Question

我们将Spring，Hibernate和MySQL用于我们的应用程序。但有时查询会生成 CannotAcquireLockException ，代码如下所示。

public Ledger[] storeOrUpdateLedgers(Ledger[] ledgers,int iClinicId) throws DataAccessException {

    List<Ledger> ledgerList = new ArrayList<Ledger>();
    for(int i = 0; i < ledgers.length; i++) {
        ledgers[i].setiClinicId(iClinicId);
        ledgerList.add(ledgers[i]);
    }

    for(int i = 0; i < ledgerList.size(); i++) {
        getHibernateTemplate().clear();
        getHibernateTemplate().saveOrUpdate(ledgerList.get(i));
        getHibernateTemplate().flush();
    }

}

public class Ledger implements Serializable {

    private int iLedgerId;
    private int iClinicId;
    private int iPatientId;
    private int iProviderId;
    private int iVisitId;
    private int iPaymentId;
    private int iClaimId;
    private int iProcedureId;
    private String sDate;
    private double dAmount;
    private byte btType;
    private String sDesc;
    private byte btCurrParty;
    private int iCurrPartyId;
    private byte btRespParty;
    private int iRespPartyId;
    private boolean active;
    private int iParentId;
    private int iReasonId;
    private String sDos;
    private int iU_ID;
    private String sEntryDate;   // no mapping required


    public int getiU_ID() {
        return iU_ID;
    }

    public void setiU_ID(int iUID) {
        iU_ID = iUID;
    }

    public int getiLedgerId() {
        return iLedgerId;
    }

    public void setiLedgerId(int iLedgerId) {
        this.iLedgerId = iLedgerId;
    }

    public int getiClinicId() {
        return iClinicId;
    }

    public void setiClinicId(int iClinicId) {
        this.iClinicId = iClinicId;
    }

    public int getiPatientId() {
        return iPatientId;
    }

    public void setiPatientId(int iPatientId) {
        this.iPatientId = iPatientId;
    }

    public int getiProviderId() {
        return iProviderId;
    }

    public void setiProviderId(int iProviderId) {
        this.iProviderId = iProviderId;
    }

    public int getiVisitId() {
        return iVisitId;
    }

    public void setiVisitId(int iVisitId) {
        this.iVisitId = iVisitId;
    }

    public int getiPaymentId() {
        return iPaymentId;
    }

    public void setiPaymentId(int iPaymentId) {
        this.iPaymentId = iPaymentId;
    }

    public int getiClaimId() {
        return iClaimId;
    }

    public void setiClaimId(int iClaimId) {
        this.iClaimId = iClaimId;
    }

    public int getiProcedureId() {
        return iProcedureId;
    }

    public void setiProcedureId(int iProcedureId) {
        this.iProcedureId = iProcedureId;
    }

    public String getsDate() {
        return sDate;
    }

    public void setsDate(String sDate) {
        this.sDate = sDate;
    }

    public double getdAmount() {
        return dAmount;
    }

    public void setdAmount(double dAmount) {
        this.dAmount = dAmount;
    }

    public byte getbtType() {
        return btType;
    }

    public void setbtType(byte btType) {
        this.btType = btType;
    }

    public String getsDesc() {
        return sDesc;
    }

    public void setsDesc(String sDesc) {
        this.sDesc = sDesc;
    }

    public byte getbtCurrParty() {
        return btCurrParty;
    }

    public void setbtCurrParty(byte btCurrParty) {
        this.btCurrParty = btCurrParty;
    }

    public int getiCurrPartyId() {
        return iCurrPartyId;
    }

    public void setiCurrPartyId(int iCurrPartyId) {
        this.iCurrPartyId = iCurrPartyId;
    }

    public byte getbtRespParty() {
        return btRespParty;
    }

    public void setbtRespParty(byte btRespParty) {
        this.btRespParty = btRespParty;
    }

