Springboot 整合Mybatis，用模板引擎thymeleaf，實現數據庫的連接

這裏寫的是Springboot整合Mybatis實現一個最基本的增刪改查功能，整合的方式有兩種一種是註解形式的，也就是沒有Mapper.xml文件，還有一種是XML形式的，這裏寫的是整合mybaits　寫入xml方式

註解版：https://baijiahao.baidu.com/s?id=1653043822915271722&wfr=spider&for=pc

目錄：

1、配置pom.xml

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.springboot</groupId>
    <artifactId>parent</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  <artifactId>Mybaris</artifactId>
  
  <dependencies>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.1</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		
			    <!-- 數據庫驅動座標 -->
	    <dependency>
		   <groupId>mysql</groupId>
		   <artifactId>mysql-connector-java</artifactId>
	       <version>8.0.11</version>
	    </dependency>

		<!-- alibaba的druid的數據庫連接池 -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid-spring-boot-starter</artifactId>
			<version>1.1.0</version>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.0.11</version>
		</dependency>
		<!-- 分頁插件 -->
		<dependency>
			<groupId>com.github.pagehelper</groupId>
			<artifactId>pagehelper-spring-boot-starter</artifactId>
			<version>1.1.2</version>
		</dependency>

      <!--thymeleaf啓動器  -->
        <dependency>
		   <groupId>org.springframework.boot</groupId>
		   <artifactId>spring-boot-starter-thymeleaf</artifactId>
	    </dependency>
	

	    
	    <!-- Druid數據源依賴 -->
	    <dependency>
		   <groupId>com.alibaba</groupId>
		   <artifactId>druid</artifactId>
	       <version>1.1.12</version>
	    </dependency>
	    
	    <dependency>

              <groupId>net.sourceforge.nekohtml</groupId>

               <artifactId>nekohtml</artifactId>

              <version>1.9.22</version>
        </dependency>
	</dependencies>
  
  
  
  
</project>

2、配置application.yml

spring:
  mvc:
    static-path-pattern: /**
  datasource: 
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mobiledb?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=UTC
    username: root
    password: 123456
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true
    connection-properties: druid.stat.mergeSql:true;druid.stat.slowSqlMillis:5000
  thymeleaf: 
    cache: false
    content-type: text/html
    check-template-location: true
    mode: LEGACYHTML5
    enabled: true
    prefix: classpath:/templates/
    suffix: .html

pagehelper:
  helperDialect: mysql
  reasonable: true
  supportMethodsArguments: true
  params: count=countSql
mybatis:
  mapper-locations: classpath:mappers/UsersMapper.xml
  config-location: classpath:mybatis/mybatis-config.xml 
  templates-locations: templates/addUser.html

3、配置mybatis-config.xml

<?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>

    <settings>
        <!--適應駝峯-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
</configuration>

4、運用逆向工程生成的相關代碼：

Users.java

package com.mall.pojo;

public class Users {
    private String user;

	private Long currentConnections;

	private Long totalConnections;

	public String getUser() {
		return user;
	}

	public void setUser(String user) {
		this.user = user == null ? null : user.trim();
	}

	public Long getCurrentConnections() {
		return currentConnections;
	}

	public void setCurrentConnections(Long currentConnections) {
		this.currentConnections = currentConnections;
	}

	public Long getTotalConnections() {
		return totalConnections;
	}

	public void setTotalConnections(Long totalConnections) {
		this.totalConnections = totalConnections;
	}

	private Integer userid;

    private String username;

    private String usersex;

    public Integer getUserid() {
        return userid;
    }

    public void setUserid(Integer userid) {
        this.userid = userid;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username == null ? null : username.trim();
    }

    public String getUsersex() {
        return usersex;
    }

    public void setUsersex(String usersex) {
        this.usersex = usersex == null ? null : usersex.trim();
    }
}

UsersMapper.java

package com.mall.mapper;

import com.mall.pojo.Users;

public interface UsersMapper {
    int insert(Users record);

	int insertSelective(Users record);

	int deleteByPrimaryKey(Integer userid);

    Users selectByPrimaryKey(Integer userid);

    int updateByPrimaryKeySelective(Users record);

    int updateByPrimaryKey(Users record);
}

UsersMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.mall.mapper.UsersMapper">
  <resultMap id="BaseResultMap" type="com.mall.pojo.Users">
    <result column="USER" jdbcType="CHAR" property="user" />
    <result column="CURRENT_CONNECTIONS" jdbcType="BIGINT" property="currentConnections" />
    <result column="TOTAL_CONNECTIONS" jdbcType="BIGINT" property="totalConnections" />
  </resultMap>

