初学入门PHP和MySQL(2)
时间：2007-02-17 来源：PHP爱好者
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假设你对表单很熟悉，这是一个相当简单的脚本。我们根据html页面设计了一个表单，它在提交后调用
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add2tbl.php3脚本。现在，表单与MySQL表相对应由4个字段组成：index number，FirstName，LastName和
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FreeText。注意在这个表单中字段名字与MySQL表中字段名一样，但这只是为了方便起见而不是必须。
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我们再一次使用了include命令<? include ('links.x');?>（象在前面所解释的）来增加链接。
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让我们看一下add2tbl.php3脚本：
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<html>
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<body>
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<?
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if ($UserName)
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{
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mysql_connect() or die ("Problem connecting to DataBase");
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$query = "insert into tbl values ('$idx','$UserName','$LastName','$FreeText')";
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$result = mysql_db_query("example", $query);
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echo "Data inserted. new table:<br><p></p>";
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$query = "SELECT * FROM tbl";
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$result = mysql_db_query("example", $query);
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if ($result)
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{
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echo "<table width=90% align=center border=1><tr>
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<td align=center bgcolor=#00FFFF>idx</td>
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<td align=center bgcolor=#00FFFF>User Name</td>
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<td align=center bgcolor=#00FFFF>Last Name</td>
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<td align=center bgcolor=#00FFFF>Free Text</td>
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</tr>";
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while ($r = mysql_fetch_array($result))
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{
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$idx = $r["idx"];
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$user = $r["UserName"];
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$last = $r["LastName"];
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$free = $r["FreeText"];
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echo "<tr>
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<td>$idx</td>
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<td>$user</td>
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<td>$last</td>
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<td>$free</td>
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</tr>";
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} // while循环结束
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echo "</table>";
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}
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else
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{
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echo "No data.";
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} // if结束($result)
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}
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else
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{
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echo "No UserName Entered. Please go back and reenter UserName";
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} // if结束($UserName)
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echo "<p></p>";
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include ('links.x');
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?>
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</body>
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</html>--------------------------------------------------------------------------------
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解释：
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这一部分包含两个主要部分。第一部分从前一个表单中得到数据，并将它们插入到数据库中。第二部分
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从数据库中打印出表的内容。第二部分同我在查看数据库部分中所演示的一样。
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第一部分：
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首先我们象通常一样使用mysql_connect()来同数据库连接。
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然后我们使用下面查询：
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$query = "insert into tbl values ('$idx','$','$LastName','$FreeText')";
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这个查询使用从前面表单传递过来的$idx，$UserName，$LastName和$FreeTExt变量，并将它们插入到
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tbl表中。
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注意，我在脚本中所作的注释。使用一个注释可以用"//"，服务器将忽略此行的后面部分。
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简单，不是吗？
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从数据库中编辑一条记录：
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让我们假设一下，我们想修改数据库中存在的记录。在前面，我们看到有一个叫set的SQL命令用来设置
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数据库中存在字段的值。我们将使用这个命令来修改数据库中的整条记录。
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考虑下面的脚本：
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edit.php3:
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<html>
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<head><title>Editing an entry from the database</title>
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</head>
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<body bgcolor=#ffffff>
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<h1>Edit an entry</h1
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<?