    public int getiRespPartyId() {
        return iRespPartyId;
    }

    public void setiRespPartyId(int iRespPartyId) {
        this.iRespPartyId = iRespPartyId;
    }

    public boolean isActive() {
        return active;
    }

    public void setActive(boolean active) {
        this.active = active;
    }

    public int getiParentId() {
        return iParentId;
    }

    public void setiParentId(int iParentId) {
        this.iParentId = iParentId;
    }

    public int getiReasonId() {
        return iReasonId;
    }

    public void setiReasonId(int iReasonId) {
        this.iReasonId = iReasonId;
    }

    public String getsDos() {
        return sDos;
    }

    public void setsDos(String sDos) {
        this.sDos = sDos;
    }

    public String getsEntryDate() {
        return sEntryDate;
    }

    public void setsEntryDate(String sEntryDate) {
        this.sEntryDate = sEntryDate;
    }

}

Hibernate映射：

<class name="com.iris.allofactor.data.vo.Ledger" table="LEDGER">
    <id name="iLedgerId" column="LEDGER_ID" unsaved-value="0">
        <generator class="native"/>
    </id>
    <property name="iClinicId" column="CLINIC_ID"></property>
    <property name="iPatientId" column="PATIENT_ID"></property>
    <property name="iProviderId" column="PROVIDER_ID"></property>
    <property name="iVisitId" column="VISIT_ID"></property>
    <property name="iPaymentId" column="PAYMENT_ID"></property>
    <property name="iClaimId" column="CLAIM_ID"></property>
    <property name="iProcedureId" column="PROCEDURE_ID"></property>
    <property name="sDate" column="DATE"></property>
    <property name="dAmount" column="AMOUNT"></property>
    <property name="btType" column="TYPE"></property>
    <property name="sDesc" column="DESCRIPTION"></property>
    <property name="btCurrParty" column="CURR_PARTY"></property>
    <property name="iCurrPartyId" column="CURR_PARTY_ID"></property>
    <property name="btRespParty" column="RESP_PARTY"></property>
    <property name="iRespPartyId" column="RESP_PARTY_ID"></property>
    <property name="active" column="ACTIVE"></property>
    <property name="iParentId" column="PARENT_ID"></property>
    <property name="iReasonId" column="REASON_ID"></property>
    <property name="sDos" column="DOS"></property>
    <property name="iU_ID" column="USER_ID"></property>
</class>

Stacktrace如下：

at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:244)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
at org.springframework.orm.hibernate3.HibernateAccessor.convertJdbcAccessException(HibernateAccessor.java:424)
at org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:410)
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:424)
at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
at org.springframework.orm.hibernate3.HibernateTemplate.flush(HibernateTemplate.java:890)
at com.iris.allofactor.data.dao.hibernate.HibernateLedgerDao.storeOrUpdateLedgers(HibernateLedgerDao.java:97)
at com.iris.allofactor.data.dao.impl.LedgerAuditBODaoImpl.storeOrUpdateLedgers(LedgerAuditBODaoImpl.java:64)
at com.iris.allofactor.data.dao.impl.ChargesDaoImpl.storeOrUpdateCharges(ChargesDaoImpl.java:844)
at com.iris.allofactor.data.dao.impl.ClaimEncounterBODaoImpl.addorEditClaimWhileClaimIdAndVisitIdIsPresent(ClaimEncounterBODaoImpl.java:1072)
at com.iris.allofactor.data.dao.impl.ClaimEncounterBODaoImpl.storeOrUpdateClaim(ClaimEncounterBODaoImpl.java:819)
at com.iris.allofactor.data.dao.facade.DaoFacadeImpl.storeOrUpdateClaim(DaoFacadeImpl.java:1915)
at sun.reflect.GeneratedMethodAccessor2549.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy2.storeOrUpdateClaim(Unknown Source)
at com.iris.allofactor.services.impl.ClaimServiceImpl.addorEditClaim(ClaimServiceImpl.java:447)
at com.iris.allofactor.services.soap.impl.ClaimWebServiceImpl.addorEditClaim(ClaimWebServiceImpl.java:337)
at sun.reflect.GeneratedMethodAccessor2548.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.axis.providers.java.RPCProvider.invokeMethod(RPCProvider.java:397)
at org.apache.axis.providers.java.RPCProvider.processMessage(RPCProvider.java:186)
at org.apache.axis.providers.java.JavaProvider.invoke(JavaProvider.java:323)
at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)
at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118)
at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)
at org.apache.axis.handlers.soap.SOAPService.invoke(SOAPService.java:453)
at org.apache.axis.server.AxisServer.invoke(AxisServer.java:281)
at org.apache.axis.transport.http.AxisServlet.doPost(AxisServlet.java:699)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:327)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)

