MySQL的desc關鍵字作為了欄位名稱查詢問題
阿新 • • 發佈：2019-01-24
引言：今天在開發的時候，由於業務需求，所有要在產品表的資料庫中多查詢一個欄位（產品描述資訊），欄位名稱是desc.
原本資料庫查詢語句如下：
" select id, name, price, martPrice, picturePath, firstImgUrl, smallImgUrl, stock, productNo, rootOrgId from EntProduct where id = ?"新增欄位後修改為如下：" select id, name, price, martPrice, picturePath, firstImgUrl, smallImgUrl, stock, productNo, rootOrgId, desc from EntProduct where id = ?"
可能很多人覺得這個語句沒有問題，但是在執行查詢的時候出現下面的異常資訊：java.lang.RuntimeException: org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token: desc near line 1, column 94 [select id,name,price,martPrice,picturePath,firstImgUrl,smallImgUrl,stock,productNo,rootOrgId,desc from com.product.vo.EntProduct where id=?] org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token: desc near line 1, column 94 [select id,name,price,martPrice,picturePath,firstImgUrl,smallImgUrl,stock,productNo,rootOrgId,desc from com.product.vo.EntProduct where id=?] at org.hibernate.hql.internal.ast.QuerySyntaxException.convert(QuerySyntaxException.java:54) at org.hibernate.hql.internal.ast.QuerySyntaxException.convert(QuerySyntaxException.java:47) at org.hibernate.hql.internal.ast.ErrorCounter.throwQueryException(ErrorCounter.java:79) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:276) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:180) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136) at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:101) at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:80) at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:119) at org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:214) at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:192) at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1537) at com.product.dao.EntProductDao.getProductByProductId(EntProductDao.java:2618) at com.product.dao.LimitBuySetDao.getTopTen(LimitBuySetDao.java:238) at com.product.manager.LimitBuySetManager.getOneByTime(LimitBuySetManager.java:714) at com.alibaba.dubbo.common.bytecode.Wrapper21.invokeMethod(Wrapper21.java) at com.alibaba.dubbo.rpc.proxy.javassist.JavassistProxyFactory$1.doInvoke(JavassistProxyFactory.java:46) at com.alibaba.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker.java:72) at com.alibaba.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:53) at com.alibaba.dubbo.rpc.filter.ExceptionFilter.invoke(ExceptionFilter.java:64) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.rpc.filter.TimeoutFilter.invoke(TimeoutFilter.java:42) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:75) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.rpc.protocol.dubbo.filter.TraceFilter.invoke(TraceFilter.java:78) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.rpc.filter.ContextFilter.invoke(ContextFilter.java:60) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.rpc.filter.GenericFilter.invoke(GenericFilter.java:112) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.rpc.filter.ClassLoaderFilter.invoke(ClassLoaderFilter.java:38) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.rpc.filter.EchoFilter.invoke(EchoFilter.java:38) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol$1.reply(DubboProtocol.java:108) at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.handleRequest(HeaderExchangeHandler.java:84) at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.received(HeaderExchangeHandler.java:170) at com.alibaba.dubbo.remoting.transport.DecodeHandler.received(DecodeHandler.java:52) at com.alibaba.dubbo.remoting.transport.dispatcher.ChannelEventRunnable.run(ChannelEventRunnable.java:82) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) at com.alibaba.dubbo.rpc.filter.ExceptionFilter.invoke(ExceptionFilter.java:108) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.rpc.filter.TimeoutFilter.invoke(TimeoutFilter.java:42) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:75) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.rpc.protocol.dubbo.filter.TraceFilter.invoke(TraceFilter.java:78) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.rpc.filter.ContextFilter.invoke(ContextFilter.java:60) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.rpc.filter.GenericFilter.invoke(GenericFilter.java:112) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.rpc.filter.ClassLoaderFilter.invoke(ClassLoaderFilter.java:38) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.rpc.filter.EchoFilter.invoke(EchoFilter.java:38) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol$1.reply(DubboProtocol.java:108) at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.handleRequest(HeaderExchangeHandler.java:84) at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.received(HeaderExchangeHandler.java:170) at com.alibaba.dubbo.remoting.transport.DecodeHandler.received(DecodeHandler.java:52) at com.alibaba.dubbo.remoting.transport.dispatcher.ChannelEventRunnable.run(ChannelEventRunnable.java:82) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745)
錯誤資訊應該很明顯，就是新增的查詢desc欄位有問題。
其實出現這個錯誤的原因是desc這個單詞是MySQL資料庫的關鍵字，所有sql語句執行到這裡的時候覺得語句有問題
但是由於這個欄位名稱是很多地方都用到的，所有不可能一一去修改，最後我用別名寫sql語句
執行成功的sql語句如下：
" select e.id, e.name, e.price, e.martPrice, e.picturePath, e.firstImgUrl, e.smallImgUrl, e.stock, e.productNo, e.rootOrgId, e.desc from EntProduct as e where id = ?"