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mysql_connect() or die ("Problem connecting to DataBase");
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$query = "select * from tbl";
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$result = mysql_db_query("example", $query);
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if ($result)
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{
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echo "Found these entries in the database:<br>";
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echo "<table width=90% align=center border=1><tr>
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<td align=center bgcolor=#00ffff>idx</td>
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<td align=center bgcolor=#00FFFF>User Name</td>
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<td align=center bgcolor=#00FFFF>Last Name</td>
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<td align=center bgcolor=#00FFFF>Free Text</td>
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</tr>";
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while ($r = mysql_fetch_array($result))
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{
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$idx = $r["idx"];
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$user = $r["UserName"];
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$last = $r["LastName"];
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$text = $r["FreeText"];
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echo "<tr>
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<td align=center>
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<a href="editing.php3?idx=$idx&user=$user&last=$last&text=$text">$idx</a></td>
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<td>$user</td>
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<td>$last</td>
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<td>$text</td>
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</tr>";
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}
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echo "</table>";
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}
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else
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{
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echo "No data.";
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}
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mysql_free_result($result);
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include ('links.x');
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?>
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</body>
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</html>--------------------------------------------------------------------------------
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如你所见，这里的代码有些熟悉。第一部分只是打印出数据库中表的内容。注意，有一行不太一样：
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<a href="editing.php3?idx=$idx&user=$user&last=$last&text=$text">$idx</a>
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这一行建立了一个到editing.php3的一个链接，并且给新的脚本传递了一些变量。同表单方式很象，只
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是使用的是链接。我们将信息转换成：变量和值。注意，为了打印出 " 符号，我们需要使用 "否则服务器
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将把它看成PHP脚本的一部分并且作为被打印的信息。
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我们想将数据库中的记录全部转换到过，这样我们就可以得到表中的确切的数据，以便我们修改它容易
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一些。
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Editing.php3:
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<html>
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<head><title>Editing an entry</title>
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</head>
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<body bgcolor=#ffffff>
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<h1>Editing an entry</h1>
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<form method="post" action="editdb.php3">
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<table width=90% align=center>
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<tr><td>idx:</td><td><?php echo "$idx";?></td></tr>
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<tr><td>UserName:</td><td><input type=text name=UserName size=40 maxlength=100
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value="<?php echo "$user";?>"></td></tr>
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<tr><td>LastName:</td><td><input type=text name=LastName size=40 maxlength=100
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value="<?php echo "$last";?>"></td></tr>
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<tr><td>Free Text:</td><td><input type=text name=FreeText size=40 maxlength=100
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value="<?php echo "$text";?>"></td></tr>
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<tr><td></td><td><input type=submit value="Edit it!"></td></tr></table>
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<input type=hidden name=idx value="<?php echo "$idx";?>">
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</form>
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<?php include ('links.x');?>
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</body>
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</html>--------------------------------------------------------------------------------
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好，这个脚本很简单。我们要关心的是，当表单打印出来时，它记录了当前记录的数据，通过在 <input
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type= > 命令中的value属性。这些数据是从前一个页面传递过来的。
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现在，如果我们不改变记录的信息，它将传回当前值，即缺省值。如果我们改变了字段的值，字段的值
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将变成新的值。接着我们可以将新值传给另一个脚本，它将会改变MySQL表中的值。
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--------------------------------------------------------------------------------
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editdb.php3:
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<?php
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mysql_connect() or die ("Problem connecting to DataBase");
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$query = "update tbl set
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idx='$idx',UserName='$UserName',LastName='$LastName',FreeText='$FreeText' where
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idx='$idx'";
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$result = mysql_db_query("example", $query);
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$query = "SELECT * FROM tbl";
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$result = mysql_db_query("example", $query);
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if ($result)
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{
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echo "Found these entries in the database:<br><p></p>";
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echo "<table width=90% align=center border=1><tr>
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<td align=center bgcolor=#00FFFF>idx</td>
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<td align=center bgcolor=#00FFFF>User Name</td>
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<td align=center bgcolor=#00FFFF>Last Name</td>
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<td align=center bgcolor=#00FFFF>Free Text</td>
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</tr>";
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while ($r = mysql_fetch_array($result))
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
{
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$idx = $r["idx"];
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$user = $r["UserName"];
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$last = $r["LastName"];
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$text = $r["FreeText"];
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echo "<tr>
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<td>$idx</td>
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<td>$user</td>
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<td>$last</td>
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<td>$text</td>
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</tr>";
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}
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echo "</table>";
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}
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else
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{
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echo "No data.";
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}
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mysql_free_result($result);
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include ('links.x');
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?>--------------------------------------------------------------------------------
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基本上要关心的一件事情是下面一行：
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$query = "update tbl set idx='$idx',UserName='$UserName',LastName='$LastName',FreeText='$FreeText' where idx='$idx'";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
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注意，它与我们在前面MySQL部分解释的语法相同。另一件事，注意这个脚本改变的是idx=$idx的记录，
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如果表中有多条idx等于$idx的记录，所以这些记录都将被改变。如果我们想更严格一些，我们可以象下面
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改动一下where子句：
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$query = "update tbl set idx='$idx',UserName='$UserName', LastName='$LastName',FreeText='$FreeText' where idx='$idx' and UserName='$UserName' and LastName='$LastName' and FreeText='$FreeText'";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
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这个语法将检查所有的字段，而不仅仅是检查idx。
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从数据库中删除一条记录：
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好，删除很容易。我们仍然需要两个脚本：一个用来选择要删除的记录（基本上同上面选择要编辑的记
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录一样），一个用来真正地进行删除和打印新的表格。
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--------------------------------------------------------------------------------
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del.php3:
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<html>
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<head><title>Deleting an entry from the database</title>
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</head>
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<body bgcolor=#ffffff>
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<h1>Del an entry</h1>
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<?
