SpringBoot + Mycat + APO separate read and write

Mycat environment to build

Mycat Download
Mycat document
then prequel has built a good start Mysql master-slave replication

# 解压
tar -zxvf Mycat-server-1.6.7.1-release-20190627191042-linux.tar.gz
#启动
./bin/mycat start
#关闭
./bin/mycat stop
#启动日志
tail -f logs/wrapper.log
#运行日志
tail -f logs/mycat.log

View, wrapper.log. The figure is lower appear successful start

and then enter the conf directory
configuration schema.xml

<mycat:schema xmlns:mycat="http://io.mycat/">
    <!-- test是mycat的逻辑库名称，链接需要用的 -->
    <schema name="test" checkSQLschema="false" sqlMaxLimit="100" dataNode="noed-1"></schema>
        <!-- database 是MySQL数据库的库名 -->
    <dataNode name="noed-1" dataHost="dbHost1" database="test" />

    <dataHost name="dbHost1" maxCon="1000" minCon="10" balance="3" writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
        <heartbeat>select user()</heartbeat>
        <!-- 可以配置多个主从 -->
        <writeHost host="hostM1" url="192.168.100.131:3306" user="root" password="root">
            <!-- 可以配置多个从库 -->
            <readHost host="hostS2" url="192.168.100.132:3306" user="root" password="root" />
        </writeHost>
    </dataHost>
</mycat:schema>

Configuring server.xml

<mycat:server xmlns:mycat="http://io.mycat/">
   <!-- 读写都可用的用户 -->
    <user name="root" defaultAccount="true">
        <property name="password">root</property>
        <property name="schemas">test</property>
    </user>

    <!-- 只读用户 -->
    <user name="user">
        <property name="password">user</property>
        <property name="schemas">test</property>
        <property name="readOnly">true</property>
    </user>
</mycat:server>

Attributes	value
The client connection port number	8066
server. xmI	Mycat profiles, account settings, parameters, etc.
schema. xmI	Mycat corresponding physical configuration database and database tables
rule. xmI	Mycat slicing (sub-library sub-table) RULES

There is a problem when you have configured these, that is, when the logical library name with the actual library name Mysql is not the same. When connected Mycat middleware will not find a table, the table can not be created. Later View Mycat.log see, the real time database queries also carry the name of the logical library. It is not clear where the configuration is wrong. Then put logic libraries and real name Mysql database into a consistent



view the configuration of the user is unable to read write data.

Springboot separate read and write

• Data source connection configuration

application.yml

spring:
  datasource:
    ####写数据源
    update:
      jdbc-url: jdbc:mysql://192.168.100.150:8066/test
      driver-class-name: com.mysql.jdbc.Driver
      username: root
      password: root
    ###读数据源
    select:
      jdbc-url: jdbc:mysql://192.168.100.150:8066/test
      driver-class-name: com.mysql.jdbc.Driver
      username: user
      password: user
    type: com.alibaba.druid.pool.DruidDataSource

• Configuration read and write data source

DataSourceConfig.java

/**
 * 配置读写数据源
 */
@Configuration
public class DataSourceConfig {

    @Bean(name = "selectDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.select")
    public DataSource dataSource1() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "updateDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.update")
    public DataSource dataSource2() {
        return DataSourceBuilder.create().build();
    }

}

• Save the local data source

DataSourceContextHolder.java

/**
 * 保存本地多数据源
 */
@Component
@Lazy(false)
public class DataSourceContextHolder {
    private static final ThreadLocal<String> contextHolder = new ThreadLocal<>();

    // 设置数据源类型
    public static void setDbType(String dbType) {
        contextHolder.set(dbType);
    }

    public static String getDbType() {
        return contextHolder.get();
    }

    public static void clearDbType() {
        contextHolder.remove();
    }

}

• Dynamic configuration switching data source class

DynamicDataSource.java

/**
 * 该类继承自 AbstractRoutingDataSource 类，在访问数据库时会调用该类的 determineCurrentLookupKey() 方法获取数据库实例的 key
 */
@Component
@Primary
public class DynamicDataSource extends AbstractRoutingDataSource {
    private static final Logger logger = LoggerFactory.getLogger(DynamicDataSource.class);
    @Autowired
    @Qualifier("selectDataSource")
    private DataSource selectDataSource;
    @Autowired
    @Qualifier("updateDataSource")
    private DataSource updateDataSource;

    /**
     * 返回生效的数据源名称
     */
    @Override
    protected Object determineCurrentLookupKey() {
        logger.info("DataSourceContextHolder：{}", DataSourceContextHolder.getDbType());
        return DataSourceContextHolder.getDbType();
    }
    /**
     * 配置使用的数据源信息，如果不存在就使用默认的数据源
     */
    @Override
    public void afterPropertiesSet() {
        Map<Object, Object> map = new HashMap<>();
        map.put("selectDataSource", selectDataSource);
        map.put("updateDataSource", updateDataSource);
        //注册数据源
        setTargetDataSources(map);
        setDefaultTargetDataSource(updateDataSource);
        super.afterPropertiesSet();
    }
}

• APO arrangement

DataSourceAOP.java

@Aspect
@Component
@Lazy(false)
// Order设定AOP执行顺序 使之在数据库事务上先执行
@Order(0)
public class DataSourceAOP {
    private static final Logger logger = LoggerFactory.getLogger(DataSourceAOP.class);
    //横切点
    @Before("execution(* com.yk.service.*.*(..))")
    public void process(JoinPoint joinPoint) {
        String methodName = joinPoint.getSignature().getName();
        if (methodName.startsWith("get") || methodName.startsWith("count") || methodName.startsWith("find")
                || methodName.startsWith("list") || methodName.startsWith("select") || methodName.startsWith("check")) {
            DataSourceContextHolder.setDbType("selectDataSource");
            logger.info("使用的是读数据源：selectDataSource");
        } else {
            DataSourceContextHolder.setDbType("updateDataSource");
            logger.info("使用的是写数据源：updateDataSource");
        }
    }
}

The main configuration is complete, the other is dao, service, controller up.