内容简介:SpringBoot + Mybatis + Druid多数据源集成的心得
最近在做一个项目,需要使用SpringBoot+Mybatis+Druid使用多数据源,前提条件是数据源的个数和名称不确定,是在application.properties文件中设定,在使用时根据条件动态切换。
这样就不能像Druid官网提到的,通过ConfigurationProperties注解创建多个DruidDataSource,因为这样属于硬编码,添加一个数据源就要再添加代码,我考虑的是只使用一套构建DataSource的代码,添加或删除数据源只需要修改配置文件。
Spring提供的AbstractRoutingDataSource提供了运行时动态切换DataSource的功能,但是AbstractRoutingDataSource对象中包含的DataSourceBuilder构建的仅仅是Spring JDBC的DataSource,并不是我们使用的DruidDataSource,需要自行构建。
这篇文章介绍了如何使用AbstractRoutingDataSource构建多数据源,但是它有几点不足:
1)构建的TargetDataSources中的DataSource仅包含driverClassName,username,password,url等基本属性,对于DruidDataSource这种复杂的DataSource,仅赋这些属性是不够的。
2)构建AbstractingRoutingDataSource使用ImportBeanDefinitionRegistrar进行注册,不够直观。
我的方案对这个解决方案做了一定的修改。
我在本地 MySQL 新建三个数据库testdb_1,testdb_2,testdb_3,每个数据库新建一张student表
建表语句如下
CREATE TABLE student
(
ID
int(11) NOT NULL AUTO_INCREMENT,
NAME
varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
CLASS_NAME
varchar(30) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
CREATE_DATE
timestamp(0) NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP(0),
UPDATE_DATE
timestamp(0) NOT NULL ON UPDATE CURRENT_TIMESTAMP(0),
PRIMARY KEY ( ID
) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 0 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
分别创建三个用户appuser_1,appuser_2,appuser_3,用于连接三个数据库(需要赋予它们访问数据库的相应权限)
我们构建一个名为SpringBootDruidMultiDB的SpringBoot项目,导入mybatis-spring-boot-starter和
spring-boot-starter-web以及spring-boot-starter-test,为了使用Druid方便,项目还导入druid-spring-boot-starter。由于使用Log4j2记录日志,在每个导入的starter中都要exclude掉spring-boot-starter-logging(去掉自带的slf4j),添加log4j2所需要的库,pom文件的配置如下
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.9.RELEASE</version> <relativePath/> </parent> <dependencies> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.6</version> <exclusions> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-logging</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.1</version> <exclusions> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-logging</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <exclusions> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-logging</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <exclusions> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-logging</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.10.0</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.10.0</version> </dependency> <dependency> <groupId>com.lmax</groupId> <artifactId>disruptor</artifactId> <version>3.3.7</version> </dependency> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.2</version> </dependency> </dependencies>
修改src/main/resources文件,添加多个数据源信息
spring.custom.datasource.name=db1,db2,db3
spring.custom.datasource.db1.name=db1
spring.custom.datasource.db1.driver-class-name=com.mysql.jdbc.Driver
spring.custom.datasource.db1.url=jdbc:mysql://localhost:3306/testdb_1?characterEncoding=utf8&autoReconnect=true&useSSL=false&useAffectedRows=true
spring.custom.datasource.db1.username=appuser1
spring.custom.datasource.db1.password=admin
spring.custom.datasource.db2.name=db2
spring.custom.datasource.db2.driver-class-name=com.mysql.jdbc.Driver
spring.custom.datasource.db2.url=jdbc:mysql://localhost:3306/testdb_2?characterEncoding=utf8&autoReconnect=true&useSSL=false&useAffectedRows=true
spring.custom.datasource.db2.username=appuser2
spring.custom.datasource.db2.password=admin
spring.custom.datasource.db3.name=db3
spring.custom.datasource.db3.driver-class-name=com.mysql.jdbc.Driver
spring.custom.datasource.db3.url=jdbc:mysql://localhost:3306/testdb_3?characterEncoding=utf8&autoReconnect=true&useSSL=false&useAffectedRows=true
spring.custom.datasource.db3.username=appuser3
spring.custom.datasource.db3.password=admin
再添加DruidDataSource的属性
spring.datasource.druid.initial-size=5
spring.datasource.druid.min-idle=5
spring.datasource.druid.async-init=true
spring.datasource.druid.async-close-connection-enable=true
spring.datasource.druid.max-active=20
spring.datasource.druid.max-wait=60000
spring.datasource.druid.time-between-eviction-runs-millis=60000
spring.datasource.druid.min-evictable-idle-time-millis=30000
spring.datasource.druid.validation-query=SELECT 1 FROM DUAL
spring.datasource.druid.test-while-idle=true
spring.datasource.druid.test-on-borrow=false
spring.datasource.druid.test-on-return=false
spring.datasource.druid.pool-prepared-statements=true
spring.datasource.druid.max-pool-prepared-statement-per-connection-size=20
spring.datasource.druid.filters=stat,wall,log4j2
