PHP operates the MySQL database to query data and output it to the web page

Related free learning recommendations: mysql video tutorial

There is a data table hacker in the database, now we need to query the data in the hacker table And displayed on the page, the code is as follows:

':print "no!
";

    $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！
';
    }else{
        echo '创建hacker表失败！'.$mysqli->error.'
';
    }

    // 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。
";
    // }else{
    //     echo '添加失败。'.$mysqli->error."
";
    // }

    $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。
";
    }else{
        echo '添加失败。'.$mysqli->error."
";
    }
    $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。
";
    }else{
        echo '添加失败。'.$mysqli->error."
";
    }
    $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。
";
    }else{
        echo '添加失败。'.$mysqli->error."
";
    }

    // 数据查询
    $sql = $mysqli->query("select * from hacker");
    if($sql){
        // echo '有数据！
';
        $rows = $sql->num_rows;
        echo '查询结果共有'.$rows.'条记录
';
        echo "
        ";

        if($rows){
            while($row = $sql->fetch_assoc()){
                // echo 'id = '.$row['id'].'
name = '.$row['name'].'
chinese = '.$row['chinese'].'
math = '.$row['math'].'
english = '.$row['english'].'
';
                echo "
                ";
            }
            echo "

                

                    
序号
                    
姓名
                    
语文
                    
数学
                    
英语
                

                            
".$row['id']."
                            
".$row['name']."
                            
".$row['chinese']."
                            
".$row['math']."
                            
".$row['english']."
                    
";
        }else{
            echo '没有您要找的数据。
';
        }
    }else{
        echo 'MySQL语句有误。
'.$mysqli->error.'
';
    }?>

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