错误信息:Cannot drop index 'energy_type_id': needed in a foreign key constraint 创建device表的信息 CREATE TABLE `device` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` char(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, `device_type_id` int(16) NOT N
mysql安装参考教程:https://blog.csdn.net/qq_37350706/article/details/81707862 安装完毕后 执行sql语句 SELECT * FROM court_info GROUP BY second_court_name HAVING COUNT(second_court_name) > 1 报错 [Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause an
django2.0+连接mysql数据库迁移时候报错 情况一 错误信息 django.core.exceptions.ImproperlyConfigured: mysqlclient 1.3.13 or newer is required; you have 0.9.3. 解决办法 去到\python\lib\site-packages\django\db\backends\mysql\base.py" 把里面的注释掉 # if version < (1, 3, 13): # raise
我的服务器买的是阿里云ECS linux系统.为了更好的操作数据库,我希望可以用navicat for mysql管理我的数据库. 当我按照正常的模式去链接mysql的时候, 报错提示: - Can't connect MySQL Server on 'x.x.x.x'(10038) 于是,通过查找资料,我找到了解决的方法,其实是阿里云服务器为了安全默认不允许从外面链接Mysql数据库. 下面是解决整理的三种解决的方法: 第一种.监听地址配置错误解决方法: 检查mysql服务端口(默认为3306
MySQL 设置root密码报错:mysqladmin: connect to server at 'localhost' failed 1.安装完MySQL设置root密码报错如下 [root@vm172--- data]# mysqladmin -uroot password "linux@123" mysqladmin: connect to server at 'localhost' failed error: 'Access denied for user 'root'@'l
C++ delete报错 今天写了如下代码 #include <iostream> #include <algorithm> using namespace std; int main() { int n, s, a, b; int ans = 0; cin >> n >> s; cin >> a >> b; int* p = new int[n]; int temp; int length = 0; for (int i = 0;
Tomcat7.0启动报错:java.lang.illegalargumentexception:taglib definition not consisten with specification version 原因:Tomcat7和Tomcat6在标签配置上稍有不同. 解决: You just need to confirm the allowed tags by web.xml confirming DTD file. e.g. version=”2.5″ compatible web.
把Androidstudio2.2的项目放到3.0里面去了,然后开始报错了. 体验最新版AndroidStudio3.0 Canary 8的时候,发现之前项目的butter knife报错,用到注解的应该都会报错 Error:Execution failed for task ':app:javaPreCompileDebug'. > Annotation processors must be explicitly declared now. The following dependencies
在使用Navicat for MySQl访问远程mysql数据库,出现报错,显示“1130 - Host'xxx.xxx.xxx.xxx' is not allowed to connect to this MySQL server“.解决办法如下: GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root' WITH GRANT OPTION 把他运行一下就行了.
-- ==================================================================== -- mysqladmin: connect to server at 'localhost' failed的解决方案! -- ==================================================================== 1 登陆失败,mysqladmin修改密码失败 [root@mysql var]# m
九月 08, 2017 10:18:19 上午 org.apache.tomcat.util.digester.SetPropertiesRule begin 警告: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:war_item' did not find a matching property. 九月 08, 20
首次安装hive-2.1.0,通过bin/hive登录hive shell命令行,报错如下: [hadoop@db03 hive-2.1.0]$ bin/hive which: no hbase in (/opt/service/jdk1.7.0_67/bin:/opt/service/jdk1.7.0_67/jre/bin:/opt/mysql-5.6.24/bin:/opt/service/jdk1.7.0_67/bin:/opt/service/jdk1.7.0_67/jre/bin:/u