常用的PHP与SQL语句

<?php

$conn=mysql_connect("localhost","root","root");

mysql_select_db("db_database17",$conn);

mysql_query("set names gb2312");

?>

<?php

$sql1=mysql_query("select usernc,face,ip,email,qq from tb_user where id='".$info["userid"]."'",$conn);

$info1=mysql_fetch_array($sql1); 

echo $info1["face"];

?>

action="savereg.php"

<input type="text" name="usernc"

<input type="text" name="userpwd"

<input type="text" name="truename" 

<?php

if(mysql_query("insert into tb_user(usernc,userpwd,truename,email,qq,tel,ip,address,face,regtime,sex,usertype) values('".$usernc."','".md5(trim($_POST["userpwd"]))."','".$_POST["truename"]."','".$_POST["email"]."','".$_POST["qq"]."','".$_POST["tel"]."','".$ip."','".$_POST["address"]."','".$_POST["face"]."','".date("Y-m-d H:i:s")."','".$_POST["sex"]."','0')",$conn)){

if($_SESSION["unc"]!=""){

    session_unregister("unc");

   }

session_register("unc");

   $_SESSION["unc"]=$usernc;   

   echo "<script>alert('注册成功！');history.back();</script>";

}else{

   echo "<script>alert('注册失败！');history.back();</script>";

}

?>

<?php

    $sql=mysql_query("select count(*) as total from tb_leaveword ",$conn);//把查询的结果存入total中

    $info=mysql_fetch_array($sql);

    $total=$info[total];

    if($total==0){

     echo "<div align=center>对不起，暂无留言！</div>";

    }else{

      if(!isset($_GET["page"]) || !is_numeric($_GET["page"])){

         $page=1; 

      }else{

         $page=intval($_GET["page"]);

      }

      

      $pagesize=3;

      if($total%$pagesize==0){

         $pagecount=intval($total/$pagesize);

      }else{

         $pagecount=ceil($total/$pagesize);

      }

      $sql=mysql_query("select * from tb_leaveword order by createtime desc limit ".($page-1)*$pagesize.",$pagesize ",$conn);

      while($info=mysql_fetch_array($sql)){

     

      ?>

<table width="520" height="5" border="0" align="center" cellpadding="0" cellspacing="0">

      <tr>

        <td></td>

      </tr>

    </table>

      <table width="550" height="155" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#FCD424">

        <tr>

          <td bgcolor="#FFFFFF" valign="top"><table width="550" height="24" border="0" align="center" cellpadding="0" cellspacing="0">

            <tr>

              <td width="450" background="images/dh_back_1.gif">&nbsp;主&nbsp;&nbsp;题：<?php echo unhtml($info["title"]);?></td>

              <td width="100" background="images/dh_back_1.gif"><div align="center">

     <script language="javascript">

       function openeditwindow(x){

    

       window.open("editleaveword.php?id="+x,"newframe","top=100,left=200,width=450,height=280,menubar=no,location=no,scrollbars=no,status=no");

      

     }

     

     </script>

    <?php 

      $sqlu=mysql_query("select usernc from tb_user where id='".$info["userid"]."'",$conn);

      $infou=mysql_fetch_array($sqlu);

      if($infou["usernc"]==$_SESSION["unc"]){

    ?> 

       <a href="javascript:openeditwindow(<?php echo $info[id];?>)" class="a1">编辑</a>

    <?php

     }

    ?> 

    &nbsp;

    <?php

     if($_SESSION["unc"]!=""){

      $sqld=mysql_query("select usertype from tb_user where usernc='".$_SESSION["unc"]."'",$conn);

               $infod=mysql_fetch_array($sqld);

      if($infod["usertype"]==1){ 

     ?>

     <a href="javascript:if(window.confirm('确定删除该留言信息么？')==true){window.location.href='deleteleaveword.php?id=<?php echo $info[id];?>';}" class="a1">删除</a>

    <?php

      }

     }

    ?>

     </div></td>

            </tr>

          </table>

            <table width="550" height="5" border="0" align="center" cellpadding="0" cellspacing="0">

              <tr>

                <td></td>

              </tr>

            </table>

   

    <table width="550" height="120" border="0" align="center" cellpadding="0" cellspacing="0">

              <tr>

                <td width="150" height="90"><div align="center"><img src="<?php

     $sql1=mysql_query("select usernc,face,ip,email,qq from tb_user where id='".$info["userid"]."'",$conn);

     $info1=mysql_fetch_array($sql1); 

     echo $info1["face"];

     

     ?>" /><br><?php echo $info1["usernc"];?></div></td>

                <td width="10" background="images/line_down.gif"></td>

                <td width="390" rowspan="2"><?php echo unhtml($info["content"]);?></td>

              </tr>

              <tr>

                <td height="30"><div align="center"><img src="images/email.gif" width="45" height="16" alt="<?php echo $info1[email];?>"/><img src="images/ip.gif" width="55" height="16" alt="<?php echo $info1[ip];?>"/><img src="images/qq.gif" width="45" height="16" alt="<?php echo $info1[qq];?>"/></div></td>

                <td width="10" background="images/line_down.gif"></td>

              </tr>

            </table>

   

    </td>

        </tr>

      </table>

    <?php

    }

    }

   ?>

   

   

   

    <table width="550" height="25" border="0" align="center" cellpadding="0" cellspacing="0">

         <tr>

           <td width="351"><div align="left">共有留言&nbsp;<?php echo $total;?>&nbsp;条&nbsp;每页显示&nbsp;<?php echo $pagesize;?>&nbsp;条&nbsp;第&nbsp;<?php echo $page;?>&nbsp;页/共&nbsp;<?php echo $pagecount;?>&nbsp;页</div></td>

           

           <td width="199"><div align="right"><a href="<?php echo $_SERVER["PHP_SELF"]?>?page=1" class="a1">首页</a>&nbsp;<a href="<?php echo $_SERVER["PHP_SELF"]?>?page=<?php 

   if($page>1) 

    

     echo $page-1;

    else

     echo 1; 

     ?>" class="a1">上一页</a>&nbsp;<a href="<?php echo $_SERVER["PHP_SELF"]?>?page=<?php 

   if($page<$pagecount) 

    

     echo $page+1;

    else

     echo $pagecount; 

     ?>