PHP操作MySQL数据库，实现查询数据并输出到web页面

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数据库中有数据表hacker，现在我们要将hacker表中的数据查询出来并在页面上显示，代码如下：

<?PHP
    // 连接数据库
    $MysqLi = MysqLi_connect(localhost,root,123,'student');     //MysqLi_close($con);
    $MysqLi ? print 'yes!<br>':print no!<br>;

    $sql = $MysqLi -> query('use student');
    $sql = $MysqLi -> query('set name utf8');

    // 创建数据表
    $sql = $MysqLi -> query(create table hacker(
        id char(6) not null,
        name char(8) not null,
        chinese float not null,
        math float not null,
        english float not null
    ));
    if($sql == true){
        echo '成功创建hacker表！<br>';
    }else{
        echo '创建hacker表失败！'.$MysqLi->error.'<br>';
    }

    // 添加数据——hacker
    // $sql  = insert into hacker values('1','张三','10','20','30');; 
    // $sql  .= insert into hacker values('2','李四','66','77','88');; 
    // $sql .= insert into hacker values('3','王二','55','44','33');; 
    // $sql .= insert into hacker values('4','麻子','22','55','77'); 
    // $rows = $MysqLi->affected_rows;
    // if($rows == 3){
    //     echo 添加数据成功。<br>;
    // }else{
    //     echo '添加失败。'.$MysqLi->error.<br>;
    // }

    $sql = $MysqLi -> query(insert into hacker
        values('2','李四','66','77','88')
    );
    $rows = $MysqLi->affected_rows;
    if($rows == 1){
        echo 添加数据成功。<br>;
    }else{
        echo '添加失败。'.$MysqLi->error.<br>;
    }
    $sql = $MysqLi -> query(insert into hacker
        values('3','王二','55','44','33')
    );
    $rows = $MysqLi->affected_rows;
    if($rows == 1){
        echo 添加数据成功。<br>;
    }else{
        echo '添加失败。'.$MysqLi->error.<br>;
    }
    $sql = $MysqLi -> query(insert into hacker
        values('4','麻子','22','55','77')
    );
    $rows = $MysqLi->affected_rows;
    if($rows == 1){
        echo 添加数据成功。<br>;
    }else{
        echo '添加失败。'.$MysqLi->error.<br>;
    }

    // 数据查询
    $sql = $MysqLi->query(select * from hacker);
    if($sql){
        // echo '有数据！<br>';
        $rows = $sql->num_rows;
        echo '查询结果共有'.$rows.'条记录<br>';
        echo <table>
                <tr>
                    <th>序号</th>
                    <th>姓名</th>
                    <th>语文</th>
                    <th>数学</th>
                    <th>英语</th>
                <tr>
        ;

        if($rows){
            while($row = $sql->fetch_assoc()){
                // echo 'id = '.$row['id'].'<br>name = '.$row['name'].'<br>chinese = '.$row['chinese'].'<br>math = '.$row['math'].'<br>english = '.$row['english'].'<br>';
                echo <tr>
                            <td>.$row['id'].</td>
                            <td>.$row['name'].</td>
                            <td>.$row['chinese'].</td>
                            <td>.$row['math'].</td>
                            <td>.$row['english'].</td>
                    </tr>
                ;
            }
            echo </table>;
        }else{
            echo '没有您要找的数据。<br>';
        }
    }else{
        echo 'MysqL语句有误。<br>'.$MysqLi->error.'<br>';
    }?>

原文地址：https://www.jb51.cc/mysql/1208719.html