spring boot2结合mybatis增删改查的实现
作者:软件老王
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%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"> <!--<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; @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。
总结
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