springboot2結(jié)合mybatis實(shí)現(xiàn)增刪改查的功能

本篇內(nèi)容主要講解“springboot2結(jié)合mybatis實(shí)現(xiàn)增刪改查的功能”，感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷，實(shí)用性強(qiáng)。下面就讓小編來帶大家學(xué)習(xí)“springboot2結(jié)合mybatis實(shí)現(xiàn)增刪改查的功能”吧!

1. 場(chǎng)景描述

本節(jié)結(jié)合springboot2、springmvc、mybatis、swagger2等，搭建一個(gè)完整的增刪改查項(xiàng)目，希望通過這個(gè)基礎(chǔ)項(xiàng)目，能幫忙朋友快速上手springboot2項(xiàng)目。

2. 解決方案

2.1新建springboot項(xiàng)目

使用idea新建springboot項(xiàng)目（springboot項(xiàng)目快速搭建）

（1）new project

（2）gav設(shè)置

2.2 項(xiàng)目整體圖及說明2.2.1 整體圖

2.2.2 說明

項(xiàng)目包含4大內(nèi)容

（1）pom.xml

maven項(xiàng)目必備，用于定義項(xiàng)目、獲取jar包、打包等。

（2）項(xiàng)目配置文件

有兩個(gè)，一個(gè)是項(xiàng)目內(nèi)配置文件；一個(gè)是用于mybatis-generate生成相關(guān)數(shù)據(jù)庫操作文件。

（3）spcrudapplication

項(xiàng)目啟動(dòng)類，springboot項(xiàng)目必備。

（4）springmvc對(duì)應(yīng)類。

包含controller、service、db等相關(guān)類。

2.3 詳細(xì)說明

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啟動(dòng)包 軟件老王-->  <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. 數(shù)據(jù)庫 軟件老王-->  <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 軟件老王-->  <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 軟件老王-->  <!--mybatis-->  <dependency>  <groupId>org.mybatis.spring.boot</groupId>  <artifactId>mybatis-spring-boot-starter</artifactId>  <version>2.1.0</version> </dependency> </dependencies>  <!--5.打包 軟件老王--> <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>

說明：

包含5塊內(nèi)容

（1）web啟動(dòng)包 ；

（2）數(shù)據(jù)庫 ；

（3）swagger；

（4）mybatis；

（5）打包；

2.3.2 資源文件

（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

說明： 數(shù)據(jù)庫配置文件，連接、用戶名、密碼

（2）mybatis資源文件

<?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>   <!-- 是否去除自動(dòng)生成的注釋 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>

說明：

包含幾塊內(nèi)容：

（a）classPathEntry 標(biāo)簽定義的是mysql-connector的jar包地址

（b）jdbcConnection 數(shù)據(jù)庫連接信息

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

（d）table具體執(zhí)行生成代碼的tabel，增加幾個(gè)標(biāo)簽，不生成example方法。

2.3.3 啟動(dòng)類

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); }}

說明：

@SpringBootApplication所有springboot項(xiàng)目啟動(dòng)必備

@EnableSwagger2 啟動(dòng)swagger

@MapperScan加載mpper文件。

2.3.4 springmvc類

（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類包含增刪改查4個(gè)方法，使用了rest請(qǐng)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: 軟件老王  */ public void insertRecord(TLaowang tLaowang) {  tLaowangMapper.insert(tLaowang); } /**  * 刪除  * @auther: 軟件老王  */ public void deleteByPrimaryKey(int id) {  tLaowangMapper.deleteByPrimaryKey(id); } /**  * 更新  * @auther: 軟件老王  */ public void updateByPrimaryKeySelective(TLaowang tLaowang) {  tLaowangMapper.updateByPrimaryKeySelective(tLaowang); } /**  * 查詢  * @auther: 軟件老王  */ public TLaowang selectByPrimaryKey(int id) {  return tLaowangMapper.selectByPrimaryKey(id); }}

TestService類，增刪改查的服務(wù)類。

（3）實(shí)體類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(); }}

操作實(shí)體類，包含三個(gè)字段：id、name、password

（4）mpper接口類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與5在一起，這里使用了mybatis自動(dòng)生成的增刪改查方法，未做擴(kuò)展，真實(shí)項(xiàng)目中除了這幾個(gè)外，肯定還會(huì)做些擴(kuò)展，比如根據(jù)name查詢等。

2.4 數(shù)據(jù)庫建表語句

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;

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