1、JDBC
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
spring:
datasource:
username: root
password: 123456
url: jdbc:mysql://192.168.15.22:3306/jdbc
driver-class-name: com.mysql.jdbc.Driver
效果:
- 默认是用org.apache.tomcat.jdbc.pool.DataSource作为数据源;
- 数据源的相关配置都在DataSourceProperties里面;
自动配置原理:
org.springframework.boot.autoconfigure.jdbc:
- 参考DataSourceConfiguration,根据配置创建数据源,默认使用Tomcat连接池;可以使用spring.datasource.type指定自定义的数据源类型;
- SpringBoot默认可以支持;
org.apache.tomcat.jdbc.pool.DataSource、HikariDataSource、BasicDataSource
- 自定义数据源类型
/** * Generic DataSource configuration. */ @ConditionalOnMissingBean(DataSource.class) @ConditionalOnProperty(name = "spring.datasource.type") static class Generic { @Bean public DataSource dataSource(DataSourceProperties properties) { //使用DataSourceBuilder创建数据源,利用反射创建响应type的数据源,并且绑定相关属性 return properties.initializeDataSourceBuilder().build(); } }
- DataSourceInitializer:ApplicationListener;
作用:
- runSchemaScripts();运行建表语句;
- runDataScripts();运行插入数据的SQL语句; 默认只需要将文件命名为:
schema-*.sql、data-*.sql 默认规则:schema.sql,schema-all.sql; 可以使用 schema: - classpath:department.sql 指定位置
- 操作数据库:自动配置了JdbcTemplate操作数据库
2、整合Druid数据源
导入druid数据源
@Configuration
public class DruidConfig {
@ConfigurationProperties(prefix = "spring.datasource")
@Bean
public DataSource druid(){
return new DruidDataSource();
}
//配置Druid的监控
//1、配置一个管理后台的Servlet
@Bean
public ServletRegistrationBean statViewServlet(){
ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
Map<String,String> initParams = new HashMap<>();
initParams.put("loginUsername","admin");
initParams.put("loginPassword","123456");
initParams.put("allow","");//默认就是允许所有访问
initParams.put("deny","192.168.15.21");
bean.setInitParameters(initParams);
return bean;
}
//2、配置一个web监控的filter
@Bean
public FilterRegistrationBean webStatFilter(){
FilterRegistrationBean bean = new FilterRegistrationBean();
bean.setFilter(new WebStatFilter());
Map<String,String> initParams = new HashMap<>();
initParams.put("exclusions","*.js,*.css,/druid/*");
bean.setInitParameters(initParams);
bean.setUrlPatterns(Arrays.asList("/*"));
return bean;
}
}
3、整合MyBatis
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.1</version>
</dependency>
步骤:
- 配置数据源相关属性(见上一节Druid)
- 给数据库建表
- 创建JavaBean
4)、注解版
//指定这是一个操作数据库的mapper
@Mapper
public interface DepartmentMapper {
@Select("select * from department where id=#{id}")
public Department getDeptById(Integer id);
@Delete("delete from department where id=#{id}")
public int deleteDeptById(Integer id);
@Options(useGeneratedKeys = true,keyProperty = "id")
@Insert("insert into department(departmentName) values(#{departmentName})")
public int insertDept(Department department);
@Update("update department set departmentName=#{departmentName} where id=#{id}")
public int updateDept(Department department);
}
自定义MyBatis的配置规则;给容器中添加一个ConfigurationCustomizer;
@org.springframework.context.annotation.Configuration
public class MyBatisConfig {
@Bean
public ConfigurationCustomizer configurationCustomizer(){
return new ConfigurationCustomizer(){
@Override
public void customize(Configuration configuration) {
configuration.setMapUnderscoreToCamelCase(true);
}
};
}
}
使用MapperScan批量扫描所有的Mapper接口;
@MapperScan(value = "com.atguigu.springboot.mapper")
@SpringBootApplication
public class SpringBoot06DataMybatisApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBoot06DataMybatisApplication.class, args);
}
}
5)、配置文件版
mybatis:
config-location: classpath:mybatis/mybatis-config.xml 指定全局配置文件的位置
mapper-locations: classpath:mybatis/mapper/*.xml 指定sql映射文件的位置
更多使用参照:http://www.mybatis.org/spring-boot-starter/mybatis-spring-boot-autoconfigure/
4、整合SpringData JPA
1)、SpringData简介
2)、整合SpringData JPA
JPA:ORM(Object Relational Mapping);
- 编写一个实体类(bean)和数据表进行映射,并且配置好映射关系;
//使用JPA注解配置映射关系 @Entity //告诉JPA这是一个实体类(和数据表映射的类) @Table(name = "tbl_user") //@Table来指定和哪个数据表对应;如果省略默认表名就是user; public class User { @Id //这是一个主键 @GeneratedValue(strategy = GenerationType.IDENTITY)//自增主键 private Integer id; @Column(name = "last_name",length = 50) //这是和数据表对应的一个列 private String lastName; @Column //省略默认列名就是属性名 private String email;
- 编写一个Dao接口来操作实体类对应的数据表(Repository)
//继承JpaRepository来完成对数据库的操作 public interface UserRepository extends JpaRepository<User,Integer> { }
- 基本的配置JpaProperties
spring: jpa: hibernate: # 更新或者创建数据表结构 ddl-auto: update # 控制台显示SQL show-sql: true