php->msql 多条件查询

body>
<br />
<form action="duotiaojian.php" method="post">
<div>姓名:
<input type="text" name="xm" /> 
民族代号：
<input type="text" name="mz" />
<input type="submit" value="查询" />
</div>
</form>
<br />
<table width="100%" border="1" cellpadding="0" cellspacing="0">
    <tr>
        <td>代号</td>
        <td>姓名</td>
        <td>性别</td>
        <td>民族</td>
        <td>生日</td>
        <td>操作</td>
    </tr>
    
    <?php
    
    //先判断有没有提交值
    $xxm = "";
    $tj = " 1=1 ";
    $tj2 = " 1=1 ";
    if(!empty($_POST["xm"]) && $_POST["xm"]!="")
    {
        $xxm = $_POST["xm"];
        $tj = " name like ‘%{$xxm}%‘ ";
    }
    
    if(!empty($_POST["mz"]) && $_POST["mz"]!="")
    {
        $mz = $_POST["mz"];
        $tj2 = " nation=‘{$mz}‘ ";
    }
    
    
    
    //造连接对象
    $db = new  MySQLi("localhost","root","123","mydb");
    //写SQL语句
    $sql = "select * from info where ".$tj." and ".$tj2;
    echo $sql;
    //执行SQL语句
    $result = $db->query($sql);
    //读数据
    $attr = $result->fetch_all();
    
    foreach($attr as $v)
    {
        echo "<tr>";
        
        $sex = $v[2]?"男":"女";
        
        //根据名族代号查询名族名称
        $name = NationName($v[3]);
        
        //替换关键字
        $newname = str_replace($xxm,"<mark>{$xxm}</mark>",$v[1]);
        
        echo "<td>{$v[0]}</td><td>{$newname}</td><td>{$sex}</td><td>{$name}</td><td>{$v[4]}</td><td><a href=‘shanchu.php?c={$v[0]}‘ onclick=\"return confirm(‘确定删除么？‘)\">删除</a><a href=‘xiugai.php?c={$v[0]}‘>修改</a></td>";
        
        /*foreach($v as $v1)
        {
            echo "<td>{$v1}</td>";
        }*/
        
        echo "</tr>";
    }
    
    //给一个民族代号，返回民族名称
    function NationName($code)
    {
        //造连接对象
        $db = new  MySQLi("localhost","root","123","mydb");
        //写SQL语句
        $sql = "select name from nation where code=‘{$code}‘";
        //执行SQL语句
        $result = $db->query($sql);
        
        $attr = $result->fetch_row();
        
        return $attr[0];
    }
    
    ?>
    
    
</table>
<a href="add.php"><input type="button" value="添加数据" /></a>



</body>
</html>