Error selecting key or setting result to parameter object. Cause: java.sql.SQLSyntaxErrorException

## 通用mapper insertSelective方法报语法错误

报错信息如下

Caused by: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '?' at line 1at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:120)at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)at com.mysql.cj.jdbc.StatementImpl.executeInternal(StatementImpl.java:764)at com.mysql.cj.jdbc.StatementImpl.execute(StatementImpl.java:648)at com.alibaba.druid.filter.FilterChainImpl.statement_execute(FilterChainImpl.java:2958)at com.alibaba.druid.filter.FilterAdapter.statement_execute(FilterAdapter.java:2473)at com.alibaba.druid.filter.FilterEventAdapter.statement_execute(FilterEventAdapter.java:188)at com.alibaba.druid.filter.FilterChainImpl.statement_execute(FilterChainImpl.java:2956)at com.alibaba.druid.proxy.jdbc.StatementProxyImpl.execute(StatementProxyImpl.java:147)at com.alibaba.druid.pool.DruidPooledStatement.execute(DruidPooledStatement.java:619)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.ibatis.logging.jdbc.StatementLogger.invoke(StatementLogger.java:57)at com.sun.proxy.$Proxy405.execute(Unknown Source)at org.apache.ibatis.executor.statement.SimpleStatementHandler.query(SimpleStatementHandler.java:73)at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.ibatis.plugin.Invocation.proceed(Invocation.java:49)at com.didichuxing.erp.log.interceptor.LogMybatisInterceptor.intercept(LogMybatisInterceptor.java:62)at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)at com.sun.proxy.$Proxy394.query(Unknown Source)at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:136)at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)at com.sun.proxy.$Proxy394.query(Unknown Source)at tk.mybatis.mapper.mapperhelper.SelectKeyGenerator.processGeneratedKeys(SelectKeyGenerator.java:77)at tk.mybatis.mapper.mapperhelper.SelectKeyGenerator.processAfter(SelectKeyGenerator.java:63)at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:50)at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:74)at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:50)at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117)at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:76)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.ibatis.plugin.Invocation.proceed(Invocation.java:49)at com.didichuxing.erp.log.interceptor.LogMybatisInterceptor.intercept(LogMybatisInterceptor.java:62)at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)at com.sun.proxy.$Proxy394.update(Unknown Source)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:63)at com.sun.proxy.$Proxy394.update(Unknown Source)at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:198)at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:185)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)... 123 more

核心报错如下

Error selecting key or setting result to parameter object. Cause: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '?' at line 1

报错的大概意思是

为参数对象选择键或设置结果时出错。原因：java.sql.SQLSyntaxErrorException：您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册，以了解在“？”附近使用的正确语法在第 1 行

这个问题在我们线上项目偶发，大概三四天出现一次，可以说是非常折磨人。这个报错非常明确，但是找遍全网，也没找到相关的问题，这里记录一下我排查这个问题的思路，以及解决办法。

进入正文

分析日志

日志打印了三条执行sql的记录，sql看不出来问题，不知道为什么会报错。
分析源码
找到 mybatis Interceptor 这个类的实现 PageInterceptor
Interceptor 讲解去这里看

上源码

public Object intercept(Invocation invocation) throws Throwable {Object var22;try {Object[] args = invocation.getArgs();MappedStatement ms = (MappedStatement)args[0];Object parameter = args[1];RowBounds rowBounds = (RowBounds)args[2];ResultHandler resultHandler = (ResultHandler)args[3];Executor executor = (Executor)invocation.getTarget();CacheKey cacheKey;BoundSql boundSql;if (args.length == 4) {boundSql = ms.getBoundSql(parameter);cacheKey = executor.createCacheKey(ms, parameter, rowBounds, boundSql);} else {//二级缓存有数据会走到这里cacheKey = (CacheKey)args[4];boundSql = (BoundSql)args[5];}List resultList;//判断是否需要分页if (this.dialect.skip(ms, parameter, rowBounds)) {//不需要分页走这里resultList = executor.query(ms, parameter, rowBounds, resultHandler, cacheKey, boundSql);} else {String msId = ms.getId();Configuration configuration = ms.getConfiguration();Map<String, Object> additionalParameters = (Map)this.additionalParametersField.get(boundSql);//判断是否需要countif (this.dialect.beforeCount(ms, parameter, rowBounds)) {//需要count的上去了会拼上countSuffix String countMsId = msId + this.countSuffix;MappedStatement countMs = this.getExistedMappedStatement(configuration, countMsId);Long count;if (countMs != null) {count = this.executeManualCount(executor, countMs, parameter, boundSql, resultHandler);} else {countMs = (MappedStatement)this.msCountMap.get(countMsId);if (countMs == null) {countMs = MSUtils.newCountMappedStatement(ms, countMsId);this.msCountMap.put(countMsId, countMs);}//执行count的核心方法count = this.executeAutoCount(executor, countMs, parameter, boundSql, rowBounds, resultHandler);}if (!this.dialect.afterCount(count, parameter, rowBounds)) {Object var24 = this.dialect.afterPage(new ArrayList(), parameter, rowBounds);return var24;}}if (!this.dialect.beforePage(ms, parameter, rowBounds)) {resultList = executor.query(ms, parameter, RowBounds.DEFAULT, resultHandler, cacheKey, boundSql);} else {parameter = this.dialect.processParameterObject(ms, parameter, boundSql, cacheKey);//这个方法在处理sqlString pageSql = this.dialect.getPageSql(ms, boundSql, parameter, rowBounds, cacheKey);BoundSql pageBoundSql = new BoundSql(configuration, pageSql, boundSql.getParameterMappings(), parameter);Iterator var17 = additionalParameters.keySet().iterator();while(true) {if (!var17.hasNext()) {resultList = executor.query(ms, parameter, RowBounds.DEFAULT, resultHandler, cacheKey, pageBoundSql);break;}String key = (String)var17.next();pageBoundSql.setAdditionalParameter(key, additionalParameters.get(key));}}}//执行分页的核心方法var22 = this.dialect.afterPage(resultList, parameter, rowBounds);} finally {this.dialect.afterAll();}return var22;}

