springboot Mybatis 整合2.0版本
版權宣告:本文為博主原創文章,未經博主允許不得轉載。 https://blog.csdn.net/Winter_chen001/article/details/80010967
springboot終於迎來了2.0版本,很多新的特性讓springboot更加強大,之前使用1.5.6版本整合了Mybatis,現在2.0版本就已經不適用了,所以,在摸索中搭建了2.0版本整合Mybatis
個人開源專案
springboot+mybatis+thymeleaf+docker構建的個人站點開源專案(集成了個人主頁、個人作品、個人部落格)
推薦開源專案
開源的springboot介面文件元件swagger2
更多幹貨
SpringBoot系列目錄
寫在前面
本來這篇博文老在就寫好了,但是後來發現很多功能其實根本就沒有檢驗通過就發出來了,導致遺留了很多坑,比如最難搞的就是SqlSessionFactory和PageHelper,之前寫過關於springboot1.5.6版本的整合,這段時間剛好springboot釋出了2.0的正式版本,很多同學可能沒有注意版本,導致了整合的時候出現了很多很多的問題,這幾天剛好有空就試著整合一下springboot2.0 mybatis,發現了很多很多的坑,而且網上的資源也不多,終於在兩天的踩坑中成功整合了,並且將翻頁功能修復好了,廢話不多說了,看程式碼:
環境/版本一覽:
開發工具:Intellij IDEA 2017.1.3
springboot: 2.0.1.RELEASE
jdk:1.8.0_40
maven:3.3.9
alibaba Druid 資料庫連線池:1.1.9
額外功能:
PageHelper 分頁外掛
mybatis generator 自動生成程式碼外掛(本次搭建就不講解了,請參照Spring boot Mybatis 整合(完整版))
開始搭建:
建立專案:
新增基礎的依賴:
依賴檔案:
按照pom檔案補齊需要的依賴:
<?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.winterchen</groupId>
<artifactId>springboot2-mybatis-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>springboot2-mybatis-demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<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>1.3.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-joda</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.module</groupId>
<artifactId>jackson-module-parameter-names</artifactId>
</dependency>
<!-- 分頁外掛 -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.5</version>
</dependency>
<!-- alibaba的druid資料庫連線池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.9</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596
專案結構:
專案啟動類:
package com.winterchen;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.winterchen.dao")
public class Springboot2MybatisDemoApplication {
public static void main(String[] args) {
SpringApplication.run(Springboot2MybatisDemoApplication.class, args);
}
}
1234567891011121314
注意:@MapperScan("com.winter.mapper")這個註解非常的關鍵,這個對應了專案中mapper(dao)所對應的包路徑,很多同學就是這裡忘了加導致異常的
配置:
可以根據個人使用習慣選擇使用properties或者yml檔案,本專案使用的是yml配置檔案,所以把原本application.properties刪除,建立一個application.yml檔案
在resource資料夾下建立application.yml
server:
port: 8080
spring:
datasource:
name: mysql_test
type: com.alibaba.druid.pool.DruidDataSource
#druid相關配置
druid:
#監控統計攔截的filters
filters: stat
driver-class-name: com.mysql.jdbc.Driver
#基本屬性
url: jdbc:mysql://127.0.0.1:3306/mytest?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
username: root
password: root
#配置初始化大小/最小/最大
initial-size: 1
min-idle: 1
max-active: 20
#獲取連線等待超時時間
max-wait: 60000
#間隔多久進行一次檢測,檢測需要關閉的空閒連線
time-between-eviction-runs-millis: 60000
#一個連線在池中最小生存的時間
min-evictable-idle-time-millis: 300000
validation-query: SELECT 'x'
test-while-idle: true
test-on-borrow: false
test-on-return: false
#開啟PSCache,並指定每個連線上PSCache的大小。oracle設為true,mysql設為false。分庫分表較多推薦設定為false
pool-prepared-statements: false
max-pool-prepared-statement-per-connection-size: 20
## 該配置節點為獨立的節點,有很多同學容易將這個配置放在spring的節點下,導致配置無法被識別
mybatis:
mapper-locations: classpath:mapper/*.xml #注意:一定要對應mapper對映xml檔案的所在路徑
type-aliases-package: com.winterchen.model # 注意:對應實體類的路徑
#pagehelper
pagehelper:
helperDialect: mysql
reasonable: true
supportMethodsArguments: true
params: count=countSql
returnPageInfo: check
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849
建立包:
model,dao,mapper
建立資料庫和資料表
CREATE DATABASE mytest;
CREATE TABLE t_user(
userId INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
userName VARCHAR(255) NOT NULL ,
password VARCHAR(255) NOT NULL ,
phone VARCHAR(255) NOT NULL
) ENGINE=INNODB AUTO_INCREMENT=1000 DEFAULT CHARSET=utf8;12345678
建立實體類:UserDomain.java
package com.winterchen.model;
public class UserDomain {
private Integer userId;
private String userName;
private String password;
private String phone;
// get,set方法略...
