Serialized objects in C++ and stored in mysql

1. Serialization There are many ways to serialize C++. I recommend boost here. A simple tutorial. The boost method is to add a friend class object to the class definition and implement the serialize() method to make the class serialized. To use boost serialization, you first need to download the boost file from the boost official website, an ...

Posted on Fri, 05 Jul 2019 16:56:39 -0700 by pjoshi

Create multiple triggers by adding oracle primary key

Questions: Recently, the sql script of the project has been revised and several tables have been added. Three tables need attribute self-increment. AUTO_INCREMENT can be used directly in mySql. oracle has no self-increment function. It needs to write trigger manually to realize self-increment function. Solutions have been found online. Posted ...

Posted on Fri, 05 Jul 2019 13:26:53 -0700 by brynjar

Queries on MongoDB Dry Stores

Queries on MongoDB Dry Stores Dead work Before we start, we should prepare the data for demonstration. Here are some data I inserted. The data are as follows: db.user.insertMany( [{ name:'jack', age:22, sex:'Man', tags:['python','c++','c'], grades:[22,33,44,55], school:{ name:'shida', city:'xuzhou' } ...

Posted on Thu, 04 Jul 2019 17:50:44 -0700 by brianlange

Expression expression tree dynamic query

In the query of data list, we usually use two ways to query: linq query Database sql statement query This way, of course, can achieve the query, I have done so before, because the query conditions are very few. With linq, the attributes of all query conditions can be transferred to the background, and then queried by where according to whethe ...

Posted on Wed, 03 Jul 2019 18:18:34 -0700 by joe1986

Timely Email Warning and Reminder for Blockage in Database (Part 2)

stay Timely Email Warning and Reminding of Blocking in Database (Part I) We build a new table to store blocked records, collect blocked stored procedures and configure sending mail to test ok, etc. Step 4: Create a storage process for sending mail. There are two modes that you can choose according to your needs Create a stored procedure for sen ...

Posted on Wed, 03 Jul 2019 15:53:38 -0700 by ksb24930

SQL Server Transaction Replication Distribution to Subscription Synchronization Slow

Recently, it was found that a release often had problems, and every few days it was out of sync, prompting for initialization. When synchronization is readjusted, replication is still slow! Every day, there are 56 million orders that are not distributed during the day! To solve the problem of slow synchronization, we need to know what operation ...

Posted on Wed, 03 Jul 2019 14:55:25 -0700 by lalomarquez

DML for MySQL operations

Catalog Classification of SQL statements DML statement Classification of SQL statements DDL (Data Definition Languages) statement: Data Definition Language.These statements define different data segments, Definition of database objects such as databases, tables, columns, indexes, etc.Common statement ke ...

Posted on Mon, 01 Jul 2019 09:52:57 -0700 by iceblox

Implementation of Oracle Compatibility Function through orafunc in Green Plum Cluster

oracle data migration to Greenplum has a difficult problem, that is, many stored procedures called storage functions, one by one is too troublesome to change, so if you want to migrate smoothly, one way to compare is to implement functions with the same name and function in greenplum. 1. See if the orafunc plug-in has been installed ...

Posted on Sat, 29 Jun 2019 18:24:01 -0700 by Walle

Several Noticeable Problems in Spring Boot @OneToMany and @ManyToOne

@ If @JoinColumn is not added to OneToMany, the system will automatically add an intermediate table to the master-slave table.Main Table:@Entity(name = "Post") public class Post {       @Id     @GeneratedValue     private Long id;    &n ...

Posted on Fri, 28 Jun 2019 11:58:12 -0700 by happyme

Spring+Spring MVC+MyBatis Deep Learning and Building (IV):MyBatis Input and Output Mapping

For reprinting, please indicate the source: http://www.cnblogs.com/Joanna-Yan/p/6878529.html  I mentioned earlier. Spring+Spring MVC+MyBatis in-depth learning and building (3) - MyBatis global configuration file parsing 1. Input mapping The type of input parameter is specified by parameterType, which can be a simple type, a hashmap, a pojo w ...

Posted on Thu, 27 Jun 2019 19:47:09 -0700 by chrisdee