Should the DAO layer be tested? # There is a lot of discussion online about whether unit testing should include testing at the DAO layer. The author feels that for some businesses that are mainly CRUD, the service layer and controller layer will be very thin, and the main logic falls on the mapper. At […]
Tag: dao
Dao development of Mybatis
Mybatis core objects SqlSessionFactoryBuilder SqlSessionFactoryBuilder is used to create SqlSessionFacoty. Once SqlSessionFacoty is created, SqlSessionFactoryBuilder is no longer needed. Because SqlSession is produced through SqlSessionFactory, SqlSessionFactoryBuilder can be used as a tool class. The best scope of use is local variables in static code blocks. SqlSessionFactory SqlSessionFactory is an interface that defines different overloaded methods […]
DbUtils + Druid implements JDBC operations — Attached is BaseDao
Article directory Apache-DBUtils implements CRUD operations 1 Introduction to Apache-DBUtils 2 Usage of main API 2.1 DbUtils 2.2 QueryRunner class 2.3 ResultSetHandler interface and implementation class 3 JDBCUtil tool class writing 3.1 Guide package 3.2 Writing configuration files 3.3 Writing code 4BaseDao written Apache-DBUtils implements CRUD operations 1 Introduction to Apache-DBUtils commons-dbutils is an open […]
jdbc uses data source connection pool technology to upgrade BaseDao
jdbc.driver=com.mysql.cj.jdbc.Driver jdbc.url=jdbc:mysql:///fruitdb jdbc.user=root jdbc.pwd=123456 jdbc.init_size=5 jdbc.max_active=20 jdbc.max_wait=3000 package com.csdn.mymvc.dao; import com.alibaba.druid.pool.DruidDataSource; import com.csdn.mymvc.util.ClassUtil; import javax.sql.DataSource; import java.io.IOException; import java.io.InputStream; import java.lang.reflect.ParameterizedType; import java.lang.reflect.Type; import java.sql.*; import java.util.ArrayList; import java.util.List; import java.util.Properties; public abstract class BaseDao<T> { private String entityClassName; public BaseDao() { //Who is this? This represents the instance object of FruitDaoImpl. Because BaseDao is […]
The use of javassist, and the simple implementation of the GenerateDaoProxy mechanism (getMapper method) in MyBatis using javassist
The use of javassist, and the simple implementation of the GenerateDaoProxy mechanism in MyBatis using javassist 1. What is javassist? 2. Simply use javassist: here we only consider simple implementation classes through interfaces 3. Provide tool classes for SqlSession 4. Dynamically generate a simple Dao implementation class: 1. What is javassist? Javaassist is a class […]
NC custom buttons, pop-up windows, pop-up window reference input boxes, BaseDao operation database, plug-in development
NC custom button Configure xml to generate corresponding java classes <?xml version=”1.0″ encoding=”GBK”?> <!DOCTYPE beans PUBLIC “.//SPRING//DTD BEAN//EN” “http://www.springframework.org/dtd/spring-beans.dtd”> <beans> <!–Add button card–> <bean class=”nc.ui.pubapp.plugin.action.InsertActionInfo”> <property name=”actionContainer” ref=”actionsOfCard” /> <property name=”actionType” value=”notedit” /> <property name=”target” ref=”browLinkActionGroup” /> <property name=”pos” value=”after” /> <property name=”action” ref=”WaybillInfoAction” /> </bean> <!–New button is displayed in the list–> <bean class=”nc.ui.pubapp.plugin.action.InsertActionInfo”> […]
Use DAO (Data Access Object) data access object design, use jdbc to complete access to the database, and use junit to complete testing.
<dependencies> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.10</version> <scope>compile</scope> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.28</version> <scope>compile</scope> </dependency> </dependencies> package com.csdn.fruit.pojo; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; import java.io.Serializable; @Data @NoArgsConstructor @AllArgsConstructor public class Fruit implements Serializable { private Integer fid; private String fname; private Integer price; private Integer fcount; private String remark; public […]
python to create digital Huarongdao game
This article will use python to create a digital Huarong Road game All standard libraries are used, no need to use third-party libraries, just copy and run. Use wasd or move up, down, left, and right. When the numbers form an orderly combination, you can pass the level. The source code is as follows: #Production: […]
Mutual evaluation-OO interface-DAO pattern code reading and application
1.What is the difference between StudentDaoListImpl.java and StudentDaoArrayImpl.java? ①The ways of storing student objects are different. DaoListImpl uses ArrayList storage, and DapArrayImpl uses object array storage. ②The implementation of the getStuByName method and the addStudent method in the StudenDao interface are different. 2. What is the StudentDao.java file used for? Why is there no implementation […]
Wangdao data structure sequence table and singly linked list code (C++ version)
1. Sequence table #include <stdlib.h> #include <stdio.h> #include <iostream> using namespace std; //Set the maximum capacity of the sequence table #define Maxsize 50 //Definition of sequence table typedef struct { // sequence table data int data[Maxsize]; //Sequence table length int length; } Sqlist; //Initialization sequence table bool InitList(Sqlist &L) { //Initialize the length of the […]