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