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spring boot2结合mybatis增删改查的实现

作者：软件老王　　发布时间：2023-07-07 01:17:31　

标签：springboot2,mybatis,增删改查

1. 场景描述

本节结合springboot2、springmvc、mybatis、swagger2等，搭建一个完整的增删改查项目，希望通过这个基础项目，能帮忙朋友快速上手springboot2项目。

2. 解决方案

2.1新建springboot项目

使用idea新建springboot项目（springboot项目快速搭建）

（1）new project

（2）gav设置

2.2 项目整体图及说明2.2.1 整体图

2.2.2 说明

项目包含4大内容

（1）pom.xml

maven项目必备，用于定义项目、获取jar包、打包等。

（2）项目配置文件

有两个，一个是项目内配置文件；一个是用于mybatis-generate生成相关数据库操作文件。

（3）spcrudapplication

项目启动类，springboot项目必备。

（4）springmvc对应类。

包含controller、service、db等相关类。

2.3 详细说明

2.3.1 pom文件

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.7.RELEASE</version>
<relativePath/> 
</parent>
<groupId>com.laowang</groupId>
<artifactId>spcrud</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spcrud</name>
<description>Demo project for Spring Boot</description>

<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>


<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.15</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
<version>2.1.5.RELEASE</version>
</dependency>


<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.7.0</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.7.0</version>
</dependency>


<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.0</version>
</dependency>

</dependencies>


<build>
<resources>
<resource>
<directory>src/main/resources/</directory>
</resource>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>

<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.5</version>
<configuration>
<configurationFile>src/main/resources/generatorConfig.xml</configurationFile>
<verbose>true</verbose>
<overwrite>true</overwrite>
</configuration>
</plugin>
</plugins>
</build>

</project>

说明：

包含5块内容

（1）web启动包；

（2）数据库；

（3）swagger；

（4）mybatis；

（5）打包；

2.3.2 资源文件

（1）application.properties

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/ruanjianlaowang?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT％2B8
spring.datasource.username=root
spring.datasource.password=root

说明：数据库配置文件，连接、用户名、密码

（2）mybatis资源文件

<?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>
<classPathEntry
location="E:\m2\repository\mysql\mysql-connector-java\5.1.46\mysql-connector-java-5.1.46.jar"/>
<context id="DB2Tables" targetRuntime="MyBatis3">


<commentGenerator>

<property name="suppressAllComments" value="true"/>
</commentGenerator>

<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://127.0.0.1:3306/ruanjianlaowang"
userId="root"
password="root">
</jdbcConnection>

<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<javaModelGenerator targetPackage="com.laowang.spcrud.db.entity" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<sqlMapGenerator targetPackage="com.laowang.spcrud.db.mapper" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<javaClientGenerator type="XMLMAPPER" targetPackage="com.laowang.spcrud.db.mapper" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>

<table tableName="t_laowang" domainObjectName="TLaowang" enableInsert="true"
enableDeleteByPrimaryKey="true"
enableSelectByPrimaryKey="true"
enableUpdateByPrimaryKey="true"
enableCountByExample="false"
enableDeleteByExample="false"
enableSelectByExample="false"
enableUpdateByExample="false">
<property name="useActualColumnNames" value="false"/>
<generatedKey column="id" sqlStatement="MYSQL" identity="true"/>
</table>

</context>
</generatorConfiguration>

说明：

包含几块内容：

（a）classPathEntry 标签定义的是mysql-connector的jar包地址

（b）jdbcConnection 数据库连接信息

（c）javaModelGenerator、sqlMapGenerator、javaClientGenerator定义的是生成文件存放的地址；

（d）table具体执行生成代码的tabel，增加几个标签，不生成example方法。

2.3.3 启动类

package com.laowang.spcrud;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@SpringBootApplication
@EnableSwagger2
@MapperScan("com.laowang.spcrud.db.mapper")
public class SpcrudApplication {

public static void main(String[] args) {
SpringApplication.run(SpcrudApplication.class, args);
}

}

说明：

@SpringBootApplication所有springboot项目启动必备

@EnableSwagger2 启动swagger

@MapperScan加载mpper文件。

2.3.4 springmvc类

（1）TestController

package com.laowang.spcrud;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@SpringBootApplication
@EnableSwagger2
@MapperScan("com.laowang.spcrud.db.mapper")
public class SpcrudApplication {

public static void main(String[] args) {
SpringApplication.run(SpcrudApplication.class, args);
}

