SpringBoot開(kāi)發(fā)中的數(shù)據(jù)源詳解

更新時(shí)間：2023年09月01日 09:59:02 作者：韓_師兄

這篇文章主要介紹了SpringBoot開(kāi)發(fā)中的數(shù)據(jù)源詳解,數(shù)據(jù)源(Data Source)顧名思義,數(shù)據(jù)的來(lái)源,是提供某種所需要數(shù)據(jù)的器件或原始媒體,在數(shù)據(jù)源中存儲(chǔ)了所有建立數(shù)據(jù)庫(kù)連接的信息,需要的朋友可以參考下

1 數(shù)據(jù)源的自動(dòng)配置-HikariDataSource

1 導(dǎo)入JDBC

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jdbc</artifactId>
        </dependency>

數(shù)據(jù)庫(kù)驅(qū)動(dòng), 導(dǎo)入JDBC場(chǎng)景，官方?jīng)]有導(dǎo)入驅(qū)動(dòng), 因其不知道我們接下要操作什么數(shù)據(jù)庫(kù)。

默認(rèn)版本：<mysql.version>8.0.22</mysql.version>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
<!--            <version>5.1.49</version>-->
        </dependency>
想要修改版本
1、直接依賴(lài)引入具體版本（maven的就近依賴(lài)原則）
2、重新聲明版本（maven的屬性的就近優(yōu)先原則）
    <properties>
        <java.version>1.8</java.version>
        <mysql.version>5.1.49</mysql.version>
    </properties>

2 自動(dòng)配置

自動(dòng)配置的類(lèi)

DataSourceAutoConfiguration ：數(shù)據(jù)源的自動(dòng)配置
- 修改數(shù)據(jù)源相關(guān)的配置：spring.datasource
- 數(shù)據(jù)庫(kù)連接池的配置，是自己容器中沒(méi)有DataSource才自動(dòng)配置的
- 底層配置好的連接池是：HikariDataSource

@Configuration(proxyBeanMethods = false)
	@Conditional(PooledDataSourceCondition.class)
	@ConditionalOnMissingBean({ DataSource.class, XADataSource.class })
	@Import({ DataSourceConfiguration.Hikari.class, DataSourceConfiguration.Tomcat.class,
			DataSourceConfiguration.Dbcp2.class, DataSourceConfiguration.OracleUcp.class,
			DataSourceConfiguration.Generic.class, DataSourceJmxConfiguration.class })
	protected static class PooledDataSourceConfiguration{
    }

說(shuō)明:

DataSourceTransactionManagerAutoConfiguration：事務(wù)管理器的自動(dòng)配置
JdbcTemplateAutoConfiguration： JdbcTemplate的自動(dòng)配置，可以來(lái)對(duì)數(shù)據(jù)庫(kù)進(jìn)行crud
- 可以修改這個(gè)配置項(xiàng)@ConfigurationProperties(prefix = “spring.jdbc”) 來(lái)修改JdbcTemplate
- @Bean@Primary JdbcTemplate；容器中有這個(gè)組件
JndiDataSourceAutoConfiguration： jndi的自動(dòng)配置
XADataSourceAutoConfiguration：分布式事務(wù)相關(guān)的

3 修改默認(rèn)配置

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/test
    username: root
    password: root
    driver-class-name: com.mysql.jdbc.Driver

4 測(cè)試

@Slf4j
@SpringBootTest
class Boot05WebAdminApplicationTests {
    @Autowired
    JdbcTemplate jdbcTemplate;
    @Test
    void contextLoads() {
//        jdbcTemplate.queryForObject("select * from t_user")
//        jdbcTemplate.queryForList("select * from t_user",)
        Long aLong = jdbcTemplate.queryForObject("select count(*) from t_user", Long.class);
        log.info("記錄總數(shù)：{}",aLong);
    }
}

2 Druid數(shù)據(jù)源

1 druid的使用

創(chuàng)建數(shù)據(jù)源

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.17</version>
        </dependency>
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
		destroy-method="close">
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
		<property name="maxActive" value="20" />
		<property name="initialSize" value="1" />
		<property name="maxWait" value="60000" />
		<property name="minIdle" value="1" />
		<property name="timeBetweenEvictionRunsMillis" value="60000" />
		<property name="minEvictableIdleTimeMillis" value="300000" />
		<property name="testWhileIdle" value="true" />
		<property name="testOnBorrow" value="false" />
		<property name="testOnReturn" value="false" />
		<property name="poolPreparedStatements" value="true" />
		<property name="maxOpenPreparedStatements" value="20" />
</bean>

2 使用官方starter

引入依賴(lài)

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.17</version>
        </dependency>

自動(dòng)配置

擴(kuò)展配置項(xiàng) spring.datasource.druid
DruidSpringAopConfiguration.class, 監(jiān)控SpringBean的；配置項(xiàng)：spring.datasource.druid.aop-patterns
DruidStatViewServletConfiguration.class, 監(jiān)控頁(yè)的配置：spring.datasource.druid.stat-view-servlet；默認(rèn)開(kāi)啟
DruidWebStatFilterConfiguration.class, web監(jiān)控配置；spring.datasource.druid.web-stat-filter；默認(rèn)開(kāi)啟
DruidFilterConfiguration.class}) 所有Druid自己filter的配置

    private static final String FILTER_STAT_PREFIX = "spring.datasource.druid.filter.stat";
    private static final String FILTER_CONFIG_PREFIX = "spring.datasource.druid.filter.config";
    private static final String FILTER_ENCODING_PREFIX = "spring.datasource.druid.filter.encoding";
    private static final String FILTER_SLF4J_PREFIX = "spring.datasource.druid.filter.slf4j";
    private static final String FILTER_LOG4J_PREFIX = "spring.datasource.druid.filter.log4j";
    private static final String FILTER_LOG4J2_PREFIX = "spring.datasource.druid.filter.log4j2";
    private static final String FILTER_COMMONS_LOG_PREFIX = "spring.datasource.druid.filter.commons-log";
    private static final String FILTER_WALL_PREFIX = "spring.datasource.druid.filter.wall";

常見(jiàn)配置案例

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/test
    username: root
    password: root
    driver-class-name: com.mysql.jdbc.Driver
    druid:
      aop-patterns: com.atguigu.admin.*  #監(jiān)控SpringBean
      filters: stat,wall     # 底層開(kāi)啟功能，stat（sql監(jiān)控），wall（防火墻）
      stat-view-servlet:   # 配置監(jiān)控頁(yè)功能
        enabled: true
        login-username: admin
        login-password: admin
        resetEnable: false
      web-stat-filter:  # 監(jiān)控web
        enabled: true
        urlPattern: /*
        exclusions: '*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*'
      filter:
        stat:    # 對(duì)上面filters里面的stat的詳細(xì)配置
          slow-sql-millis: 1000
          logSlowSql: true
          enabled: true
        wall:
          enabled: true
          config:
            drop-table-allow: false

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