mybatis 获取 sqlSession

代码

package com.wt.utils;



import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

public class MyBatisUtil {
    // 变量提升
    private static SqlSessionFactory sqlSessionFactory;

    // 1、构建 SqlSessionFactory
    static  {
        try {
            String resource = "mybatis-config.xml";
            InputStream inputStream;
            inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    // 2、从 SqlSessionFactory 中获取 SqlSession
    public static SqlSession getSession(){
        SqlSession getSession = sqlSessionFactory.openSession();
        return getSession;
    }
}

注意：
sqlSessionFactory.openSession()
有overload方法， openSession(boolean var1)
boolean 为 true， 就不需要
执行commit()

其它

#{} 和 ${} 的区别
#{}更安全(sql语句注入)