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springboot2结合mybatis实现增删改查的功能

发布时间:2021-09-13 18:51:56 来源:亿速云 阅读:158 作者:chen 栏目:编程语言

本篇内容主要讲解“springboot2结合mybatis实现增删改查的功能”,感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷,实用性强。下面就让小编来带大家学习“springboot2结合mybatis实现增删改查的功能”吧!

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/> <!-- lookup parent from repository --> </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>  <!--1.web启动包 软件老王-->  <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>  <!--2. 数据库 软件老王-->  <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>  <!--3. swagger 软件老王-->  <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>  <!--4.mybatis 软件老王-->  <!--mybatis-->  <dependency>  <groupId>org.mybatis.spring.boot</groupId>  <artifactId>mybatis-spring-boot-starter</artifactId>  <version>2.1.0</version> </dependency> </dependencies>  <!--5.打包 软件老王--> <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%2B8spring.datasource.username=rootspring.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">  <!--<plugin type="org.mybatis.generator.plugins.ExamplePagePlugin"/>-->  <!--<plugin type="org.mybatis.generator.plugins.SerializablePlugin"/>-->  <commentGenerator>   <!-- 是否去除自动生成的注释 true:是 : false:否 -->   <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;@Servicepublic 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;

到此,相信大家对“springboot2结合mybatis实现增删改查的功能”有了更深的了解,不妨来实际操作一番吧!这里是亿速云网站,更多相关内容可以进入相关频道进行查询,关注我们,继续学习!

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