Posted on Sun, 19 Jan 2020 09:50:36 -0500 by Kingskin
`xml ` parsing class ` XMLConfigBuilder`
The 'SqlSession' series of database transactions
Abstract factory ` SqlSessionFactory`
Default implementation factory ` DefaultSqlSessionFactory`
Default implementation ` DefaultSqlSession`
Builder mode ...
Posted on Sat, 18 Jan 2020 07:20:39 -0500 by konrados
Go back to basics. Today, let's see the execution process of mybatis.
1, The first is the configuration file. You need an xml configuration file
<?xml version="1.0" encoding="UTF-8" ?>
Posted on Sat, 18 Jan 2020 07:05:31 -0500 by gromer
Learning objectives: master the following sql functions
Digital function: format ABS mod ceil floor ground expCharacter function: upper lower char > length concat instrDate function: now date? Format date? Add DateDiff if ifnullConditional function:
First batch of digital functi ...
Posted on Fri, 17 Jan 2020 09:10:21 -0500 by DKY
The principle of color image acquisition of OV7725 camera and LCD display "one"
Posted on Thu, 16 Jan 2020 22:58:49 -0500 by hustler
Modify data record
Q object - Q()
Native database operation method
The query of database needs to use manager object
Call the query interface through the MyModel.ob ...
Posted on Thu, 16 Jan 2020 10:21:54 -0500 by scotchegg78
1. Principle of mybatis plug-in
MyBatis has plug-ins involved in the creation of four objects. The plug-in can use the dynamic proxy mechanism to wrap the target object layer by layer, and achieve the effect of intercepting before the target object executes the target method.
When creating four object ...
Posted on Thu, 16 Jan 2020 10:20:49 -0500 by thirdeye
Naive Bayes classifier is a classifier with low variance and high deviation. It assumes that there is conditional independence between each feature: for a given category, all features are independent of each other. Obviously, this assumption makes the problem too simple, but naive Bayes does ...
Posted on Thu, 16 Jan 2020 10:05:20 -0500 by sp2hari
1, SQL Basics
Four, actual combat
3. table / field
4. Index (add, delete, modify and check)
Like 👍 pay attention ❤ don't get lost
1, SQL Basics
SELECT Column name FROM Table name
SELECT DISTINCT Colum ...
Posted on Thu, 16 Jan 2020 07:32:51 -0500 by kaumilpatel
MySQL is a kind of relational database, which has strong query function, high data consistency, high data security and supports secondary index. However, the performance is slightly inferior to that of non relational databases, especially for data above one million levels, which is easy to cause slow query. At this time, we need to ana ...
Posted on Thu, 16 Jan 2020 02:02:29 -0500 by nuying117