- S pring boot数据层开发
- 数据源自动 管理
引入jdbc的依赖和springboot的应用场景
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| <dependency > <groupId >org.springframework.boot</groupId > <artifactId >spring-boot-starter-jdbc</artifactId > </dependency > <dependency > <groupId >org.apache.commons</groupId > <artifactId >commons-dbcp2</artifactId > </dependency > <dependency > <groupId >mysql</groupId > <artifactId >mysql-connector-java</artifactId > <scope >runtime</scope > </dependency > |
让我们使用yaml方式配置，创建application.yaml
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| spring: datasource: username: root password: root url: jdbc:mysql://localhost:3306/boot_demo driver-class-name: com.mysql.jdbc.Driver type: com.zaxxer.hikari.HikariDataSource |
在默认情况下， 数据库连接可以使用DataSource池进行自动配置
- 如果Hikari可用， Springboot将使用它。
- 如果Commons DBCP2可用， 我们将使用它。
我们可以自己指定数据源配置，通过type来选取使用哪种数据源
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| spring: datasource: username: root password: root url: jdbc:mysql://localhost:3306/boot_demo driver-class-name: com.mysql.jdbc.Driver type: com.zaxxer.hikari.HikariDataSource # type: org.apache.commons.dbcp2.BasicDataSource |
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- 配置 druid数据源
引入druid的依赖
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| <dependency > <groupId >com.alibaba</groupId > <artifactId >druid</artifactId > <version >1.0.9</version > </dependency > <dependency > <groupId >log4j</groupId > <artifactId >log4j</artifactId > <version >1.2.15</version > </dependency > |
修改spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
在application.yaml中加入
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| spring: datasource: username: root password: root url: jdbc:mysql://localhost:3306/boot_demo 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 filters: stat,wall,log4j maxPoolPreparedStatementPerConnectionSize: 20 useGlobalDataSourceStat: true connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500 |
创建数据源注册类
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| @Configuration public class DruidConfig { @ConfigurationProperties(prefix = "spring.datasource" ) @Bean public DataSource dataSource(){ return new DruidDataSource(); } } |
配置druid运行期监控
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| @Configuration public class DruidConfig { @ConfigurationProperties(prefix = "spring.datasource" ) @Bean public DataSource dataSource(){ return new DruidDataSource(); } @Bean public ServletRegistrationBean statViewServlet(){ ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*" ); Map<String,String> initParams = new HashMap<>(); initParams.put("loginUsername" ,"root" ); initParams.put("loginPassword" ,"root" ); 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; 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; } } |
打开监控页面
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- springboot 整合 jdbcTemplate
在数据源建表
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| SET FOREIGN_KEY_CHECKS=0; -- ---------------------------- -- Table structure for tx_user -- ---------------------------- DROP TABLE IF EXISTS `tx_user`; CREATE TABLE `tx_user` ( `username` varchar(10) DEFAULT NULL, `userId` int(10) NOT NULL, `password` varchar(10) DEFAULT NULL, PRIMARY KEY (`userId`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; |
创建Controller
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| @Controller public class TestController { @Autowired JdbcTemplate jdbcTemplate ; @ResponseBody @RequestMapping("/query" ) public List<Map<String, Object>> query(){ List<Map<String, Object>> maps = jdbcTemplate .queryForList("SELECT * FROM tx_user" ); return maps; } } |
启动springboot访问
Springboot中提供了JdbcTemplateAutoConfiguration的自动配置
org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration, \
JdbcTemplateAutoConfiguration源码：
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- Springboot整合mybatis 注解版
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| <dependency > <groupId >org.mybatis.spring.boot</groupId > <artifactId >mybatis-spring-boot-starter</artifactId > <version >1.3.1</version > </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
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| public class TxPerson { private int pid ; private String pname ; private String addr ; private int gender ; private Date birth ; |
4）创建Mapper
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| @Mapper public interface TxPersonMapper { @Select("select * from tx_person" ) public List<TxPerson> getPersons(); @Select("select * from tx_person t where t.pid = #{id}" ) public TxPerson getPersonById(int id); @Options(useGeneratedKeys =true , keyProperty = "pid" ) @Insert("insert into tx_person(pid, pname, addr,gender, birth)" + " values(#{pid}, #{pname}, #{addr},#{gender}, #{birth})" ) public void insert(TxPerson person); @Delete("delete from tx_person where pid = #{id}" ) public void update(int id); } |
单元测试
解决驼峰模式和数据库中下划线不能映射的问题。
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| @Configuration public class MybatisConfig { @Bean public ConfigurationCustomizer getCustomizer(){ return new ConfigurationCustomizer() { @Override public void customize(org.apache.ibatis.session.Configuration configuration) { configuration.setMapUnderscoreToCamelCase(true ); } }; } } |
查询结果
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| TxPerson{pid=1, pname='张三', pAddr='北京', gender=1, birth=Thu Jun 14 00:00:00 CST 2018} |
我们同样可以在mybatis的接口上不加@Mapper注解，通过扫描器注解来扫描
Mapper接口存放在cn.tx.mapper下
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- S pringboot整合 mybatis配置文件
创建sqlMapConfig.xml配置文件
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| <? 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 > </configuration > |
创建映射文件PersonMapper.xml
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| <? xml version ="1.0" encoding ="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace ="cn.tx.mapper.TxPersonMapper" > <select id ="getPersons" resultType ="TxPerson" > select * from tx_person </select > </mapper > |
在application.yaml中配置mybatis的信息
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| mybatis: config-location: classpath:mybatis/sqlMapConfig.xml mapper-locations: classpath:mybatis/mapper/*.xml type-aliases-package: cn.tx.springboot.jdbc_demo1 |