package com.zsl.service.impl;
import com.zsl.mapper.UserMapper;
import com.zsl.pojo.User;
import com.zsl.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;//报错不影响
/*
* 增加/修改用户
* */
@Override
public String insertUser(User user) {
//增加用户
if(user.getUserId() == null){
Integer i = userMapper.insert(user);
if(i != 0 && i != null){
return "success";
}
}
return null;
}
@Override
public List<User> selectAllUser() {
//PageHelper.startPage(1, 3);
List<User> list = userMapper.selectAllUser();
return list;
}
}
我们这一一篇博客讲的是如何整合Springboot和Mybatis框架,然后使用generator自动生成mapper,pojo等文件。然后再使用阿里巴巴提供的开源连接池druid,这个连接池的好处我就不说了,集合了所有连接池的好处,并且还提供了监控等功能,加大了可扩展性等等。
1. 创建一个springboot项目:
2.可以看到的是我们除了引入web依赖之外还引入了三个依赖,分别是MySQL,JDBC,Mybatis,我们如下观看一下完整的依赖情况:
<?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.example</groupId>
<artifactId>springboot-mybatis02</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>springboot-mybatis02</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-jdbc</artifactId>
</dependency>
<!--web依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--这个依赖已经包括JDBC依赖-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<!--数据库连接-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!--需要手动添加的依赖-->
<!--使用durid连接池的依赖-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.1</version>
</dependency>
<!--热部署依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
<!--thymeleaf依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<!-- 分页插件 -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>4.1.6</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<!-- mybatis generator 自动生成代码插件 -->
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
<configuration>
<configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
<overwrite>true</overwrite>
<verbose>true</verbose>
</configuration>
</plugin>
</plugins>
</build>
</project>
3.依赖引入完成以后我们再对application.properties配置文件进行编辑:
#设置访问端口
server.port=80
#thymeleaf配置,这里是可以省略的,因为默认配置已经足够
#关闭缓存,及时刷新页面,这一点很重要
spring.thymeleaf.cache=false
#注释的部分是Thymeleaf默认的配置,如有其它需求可以自行更改
#spring.thymeleaf.prefix=classpath:/templates/
#spring.thymeleaf.suffix=.html
#spring.thymeleaf.mode=HTML5
#spring.thymeleaf.encoding=UTF-8
#spring.thymeleaf.servlet.content-type=text/html
#设置热部署
#开启热部署
spring.devtools.restart.enabled=true
#重启范围
spring.devtools.restart.additional-paths=src/main/java
#设置数据源
#数据库连接用户名
spring.datasource.username=root
#数据库连接密码
spring.datasource.password=123
#驱动
spring.datasource.driver-class-name= com.mysql.jdbc.Driver
#数据库连接路径
spring.datasource.url=jdbc:mysql://localhost:3306/bysj
#连接池类型
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
#连接池配置,因为springboot默认是开启了连接池的,它有默认配置,这一段可以忽略
# 初始化大小,最小,最大
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
# 配置获取连接等待超时的时间
spring.datasource.maxWait=60000
# 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒
spring.datasource.timeBetweenEvictionRunsMillis=60000
# 配置一个连接在池中最小生存的时间,单位是毫秒
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 打开PSCache,并且指定每个连接上PSCache的大小
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 配置监控统计拦截的filters,去掉后监控界面sql无法统计,'wall'用于防火墙
spring.datasource.filters=stat,wall,log4j
# 通过connectProperties属性来打开mergeSql功能;慢SQL记录
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
#配置mybatis
mybatis.mapper-location=classpath:mapping/*.xml
#全局的映射,不用在xml文件写实体类的全路径
mybatis.type-aliases-package=com.zsl.pojo
#开启驼峰映射
mybatis.configuration.map-underscore-to-camel-case=true
#配置分页插件
#pagehelper分页插件
pagehelper.helper-dialect=mysql
pagehelper.reasonable=true
pagehelper.support-methods-arguments=true
pagehelper.params=count=countSql
4. 配置generator自动生成代码:文件放置的位置就在pom.xml文件里面一如插件的位置${basedir}/src/main/resources/generator/generatorConfig.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包-->
<classPathEntry location="C:\mysql-connector-java-5.1.41.jar"/>
<context id="DB2Tables" targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressDate" value="true"/>
<!-- 是否去除自动生成的注释 true:是 : false:否 -->
