数据库基本操作

Posted 2021-01-03 chenlw

对于含有中文的数据插入，需要添加 

mysqli_query($conn , "set names utf8");

插入数据：

INSERT INTO table_name  (field1, field2,...fieldN)  VALUES  (valueA1,valueA2,...valueAN),(valueB1,valueB2,...valueBN),(valueC1,valueC2,...valueCN)......;

查询数据：

$sql = ‘SELECT runoob_id, runoob_title, 
        runoob_author, submission_date
        FROM runoob_tbl‘;
$retval = mysqli_query( $conn, $sql );//获取数据
if(! $retval )
{
    die(‘无法读取数据: ‘ . mysqli_error($conn));
}
while($row = mysqli_fetch_array($retval, MYSQLI_ASSOC))//使用或输出所有查询的数据
{
    echo "<tr><td> {$row[‘runoob_id‘]}</td> ".
         "<td>{$row[‘runoob_title‘]} </td> ".
         "<td>{$row[‘runoob_author‘]} </td> ".
         "<td>{$row[‘submission_date‘]} </td> ".
         "</tr>";
}

更新数据：

$sql = ‘UPDATE runoob_tbl
        SET runoob_title="学习 Python"
        WHERE runoob_id=3‘;

删除数据：

$sql = ‘DELETE FROM runoob_tbl
        WHERE runoob_id=3‘;