spring-boot-SpringBoot与数据访问

1.JDBC

(1).导入依赖

<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>

(2).application.yml

spring:
datasource:
username: root
password: 123456
url: jdbc:mysql://192.168.15.22:3306/jdbc

 效果：

 默认是org.apache.tomcat.jdbc.pool.DataSource作为数据源

数据源的相关配置都在DataSourceProperties里面

3).自动配置原理：

 在org.springframework.boot.autoconfigure.jdbc查看

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指定自定义的数据类型；

	@ConditionalOnClass(org.apache.tomcat.jdbc.pool.DataSource.class)
@ConditionalOnProperty(name = "spring.datasource.type", havingValue = "org.apache.tomcat.jdbc.pool.DataSource", matchIfMissing = true)
static class Tomcat extends DataSourceConfiguration {
@Bean
@ConfigurationProperties(prefix = "spring.datasource.tomcat")

2.SpringBoot默认可以支持

org.apache.tomcat.jdbc.pool.DataSource、HikariDataSource、BasicDataSource

3.自定义数据类型(查看源码)

/**
* Generic DataSource configuration.
*/
@ConditionalOnMissingBean(DataSource.class) @ConditionalOnProperty(name="spring.datasource.type") staticclassGeneric{
@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：

   a.run SchemaScripts();运行建表语句

   b.run SchemaScripts();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

2.整合Druid数据源

  （1）导入依赖

<!--引入druid数据源-->
<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.8</version>
</dependency>

   2）applicaton.yml

spring:
datasource:
username: root
password: 123456
url: jdbc:mysql://192.168.15.22:3306/jdbc
driver-class-name: com.mysql.jdbc.Driver
type: com.alibaba.druid.pool.DruidDataSource
initialSize: 5
minIdle: 5
maxActive: 20
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
#
配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
filters: stat,wall,log4j
maxPoolPreparedStatementPerConnectionSize: 20
useGlobalDataSourceStat: true
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
#
schema:
#
- classpath:department.sql

3).导入数据源

//读取配置文件中Druid的值
@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

  (1)导入依赖

<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis‐spring‐boot‐starter</artifactId>
<version>1.3.1</version>
</dependency

  步骤：

   a.配置数据源相关属性（见上一节）

   b.给数据库建表

   c.创建javaBean(此处不添代码了)

   (2)注解版

//指定这是一个操作数据库的mapper 2 @Mapper
publicinterfaceDepartmentMapper{
@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);
}

  问题：

  自定义Mybatis的配置规则；给容器中添加一个ConfigurationCustomizer(开启驼峰命名 例如 数据库字段是last_name javaBean

  可以是lastName)

@org.springframework.context.annotation.Configuration publicclass
MyBatisConfig{
@Bean
public ConfigurationCustomizer configurationCustomizer(){
return new ConfigurationCustomizer(){
@Override
public void customize(Configuration configuration) {
configuration.setMapUnderscoreToCamelCase(true);
}
};
}
}

  springbootApplication

package com.atguigu.springboot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
使用MapperScan扫描所有的mapper接口，可以省去每个mapper接口加@Mapper
@MapperScan(value="com.hbsi.mapper")
@SpringBootApplication
public class SpringBoot06DataJdbcApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBoot06DataJdbcApplication.class, args);
}
}

(3)配置文件版（此处不做详解，只标明如何扫描配置文件）

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/

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