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mysql_connect() or die ("Problem connecting to DataBase");
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$query = "select * from tbl";
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$result = mysql_db_query("example", $query);
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if ($result)
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
{
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echo "Found these entries in the database:<br><p></p>";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
echo "<table width=90% align=center border=1><tr>
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<td align=center bgcolor=#00ffff>idx</td>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<td align=center bgcolor=#00FFFF>User Name</td>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<td align=center bgcolor=#00FFFF>Last Name</td>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<td align=center bgcolor=#00FFFF>Free Text</td>
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</tr>";
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while ($r = mysql_fetch_array($result))
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
{
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$idx = $r["idx"];
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$user = $r["UserName"];
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$last = $r["LastName"];
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$text = $r["FreeText"];
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echo "<tr>
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<td align=center>
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<a href="dele.php3?
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idx=$idx&UserName=$user&LastName=$last&FreeText=$text">$idx</a></td>
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<td>$user</td>
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<td>$last</td>
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<td>$dtext</td>
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</tr>";
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}
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echo "</table>";
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}
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else
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
{
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echo "No data.";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
}
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
mysql_free_result($result);
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include ('links.x');
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?>
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</body>
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</html>
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--------------------------------------------------------------------------------
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这个脚本与我们用过的编辑脚本很象，所以可以看一下那里的说明。
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--------------------------------------------------------------------------------
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dele.php3:
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<?php
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ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
mysql_connect() or die ("Problem connecting to DataBase");
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$query = "delete from tbl where idx='$idx' and UserName='$UserName' and
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
LastName='$LastName' and FreeText='$FreeText'";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$result = mysql_db_query("example", $query);
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$query = "SELECT * FROM tbl";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$result = mysql_db_query("example", $query);
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ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
if ($result)
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
{
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
echo "Found these entries in the database:<br><p></p>";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
echo "<table width=90% align=center border=1><tr>
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<td align=center bgcolor=#00FFFF>idx</td>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<td align=center bgcolor=#00FFFF>User Name</td>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<td align=center bgcolor=#00FFFF>Last Name</td>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<td align=center bgcolor=#00FFFF>Free Text</td>
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</tr>";
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ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
while ($r = mysql_fetch_array($result))
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
{
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$idx = $r["idx"];
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$user = $r["UserName"];
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$last = $r["LastName"];
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$text = $r["FreeText"];
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
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echo "<tr>
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<td>$idx</td>
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<td>$user</td>
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<td>$last</td>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<td>$text</td>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
</tr>";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
}
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
echo "</table>";
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}
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else
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
{
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
echo "No data.";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
}
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
mysql_free_result($result);
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
include ('links.x');
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
?>--------------------------------------------------------------------------------
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
这个脚本看上去很熟悉，唯一不同的就是删除查询的语法：
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$query = "delete from tbl where idx='$idx' and UserName='$UserName' and LastName='$LastName' and FreeText='$FreeText'";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
这个查询将会删除所有与前面的脚本传递来的信息相配匹的记录。容易吧。
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
好了，这就是全部内容了。
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ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
转自WeberDev.com
php爱好者站 http://www.phpfans.net PHP|MySQL|javascript|ajax|html.
