一:引言:
大部分系统都涉及到数据访问,数据库包SQL(关系型数据库)和NOSQL(非关系型数据库),SQL包括:sqlserver,Oracle,Mysql;NOSQL包括:MongoDB和redis。
二:spring boot与jdbc整合
1.1 首先添加依赖
<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>
1.2 数据源配置
spring: datasource: url: jdbc:mysql://192.168.1.102:3306/jdbc username: root password: 123456 driver-class-name: com.mysql.cj.jdbc.Driver
测试类:测试:
@RunWith(SpringRunner.class) @SpringBootTest public class springbootjdbc { @Autowired DataSource dataSource; @Test public void contextLoads() throws SQLException { System.out.println("---------------"); System.out.println(dataSource.getClass()); Connection connection = dataSource.getConnection(); System.out.println("================="); System.out.println(connection); connection.close(); } }
控制台输出:
--------------- class com.zaxxer.hikari.HikariDataSource 2019-05-03 09:25:32.889 INFO 13768 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting... 2019-05-03 09:25:33.500 INFO 13768 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed. ================= [email protected] wrapping [email protected]
springboot默认的数据源就是:class com.zaxxer.hikari.HikariDataSource,数据源的相关配置都在DataSourceProperties里面;
我们也可以自己默认数据源:spring.datasource.type可以自定义。
1.3 DataSourceInitializer
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
1.4 操作数据库
springboot自动配置了JdbcTemplate操作数据库。
@Controller public class jdbc { @Autowired JdbcTemplate jdbcTemplate; @ResponseBody @RequestMapping("/h1") public Map<String, Object> selectAll() { List< Map<String, Object>> maps = jdbcTemplate.queryForList("select *from user "); System.out.println(maps.toString()); return maps.get(0); } }
控制台打印:[{id=1, name=lisi, age=12}, {id=2, name=wangwu, age=13}]
二:整合Druid数据源
1.1 导入依赖(版本可选择最新的)
<!-- https://mvnrepository.com/artifact/com.alibaba/druid --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.10</version> </dependency>
1.2 .1配置文件:
spring: datasource: url: jdbc:mysql://192.168.1.102:3306/jdbc username: root password: 123456 driver-class-name: com.mysql.cj.jdbc.Driver type: com.alibaba.druid.pool.DruidDataSource #数据源其他配置 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
1.2.2 编写配置类 druidConfig 并以引入日志依赖
@Configuration public class druidConfig { @ConfigurationProperties(prefix = "spring.datasource") @Bean public DataSource druid() { return new DruidDataSource(); } }
<dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency>
在之前的测试类中:debug测试:
可以看到和我们之前在配置文件配置的一样。
1.2.3 在配置类中 配置druid后台监控;
@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; } }
这样就可以通过后台监控数据源的访问情况了。
输入:
三:整合mybatis
1.1添加依赖
<dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-sta1rter</artifactId> <version>1.3.2</version> </dependency>
1.2.1 注解版
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
dao层:
@Mapper public interface userMapper { @Select("select *from user where id=#{id}") User selelctById(Integer id); @Delete("delete from user where id=#{id}") Integer delectById(Integer id); @Insert("insert into user(name,age) values(#{name},#{age}) ") User insertUser(User user); @Update("update user set name=#{name}where id=#{id}") Integer updateById(Integer id); }
测试userController:
@RestController public class UserController { @Autowired userMapper usermapper; @RequestMapping("/selectById") public User selectById(){ return usermapper.selelctById(2); } }
测试结果:
1.2.2 配置文件版
配置文件添加:
mybatis: mapper-locations: classpath:mybatis/mapper/*.xml 指定sql映射文件的位置 type-aliases-package: com.springboot.springboot.pojo 指定实体类所在的包
原文地址:https://www.cnblogs.com/fastguy/p/10801953.html
时间: 2024-11-08 14:55:38