MYSQL的操作类（已封装）

return $aResult[$nFields];
}
if(is_string($nFields))
{
$nFields=strtolower($nFields);
for($i=0;$i<$this->nCols;$i++)
{
if($this->aFName[$i]==$nFields)
break;
}
if($i==$this->nCols)
{
$this->nErr=1;
$this->sErr="GetValue:所请求的列不存在，请仔细检查！";
return;
}
return $aResult[$i];
}
return $aResult;
}
function AddNew($TableName="") //标志开始添加数据
{
$this->Initialize();
if(!empty($TableName))
$this->sTName=$TableName;
if($this->NewEdit>0)
{
$this->nErr=1;
$this->sErr="AddNew:你正在对数据库进行添加或更新操作！";
return;
}
if(empty($this->sTName))
{
$this->nErr=1;
$this->sErr="AddNew:想要添加的数据库表为空，可以在构造时指定，也可在AddNew()时指定！";
return;
}
unset($this->aNew);
$this->aNew=array();
$this->NewEdit=1;
$strSQL="select * from ".$this->sTName;
$this->sSQL=$strSQL;
if(!$this->nResult=mysql_query($strSQL))
{
$this->nErr=1;
$this->sErr="AddNew:SQL语句：".strSQL."<br><br>MySql错误：".mysql_error();
return;
}
$this->nCols=mysql_num_fields($this->nResult);
unset($this->aFName);
$this->aFName=array();
for($i=0;$i<$this->nCols;$i++)
$this->aFName[$i]=strtolower(mysql_field_name($this->nResult,$i));
}
function Edit($Condition="",$TableName="") //对指定数据库表进行编辑
{
$this->Initialize();
if(!empty($TableName))
$this->sTName=$TableName;
$this->sEditCon=$Condition;
if(empty($this->sTName))
{
$this->nErr=1;
$this->sErr="Edit:在编辑前请先指定数据库表！";
return;
}
unset($this->aNew);
$this->aNew=array();
$this->NewEdit=2;
$strSQL="select * from ".$this->sTName;
$this->sSQL=$strSQL;
if(!$this->nResult=mysql_query($strSQL))
{
$this->nErr=1;
$this->sErr="Edit:SQL语句：".strSQL."<br><br>MySql错误：".mysql_error();
return;
}
$this->nCols=mysql_num_fields($this->nResult);
unset($this->aFName);
$this->aFName=array();
for($i=0;$i<$this->nCols;$i++)
$this->aFName[$i]=strtolower(mysql_field_name($this->nResult,$i));
}
function SetValue($Index,$Value) //指定数据，跟在AddNew后执行;
{
if($this->NewEdit==0)
{
$this->nErr=1;
$this->sErr="SetValue:请先执行AddNew()或者Edit()！";
return;
}
if(is_int($Index))
{
if($Index<0||$Index>$this->nCols)
{
$this->nErr=1;
$this->sErr="SetValue:插入不存在的列值！";
return;
}
$this->aNew[$Index]=$Value;
$tmpIn=$Index;
}
elseif(is_string($Index))
{
$Index=strtolower($Index);
for($i=0;$i<$this->nCols;$i++)
{
if($this->aFName[$i]==$Index)
break;
}
if($i==$this->nCols)
{
$this->nErr=1;
$this->sErr="SetValue:插入不存在的列值！";
return;
}
$this->aNew[$i]=$Value;
$tmpIn=$i;
}
if(!empty($this->sName))
$this->sName.=",";
$this->sName.=$this->aFName[$tmpIn];
//根据当前字段的类型生成相应的新值
if($this->sValue!="#@!")
$this->sValue.=",";
else
$this->sValue="";
$ftype=@mysql_field_type($this->nResult,$i);
//echo($ftype.",".$this->aNew[$i].",".$i.":".$sValue."<br>");
switch($ftype)
{
case "string":
case "date":
case "datetime":
$this->sValue.=""".$this->aNew[$tmpIn].""";
$this->sEdit=""".$this->aNew[$tmpIn].""";
break;
case "int":
case "unknown":
$this->sValue.=$this->aNew[$tmpIn];
$this->sEdit=$this->aNew[$tmpIn];
break;
default:
$this->nErr=1;
$this->sErr="Update:字段名为".$this->aFName[$tmpIn]."的".$ftype."类型目前版本不支持，请用别的方法添加数据！";
return;
}
if($this->NewEdit==2)
$this->sName.="=".$this->sEdit;
}
function Update() //存储新值到数据库
{
$strSQL="";
if($this->NewEdit==0)
{
$this->nErr=1;
$this->sErr="Update:请先执行AddNew()或者Edit()，再用SetValue()添加值！";
return;
}
if(empty($this->sValue))
{
$this->nErr=1;
$this->sErr="Update:在数据为空的情况下，不能添加或修改数据！";
return;
}
switch($this->NewEdit)
{
case 1: //添加
$strSQL="insert into ";
$strSQL.=$this->sTName;
$strSQL.=" (".$this->sName.") ";
$strSQL.="values (".$this->sValue.")";
break;
case 2: //修改
$strSQL="update ";
$strSQL.=$this->sTName;
$strSQL.=" set ";
$strSQL.=$this->sName;
if(!empty($this->sEditCon))
$strSQL.=" where ".$this->sEditCon;
break;
default:
$this->nErr=1;
$this->sErr="Update:Update()生成SQL语句出错，请检查！";
return;
}
$this->sSQL=$strSQL;
if(!$this->nResult=mysql_query($strSQL))
{
$this->nErr=1;
$this->sErr="Update:SQL语句：".$strSQL."<br><br>MySql错误：".mysql_error();
return;
}
//echo($this->sSQL."<br>");
//作清理工作
$this->NewEdit=0;
unset($this->aNew);
mysql_query("commit");
}
}