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
假设你对表单很熟悉，这是一个相当简单的脚本。我们根据html页面设计了一个表单，它在提交后调用
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
add2tbl.php3脚本。现在，表单与MySQL表相对应由4个字段组成：index number，FirstName，LastName和
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
FreeText。注意在这个表单中字段名字与MySQL表中字段名一样，但这只是为了方便起见而不是必须。
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
我们再一次使用了include命令<? include ('links.x');?>（象在前面所解释的）来增加链接。
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
让我们看一下add2tbl.php3脚本：
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
--------------------------------------------------------------------------------
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<html>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<body>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<?
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
if ($UserName)
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
{
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
mysql_connect() or die ("Problem connecting to DataBase");
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$query = "insert into tbl values ('$idx','$UserName','$LastName','$FreeText')";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$result = mysql_db_query("example", $query);
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
echo "Data inserted. new table:<br><p></p>";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$query = "SELECT * FROM tbl";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$result = mysql_db_query("example", $query);
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
if ($result)
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
{
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
echo "<table width=90% align=center border=1><tr>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<td align=center bgcolor=#00FFFF>idx</td>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<td align=center bgcolor=#00FFFF>User Name</td>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<td align=center bgcolor=#00FFFF>Last Name</td>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<td align=center bgcolor=#00FFFF>Free Text</td>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
</tr>";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
while ($r = mysql_fetch_array($result))
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
{
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$idx = $r["idx"];
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$user = $r["UserName"];
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$last = $r["LastName"];
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$free = $r["FreeText"];
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
echo "<tr>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<td>$idx</td>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<td>$user</td>
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<td>$last</td>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<td>$free</td>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
</tr>";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
} // while循环结束
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
echo "</table>";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
}
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
else
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
{
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
echo "No data.";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
} // if结束($result)
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
}
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
else
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
{
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
echo "No UserName Entered. Please go back and reenter UserName";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
} // if结束($UserName)
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echo "<p></p>";
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include ('links.x');
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?>
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</body>
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</html>--------------------------------------------------------------------------------
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解释：
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这一部分包含两个主要部分。第一部分从前一个表单中得到数据，并将它们插入到数据库中。第二部分
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从数据库中打印出表的内容。第二部分同我在查看数据库部分中所演示的一样。
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第一部分：
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首先我们象通常一样使用mysql_connect()来同数据库连接。
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然后我们使用下面查询：
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$query = "insert into tbl values ('$idx','$','$LastName','$FreeText')";
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这个查询使用从前面表单传递过来的$idx，$UserName，$LastName和$FreeTExt变量，并将它们插入到
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
tbl表中。
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注意，我在脚本中所作的注释。使用一个注释可以用"//"，服务器将忽略此行的后面部分。
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简单，不是吗？
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从数据库中编辑一条记录：
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让我们假设一下，我们想修改数据库中存在的记录。在前面，我们看到有一个叫set的SQL命令用来设置
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数据库中存在字段的值。我们将使用这个命令来修改数据库中的整条记录。
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考虑下面的脚本：
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--------------------------------------------------------------------------------
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edit.php3:
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<html>
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<head><title>Editing an entry from the database</title>
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</head>
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<body bgcolor=#ffffff>
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<h1>Edit an entry</h1
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<?
