OleDbDataAdapter 查询带条件就导致DataSet的Table[0]中无数据解决方案

OleDbDataAdapter 查询带条件就导致DataSet的Table[0]中无数据
我用的是vs2003
请看以下代码：

///   <summary>
///   获取适合当前子类的DataAdapter实例
///   </summary>
///   <param   name= "SQLString "> 构造该实例的SQL语句参数 </param>
///   <returns> </returns>
override   protected   System.Data.OleDb.OleDbDataAdapter   GetDataAdapter(string   SQLString)
{
System.Data.OleDb.OleDbDataAdapter   da   =   new   OleDbDataAdapter(SQLString,   dbConn   as   OleDbConnection);
if   (inTran)   da.SelectCommand.Transaction   =   dbTran   as   OleDbTransaction;
return   da   as   System.Data.OleDb.OleDbDataAdapter;
}


virtual   public   DataTable   ExecuteQuery(string   SQLString)
{
DataSet   ds   =   new   DataSet();
System.Data.OleDb.OleDbDataAdapter   da   =   GetDataAdapter(SQLString);
try
{
da.Fill(ds);
return   ds.Tables[0];
}
catch(Exception   ex)
{
if   (DBAccessOnError   !=   null)   DBAccessOnError(ex,   SQLString,   null);
return   null;
}
}

如果SQLString=“select   floors   from   ipmac”就能得到ds.Tables[0],ds.Tables[0].Rows=4

如果SQLString=“select   floors   from   ipmac   where   Regional   like   '*第1区域* '”就不能得到ds.Tables[0]，ds.Tables[0].Rows.count=0

其中以下语句在Access2003中执行查询
select   floors   from   ipmac   where   Regional   like   '*第1区域* '        
可获得2条记录


------解决方案--------------------------------------------------------
SQLString=“select floors from ipmac where Regional like '*第1区域* '
====================================================================
SQLString=“select floors from ipmac where Regional like '%第1区域% '