常用代码片段

Java

mybatis

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

// dataSource 数据源
SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
sqlSessionFactoryBean.setDataSource(dataSource);
PathMatchingResourcePatternResolver resourceLoader = new PathMatchingResourcePatternResolver();
// 加载 sql xml
sqlSessionFactoryBean.setMapperLocations(resourceLoader.getResources("classpath:mysql/*.xml"));
// 加载 mybatis 配置文件
sqlSessionFactoryBean.setConfigLocation(resourceLoader.getResource("mybatis-config.xml"));
SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBean.getObject();
SqlSession session = sqlSessionFactory.openSession();
// 获取接口对象
DemoDao demoDao = session.getMapper(DemoDao.class);
demoDao.doQuery();
session.close();

C/C++

Hello World

#include <stdio.h>

int main() {
    printf("Hello, World!\n");
    return 0;
}

#include <iostream>

int main() {
    std::cout << "Hello, World!" << std::endl;
    return 0;
}

# 编译c程序 , yum install gcc
gcc main.c -o main.o
# 编译c++程序 , yum install gcc-c++
g++ main.cpp -o main