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--数据库链接URL,用户名、密码 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost/bysj" userId="root" password="123">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- 生成模型的包名和位置-->
<javaModelGenerator targetPackage="com.zsl.pojo" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!-- 生成映射文件的包名和位置-->
<sqlMapGenerator targetPackage="mapping" targetProject="src/main/resources">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!-- 生成DAO的包名和位置-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.zsl.mapper" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
<table tableName="user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
</context>
</generatorConfiguration>
5.创建数据库以及表格
CREATE DATABASE bysj;
CREATE TABLE 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;
6. 操作IDEA生成代码:Run-->Edit Configurations
回到下图所示页面的时候点击三角即可:
7.查看项目情况以及生成代码:
7.2:生成的pojo实体类:
7.3生成的mapper的xml文件:在这里务必要注意namespace是否正确,请注意查看这一点
<?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.zsl.mapper.UserMapper" >
<resultMap id="BaseResultMap" type="com.zsl.pojo.User" >
<id column="user_id" property="userId" jdbcType="INTEGER" />
<result column="user_name" property="userName" jdbcType="VARCHAR" />
<result column="password" property="password" jdbcType="VARCHAR" />
<result column="phone" property="phone" jdbcType="VARCHAR" />
</resultMap>
<sql id="Base_Column_List" >
user_id, user_name, password, phone
</sql>
<!--自己写的-->
<select id="selectAllUser" resultType="user">
select
<include refid="Base_Column_List" />
from user;
</select>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
select
<include refid="Base_Column_List" />
from user
where user_id = #{userId,jdbcType=INTEGER}
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
delete from user
where user_id = #{userId,jdbcType=INTEGER}
</delete>
<insert id="insert" parameterType="com.zsl.pojo.User" >
insert into user (user_id, user_name, password,
phone)
values (#{userId,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},
#{phone,jdbcType=VARCHAR})
</insert>
<insert id="insertSelective" parameterType="com.zsl.pojo.User" >
insert into user
<trim prefix="(" suffix=")" suffixOverrides="," >
<if test="userId != null" >
user_id,
</if>
<if test="userName != null" >
user_name,
</if>
<if test="password != null" >
password,
</if>
<if test="phone != null" >
phone,
</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="password != null" >
#{password,jdbcType=VARCHAR},
</if>
<if test="phone != null" >
#{phone,jdbcType=VARCHAR},
</if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="com.zsl.pojo.User" >
update user
<set >
<if test="userName != null" >
user_name = #{userName,jdbcType=VARCHAR},
</if>
<if test="password != null" >
password = #{password,jdbcType=VARCHAR},
</if>
<if test="phone != null" >
phone = #{phone,jdbcType=VARCHAR},
</if>
</set>
where user_id = #{userId,jdbcType=INTEGER}
</update>
<update id="updateByPrimaryKey" parameterType="com.zsl.pojo.User" >
update user
set user_name = #{userName,jdbcType=VARCHAR},
password = #{password,jdbcType=VARCHAR},
phone = #{phone,jdbcType=VARCHAR}
where user_id = #{userId,jdbcType=INTEGER}
</update>
</mapper>
7.4项目的总体结构:
7.5 自己用于测试分页,驼峰映射,实体类映射等配置的controller,service
package com.zsl.controller;
import com.zsl.pojo.User;
import com.zsl.service.impl.UserServiceImpl;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import javax.annotation.Resource;
import java.util.List;
@Controller
public class Userontroller {
@Resource
private UserServiceImpl userService;
//增加用户
@ResponseBody
@RequestMapping("/insertUser")
public String insertUser(User user){
return userService.insertUser(user);
}
//查询所有的用户
@ResponseBody
@RequestMapping("/selectAllUser")
public String getAllUser(){
List<User> list = userService.selectAllUser();
System.out.println(list.size());
System.out.println(list);
System.out.println(list.get(1).getUserId());
return null;
}
}
注意:在实验的时候务必要在启动类上加上MapperScna注解,指定扫描mapper文件,或者可以在每个mapper文件上加mapper注解,不过这样太麻烦了:
加依赖
<dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.0.1</version> </dependency>
mapper继承即可,相当于通用mapper不需要任何配置爽!