orm

MyBatis学习笔记二：增删改查

由 老子叫甜甜 提交于 2020-12-22 05:03:13
MyBatis基本的增删改查操作，有图有真相，项目截图[ MyBatis-0200 ] 项目依赖及表参阅 上一篇 [user.xml] <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <!-- 命名空间：通常是Mapper接口的完整类路径，在MyBatis3.x中不可省略 --> <mapper namespace="net.yeah.likun_zhang.mapper.IUserMapper"> <!-- ======================================== eviction ： 回收方式( LRU – 最近最少使用的:移除最长时间不被使用的对象(默认)。 FIFO – 先进先出:按对象进入缓存的顺序来移除它们。 SOFT – 软引用:移除基于垃圾回收器状态和软引用规则的对象。 WEAK – 弱引用:更积极地移除基于垃圾收集器状态和弱引用规则的对象。 ) flushInterval ： 可以被设置为任意的正整数,而且它们代表一个合理的毫秒 形式的时间段。默认情况是不设置,也就是没有刷新间隔

.NET ORM Framework with data versioning (Slowly Changing Dimension Type 2)?

由 你。 提交于 2020-12-14 23:52:06
问题 I am building a .NET application for inserting data (an Excel add-in in fact), and I want to use an ORM for inserting data with automated versioning . Here's a worked example: User "John Doe" does the first data insertion (4 data points as per below example) At a later time, user "Albert" opens the interface, modifies one data point, and saves All 4 data points are processed; ORM flags the modified data as non-Current, adds the new data, updates version counter, changes validity dates columns

.NET ORM Framework with data versioning (Slowly Changing Dimension Type 2)?

由 谁说我不能喝 提交于 2020-12-14 23:46:04
问题 I am building a .NET application for inserting data (an Excel add-in in fact), and I want to use an ORM for inserting data with automated versioning . Here's a worked example: User "John Doe" does the first data insertion (4 data points as per below example) At a later time, user "Albert" opens the interface, modifies one data point, and saves All 4 data points are processed; ORM flags the modified data as non-Current, adds the new data, updates version counter, changes validity dates columns

.NET ORM Framework with data versioning (Slowly Changing Dimension Type 2)?

由 非 Y 不嫁゛ 提交于 2020-12-14 23:45:10
问题 I am building a .NET application for inserting data (an Excel add-in in fact), and I want to use an ORM for inserting data with automated versioning . Here's a worked example: User "John Doe" does the first data insertion (4 data points as per below example) At a later time, user "Albert" opens the interface, modifies one data point, and saves All 4 data points are processed; ORM flags the modified data as non-Current, adds the new data, updates version counter, changes validity dates columns

.NET ORM Framework with data versioning (Slowly Changing Dimension Type 2)?

由 六月ゝ 毕业季﹏ 提交于 2020-12-14 23:42:42
问题 I am building a .NET application for inserting data (an Excel add-in in fact), and I want to use an ORM for inserting data with automated versioning . Here's a worked example: User "John Doe" does the first data insertion (4 data points as per below example) At a later time, user "Albert" opens the interface, modifies one data point, and saves All 4 data points are processed; ORM flags the modified data as non-Current, adds the new data, updates version counter, changes validity dates columns

Django group by hour/day

由 那年仲夏 提交于 2020-12-11 06:01:15
问题 I have a model: Model.py class DispatchPlan(models.Model): total_trucks = models.IntegerField(default=0) material_type = models.CharField(max_length=255, default=0, choices=mtypes) scheduled_date = models.DateTimeField(max_length=255, default=0) offered_price = models.IntegerField(default=0) weight = models.IntegerField(default=0) and I am trying to plot a graph between scheduled_date and weight. I want to group the timestamp by hour and weight accordingly. How can I do that? In SQl its just

How to INSERT using a SELECT in Hibernate

由 丶灬走出姿态 提交于 2020-12-08 08:47:18
问题 I need to implement the following request in hibernate: insert into my_table(....,max_column) values(...,(select max(id) from special_table where ....)) How to do that in hibernate, using annotations? special_table may be not a child or dependency of my_table, just a subselect. 回答1: You can use the INSERT INTO ... SELECT ... feature: int updateCount = session.createQuery(""" insert into MyEntity( ..., max_column ) select ..., max(id) from SpecialEntity """) .executeUpdate(); 来源： https:/

How to INSERT using a SELECT in Hibernate

由 ぐ巨炮叔叔 提交于 2020-12-08 08:46:52
问题 I need to implement the following request in hibernate: insert into my_table(....,max_column) values(...,(select max(id) from special_table where ....)) How to do that in hibernate, using annotations? special_table may be not a child or dependency of my_table, just a subselect. 回答1: You can use the INSERT INTO ... SELECT ... feature: int updateCount = session.createQuery(""" insert into MyEntity( ..., max_column ) select ..., max(id) from SpecialEntity """) .executeUpdate(); 来源： https:/

Does TypeORM supports raw SQL queries for input and output?

由 偶尔善良 提交于 2020-12-08 05:23:46
问题 I would like to know if there is a feature of TypeORM that supports raw sql queries for Insert Update Delete Select etc.. 回答1: According to this issue comment, TypeORM enables you to use any queries to your heart's content. using entityManager.query() Here is the documentation. UPDATE Link above is outdated, try this instead entity-manager-api. const rawData = await manager.query(`SELECT * FROM USERS`); 回答2: 2020 UPDATE, entityManager.query() basing the entityManager off the EntityManager

Does TypeORM supports raw SQL queries for input and output?

由 爱⌒轻易说出口 提交于 2020-12-08 05:22:14
问题 I would like to know if there is a feature of TypeORM that supports raw sql queries for Insert Update Delete Select etc.. 回答1: According to this issue comment, TypeORM enables you to use any queries to your heart's content. using entityManager.query() Here is the documentation. UPDATE Link above is outdated, try this instead entity-manager-api. const rawData = await manager.query(`SELECT * FROM USERS`); 回答2: 2020 UPDATE, entityManager.query() basing the entityManager off the EntityManager
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