}

ctroller类包含增删改查4个方法，使用了rest请求的方式。

（2）TestService

package com.laowang.spcrud.service;

import com.laowang.spcrud.db.entity.TLaowang;
import com.laowang.spcrud.db.mapper.TLaowangMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class TestService {
@Autowired
private TLaowangMapper tLaowangMapper;

/**
* 增加
* @auther: 软件老王
*/
public void insertRecord(TLaowang tLaowang) {
tLaowangMapper.insert(tLaowang);
}

/**
* 删除
* @auther: 软件老王
*/
public void deleteByPrimaryKey(int id) {
tLaowangMapper.deleteByPrimaryKey(id);
}
/**
* 更新
* @auther: 软件老王
*/
public void updateByPrimaryKeySelective(TLaowang tLaowang) {
tLaowangMapper.updateByPrimaryKeySelective(tLaowang);
}

/**
* 查询
* @auther: 软件老王
*/
public TLaowang selectByPrimaryKey(int id) {
return tLaowangMapper.selectByPrimaryKey(id);
}
}

TestService类，增删改查的服务类。

（3）实体类TLaowang

package com.laowang.spcrud.db.entity;

public class TLaowang {
private Integer id;

private String name;

private String password;

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name == null ? null : name.trim();
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}
}

操作实体类，包含三个字段：id、name、password

（4）mpper接口类TLaowangMapper

package com.laowang.spcrud.db.mapper;

import com.laowang.spcrud.db.entity.TLaowang;

public interface TLaowangMapper {
int deleteByPrimaryKey(Integer id);

int insert(TLaowang record);

int insertSelective(TLaowang record);

TLaowang selectByPrimaryKey(Integer id);

int updateByPrimaryKeySelective(TLaowang record);

int updateByPrimaryKey(TLaowang record);
}

（5）mapper接口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.laowang.spcrud.db.mapper.TLaowangMapper">
<resultMap id="BaseResultMap" type="com.laowang.spcrud.db.entity.TLaowang">
<id column="id" jdbcType="INTEGER" property="id" />
<result column="name" jdbcType="VARCHAR" property="name" />
<result column="password" jdbcType="VARCHAR" property="password" />
</resultMap>
<sql id="Base_Column_List">
id, name, password
</sql>
<select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
select
<include refid="Base_Column_List" />
from t_laowang
where id = #{id,jdbcType=INTEGER}
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
delete from t_laowang
where id = #{id,jdbcType=INTEGER}
</delete>
<insert id="insert" parameterType="com.laowang.spcrud.db.entity.TLaowang">
<selectKey keyProperty="id" order="AFTER" resultType="java.lang.Integer">
SELECT LAST_INSERT_ID()
</selectKey>
insert into t_laowang (name, password)
values (#{name,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR})
</insert>
<insert id="insertSelective" parameterType="com.laowang.spcrud.db.entity.TLaowang">
<selectKey keyProperty="id" order="AFTER" resultType="java.lang.Integer">
SELECT LAST_INSERT_ID()
</selectKey>
insert into t_laowang
<trim prefix="(" suffix=")" suffixOverrides=",">
<if test="name != null">
name,
</if>
<if test="password != null">
password,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides=",">
<if test="name != null">
#{name,jdbcType=VARCHAR},
</if>
<if test="password != null">
#{password,jdbcType=VARCHAR},
</if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="com.laowang.spcrud.db.entity.TLaowang">
update t_laowang
<set>
<if test="name != null">
name = #{name,jdbcType=VARCHAR},
</if>
<if test="password != null">
password = #{password,jdbcType=VARCHAR},
</if>
</set>
where id = #{id,jdbcType=INTEGER}
</update>
<update id="updateByPrimaryKey" parameterType="com.laowang.spcrud.db.entity.TLaowang">
update t_laowang
set name = #{name,jdbcType=VARCHAR},
password = #{password,jdbcType=VARCHAR}
where id = #{id,jdbcType=INTEGER}
</update>
</mapper>

4与5在一起，这里使用了mybatis自动生成的增删改查方法，未做扩展，真实项目中除了这几个外，肯定还会做些扩展，比如根据name查询等。

2.4 数据库建表语句

CREATE TABLE `t_laowang` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(50) DEFAULT NULL,
`password` varchar(50) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

2.5 swagger效果

http://localhost:8080/swagger-ui.html

完整的代码，完整的注释，希望对你有帮助。

来源：https://www.cnblogs.com/ruanjianlaowang/p/11497754.html

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spring boot2结合mybatis增删改查的实现

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