Chapter 1: Spring's IOC implementation of CRUD
1.1 - Requirements and technical requirements
Requirement: realize CRUD operation of account
Using spring's IoC to manage objects
Using dbutils as a persistence layer solution
Using c3p0 data source
1.2 - environment construction
1.2.1-Maven project import dependency
Posted by davinci on Thu, 13 Feb 2020 23:29:13 -0800
It's a little complicated. I'm confused today.
First, put in the pages you need
This person wrote a function in SQL server. You can find the parent node from the child node or all the child nodes from the parent node. It's powerful, and it uses recursion.
Posted by MikeTyler on Thu, 13 Feb 2020 13:14:42 -0800
1. Database table initialization
Table mygoods is the commodity table, cat_id is the classification ID, goods_id is the commodity ID, and status is the current status bit of the commodity (1: valid, 0: invalid). The table creation statement is as follows:
CREATE TABLE `mygoods` (
`goods_id` int(11) unsigned NOT NULL AUTO_IN ...
Posted by moise on Thu, 13 Feb 2020 08:59:43 -0800
Getting started with mysql 01
What is a database?
Classification of database
The construction of mysql database
View initial password
Login with initial password & & modify initial password
Modify password policy
Posted by burge124 on Thu, 13 Feb 2020 04:46:37 -0800
Just about to leave work, I was stopped by a development colleague. Let's see a strange problem: the query method of the same Mapper interface of Mybatis, the first return result is different from the second return result. I can't think about it!
Talk is heap. Show me the code
mapper interface definition
public interface GoodsTrackMap ...
Posted by jonorr1 on Wed, 12 Feb 2020 18:53:50 -0800
1. Execution of getById
Previous As mentioned, when Mapper.java is created, it is created as a jdk proxy and the proxy processing class is MapperProxy.
So when the getById method of UserMapper is executed, the invoke method is executed in MapperProxy.
public Object invoke(Object proxy, Method method, Object[ ...
Posted by Darkwoods on Wed, 12 Feb 2020 10:28:46 -0800
RocketMQ 4: filter messages
1, Filter messages
1. Tag filtration
2. Basic SQL syntax
3. Implement message producer
4. Realize message consumers
2, Transaction message
1. Transaction message sending and submission
2. Transaction compensation
3. Transaction message status
4. Create transactional pro ...
Posted by rocket on Wed, 12 Feb 2020 05:53:12 -0800
This blog is a reading note of "data analysis by Python". Please do not reprint it for other business purposes.
1. Hierarchical index
1.1 reorder and hierarchy
1.2 summary statistics by level
2. Join and merge datasets
2.1 database style DataFrame connection
2.2 merge by ...
Posted by AustinP on Wed, 12 Feb 2020 04:56:09 -0800
During the epidemic, did you feel sick when you were staying at home~~
The company has opened VPN, mobile computers can connect, mobile phones can work with APP test package, so walking has been at home for 11 days since entering Beijing on February 1, 2020. These two days at home telecomm ...
Posted by zplits on Tue, 11 Feb 2020 23:57:07 -0800
1. Classification of database languages
DDL: Database Definition Language
Used to create, modify, and delete data structures within a database, such as:
1: Create and delete databases (CREATE DATABASE || DROP DATABASE);
2: Create, modify, rename, delete tables (CREATE TABLE | ALTER TABLE | RENAME TABLE | DROP TABLE, TRUNCATE TABLE);
3: Create a ...
Posted by timmerk on Tue, 11 Feb 2020 20:46:07 -0800