mycat读写分离方案二SpringbootJPA结合Mycat
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@Configurationpublic 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
@Autowiredprivate 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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