CRUD operation of mybatis, Silicon Valley-mybatiscrud

CRUD operation of mybatis, Silicon Valley-mybatiscrud

Project Structure:

User entity code:

package com.atguigu.mybatis.bean;public class User {private int id;private String name;private int age;public User() {super();}public User(int id, String name, int age) {super();this.id = id;this.name = name;this.age = age;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}@Overridepublic String toString() {return "User [id=" + id + ", name=" + name + ", age=" + age + "]";}}

UserMapper. xml ing file code:

<? Xml version = "1.0" encoding = "UTF-8"?> <! DOCTYPE mapper PUBLIC "-// mybatis.org//DTD Mapper 3.0 //" http://mybatis.org/dtd/mybatis-3-mapper.dtd "> <mapper namespace =" com. atguigu. mybatis. bean. userMapper "> <! -- CRUD operation --> <insert id = "addUser" parameterType = "User"> insert into users (name, age) values (# {name },# {age }) </insert> <delete id = "deleteUser" parameterType = "int"> delete from users where id =#{ id} </delete> <update id = "updateUser" parameterType = "User"> update users set name =#{ name }, age = # {age} where id = # {id} </update> <select id = "getUser" parameterType = "int" resultType = "User"> select * from users where id = # {id} </select> <select id = "getAllUsers" resultType = "User"> select * from users </select> </mapper>

UserMapper annotation class code (either in xml or annotation ):

package com.atguigu.mybatis.test2;import java.util.List;import org.apache.ibatis.annotations.Delete;import org.apache.ibatis.annotations.Insert;import org.apache.ibatis.annotations.Select;import org.apache.ibatis.annotations.Update;import com.atguigu.mybatis.bean.User;public interface UserMapper {@Insert("insert into users(name,age) values(#{name},#{age})")public int add(User user);@Delete("delete from users where id=#{id}")public int deleteById(int id);@Update("update users set name=#{name},age=#{age} where id=#{id}")public int update(User user);@Select("select * from users where id=#{id}")public User getById(int id);@Select("select * from users")public List<User> getAll();}

Obtain the MybatisUtils code of the SqlSessionFactory Factory:

package com.atguigu.mybatis.utils;import java.io.InputStream;import org.apache.ibatis.session.SqlSessionFactory;import org.apache.ibatis.session.SqlSessionFactoryBuilder;public class MybatisUtils {public static SqlSessionFactory getFactory() {String resource = "conf.xml";InputStream inputStream = MybatisUtils.class.getClassLoader().getResourceAsStream(resource);SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);return factory;}}

Configuration File conf. xml code:

<? Xml version = "1.0" encoding = "UTF-8"?> <! DOCTYPE configuration PUBLIC "-// mybatis.org//DTD Config 3.0 // EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <properties resource = "db. properties"/> <! -- Define aliases for object classes to simplify SQL ing references in xml files --> <typeAliases> <! -- <TypeAlias type = "com. atguigu. mybatis. bean. User" alias = "User"/> --> <! -- All classes in this package are named as entity classes (for example, the alias of the User class is User) --> <package name = "com. atguigu. mybatis. bean "/> </typeAliases> <! -- Development: development Mode work: working Mode --> <environments default = "development"> <environment id = "development"> <transactionManager type = "JDBC"/> <dataSource type = "POOLED"> <property name = "driver" value = "$ {driver}"/> <property name = "url" value = "$ {url}"/> <property name = "username" value = "$ {name}"/> <property name = "password" value = "$ {password}"/> </dataSource> </environment> </environments> <mappers> <mapper resource = "com/atguigu/mybatis/bean/userMapper. xml "/> <mapper class =" com. atguigu. mybatis. test2.UserMapper "/> </mappers> </configuration>

Test class Test2 code:

Package com. atguigu. mybatis. test2; import java. util. list; import org. apache. ibatis. session. sqlSession; import org. apache. ibatis. session. sqlSessionFactory; import org. junit. test; import com. atguigu. mybatis. bean. user; import com. atguigu. mybatis. utils. mybatisUtils;/** test: Implementation of XML for CRUD operations and implementation of Annotations */public class Test2 {// ---------------------------------- Implementation of test XML @ Testpublic void testAdd () {SqlSessionFactory factory = MybatisUtils. getFactory (); // SqlSession session = factory submitted manually by default. openSession (); String statement = "com. atguigu. mybatis. bean. userMapper. addUser "; int insert = session. insert (statement, new User (-1, "KK", 23); // submit the transaction session. commit (); session. close (); System. out. println (insert) ;}@ Testpublic void testUpdate () {SqlSessionFactory factory = MybatisUtils. getFactory (); // by default, SqlSession session = factory is submitted manually. openSession (true); String statement = "com. atguigu. mybatis. bean. userMapper. updateUser "; int update = session. update (statement, new User (3, "KKK111", 25); session. close (); System. out. println (update) ;}@ Testpublic void testDelete () {SqlSessionFactory factory = MybatisUtils. getFactory (); // by default, SqlSession session = factory is submitted manually. openSession (true); String statement = "com. atguigu. mybatis. bean. userMapper. deleteUser "; int delete = session. delete (statement, 3); session. close (); System. out. println (delete) ;}@ Testpublic void testGetUser () {SqlSessionFactory factory = MybatisUtils. getFactory (); // by default, SqlSession session = factory is submitted manually. openSession (true); String statement = "com. atguigu. mybatis. bean. userMapper. getUser "; User user = session. selectOne (statement, 1); session. close (); System. out. println (user) ;}@ Testpublic void testGetAll () {SqlSessionFactory factory = MybatisUtils. getFactory (); // by default, SqlSession session = factory is submitted manually. openSession (true); String statement = "com. atguigu. mybatis. bean. userMapper. getAllUsers "; List <User> list = session. selectList (statement); session. close (); System. out. println (list);} // -------------------------------- Implementation of the test annotation @ Testpublic void testAdd2 () {SqlSessionFactory factory = MybatisUtils. getFactory (); SqlSession session = factory. openSession (true); UserMapper mapper = session. getMapper (UserMapper. class); int add = mapper. add (new User (-1, "SS", 34); session. close (); System. out. println (add );}}

Database Configuration code db. properties:

driver=com.mysql.jdbc.Driverurl=jdbc:mysql://localhost:3306/mybatisname=rootpassword=123456

You can add the log4j configuration file under src to print the log information:

--> First add log4j-1.2.16.jar

--> Then:

Log4j. properties (method 1)

        log4j.properties，log4j.rootLogger=DEBUG, Console#Consolelog4j.appender.Console=org.apache.log4j.ConsoleAppenderlog4j.appender.Console.layout=org.apache.log4j.PatternLayoutlog4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%nlog4j.logger.java.sql.ResultSet=INFOlog4j.logger.org.apache=INFOlog4j.logger.java.sql.Connection=DEBUGlog4j.logger.java.sql.Statement=DEBUGlog4j.logger.java.sql.PreparedStatement=DEBUG

Log4j. xml (method 2)

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"><log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"><appender name="STDOUT" class="org.apache.log4j.ConsoleAppender"><layout class="org.apache.log4j.PatternLayout"><param name="ConversionPattern" value="%-5p %d{MM-dd HH:mm:ss,SSS} %m  (%F:%L) \n" /></layout></appender><logger name="java.sql"><level value="debug" /></logger><logger name="org.apache.ibatis"><level value="debug" /></logger><root><level value="debug" /><appender-ref ref="STDOUT" /></root></log4j:configuration>