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外匯交易平台MT4的使用

05-20 1万+

php多线程pthreads的安装与使用

Stackables are tasks that are executed 外匯交易平台MT4的使用 by Worker threads. You can synchronize with, read, and write Stackable objects before, after and during their execution.

四、 互斥锁

多线程与共享内存

五、 线程同步

有些场景我们不希望 thread->start() 就开始运行程序,而是希望线程等待我们的命令。$thread->wait();测作用是 thread->start()后线程并不会立即运行,只有收到 $thread->notify(); 发出的信号后才运行

动态队列线程池

pthreads Pool类

七、多线程文件安全读写

LOCK_NB 如果不希望 flock() 在锁定时堵塞

八、多线程与数据连接

pthreads 与 pdo 同时使用是,需要注意一点,需要静态声明public static $dbh;并且通过单例模式访问数据库连接。

Worker 与 PDO

Pool 与 PDO

进一步改进上面程序,我们使用单例模式 $this->worker->getInstance(); 全局仅仅做一次数据库连接,线程使用共享的数据库连接

【C/C++】Sleep函数的用法

皓皓松 于 2016-06-08 20:22:35 发布 191319 收藏 246

Linux 下为 --> unistd.h

Sleep函数功能: 执行挂起一段时间,也就是等待一段时间在继续执行用法:Sleep(时间)头文件:Windows下为--> windows.h Linux 下为 --> unistd.h注意:(1)Sleep是区分大小写的,有的编译器是大写,有的是小写。 (2)Sleep括号里的时间,在windows下是已毫秒为单位,而Linux是以秒为单位#includ

06-11 2万+

07-27 2275

有时我们使用for循环去产生随机数组时,发现其生成随机数都一样,这和我们想要不一样。通过查阅相关资料后发现,是因为当计算机性能较快时,for循环运行时间非常短,srand(time(NULL))每次都返回相同值。 原因:用系统时间做随机种子并不保险,如果应用程序在一个较快计算机上运行,则该计算机系统时钟可能没有时间在此构造函数调用之间进行更改,Random 不同实例种子值。 解决方法一:使用Random ra=new Random(); 解决方法二:使用Sleep()函数..

05-20 1万+

Mysql查询语句binary的用法_MySQL中使用binary查询字符串 · Fitzix

weixin_39844284 于 2021-01-20 01:24:19 发布 1250 收藏 1

2ff34e647e2e3cdfd8dca593e17d9b0a.png

今天,在做老师布置的实验作业时候遇到一个关于MySQL字符串比较问题。场景是这样的,就是需要在数据库中查询记录而进行字符串比较时,需要对字符串进行大小写区分比较,这样在默认情况下进行操作可能不会达到你想要的效果。比如下面实例:SELECT * FROM user where username='maratrix';

SELECT * FROM user where username='MARATRIX';

答:使用BINARY操作符。BINARY操作符将后面的字符串抛给一个二进制字符串。这是一种简单的方式来促使逐字节而不是逐字符的进行列比较。这使得比较区分大小写,即使该列不被定义为 BINARY或 BLOB。BINARY影响整个比较;它可以在任何操作数前被给定,而产生相同的结果。

1、第一种是在创建表结构时候使用binary属性来定义字段:create table if not exists user(

id int unsigned primary key auto_increment,

name varchar(32) binary,

或者在表结构创建好后使用alter来添加字段binary属性alter table user modify name varchar(32) binary ;

2、第二种方法是在sql语句中使用bianry来进行区分大小写操作:SELECT * FROM user where name=binary 'maratrix';

SELECT * FROM user where binary name='maratrix';

进过测试发现,使用SELECT * FROM user where name=binary 'maratrix';效率更高点,原因是将binary放在字符串前会使用索引(假设该字段存在索引),而将binary放在字段前面将不会使用索引,即使索引存在也不会使用。

在一些语境中,假如你将一个编入索引的列派给BINARY, MySQL 将不能有效使用这个索引。

今天,在做老师布置的实验作业时候遇到一个关于MySQL字符串比较问题。场景是这样的,就是需要在数据库中查询记录而进行字符串比较时,需要对字符串进行大小写区分比较,这样在默认情况下进行操作可能不会达到你想要的效果。比如下面实例:SELECT * FROM 外匯交易平台MT4的使用 user where username='maratrix';SELECT * FROM user where username='MARATRI.

在需要用SqlHelper类项目添加对System.Configuration应用,有什么不足地方希望大家能够给我指出来,我也好做一下修改什么。 需要说明是ExecuteList和ExecuteObject是泛型方法,调用时除了需要传必须参数外还需要给方法传入一个类型,下面做一个例子 数据库有一张表,表结构如下 Users ---- 表名 ID ---- 用户ID Name ---- 用户名 Pwd ---- 用户密码 表数据如下 ID Name Pwd 1 张三 zhangsan 2 李四 lisi 1 张三 lisi 项目内有一个实体类 User ---- 类名 ID ---- 属性 ---- int类型 Name ---- 属性 ---- string类型 Pwd ---- 属性 ---- string类型 现在需要查询Users表里面所有数据,具体实现代码如下 SqlHelper helper = new SqlHelper("data source=.;database=test;uid=sa;pwd=sa"); //这句代码即可实现查询Users表内所有内容 List list = helper.ExecuteList("select * from users"); //查询ID=1用户 User user = helper.ExecuteObject("select * from users where object> ps = new Dictionary(); ps.Add("name","张三"); User user = helper.ExecuteObject("select * from users where name = @name", ps); 本辅助类没有对表存在判断方法。。

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