1.select语句查询信息(实现模糊查询)
<form name="form1" method="post" action="">
<input name="txt_keyword" type="text" id="txt_keyword" size="40">
<input name="Submit" type="submit" class="btn_grey" value="搜索" onclick="return check(form)">
</form>
<script type="text/javascript">
function check(form){
if(form.txt_keyword.value==""){
alert("请输入查找关键字！");
form.txt_keyword.focus();
return false;
}
form.submit(); //提交表单
}
</script>
<?php
$conn=mysql_connect("localhost"，"root"，"root")or die("数据库连接错误".mysql_error()); //连接数据库
mysql_select_db("testphp"，$conn)or die("数据库访问错误".mysql_error());  //选择数据库
mysql_query("set names 'utf8'");         //选择编码格式
$keyword=$_POST[txt_keyword];            //获取输入的关键词
$sql=mysql_query("select * from tb_affiche where title like '%$keyword%' or content like '%$keyword%'"); //执行查询语句
$row=mysql_fetch_object($sql); //获取查询结果集
if(!$row){         //判断查询结果集是否存在，不存在返回true
echo "<font color='red'>你搜索的信息不存在！</font>";
}
do{                                   //do...while输出查询结果
?>
<table border="1">
<tr bgcolor="#fffff">
<td width="50" height="31"><?php echo $row->title;?></td>
<td width="433" height="31"><?php echo $row->content;?></td>
</tr>
</table>
<?php
}while ($row=mysql_fetch_object($sql));
mysql_free_result($sql);     //关闭记录集
mysql_close($conn);      // 关闭数据库连接
?>
　　2.insert语句添加信息
add_affiche.php页面的代码
<form name="form1" method="post" action="check_add_affiche.php">
<table width="520" height="212" border="0" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF">
<tr>
<td width="87" align="center">公告主题：</td>
<td width="433" height="31">
<input name="txt_title" type="text" id="txt_title" size="40">*
</td>
</tr>
<tr>
<td width="124" align="center">公告内容：</td>
<td>
<textarea name="txt_content" cols="50" rows="8" id="txt_content"></textarea>
</td>
</tr>
<tr>
<td height="40" colspan="2" align="center">
<input name="Submit" type="submit" class="btn_grey" value="保存" onclick="return check(form)">
<input name="Submit2" type="reset" value="重置">
</td>
</tr>
</table>
</form>
<script type="text/javascript">
function check(form){
if(form.txt_title.value==""){
alert("请输入公告标题！");
form.txt_title.focus();
return false;
}
if(form.txt_content.value==""){
alert("请输入公告内容！");
form.txt_content.focus();
return false;
}
form.submit();
}
</script>
check_add_affiche.php页面代码
<?php
$conn=mysql_connect("localhost"，"root"，"root")or die("数据库连接错误".mysql_error());
mysql_select_db("testphp"，$conn)or die("数据库访问错误".mysql_error());
mysql_query("set names 'utf8'");
$title=$_POST[txt_title];
$content=$_POST[txt_content];
$createtime=date("Y-m-d H:i:s");
$sql=mysql_query("insert into tb_affiche(title，content，createtime)values('$title'，'$content'，'$createtime')");
echo "<script>alert('公告信息添加成功！');window.location.href='add_affiche.php';</script>";
mysql_free_result($sql);
mysql_close($conn);
?>
　　3.update语句修改信息
<?php
$conn=mysql_connect("localhost"，"root"，"root")or die("数据库连接错误".mysql_error());
mysql_select_db("testphp"，$conn)or die("数据库访问错误".mysql_error());
mysql_query("set names 'utf8'");
$title=$_POST[txt_title];
$content=$_POST[txt_content];
$id=$_POST[id];
$sql=mysql_query("update tb_affiche set title='$title'，content='$content'where id=$id");
if($sql){
echo "<script>alert('公告信息编辑成功！');history，back();window.location.href='modify.php?id=$id';</script>";
}
else{
echo "<script>alert('公告信息编辑失败！');history，back();window.location.href='modify.php?id=$id';</script>";
}
mysql_free_result($sql);
mysql_close($conn);
?>
　　4.delete语句删除信息
<?php
$conn=mysql_connect("localhost"，"root"，"root")or die("数据库连接错误".mysql_error());
mysql_select_db("testphp"，$conn)or die("数据库访问错误".mysql_error());
mysql_query("set names 'utf8'");
$id=$_POST[id];
$sql=mysql_query("delete from tb_addiche where id=$id");
if($sql){
echo "<script>alert('公告信息删除成功！');history，back();window.location.href='delete_affiche.php?id=$id';</script>";
}
else{
echo "<script>alert('公告信息删除失败！');history，back();window.location.href='delete_affiche.php?id=$id';</script>";
}
mysql_free_result($sql);
mysql_close($conn);
?>