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>
1 spring:
2 datasource:
3 username: root
4 password: 123456
5 url: jdbc:mysql://192.168.1.104:3306/jdbc
6 driver-class-name: com.mysql.jdbc.Driver
效果:
默认使用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：
1、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；
2、SpringBoot默认可以支持；
org.apache.tomcat.jdbc.pool.DataSource、HikariDataSource、BasicDataSource
3、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();
}
}
4、**DataSourceInitializer:**ApplicationListener
作用:
1)、runSchemaScripts();运行建表语句;
2)、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
5、操作数据库:自动配置jdbcTemplate操作数据库
2、整合Druid数据源
导入Druid数据源
1 @Configuration
2 public class DruidConfig {
3
4 @ConfigurationProperties(prefix = "spring.datasource")
5 @Bean
6 public DataSource druid(){
7 return new DruidDataSource();
8 }
9
10 //配置Druid的监控
11 //1、配置一个管理后台的Servlet
12 @Bean
13 public ServletRegistrationBean statViewServlet(){
14 ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
15 Map<String,String> initParams = new HashMap<>();
16 initParams.put("loginUsername","admin");
17 initParams.put("loginPassword","123456");
18 initParams.put("allow","");//默认允许所有访问
19 initParams.put("deny","192.168.1.102");
20 bean.setInitParameters(initParams);
21 return bean;
22 }
23
24 //2、配置一个web监控的filter
25 @Bean
26 public FilterRegistrationBean webStatFilter(){
27 FilterRegistrationBean bean = new FilterRegistrationBean();
28 bean.setFilter(new WebStatFilter());
29 Map<String,String> initParams = new HashMap<>();
30 initParams.put("exclusions","*.js,*.css,/druid/*");
31 bean.setInitParameters(initParams);
32 bean.setUrlPatterns(Arrays.asList("/*"));
33 return bean;
34 }
35
36 }
3、整合Mybatis
1 <dependency>
2 <groupId>org.mybatis.spring.boot</groupId>
3 <artifactId>mybatis-spring-boot-starter</artifactId>
4 <version>1.3.2</version>
5 </dependency>
步骤:
1)、配置数据源相关属性(见上一节Druid)
2)、给数据库建表
3)、创建JavaBean
1)、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}")
Department getDeptById(Integer id);
@Delete("delete from department where id=#{id}")
int deleteDeptById(Integer id);
@Options(useGeneratedKeys = true,keyProperty = "id")
@Insert("insert into department(departmentName) values (#{departmentName})")
int insertDept(Department department);
@Update("update department set departmentName=#{departmentName} where id=#{id}")
int updateDept(Department department);
}
问题:
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.young.springboot.mapper")
@SpringBootApplication
public class SpringBoot06DataMybatisApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBoot06DataMybatisApplication.class, args);
}
}
2)、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
4、整合SpringData JPA
1)、SpringData简介
2)、整合SpringData JPA
JPA:ORM(Object Relational Mapping)对象关系映射
1)、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
@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;
2)、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>{
}
3)、基本的配置
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
