这个错误的原因来自于没有安装一个依赖库: 官方文档说明如下: Modifying Columns Prerequisites Before modifying a column, be sure to add the doctrine/dbal dependency to your composer.json file. The Doctrine DBAL library is used to determine the current state of the column and creat…
按照以前的老方法,写Java的主程序通过JDBC来连MySQL. //1: import java.sql.*; import java.sql.*; public class JDBC_Driver { // JDBC driver name and database URL; static final String dbDriver = "com.mysql.jdbc.Driver"; static final String DB_URL = "jdbc:mysql://…
解决 Laravel/Lumen 出现 "Please provide a valid cache path" 问题 解决 Laravel/Lumen 出现 "Please provide a valid cache path" 问题 新建项目报错: //错误提示: InvalidArgumentException in Compiler.php line 36: Please provide a valid cache path. 错误提示的出错: // vend…
Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary. 这个问题是升级完MySQL的链接驱动后出现的问…
在Eclipse中使用MySQL遇到了点小问题 如果对Eclipse中配置MySql还有疑问的可以参考一下这篇博客:https://blog.csdn.net/qq_38247544/article/details/80419692 参考菜鸟上的例子的代码如下: 当然,这是修改后没问题后的代码 package mysqltest; import java.sql.*; public class Mysql { // jdbc驱动名以及数据库URL // static final String J…
laravel 5.3 以后默认开启 mysql严格模式(strict)在mysql在严格模式下, 并且开启了ONLY_FULL_GROUP_BY的情况下,group by 的字段没有出现在 select 的语句中会报错.关闭了严格模式就不会报错. 如下Demo public static function orders($phase) { return self::select(DB::raw("SUM(orders) as orders"),"type",&qu…
百度之后得到解决,再此做个笔记 错误提示 Kernel driver not installed (rc=-1908) The VirtualBox Linux kernel driver (vboxdrv) is either not loaded or there is a permission problem with /dev/vboxdrv. Please reinstall the kernel module by executing '/etc/init.d/vboxdrv set…
在 laravel 中使用 QQ 发送邮件的时候莫名其妙的出现了如下错误:Connection could not be established with host smtp.exmail.qq.com [php_network_getaddresses: getaddrinfo failed: Name or service not known #0]in StreamBuffer.php line 270 顺藤摸瓜找到 vendor/swiftmailer/swiftmailer/lib…
这个错误是由于WudfPf这个服务没有启动有关,导致开机时出现SVCHOST.EXE出现,内存不能"Written"的错误, http://answers.yahoo.com/question/index?qid=20110614111435AATsgp9 Run these commands one by one in 'command prompt' sc config wudfpf start= auto net start wudfpf net start wudfsvc…
一.背景 最近在家里捣鼓一个公司自己搭建的demo的时候,发现程序一启动就会出现CommunicationsException: Communications link failure错误,经过一番排查最后发现是数据库url写错造成的,这个过程中也对出现这个错误的解决思路有了一些自己的理解,现和大家分享.该错误的具体信息如下: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure…
