PHP操作MySQL数据库，实现查询数据并输出到web页面

推荐：mysql视频教程 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_cl

推荐：mysql视频教程

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>';
}?>

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