SpringBoot2.0应用（五）：SpringBoot2.0整合MyBatis

如何整合MyBatis

1、pom依赖

        <dependency>

            <groupId>org.mybatis.spring.boot</groupId>

            <artifactId>mybatis-spring-boot-starter</artifactId>

            <version>1.3.2</version>

        </dependency>

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <scope>runtime</scope>

        </dependency>

        <!-- 分页插件 -->

        <dependency>

            <groupId>com.github.pagehelper</groupId>

            <artifactId>pagehelper-spring-boot-starter</artifactId>

            <version>1.2.5</version>

        </dependency>

        <!--mapper -->

        <dependency>

            <groupId>tk.mybatis</groupId>

            <artifactId>mapper-spring-boot-starter</artifactId>

            <version>1.1.3</version>

        </dependency>

        <!-- alibaba的druid数据库连接池 -->

        <dependency>

            <groupId>com.alibaba</groupId>

            <artifactId>druid-spring-boot-starter</artifactId>

            <version>1.1.9</version>

        </dependency>

2、添加配置

spring.datasource.name=mysql_test

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

#druid相关配置

spring.datasource.druid.filters=stat

spring.datasource.druid.driver-class-name=com.mysql.jdbc.Driver

#基本属性

spring.datasource.druid.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf8&useSSL=false

spring.datasource.druid.username=root

spring.datasource.druid.password=1234

#配置初始化大小/最小/最大

spring.datasource.druid.initial-size=1

spring.datasource.druid.min-idle=1

spring.datasource.druid.max-active=20

#获取连接等待超时时间

spring.datasource.druid.max-wait=60000

#间隔多久进行一次检测，检测需要关闭的空闲连接

spring.datasource.druid.time-between-eviction-runs-millis=60000

#一个连接在池中最小生存的时间

spring.datasource.druid.min-evictable-idle-time-millis=300000

spring.datasource.druid.validation-query=SELECT 'x'

spring.datasource.druid.test-while-idle=true

spring.datasource.druid.test-on-borrow=false

spring.datasource.druid.test-on-return=false

#打开PSCache，并指定每个连接上PSCache的大小。oracle设为true，mysql设为false。分库分表较多推荐设置为false

spring.datasource.druid.pool-prepared-statements=false

spring.datasource.druid.max-pool-prepared-statement-per-connection-size=20

#Mapper路径

mybatis.mapper-locations=classpath=mapper/*.xml

#pagehelper

pagehelper.helperDialect=mysql

pagehelper.reasonable=true

pagehelper.supportMethodsArguments=true

pagehelper.params=count=countSql

3、自动生成Mapper

添加Mybatis的自动生成插件

            <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>

                <dependencies>

                    <dependency>

                        <groupId>mysql</groupId>

                        <artifactId>mysql-connector-java</artifactId>

                        <version>${mysql.version}</version>

                    </dependency>

                    <dependency>

                        <groupId>tk.mybatis</groupId>

                        <artifactId>mapper</artifactId>

                        <version>3.4.0</version>

                    </dependency>

                </dependencies>

            </plugin>

配置Mybatis的generatorConfig

<?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>

    <properties resource="application.properties"/>

    <context id="Mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat">

        <property name="beginningDelimiter" value="`"/>

        <property name="endingDelimiter" value="`"/>

        <plugin type="tk.mybatis.mapper.generator.MapperPlugin">

            <property name="mappers" value="sample.mybatis.mapper.MyMapper"/>

        </plugin>

        <jdbcConnection connectionURL="jdbc:mysql://localhost:3306/test?useUnicode=true"

                        driverClass="com.mysql.jdbc.Driver"

                        userId="root"

                        password="1234">

        </jdbcConnection>

        <javaModelGenerator targetPackage="sample.mybatis.entity" targetProject="src/main/java">

        </javaModelGenerator>

        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources"/>

        <javaClientGenerator targetPackage="sample.mybatis.dao" targetProject="src/main/java"

                             type="XMLMAPPER"/>

        <table tableName="city">

            <!--mysql 配置-->

            <generatedKey column="id" sqlStatement="Mysql" identity="true"/>

        </table>

    </context>

</generatorConfiguration>

执行插件会自动生成实体Bean，Mapper接口和对应的xml文件。

5、写个简单的Controller触发调用

@RestController

public class CityController {

    @Autowired

    private CityMapper cityMapper;

    @GetMapping("/")

    public List<City> index() {

        PageHelper.startPage(0, 3);

        List<City> cities = this.cityMapper.selectAll();

        return cities;

    }

}

启动项目后通过PostMan访问：http://localhost:8080/

源码地址：GitHub

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