spring.datasource.druid.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
spring.datasource.druid.web-stat-filter.enabled=true
spring.datasource.druid.web-stat-filter.url-pattern=/*
spring.datasource.druid.web-stat-filter.exclusions= .js, .gif, .jpg, .png, .css, .ico,/druid/*
spring.datasource.druid.web-stat-filter.session-stat-enable=true
spring.datasource.druid.web-stat-filter.profile-enable=true
spring.datasource.druid.stat-view-servlet.enabled=true
spring.datasource.druid.stat-view-servlet.url-pattern=/druid/*
spring.datasource.druid.stat-view-servlet.login-username=admin
spring.datasource.druid.stat-view-servlet.login-password=admin
spring.datasource.druid.stat-view-servlet.reset-enable=false
spring.datasource.druid.stat-view-servlet.allow=127.0.0.1
spring.datasource.druid.filter.wall.enabled=true
spring.datasource.druid.filter.wall.db-type=mysql
spring.datasource.druid.filter.wall.config.alter-table-allow=false
spring.datasource.druid.filter.wall.config.truncate-allow=false
spring.datasource.druid.filter.wall.config.drop-table-allow=false
spring.datasource.druid.filter.wall.config.none-base-statement-allow=false
spring.datasource.druid.filter.wall.config.update-where-none-check=true
spring.datasource.druid.filter.wall.config.select-into-outfile-allow=false
spring.datasource.druid.filter.wall.config.metadata-allow=true
spring.datasource.druid.filter.wall.log-violation=true
spring.datasource.druid.filter.wall.throw-exception=true
spring.datasource.druid.filter.stat.log-slow-sql= true
spring.datasource.druid.filter.stat.slow-sql-millis=1000
spring.datasource.druid.filter.stat.merge-sql=true
spring.datasource.druid.filter.stat.db-type=mysql
spring.datasource.druid.filter.stat.enabled=true
spring.datasource.druid.filter.log4j2.enabled=true
spring.datasource.druid.filter.log4j2.connection-log-enabled=true
spring.datasource.druid.filter.log4j2.connection-close-after-log-enabled=true
spring.datasource.druid.filter.log4j2.connection-commit-after-log-enabled=true
spring.datasource.druid.filter.log4j2.connection-connect-after-log-enabled=true
spring.datasource.druid.filter.log4j2.connection-connect-before-log-enabled=true
spring.datasource.druid.filter.log4j2.connection-log-error-enabled=true
spring.datasource.druid.filter.log4j2.data-source-log-enabled=true
spring.datasource.druid.filter.log4j2.result-set-log-enabled=true
spring.datasource.druid.filter.log4j2.statement-log-enabled=true
在src/main/resources目录下添加log4j2.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="OFF">
<properties> <property name="logPath">./logs/</property> </properties> <Appenders> <Console name="Console" target="SYSTEM_OUT" ignoreExceptions="false"> <PatternLayout pattern="%d [%t] %-5p %c - %m%n"/> <ThresholdFilter level="trace" onMatch="ACCEPT" onMismatch="DENY"/> </Console> <RollingFile name="infoLog" fileName="${logPath}/multidb_info.log" filePattern="${logPath}/multidb_info-%d{yyyy-MM-dd}.log" append="true" immediateFlush="true"> <PatternLayout pattern="%d [%t] %-5p %c - %m%n" /> <TimeBasedTriggeringPolicy /> <Policies> <SizeBasedTriggeringPolicy size="10 MB"/> </Policies> <DefaultRolloverStrategy max="30"/> <Filters> <ThresholdFilter level="error" onMatch="DENY" onMismatch="NEUTRAL"/> <ThresholdFilter level="trace" onMatch="ACCEPT" onMismatch="DENY"/> </Filters> </RollingFile> <RollingFile name="errorLog" fileName="${logPath}/multidb_error.log" filePattern="${logPath}/multidb_error-%d{yyyy-MM-dd}.log" append="true" immediateFlush="true"> <PatternLayout pattern="%d [%t] %-5p %c - %m%n" /> <TimeBasedTriggeringPolicy /> <Policies> <SizeBasedTriggeringPolicy size="10 MB"/> </Policies> <DefaultRolloverStrategy max="30"/> <Filters> <ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY"/> </Filters> </RollingFile> </Appenders> <Loggers> <AsyncLogger name="org.springframework.*" level="INFO"/> <AsyncLogger name="com.rick" level="INFO" additivity="false"> <AppenderRef ref="infoLog" /> <AppenderRef ref="errorLog" /> <AppenderRef ref="Console" /> </AsyncLogger> <Root level="INFO"> <AppenderRef ref="Console"/> </Root> </Loggers>
</Configuration>
一开始我参照单数据源的构建方式,想像下面的方式构建DruidDataSource数据源
public DataSource createDataSource(Environment environment,
String prefix)
{
return DruidDataSourceBuilder.create().build(environment,prefix);
}
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以上所述就是小编给大家介绍的《SpringBoot + Mybatis + Druid多数据源集成的心得》,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对 码农网 的支持!
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