Spring boot Mybatis 整合(完整版)
2021-05-31 19:04
标签:方法 filter charset ack enable dstat actor sub produce
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SpringBoot系列目录
正题
本项目使用的环境:
开发工具:Intellij IDEA 2017.1.3
springboot: 1.5.6
jdk:1.8.0_161
maven:3.3.9
额外功能
PageHelper 分页插件
mybatis generator 自动生成代码插件
步骤:
1.创建一个springboot项目:
2.创建项目的文件结构以及jdk的版本
3.选择项目所需要的依赖
然后点击finish
5.看一下文件的结构:
6.查看一下pom.xml:
springboot-mybatis-demo
spring-boot-starter-parent
mybatis-spring-boot-starter
spring-boot-starter-thymeleaf
spring-boot-starter-web
spring-boot-starter-test
mysql-connector-java
jackson-core
jackson-databind
jackson-datatype-joda
jackson-module-parameter-names
pagehelper-spring-boot-starter
druid-spring-boot-starter
spring-boot-maven-plugin
mybatis-generator-maven-plugin
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7.项目不使用application.properties文件 而使用更加简洁的application.yml文件:
将原有的resource文件夹下的application.properties文件删除,创建一个新的application.yml配置文件,
文件的内容如下:
server:
port: 8080
spring:
datasource:
name: test
url: jdbc:mysql://127.0.0.1:3306/depot
username: root
password: root
# 使用druid数据源
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
filters: stat
maxActive: 20
initialSize: 1
maxWait: 60000
minIdle: 1
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: select ‘x‘
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
maxOpenPreparedStatements: 20
## 该配置节点为独立的节点,有很多同学容易将这个配置放在spring的节点下,导致配置无法被识别
mybatis:
mapper-locations: classpath:mapping/*.xml #注意:一定要对应mapper映射xml文件的所在路径
type-aliases-package: com.winter.model # 注意:对应实体类的路径
#pagehelper分页插件
pagehelper:
helperDialect: mysql
reasonable: true
supportMethodsArguments: true
params: count=countSql
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8.创建数据库:
CREATE DATABASE mytest;
CREATE TABLE t_user(
user_id INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
user_name VARCHAR(255) NOT NULL ,
password VARCHAR(255) NOT NULL ,
phone VARCHAR(255) NOT NULL
) ENGINE=INNODB AUTO_INCREMENT=1000 DEFAULT CHARSET=utf8;
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9.使用mybatis generator 自动生成代码:
配置pom.xml中generator 插件所对应的配置文件 ${basedir}/src/main/resources/generator/generatorConfig.xml
br> PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
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点击run-Edit Configurations
添加配置
运行
注意!!!同一张表一定不要运行多次,因为mapper的映射文件中会生成多次的代码,导致报错,切记
最后生成的文件以及结构:
10. 生成的文件
UserMapper.java
package com.winter.mapper;
import com.winter.model.User;
public interface UserMapper {
int deleteByPrimaryKey(Integer userId);
int insert(User record);
int insertSelective(User record);
User selectByPrimaryKey(Integer userId);
int updateByPrimaryKeySelective(User record);
int updateByPrimaryKey(User record);
//这个方式我自己加的
List
}
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User.java
package com.winter.model;
public class User {
private Integer userId;
private String userName;
private String password;
private String phone;
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 getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone == null ? null : phone.trim();
}
}
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对于sql语句这种黄色的背景,真心是看不下去了(解决方案):
**UserMapper.xml **
user_id, user_name, password, phone
delete from t_user
where user_id = #{userId,jdbcType=INTEGER}
insert into t_user (user_id, user_name, password,
phone)
values (#{userId,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},
#{phone,jdbcType=VARCHAR})
insert into t_user
user_id,
user_name,
password,
phone,
#{userId,jdbcType=INTEGER},
#{userName,jdbcType=VARCHAR},
#{password,jdbcType=VARCHAR},
#{phone,jdbcType=VARCHAR},
update t_user
user_name = #{userName,jdbcType=VARCHAR},
password = #{password,jdbcType=VARCHAR},
phone = #{phone,jdbcType=VARCHAR},
where user_id = #{userId,jdbcType=INTEGER}
update t_user
set user_name = #{userName,jdbcType=VARCHAR},
password = #{password,jdbcType=VARCHAR},
phone = #{phone,jdbcType=VARCHAR}
where user_id = #{userId,jdbcType=INTEGER}
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11.打开类SpringbootMybatisDemoApplication.java,这个是springboot的启动类。我们需要添加点东西:
package com.winter;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.winter.mapper")//将项目中对应的mapper类的路径加进来就可以了
public class SpringbootMybatisDemoApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootMybatisDemoApplication.class, args);
}
}
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注意:@MapperScan("com.winter.mapper")这个注解非常的关键,这个对应了项目中mapper(dao)所对应的包路径,很多同学就是这里忘了加导致异常的
12.到这里所有的搭建工作都完成了,接下来就是测试的工作,没使用junit4进行测试:
首先看一下完成之后的文件的结构:
现在controller,service层的代码都写好:
UserController.java
package com.winter.Controller;
import com.winter.model.User;
import com.winter.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
/**
* Created by Administrator on 2017/8/16.
*/
@Controller
@RequestMapping(value = "/user")
public class UserController {
@Autowired
private UserService userService;
@ResponseBody
@RequestMapping(value = "/add", produces = {"application/json;charset=UTF-8"})
public int addUser(User user){
return userService.addUser(user);
}
@ResponseBody
@RequestMapping(value = "/all/{pageNum}/{pageSize}", produces = {"application/json;charset=UTF-8"})
public Object findAllUser(@PathVariable("pageNum") int pageNum, @PathVariable("pageSize") int pageSize){
return userService.findAllUser(pageNum,pageSize);
}
}
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UserService.java
package com.winter.service;
import com.winter.model.User;
import java.util.List;
/**
* Created by Administrator on 2017/8/16.
*/
public interface UserService {
int addUser(User user);
List
}
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UserServiceImpl.java
package com.winter.service.impl;
import com.github.pagehelper.PageHelper;
import com.winter.mapper.UserMapper;
import com.winter.model.User;
import com.winter.service.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 UserMapper userMapper;//这里会报错,但是并不会影响
@Override
public int addUser(User user) {
return userMapper.insertSelective(user);
}
/*
* 这个方法中用到了我们开头配置依赖的分页插件pagehelper
* 很简单,只需要在service层传入参数,然后将参数传递给一个插件的一个静态方法即可;
* pageNum 开始页数
* pageSize 每页显示的数据条数
* */
@Override
public List
//将参数传给这个方法就可以实现物理分页了,非常简单。
PageHelper.startPage(pageNum, pageSize);
return userMapper.selectAllUser();
}
}
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如果强迫症看不下去那个报错:(解决方法)
测试我使用了idea一个很用心的功能。
可以发http请求的插件:
点击左侧的运行按钮就可以发送请求了;
如果返回值正确 说明你已经搭建成功了!!
Spring boot Mybatis 整合(完整版)
标签:方法 filter charset ack enable dstat actor sub produce
原文地址:https://www.cnblogs.com/cpjl456/p/14729217.html