mycat读写分离方案二SpringbootJPA结合Mycat

编程

Mycat读写分离可以看 mycat读写分离方案一

1.application.properties配置连接

只要连接上mycat就可以和正常的mysql连接一样

spring.datasource.url  = jdbc:mysql://127.0.0.1:8066/test?autoReconnect=true&useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&serverTimezone=UTC
spring.datasource.primary.username = test_write
spring.datasource.primary.password = abcd12345678@
spring.datasource.driverClassName = com.mysql.jdbc.Driver

2.去除查询的readOnle事务

@Aspect

@Configuration

public class TxAdviceInterceptor {

private static final int TX_METHOD_TIMEOUT = 20;

     //所有的mysqlJPA接口,排除掉mongodb的

private static final String AOP_POINTCUT_EXPRESSION = "execution(* com..*Jpa*.*(..)) && !execution(* com..mongodb..*Jpa*.*(..))";

@Autowired

private PlatformTransactionManager transactionManager;

@Bean

public TransactionInterceptor txAdvice() {

NameMatchTransactionAttributeSource source = new NameMatchTransactionAttributeSource();

/*只读事务,不做更新操作*/

RuleBasedTransactionAttribute readOnlyTx = new RuleBasedTransactionAttribute();

readOnlyTx.setReadOnly(true);

readOnlyTx.setPropagationBehavior(TransactionDefinition.PROPAGATION_NOT_SUPPORTED );

/*当前存在事务就使用当前事务,当前不存在事务就创建一个新的事务*/

RuleBasedTransactionAttribute requiredTx = new RuleBasedTransactionAttribute();

requiredTx.setRollbackRules(

Collections.singletonList(new RollbackRuleAttribute(Exception.class)));

requiredTx.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);

requiredTx.setTimeout(TX_METHOD_TIMEOUT);

Map<String, TransactionAttribute> txMap = new HashMap<>();

txMap.put("add*", requiredTx);

txMap.put("save*", requiredTx);

txMap.put("insert*", requiredTx);

txMap.put("update*", requiredTx);

txMap.put("delete*", requiredTx);

        //读取的统一去除事务,不然mycat会走写库

// txMap.put("get*", readOnlyTx);

// txMap.put("query*", readOnlyTx);

//         txMap.put("find*", readOnlyTx);

source.setNameMap( txMap );

TransactionInterceptor txAdvice = new TransactionInterceptor(transactionManager, source);

return txAdvice;

}

@Bean

public Advisor txAdviceAdvisor() {

AspectJExpressionPointcut pointcut = new AspectJExpressionPointcut();

pointcut.setExpression(AOP_POINTCUT_EXPRESSION);

return new DefaultPointcutAdvisor(pointcut, txAdvice());

}

3.测试代码

Controller

@Autowired

private AccountJpa accountJpa;

/**

* http://localhost:12000/public/getAccounts

* @return

* @throws Exception

*/

@RequestMapping(value = "/getAccounts", method = RequestMethod.GET )

public Msg getAccounts() throws Exception{

return Msg.MsgSuccess(accountJpa.findAll());

}

 

 

Entity

import com.cloud.core.common.entity.BaseEntity;

import com.cloud.core.module.wechat.entity.WeChat;

import lombok.Data;

import org.springframework.context.annotation.Scope;

import javax.persistence.*;

import javax.validation.constraints.NotBlank;

import java.io.Serializable;

@Entity

@Table(name = "account",uniqueConstraints = { @UniqueConstraint(columnNames = { "account","is_delete" }) } )

@Scope(value = "prototype")

@Data

public class Account extends BaseEntity implements Serializable {

/**

* 账号

*/

@Column(name = "account")

@NotBlank(message = "请填写账号")

private String account;

/**

* 密码

*/

@Column(name = "password")

@NotBlank(message = "请填写密码")

private String password;

}

AccountJpa

import com.cloud.core.module.test.entity.Account;

import com.cloud.core.module.vote.entity.Operator;

import org.springframework.data.jpa.repository.JpaRepository;

public interface AccountJpa extends JpaRepository<Account, String> {

}

测试查询是否走读库

测试接口可以看到,一直读到是读库的数据

 

修改的正常处理就可以了,我就不再测试了。也这样正常使用事务,mycat是支持事务。(测试写的时候记得把从库数据改回和主库一样,我是为了测试才这样改的,不是正规操作)

 

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