spring boot整合mybatis方式二

方式二：

pom文件导入maven依赖：

        <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>
        </dependency>
        
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.6</version>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.0</version>
        </dependency>

jdbc.properties：

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://192.168.43.212:3306/houses?characterEncoding=UTF-8
jdbc.username=root
jdbc.password=root

DruidConfig配置类（上一次采用的@ConfigurationProperties注解直接注入，这次采用@PropertySource注解）：

@Configuration
@PropertySource(value = {"classpath:jdbc.properties"})//也可以使用@ConfigurationProperties直接注入属性
public class DataSourceConfig {
    @Value("${jdbc.url}")
    private String jdbcUrl;
 
    @Value("${jdbc.driverClassName}")
    private String jdbcDriverClassName;
 
    @Value("${jdbc.username}")
    private String jdbcUsername;
 
    @Value("${jdbc.password}")
    private String jdbcPassword;
 
    /**
     * 配置数据库
     * @return
     */
    @Bean(name = "dataSource")
    public DataSource dataSource(){
        DruidDataSource datasource = new DruidDataSource();
        // 数据库驱动
        datasource.setDriverClassName(jdbcDriverClassName);
        // 相应驱动的jdbcUrl
        datasource.setUrl(jdbcUrl);
        // 数据库的用户名
        datasource.setUsername(jdbcUsername);
        // 数据库的密码
        datasource.setPassword(jdbcPassword);
        // 每个分区最大的连接数
        datasource.setMaxActive(20);
        // 每个分区最小的连接数
        datasource.setMinIdle(5);
        return datasource;
       
    }
 
}

配置mapperscanner配置类：

@Configuration
@AutoConfigureAfter(MyBatisConfig.class)
public class MapperScannerConfig {
    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer() {
        MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
        mapperScannerConfigurer.setSqlSessionFactoryBeanName("sqlSessionFactory");
        mapperScannerConfigurer.setBasePackage("com.sun.houses.mapper");
        return mapperScannerConfigurer;
    }
 
}

MyBatis核心配置类（主要配置sqlsessionFactory）:

@Configuration
public class MyBatisConfig {
    @Autowired
    private DataSource dataSource;
    
    @Bean(name="sqlSessionFactory")
    @ConditionalOnMissingBean //当容器里没有指定的Bean的情况下创建该对象
    public SqlSessionFactory sqlSessionFactory() {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        try {
            // 设置数据源
            sqlSessionFactoryBean.setDataSource(dataSource);
            // 设置mybatis的主配置文件
            ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
            Resource mybatisConfigXml = resolver.getResource("classpath:mybatis/mybatis-config.xml");
            sqlSessionFactoryBean.setConfigLocation(mybatisConfigXml);
            
          //设置mybatis扫描的mapper.xml文件的路径（非常重要，否则找不到mapper.xml文件）
            Resource[] mapperResources = resolver.getResources("classpath:mybatis/mapper/*.xml");
            sqlSessionFactoryBean.setMapperLocations(mapperResources);
            // 设置别名包，便于在mapper.xml文件中ParemeType和resultType不要写完整的包
           
            sqlSessionFactoryBean.setTypeAliasesPackage("com.sun.houses.model");
            return sqlSessionFactoryBean.getObject();
        }catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
            throw  new RuntimeException();
        }
         
    }
 
}

mapper-config.xml文件放在resources下的mybatis下（配置mybatis的其他信息等）：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        
        <setting name="mapUnderscoreToCamelCase" value="true" />
        <setting name="cacheEnabled" value="true" /><!-- 全局映射器启用缓存 -->
        <setting name="useGeneratedKeys" value="true" />
        <setting name="defaultExecutorType" value="REUSE" />
        
    </settings>
</configuration>