php 事务， mysqli_fetch_all(),mysql 一张表的多个字段关联另外一张表

<?php
$dbhost = 'localhost:3306';  // mysql服务器主机地址
$dbname = 'test';
$dbuser = 'root';            // mysql用户名
$dbpass = 'root';          // mysql用户名密码
$conn = mysqli_connect($dbhost, $dbuser, $dbpass,$dbname);
if(! $conn )
{
    die('连接失败: ' . mysqli_error($conn));
}
// 设置编码，防止中文乱码
mysqli_query($conn, "set names utf8");
mysqli_select_db( $conn, 'RUNOOB' );
mysqli_query($conn, "SET AUTOCOMMIT=0"); // 设置为不自动提交，因为MYSQL默认立即执行
mysqli_begin_transaction($conn);            // 开始事务定义
 
if(!mysqli_query($conn, "insert into callback (name) values(8)") || !mysqli_query($conn, "insert into callback (id) values(9)"))
{    
    mysqli_query($conn, "ROLLBACK");     // 判断当执行失败时回滚
}
 
/*if()
{    
    mysqli_query($conn, "ROLLBACK");      // 判断执行失败时回滚
}*/
mysqli_commit($conn);            //执行事务
mysqli_close($conn);
?>

 

mysqli_fetch_all()

<?php  
// 假定数据库用户名：root，密码：123456，数据库：RUNOOB  
$con=mysqli_connect("localhost","root","123456","RUNOOB");  
if (mysqli_connect_errno($con))  
{  
    echo "连接 MySQL 失败: " . mysqli_connect_error();  
}  

$sql="SELECT name,url FROM websites ORDER BY alexa"; 
$result=mysqli_query($con,$sql); 

// 获取数据 
mysqli_fetch_all($result,MYSQLI_ASSOC); 

// 释放结果集 
mysqli_free_result($result); 

mysqli_close($con); 
?>

定义和用法

mysqli_fetch_all() 函数从结果集中取得所有行作为关联数组，或数字数组，或二者兼有。

注释：该函数只在带有 MySQL Native Driver 时可用。

mysqli_fetch_all($result,MYSQLI_ASSOC);//获取所有数据的关联数组

 转自：https://www.cnblogs.com/furuihua/p/11190191.html

mysql 一张表的多个字段关联另外一张表:

SELECT
vtiger_orderitem.orderid,
    (
        SELECT
            vtiger_users.last_name
        FROM
            vtiger_users
        WHERE
            vtiger_orderitem.signatory = vtiger_users.id
    ) AS signatory,
    (
        SELECT
            vtiger_users.last_name
        FROM
            vtiger_users
        WHERE
            vtiger_orderitem.servicer = vtiger_users.id
    ) AS servicer
FROM
    vtiger_orderitem
 





SELECT
    n.orderid,
    m.last_name,
    q.last_name
FROM
    vtiger_orderitem n
LEFT JOIN vtiger_users m ON n.signatory = m.id 
LEFT JOIN vtiger_users q ON n.servicer = q.id

转自：https://www.cnblogs.com/anxiaoyu/p/8951797.html