項(xiàng)目實(shí)現(xiàn)的功能

查詢所有用戶信息
通過(guò)Id查詢用戶信息
添加用戶（回顯主鍵）
修改用戶信息
刪除用戶信息
通過(guò)用戶名字模糊查詢

一、引入依賴和工程結(jié)構(gòu)

<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.william</groupId><artifactId>MybatisCRUD</artifactId><version>1.0-SNAPSHOT</version><properties><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target></properties><dependencies><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.47</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.4.5</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version></dependency><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.17</version></dependency></dependencies></project>

二、創(chuàng)建實(shí)體類

User

package com.william.domain;import java.util.Date;/*** @author ：lijunxuan* @date ：Created in 2019/7/9 19:28* @description ：* @version: 1.0*/ public class User {private Integer id;private String username;private String password;private String sex;private Date birthday;@Overridepublic String toString() {return "User{" +"id=" + id +", username='" + username + '\'' +", password='" + password + '\'' +", sex='" + sex + '\'' +", birthday=" + birthday +'}';}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}}

三、映射文件

1.UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.william.mapper.UserMapper"><!--查詢所有用戶信息--><select id="findAll" resultType="com.william.domain.User">select * from user</select><!--通過(guò)ID查詢用戶信息--><select id="findById" parameterType="java.lang.Integer" resultType="com.william.domain.User">select * from user where id=#{id}</select><!--模糊查詢--><select id="findByUsername" parameterType="java.lang.String" resultType="com.william.domain.User">select * from user where username like "%"#{value}"%"</select><!--增加用戶信息--><insert id="insert" parameterType="com.william.domain.User">-- 主鍵回顯<selectKey resultType="java.lang.Integer" keyColumn="id" keyProperty="id" order="AFTER" >select last_insert_id()</selectKey>insert into user values (null ,#{username},#{password},#{sex},#{birthday})</insert><!--更新用戶信息--><update id="update" parameterType="com.william.domain.User">update user set username=#{username},password=#{password},sex=#{sex},birthday=#{birthday} where id=#{id}</update><!--刪除用戶信息--><delete id="delete" parameterType="java.lang.Integer">delete from user where id =#{id}</delete> </mapper>

2.Mybatis-configuration.xml

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration><environments default="development"><environment id="development"><transactionManager type="JDBC"/><dataSource type="POOLED"><property name="driver" value="com.mysql.jdbc.Driver"/><property name="url" value="jdbc:mysql://localhost:3306/web02"/><property name="username" value="root"/><property name="password" value="root"/></dataSource></environment></environments><mappers><mapper resource="com/william/mapper/UserMapper.xml"/></mappers> </configuration>

四、引入log4j

log4j.properties

# Set root category priority to INFO and its only appender to CONSOLE. #log4j.rootCategory=INFO, CONSOLE debug info warn error fatal log4j.rootCategory=debug, CONSOLE, LOGFILE, info# Set the enterprise logger category to FATAL and its only appender to CONSOLE. log4j.logger.org.apache.axis.enterprise=FATAL, CONSOLE# CONSOLE is set to be a ConsoleAppender using a PatternLayout. log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n# LOGFILE is set to be a File appender using a PatternLayout. log4j.appender.LOGFILE=org.apache.log4j.FileAppender log4j.appender.LOGFILE.File=d:\axis.log log4j.appender.LOGFILE.Append=true log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout log4j.appender.LOGFILE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n

五、測(cè)試類

TestMybatis

package com.william; import com.william.domain.User; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import org.junit.Test; import java.io.InputStream; import java.util.Date; import java.util.List; /*** @author ：lijunxuan* @date ：Created in 2019/7/9 19:45* @description ：* @version: 1.0*/ public class TestMybatis {/*** 查詢所有用戶信息*/@Testpublic void selectList(){InputStream inputStream = Resources.class.getClassLoader().getResourceAsStream("Mybatis-configuration.xml");SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);SqlSession sqlSession = sqlSessionFactory.openSession();List<User> selectList = sqlSession.selectList("com.william.mapper.UserMapper.findAll");for (Object o : selectList) {System.out.println(o);}sqlSession.close();}/***通過(guò)Id查詢用戶信息**/@Testpublic void findById(){InputStream inputStream = Resources.class.getClassLoader().getResourceAsStream("Mybatis-configuration.xml");SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);SqlSession sqlSession = sqlSessionFactory.openSession();User selectOne = sqlSession.selectOne("com.william.mapper.UserMapper.findById", 43);System.out.println(selectOne.getUsername());sqlSession.close();}/*** 添加用戶*/@Testpublic void InsertUser(){InputStream inputStream = Resources.class.getClassLoader().getResourceAsStream("Mybatis-configuration.xml");SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);SqlSession sqlSession = sqlSessionFactory.openSession();User user = new User();user.setUsername("黑衣人");user.setPassword("123456");user.setSex("男");user.setBirthday(new Date());sqlSession.insert("com.william.mapper.UserMapper.insert",user);//回顯剛剛添加用戶的IDSystem.out.println("添加之后的主鍵id為："+user.getId());sqlSession.commit();sqlSession.close();}/*** 修改用戶信息*/@Testpublic void UpdateUser(){InputStream inputStream = Resources.class.getClassLoader().getResourceAsStream("Mybatis-configuration.xml");SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);SqlSession sqlSession = sqlSessionFactory.openSession();User user = new User();user.setId(43);user.setUsername("黑衣人");user.setPassword("123456");user.setSex("男");user.setBirthday(new Date());sqlSession.update("com.william.mapper.UserMapper.update",user);sqlSession.commit();sqlSession.close();}/*** 刪除用戶信息*/@Testpublic void deleteUser(){InputStream inputStream = Resources.class.getClassLoader().getResourceAsStream("Mybatis-configuration.xml");SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);SqlSession sqlSession = sqlSessionFactory.openSession();sqlSession.delete("com.william.mapper.UserMapper.delete",42);sqlSession.commit();sqlSession.close();}/*** 模糊查詢* 通過(guò)用戶名字模糊查詢*/@Testpublic void findByUsername(){InputStream inputStream = Resources.class.getClassLoader().getResourceAsStream("Mybatis-configuration.xml");SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);SqlSession sqlSession = sqlSessionFactory.openSession();List<User> selectList = sqlSession.selectList("com.william.mapper.UserMapper.findByUsername","a");for (Object o : selectList) {System.out.println(o);}sqlSession.close();} }

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