代码的核心语句我都加上了备注。

debug代码
我把线上报错日志的入参整到本地，想复现报错，用上了jmeter并发请求，发现不会出现任何问题（崩溃）
跟踪insertSelective 正确执行过程如下
执行先执行 install into 然后执行LAST_INSERT_ID() 获取刚刚插入的id 放入到插入的对象中

错误就是下面这段源码抛出来的，所以这里重点看了一下

    private void processGeneratedKeys(Executor executor, MappedStatement ms, Object parameter) {try {if (parameter != null && this.keyStatement != null && this.keyStatement.getKeyProperties() != null) {String[] keyProperties = this.keyStatement.getKeyProperties();Configuration configuration = ms.getConfiguration();MetaObject metaParam = configuration.newMetaObject(parameter);if (keyProperties != null) {Executor keyExecutor = configuration.newExecutor(executor.getTransaction(), ExecutorType.SIMPLE);//获取id值的核心方法List<Object> values = keyExecutor.query(this.keyStatement, parameter, RowBounds.DEFAULT, Executor.NO_RESULT_HANDLER);if (values.size() == 0) {throw new ExecutorException("SelectKey returned no data.");}if (values.size() > 1) {throw new ExecutorException("SelectKey returned more than one value.");}MetaObject metaResult = configuration.newMetaObject(values.get(0));//有结果的话下面方法把结果set到id中if (keyProperties.length == 1) {if (metaResult.hasGetter(keyProperties[0])) {this.setValue(metaParam, keyProperties[0], metaResult.getValue(keyProperties[0]));} else {this.setValue(metaParam, keyProperties[0], values.get(0));}} else {this.handleMultipleProperties(keyProperties, metaParam, metaResult);}}}} catch (ExecutorException var10) {throw var10;} catch (Exception var11) {//日志中打印的异常， 抛出的地方throw new ExecutorException("Error selecting key or setting result to parameter object. Cause: " + var11, var11);}}

源码看到这里完全发现不了问题
我仔细对比了一下执行正确和执行错误的日志，发现出错都会出现这么一行日志，我觉得问题出现在这里。

com.legal.draft.dao.mapper.ContractDraftMapper.insertSelective!selectKey_COUNT

debug许久后，我根据日志中的 _COUNT 找到核心的代码块

     //判断是否分页if (this.dialect.skip(ms, parameter, rowBounds)) {//正常的话会在这个ifresultList = executor.query(ms, parameter, rowBounds, resultHandler, cacheKey, boundSql);} else {//错误的都会走这个String msId = ms.getId();Configuration configuration = ms.getConfiguration();Map<String, Object> additionalParameters = (Map)this.additionalParametersField.get(boundSql);if (this.dialect.beforeCount(ms, parameter, rowBounds)) {//那个出现错误都会拼上_COUNT ，一行奇怪的日志让我离真相越来越近String countMsId = msId + this.countSuffix;

为什么进else里面呢一个插入方法为啥会分页，skip（是否分页）的源码如下

public boolean skip(MappedStatement ms, Object parameterObject, RowBounds rowBounds) {if (ms.getId().endsWith("_COUNT")) {throw new RuntimeException("在系统中发现了多个分页插件，请检查系统配置!");} else {//获取pagePage page = this.pageParams.getPage(parameterObject, rowBounds);if (page == null) {return true;} else {if (StringUtil.isEmpty(page.getCountColumn())) {page.setCountColumn(this.pageParams.getCountColumn());}this.autoDialect.initDelegateDialect(ms);return false;}}}

源码很简单，就是判断当前线程有没有page，就是下面这个东西

PageHelper.startPage(pageNum, pageSize);

肯定没有啊，我一个插入接口怎么会去分页，真是离了大普，于是我去查PageHelper插件的原理，发现了这么一句话。

PageHelper.startPage 方法调用后，后面必须有一个Mapper的查询方法，必须被消费掉。否则会由于ThreadLocal的原因，当该线程被其他方法调用时被分页。在文档中非常明确的写了分页插件的使用方法！！另外这不是ThreadLocal引起的问题，是使用不当！

我豁然大悟，于是写了个测试接口。

    /*** 变更* @param* @return*/@PostMapping("modifyDraftTemp")@EPAroundLogpublic BaseResponse<ContractVO> modifyDraft() {//开启分页PageHelper.startPage(1,1);//返回结果return BaseResponse.ok();}

在掉了几次这个测试接口以后，在调用插入insertSelective方法插入，果然问题必复现。

到这里问题已经明了，原因是项目中某个位置调用了PageHelper.startPage，但是没有被消费，因为这个page对象是放在本地线程中，ThreadLocal刚好执行了insertSelective的方法，会走到分页方法中，
处理获取刚刚插入的id时，组装出来的sql长这样。

SELECT LAST_INSERT_ID() LIMIT ?

执行的话就会报上面的sql语法的错误

知道问题原因，就很好解决了。
方法 1 ：找到项目中没有被消费的PageHelper.startPage的地方，优化掉代码。（我看了一下我们项目好几十处，太恐怖）
方法 2 ：在插入语句前加 PageHelper.clearPage() （治标不治本，但是好使，我又懒，我用的2）

        //如果别的线程有未消费的分页，会导致这里插入报错PageHelper.clearPage();if (contractDraftMapper.insertSelective(contractDraft) != 1) {return null;}

搞定。

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