}12345678910111213
建立dao:
UserDao.java
package com.winterchen.dao;
import com.winterchen.model.UserDomain;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
public interface UserDao {
int insert(UserDomain record);
List<UserDomain> selectUsers();
}123456789101112131415161718
建立mybatis對映檔案: UserMapper.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.winterchen.dao.UserDao" >
<sql id="BASE_TABLE">
t_user
</sql>
<sql id="BASE_COLUMN">
userId,userName,password,phone
</sql>
<insert id="insert" parameterType="com.winterchen.model.UserDomain">
INSERT INTO
<include refid="BASE_TABLE"/>
<trim prefix="(" suffix=")" suffixOverrides=",">
userName,password,
<if test="phone != null">
phone,
</if>
</trim>
<trim prefix="VALUES(" suffix=")" suffixOverrides=",">
#{userName, jdbcType=VARCHAR},#{password, jdbcType=VARCHAR},
<if test="phone != null">
#{phone, jdbcType=VARCHAR},
</if>
</trim>
</insert>
<select id="selectUsers" resultType="com.winterchen.model.UserDomain">
SELECT
<include refid="BASE_COLUMN"/>
FROM
<include refid="BASE_TABLE"/>
</select>
</mapper>12345678910111213141516171819202122232425262728293031323334353637
注意:<mapper namespace="com.winterchen.dao.UserDao" > 一定要對應自己dao所在的包路徑
建立剩餘的controller,service包和檔案
UserService.java
package com.winterchen.service.user;
import com.github.pagehelper.PageInfo;
import com.winterchen.model.UserDomain;
import java.util.List;
/**
* Created by Administrator on 2018/4/19.
*/
public interface UserService {
int addUser(UserDomain user);
PageInfo<UserDomain> findAllUser(int pageNum, int pageSize);
}
123456789101112131415161718
UserServiceImpl
package com.winterchen.service.user.impl;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.winterchen.dao.UserDao;
import com.winterchen.model.UserDomain;
import com.winterchen.service.user.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* Created by Administrator on 2017/8/16.
*/
@Service(value = "userService")
public class UserServiceImpl implements UserService {
@Autowired
private UserDao userDao;//這裡會報錯,但是並不會影響
@Override
public int addUser(UserDomain user) {
return userDao.insert(user);
}
/*
* 這個方法中用到了我們開頭配置依賴的分頁外掛pagehelper
* 很簡單,只需要在service層傳入引數,然後將引數傳遞給一個外掛的一個靜態方法即可;
* pageNum 開始頁數
* pageSize 每頁顯示的資料條數
* */
@Override
public PageInfo<UserDomain> findAllUser(int pageNum, int pageSize) {
//將引數傳給這個方法就可以實現物理分頁了,非常簡單。
PageHelper.startPage(pageNum, pageSize);
List<UserDomain> userDomains = userDao.selectUsers();
PageInfo result = new PageInfo(userDomains);
return result;
}
}
1234567891011121314151617181920212223242526272829303132333435363738394041424344
UserController.java
package com.winterchen.controller;
import com.github.pagehelper.PageHelper;
import com.winterchen.model.UserDomain;
import com.winterchen.service.user.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
/**
* Created by Administrator on 2017/8/16.
*/
@Controller
@RequestMapping(value = "/user")
public class UserController {
@Autowired
private UserService userService;
@ResponseBody
@PostMapping("/add")
public int addUser(UserDomain user){
return userService.addUser(user);
}
@ResponseBody
@GetMapping("/all")
public Object findAllUser(
@RequestParam(name = "pageNum", required = false, defaultValue = "1")
int pageNum,
@RequestParam(name = "pageSize", required = false, defaultValue = "10")
int pageSize){
return userService.findAllUser(pageNum,pageSize);
}
}
12345678910111213141516171819202122232425262728293031323334353637
專案最終的結構
到這裡如果專案就成功搭建完成了,如果還是報錯的話,請仔細看看配置,後面會給出原始碼地址,程式設計師就是要不斷和bug進行鬥爭,加油。
測試
啟動專案
這樣就表示啟動成功了
然後,開始測試吧,博主使用的是postMan,一個進行http請求的測試工具
新增資料
查詢資料
如果需要使用多資料來源的請戳這裡
原始碼地址:
https://github.com/WinterChenS/springboot2-mybatis-demo
springboot技術交流群:681513531
---------------------
來源:CSDN
原文:https://blog.csdn.net/Winter_chen001/article/details/80010967
版權宣告:本文為博主原創文章,轉載請附上博文連結!