FredGrit

摘要： 1.Install libpq-dev sudo apt install libpq-dev locate libpq-fe.h /usr/include/postgresql/libpq-fe.h 2.create table t1 create table t1(id bigserial not 阅读全文

摘要： 1.Install libpq-dev sudo apt install libpq-dev locate libpq-fe.h /usr/include/postgresql/libpq-fe.h 2.main.cpp #include <chrono> #include <fstream> #i 阅读全文

摘要： //create table t1 CREATE TABLE `t1` (`id` bigint NOT NULL AUTO_INCREMENT,`author` varchar(40) NOT NULL,`comment` varchar(40) NOT NULL,`content` varcha 阅读全文

摘要： //create table t1; create table t1(id bigserial not null primary key,author varchar(40) not null,comment varchar(40) not null,content varchar(40) not 阅读全文

摘要： alter table table_name alter column column_name new_type CREATE TABLE public.t2 ( id serial primary key, name character varying(40) NOT NULL, author c 阅读全文

摘要： //settings.json { "configurations": [ { "name": "Linux", "includePath": [ "${workspaceFolder}/**", "/usr/include/c++/13", "/usr/include/x86_64-linux-g 阅读全文

摘要： sudo apt update; sudo apt upgrade; sudo apt install postgresql postgresql-contrib; sudo systemctl start postgresql.service https://www.digitalocean.co 阅读全文

摘要： cannot open source file "stddef.h" (dependency of "chrono"). Please run the 'Select IntelliSense Configuration...' command to locate your system heade 阅读全文

摘要： #include <iostream> void ignore_exceptions() { for(int i=-10;i<10;i++) { std::cout<<"i:"<<i<<", 100/i="<<100/i<<std::endl; } std::cout<<"Finished in " 阅读全文

摘要： sudo apt install libmysqlcppconn-dev #include <algorithm> #include <atomic> #include <barrier> #include <bitset> #include <chrono> #include <ctime> #i 阅读全文