1. 安裝軟件：

MySQL

官網下載–>在根目錄下，新建文件夾my.ini–>

• 對mysql進行初始化
  • 配置環境變量，將mysql的bin目錄配置到path中；
  • 對mysql進行初始化，密碼設定等，
    
    啟動mysql

net start mysql
登錄mysql
mysql -uroot -p
建庫導入數據表
source ‘sql文件的文件路徑’

mysql-workbenth/navicat

裝載客戶端，可視化界面；本機上使用navicat
從官網下載，正常安裝即可；
建立連接即可

MyBatis

核心組件

• SqlSessionFactory:用于創建SqlSession的工廠類。
• SqlSession: MyBatis的核心組件，用于向數據庫執行SQL。
  -主配置文件:XML配置文件，可以對MyBatis的底層行為做出詳細的配置。
• Mapper接口:就是DAO接口（會有實現的機制，不用寫實現類），在MyBatis中習慣性的稱之為Mapper。
• Mapper映射器:用于編寫SQL，并將SQL和實體類映射的組件，采用XML、注解均可實現。·
• 示例：使用MyBatis對用戶表進行CRUD操作。

http://www.mybatis.org/mybatis-3
http://www.mybatis.org/spring

前三個組件被springboot整合，不需要自己實現

示例

前置操作
對用戶表user，用mybatis進行增刪改的操作
在項目中導入包

配置文件：

實體類：

代碼部分：
創建user類

package com.nowcoder.community.entity;import java.util.Date;public class User {private int id;private String username;private String salt;private String email;private int type;private int status;private String activationCode;private String headerUrl;private Date createTime;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getSalt() {return salt;}public void setSalt(String salt) {this.salt = salt;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}public int getType() {return type;}public void setType(int type) {this.type = type;}public int getStatus() {return status;}public void setStatus(int status) {this.status = status;}public String getActivationCode() {return activationCode;}public void setActivationCode(String activationCode) {this.activationCode = activationCode;}public String getHeaderUrl() {return headerUrl;}public void setHeaderUrl(String headerUrl) {this.headerUrl = headerUrl;}public Date getCreateTime() {return createTime;}public void setCreateTime(Date createTime) {this.createTime = createTime;}@Overridepublic String toString() {return "User{" +"id=" + id +", username='" + username + '\'' +", salt='" + salt + '\'' +", email='" + email + '\'' +", type=" + type +", status=" + status +", activationCode='" + activationCode + '\'' +", headerUrl='" + headerUrl + '\'' +", createTime=" + createTime +'}';} }

創建Usermapper的抽象類，訪問數據庫，在Dao層中寫。不用寫實現類，

package com.nowcoder.community.dao;import com.nowcoder.community.entity.User; import org.apache.ibatis.annotations.Mapper; import org.springframework.stereotype.Repository; //添加注解，裝配bean @Mapper public interface UserMapper {User selectById(int id);User selectByName(String name);User selectByEmail(String email);int insertUser(User user);int updateStatus(int id,int status);int updateHeader(int id,String headerUrl);int updatePassword(int id,String password); }

提供配置文件
mapper文件夾下創建*.xml文件

注意寫全限定名（完整的包名）

<?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.nowcoder.community.dao.UserMapper"><sql id="selectFields">id, username,password,salt,email,type,status,activation_code,header_url, create_time</sql><select id="selectById" resultType="User">select id, username,password,salt,email,type,status,activation_code,header_url, create_timefrom userwhere id=#{id}</select><select id="selectByame" resultType="User">select id, username,password,salt,email,type,status,activation_code,header_url, create_timefrom userwhere name=#{username}</select><select id="selectByame" resultType="User">select id, username,password,salt,email,type,status,activation_code,header_url, create_timefrom userwhere email=#{email}</select></mapper>

完整增改查的操作，并在測試類里面驗證

<?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.nowcoder.community.dao.UserMapper"><sql id="insertFields">id, username,password,salt,email,type,status,activation_code,header_url, create_time</sql><sql id="selectFields">id, username,password,salt,email,type,status,activation_code,header_url, create_time</sql><select id="selectById" resultType="User">select <include refid="selectFields"></include>from userwhere id=#{id}</select><select id="selectByame" resultType="User">select <include refid="selectFields"></include>from userwhere name=#{username}</select><select id="selectByame" resultType="User">select <include refid="selectFields"></include>from userwhere email=#{email}</select><insert id="insertUser" parameterType="User" keyProperty="id">insert into user (<include refid="insertFields"></include>)values(#{username},#{password},#{salt},#{email},#{type},#{status},#{activationCode},#{headerUrl},#{createTime})</insert><update id="updateStatus">update user set status=#{status} where id=#{id}</update><update id="updateHeader">update user set header_url=#{headerUrl} where id=#{id}</update><update id="updatePassword">update user set password=#{password} where id=#{id}</update> </mapper> package com.nowcoder.community;import com.nowcoder.community.dao.UserMapper; import com.nowcoder.community.entity.User; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringRunner;import java.util.Date;@RunWith(SpringRunner.class) @SpringBootTest @ContextConfiguration(classes = CommunityApplication.class) public class MapperTests {@Autowired//注入beanprivate UserMapper userMapper;@Testpublic void testSelectUser(){User user=userMapper.selectById(101);System.out.println(user);user=userMapper.selectByName("liubei");System.out.println(user);user=userMapper.selectByEmail("nowcoder101@sina.com");System.out.println(user);}@Testpublic void testInsertUser(){User user=new User();user.setUsername("test");user.setPassword("123456");user.setSalt("abc");user.setEmail("test@qq.com");user.setHeaderUrl("http://www.nowcoder.com/101.png");user.setCreateTime(new Date());int rows=userMapper.insertUser(user);System.out.println(user);System.out.println(user.getId());}@Testpublic void updateUser(){int rows=userMapper.updateStatus(150,1);System.out.println(rows);rows=userMapper.updateHeader(150,"http://www.nowcoder.com/101.png");System.out.println(rows);rows=userMapper.updatePassword(150,"123456789");System.out.println(rows);} }

調試技巧
設置日志級別

logger

#logging.level.com.nowcoder.community=debug
#logging.file=d:/work/data/nowcoder/community.log

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