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mysql_connect() or die ("Problem connecting to DataBase");
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$query = "select * from tbl";
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$result = mysql_db_query("example", $query);
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if ($result)
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{
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echo "Found these entries in the database:<br>";
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echo "<table width=90% align=center border=1><tr>
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<td align=center bgcolor=#00ffff>idx</td>
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<td align=center bgcolor=#00FFFF>User Name</td>
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<td align=center bgcolor=#00FFFF>Last Name</td>
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<td align=center bgcolor=#00FFFF>Free Text</td>
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</tr>";
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while ($r = mysql_fetch_array($result))
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{
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$idx = $r["idx"];
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$user = $r["UserName"];
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$last = $r["LastName"];
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$text = $r["FreeText"];
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echo "<tr>
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<td align=center>
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<a href="editing.php3?idx=$idx&user=$user&last=$last&text=$text">$idx</a></td>
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<td>$user</td>
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<td>$last</td>
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<td>$text</td>
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</tr>";
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}
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echo "</table>";
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}
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else
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{
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echo "No data.";
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}
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mysql_free_result($result);
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include ('links.x');
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?>
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</body>
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</html>--------------------------------------------------------------------------------
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如你所见，这里的代码有些熟悉。第一部分只是打印出数据库中表的内容。注意，有一行不太一样：
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<a href="editing.php3?idx=$idx&user=$user&last=$last&text=$text">$idx</a>
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这一行建立了一个到editing.php3的一个链接，并且给新的脚本传递了一些变量。同表单方式很象，只
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是使用的是链接。我们将信息转换成：变量和值。注意，为了打印出 " 符号，我们需要使用 "否则服务器
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将把它看成PHP脚本的一部分并且作为被打印的信息。
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我们想将数据库中的记录全部转换到过，这样我们就可以得到表中的确切的数据，以便我们修改它容易
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一些。
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--------------------------------------------------------------------------------
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Editing.php3:
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<html>
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<head><title>Editing an entry</title>
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</head>
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<body bgcolor=#ffffff>
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<h1>Editing an entry</h1>
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<form method="post" action="editdb.php3">
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<table width=90% align=center>
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<tr><td>idx:</td><td><?php echo "$idx";?></td></tr>
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<tr><td>UserName:</td><td><input type=text name=UserName size=40 maxlength=100
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value="<?php echo "$user";?>"></td></tr>
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<tr><td>LastName:</td><td><input type=text name=LastName size=40 maxlength=100
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value="<?php echo "$last";?>"></td></tr>
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<tr><td>Free Text:</td><td><input type=text name=FreeText size=40 maxlength=100
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value="<?php echo "$text";?>"></td></tr>
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<tr><td></td><td><input type=submit value="Edit it!"></td></tr></table>
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<input type=hidden name=idx value="<?php echo "$idx";?>">
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</form>
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<?php include ('links.x');?>
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</body>
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</html>--------------------------------------------------------------------------------
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好，这个脚本很简单。我们要关心的是，当表单打印出来时，它记录了当前记录的数据，通过在 <input
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type= > 命令中的value属性。这些数据是从前一个页面传递过来的。
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ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
现在，如果我们不改变记录的信息，它将传回当前值，即缺省值。如果我们改变了字段的值，字段的值
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将变成新的值。接着我们可以将新值传给另一个脚本，它将会改变MySQL表中的值。
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--------------------------------------------------------------------------------
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editdb.php3:
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<?php
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mysql_connect() or die ("Problem connecting to DataBase");
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$query = "update tbl set
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
idx='$idx',UserName='$UserName',LastName='$LastName',FreeText='$FreeText' where
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
idx='$idx'";
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$result = mysql_db_query("example", $query);
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$query = "SELECT * FROM tbl";
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$result = mysql_db_query("example", $query);
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if ($result)
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
{
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echo "Found these entries in the database:<br><p></p>";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
echo "<table width=90% align=center border=1><tr>
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<td align=center bgcolor=#00FFFF>idx</td>
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<td align=center bgcolor=#00FFFF>User Name</td>
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<td align=center bgcolor=#00FFFF>Last Name</td>
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<td align=center bgcolor=#00FFFF>Free Text</td>
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</tr>";
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while ($r = mysql_fetch_array($result))
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{
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$idx = $r["idx"];
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$user = $r["UserName"];
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$last = $r["LastName"];
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$text = $r["FreeText"];
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echo "<tr>
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<td>$idx</td>
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<td>$user</td>
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<td>$last</td>
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<td>$text</td>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
</tr>";
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}
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echo "</table>";
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}
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else
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{
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echo "No data.";
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}
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mysql_free_result($result);
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include ('links.x');
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?>--------------------------------------------------------------------------------
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基本上要关心的一件事情是下面一行：
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ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$query = "update tbl set idx='$idx',UserName='$UserName',LastName='$LastName',FreeText='$FreeText' where idx='$idx'";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
注意，它与我们在前面MySQL部分解释的语法相同。另一件事，注意这个脚本改变的是idx=$idx的记录，
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
如果表中有多条idx等于$idx的记录，所以这些记录都将被改变。如果我们想更严格一些，我们可以象下面
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改动一下where子句：
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ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
$query = "update tbl set idx='$idx',UserName='$UserName', LastName='$LastName',FreeText='$FreeText' where idx='$idx' and UserName='$UserName' and LastName='$LastName' and FreeText='$FreeText'";
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
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这个语法将检查所有的字段，而不仅仅是检查idx。
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
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从数据库中删除一条记录：
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ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
好，删除很容易。我们仍然需要两个脚本：一个用来选择要删除的记录（基本上同上面选择要编辑的记
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录一样），一个用来真正地进行删除和打印新的表格。
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--------------------------------------------------------------------------------
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del.php3:
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ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<html>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<head><title>Deleting an entry from the database</title>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
</head>
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
ww w.china it power.coCDawQQSTtbKTCvm9HYUSLfWSF
<body bgcolor=#ffffff>
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<h1>Del an entry</h1>
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<?