  <sql id="Base_Column_List">
    userid, username, usersex
  </sql>
  <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from users
    where userid = #{userid,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
    delete from users
    where userid = #{userid,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="com.mall.pojo.Users">
    insert into users (userid, username, usersex
      )
    values (#{userid,jdbcType=INTEGER}, #{username,jdbcType=VARCHAR}, #{usersex,jdbcType=VARCHAR}
      )
  </insert>
  <insert id="insertSelective" parameterType="com.mall.pojo.Users">
    insert into users
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="userid != null">
        userid,
      </if>
      <if test="username != null">
        username,
      </if>
      <if test="usersex != null">
        usersex,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
      <if test="userid != null">
        #{userid,jdbcType=INTEGER},
      </if>
      <if test="username != null">
        #{username,jdbcType=VARCHAR},
      </if>
      <if test="usersex != null">
        #{usersex,jdbcType=VARCHAR},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.mall.pojo.Users">
    update users
    <set>
      <if test="username != null">
        username = #{username,jdbcType=VARCHAR},
      </if>
      <if test="usersex != null">
        usersex = #{usersex,jdbcType=VARCHAR},
      </if>
    </set>
    where userid = #{userid,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.mall.pojo.Users">
    update users
    set username = #{username,jdbcType=VARCHAR},
      usersex = #{usersex,jdbcType=VARCHAR}
    where userid = #{userid,jdbcType=INTEGER}
  </update>
</mapper>

5、業務層接口

package com.mall.services;

import java.util.List;

import com.mall.pojo.Users;


public interface UsersService {
  void addUser(Users users);
  List<Users> selectUserall();
  Users selectUserid(Integer id);
  void updataUser(Users users);
  void deleteUser(Integer id);
}

業務層實現類

package com.mall.services;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.mall.mapper.UsersMapper;
import com.mall.pojo.Users;


/**
 * 
 * 用戶管理業務層
 *
 */

@Service
public class UserServiceImpl implements UsersService {

	@Autowired
	private UsersMapper usersMapper;
	
	/**
	 * 添加用戶
	 */
		
	@Override
	@Transactional
	public void addUser(Users users) {
		this.usersMapper.insert(users);

	}
  
	/**
	 * 查詢所有用戶
	 */
	@Override
	public List<Users> selectUserall() {
	    
		return null;
	}

	/**
	 * 預更新
	 */
	@Override
	public Users selectUserid(Integer id) {
		// TODO Auto-generated method stub
		return this.usersMapper.selectByPrimaryKey(id);
	}

	/**更新
	 * 
	 */
	@Override
	public void updataUser(Users users) {
		this.usersMapper.updateByPrimaryKey(users);
		
	}



	@Override
	public void deleteUser(Integer id) {
		this.usersMapper.deleteByPrimaryKey(id);
		
	}




}

6、Controller 控制層

跳轉頁面：

package com.Controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
/**
 * 頁面跳轉
 * 
 *
 */
public class pageController {

	@RequestMapping("/{page}")
	public String showPage(@PathVariable String page) {
		return page;
	}
}

控制頁面：

package com.Controller;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import com.mall.pojo.Users;
import com.mall.services.UsersService;


@Controller
@RequestMapping("/user")
public class Usercontroller {	
	
	
	@Autowired
	private UsersService usersService;
	
	/**
	 * 添加用戶
	 * @return
	 */
	@PostMapping("/addUser")
	public String showInfo(Users users) {
		try {
			System.out.println("11111111111111");
			this.usersService.addUser(users);
			System.out.println("3333333333333333");
		}catch (Exception e) {
			e.printStackTrace();
			System.out.println("3444444");
			return "error";
		}
		
		return "redirect:/OK";
				
	}
	
	
	/**
	 * 查詢用戶
	 * @return
	 */
	@GetMapping("/selectUserall")
	public String selectInfo(Model model) {
		List<Users> list=null;
		try {
			list=this.usersService.selectUserall();
			model.addAttribute("list",list);
		}catch (Exception e) {
			e.printStackTrace();
			return "error";
		}		
		return "showUsers";
				
	}
	
	/**
	 * 預更新用戶
	 * @return
	 */
	@GetMapping("/selectUserid")
	public String selectid(Integer id,Model model) {		
		try {
			Users user=this.usersService.selectUserid(id);
			model.addAttribute("user", user);
		}catch (Exception e) {
			e.printStackTrace();
			return "error";
		}		
		return "updataUser";
				
	}
	
	
	/**
	 * 更新用戶
	 * @return
	 */
	@PostMapping("/updataUser")
	public String updataUser(Users users) {
		try {
			this.usersService.updataUser(users);
		}catch (Exception e) {
			e.printStackTrace();
			return "error";
		}
		
		return "redirect:/OK";
				
	}
	
	/**
	 * 刪除用戶
	 * @return
	 */
	@GetMapping("/delectUser")
	public String delectUser(Integer id) {
		try {
			this.usersService.deleteUser(id);
		}catch (Exception e) {
			e.printStackTrace();
			return "error";
		}
		
		return "redirect:/OK";
				
	}
	
	
	
}

7、啓動類

package Test;

import org.mybatis.spring.annotation.MapperScan;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication(scanBasePackages={"com.Controller","com.mall.services","com.mall.pojo"})
@MapperScan(basePackages = {"com.mall.mapper"})
public class Test {
	  public static void main(String[] args) {
		SpringApplication.run(Test.class, args);
	}

}

運行完成