÈ,0 as ºÃ from StudentScore where ScoreRemark='fail' union all
select Stu ......

C#Á¬½ÓAccessºÍSQL ServerÊý¾Ý¿â

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Data.OleDb;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace Str
{
public partial class Form1 : F ......
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