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mysql_connect() or die ("Problem connecting to DataBase");
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$query = "select * from tbl";
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$result = mysql_db_query("example", $query);
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if ($result)
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{
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echo "Found these entries in the database:<br><p></p>";
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echo "<table width=90% align=center border=1><tr>
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<td align=center bgcolor=#00ffff>idx</td>
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<td align=center bgcolor=#00FFFF>User Name</td>
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<td align=center bgcolor=#00FFFF>Last Name</td>
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<td align=center bgcolor=#00FFFF>Free Text</td>
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</tr>";
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while ($r = mysql_fetch_array($result))
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{
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$idx = $r["idx"];
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$user = $r["UserName"];
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$last = $r["LastName"];
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$text = $r["FreeText"];
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echo "<tr>
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<td align=center>
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<a href="dele.php3?
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idx=$idx&UserName=$user&LastName=$last&FreeText=$text">$idx</a></td>
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<td>$user</td>
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<td>$last</td>
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<td>$dtext</td>
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</tr>";
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}
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echo "</table>";
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}
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else
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{
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echo "No data.";
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}
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mysql_free_result($result);
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include ('links.x');
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?>
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</body>
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</html>
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--------------------------------------------------------------------------------
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这个脚本与我们用过的编辑脚本很象，所以可以看一下那里的说明。
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--------------------------------------------------------------------------------
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dele.php3:
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<?php
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mysql_connect() or die ("Problem connecting to DataBase");
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$query = "delete from tbl where idx='$idx' and UserName='$UserName' and
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LastName='$LastName' and FreeText='$FreeText'";
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$result = mysql_db_query("example", $query);
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$query = "SELECT * FROM tbl";
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$result = mysql_db_query("example", $query);
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if ($result)
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{
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echo "Found these entries in the database:<br><p></p>";
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echo "<table width=90% align=center border=1><tr>
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<td align=center bgcolor=#00FFFF>idx</td>
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<td align=center bgcolor=#00FFFF>User Name</td>
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<td align=center bgcolor=#00FFFF>Last Name</td>
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<td align=center bgcolor=#00FFFF>Free Text</td>
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</tr>";
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while ($r = mysql_fetch_array($result))
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{
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$idx = $r["idx"];
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$user = $r["UserName"];
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$last = $r["LastName"];
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$text = $r["FreeText"];
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echo "<tr>
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<td>$idx</td>
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<td>$user</td>
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<td>$last</td>
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<td>$text</td>
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</tr>";
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}
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echo "</table>";
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}
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else
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{
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echo "No data.";
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}
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mysql_free_result($result);
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include ('links.x');
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?>--------------------------------------------------------------------------------
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这个脚本看上去很熟悉，唯一不同的就是删除查询的语法：
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$query = "delete from tbl where idx='$idx' and UserName='$UserName' and LastName='$LastName' and FreeText='$FreeText'";
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这个查询将会删除所有与前面的脚本传递来的信息相配匹的记录。容易吧。
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好了，这就是全部内容了。
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转自WeberDev.com
php爱好者站 http://www.phpfans.net PHP|MySQL|javascript|ajax|html.
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