它反复生成此异常，我认为我的方法存在一些问题。

Answer 1

这是明确的死锁情况。这与MySQL错误相关，而不是与类的Hibernate问题相关。首先让我们回顾一下死锁的定义：

死锁是两种或更多竞争行为的情况每个人都在等待对方完成，因而也没有。

有关详细信息，请参阅此页面：http://en.wikipedia.org/wiki/Deadlock

你如何处理这种情况。那么，您需要阅读以下文章：Deadlocks in InnoDB。它包含您需要的大部分信息。本文详细解释了如何跟踪和处理它必须阅读的死锁。

基本上，您需要根据以上信息执行以下步骤：

创建MySQL跟踪：跟踪在MySQL服务器上运行的所有查询。
获取死锁跟踪信息
将死锁跟踪和MySQL跟踪相互匹配，以确定死锁的原因。

关于InnoDB的文章也有一系列补救措施，所以我不打算在此重申。请记住死锁不是致命错误，您只需要处理它。所以可能会捕获异常并重试事务。还要确保Hibernate生成的查询是最佳的，因为他们正在使用索引等等。您可以尝试的另一件事是批处理 Hibernate上的事务在批处理中执行。

我确信通过上面的两个链接，您将能够处理问题，并且您自己完成这项工作将是宝贵的经验。如果你发现任何特定的项目你有问题，请将其添加到问题中，让我们处理。

Answer 2

我想知道您的问题是否与此主题中讨论的问题类似：Deadlock problems with Hibernate/Spring/MS-SQL。此特定问题的根本原因是您有一个线程对数据库执行查找/选择，而另一个线程正在尝试对数据库执行删除/插入。该线程中有2个解决方案。

第一个优化了查找和删除代码，使其成为一个SQL命令而不是两个。

# sql sudo code

# original query
find me this row where this=that
delete this row

# better query
delete this row where this=that

第二个建议的解决方案是在COLUMNS子句中使用WHERE创建索引，以便数据库不再锁定ROW，但现在会锁定密钥索引。

Answer 3

MySQL 列表中可能存在未完成的会话。它可能仍在运行。因为您的应用程序中的程序员或使用数据库的程序员的错误。

例如，您启动了一个会话，但由于错误，该进程卡住了，没有回滚。 **这种情况很少发生。

请手动删除所有会话

获取所有会话

SHOW FULL PROCESSLIST;

然后通过id杀死他们

KILL 192;

示例。

mysql> SHOW PROCESSLIST;
+-----+------+-----------------+------+---------+------+-------+---------------+
| Id  | User | Host            | db   | Command | Time | State | Info      |
+-----+------+-----------------+------+---------+------+-------+----------------+
| 143 | root | localhost:61179 | cds  | Query   |    0 | init  | SHOW PROCESSLIST |
| 192 | root | localhost:53793 | cds  | Sleep   |    4 |       | NULL      |
+-----+------+-----------------+------+---------+------+-------+----------------+
2 rows in set (0.00 sec)

mysql> KILL 192;
Query OK, 0 rows affected (0.00 sec)

CannotAcquireLockException（Spring，Hibernate，MySQL）

3 个答案: