近日在项目中使用SpringBoot集成PageHelper后,跑单元测试时出现了“在系统中发现了多个分页插件,请检查系统配置!”这个问题。
如下图所示:
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org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
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### Error querying database. Cause: java.lang.RuntimeException: 在系统中发现了多个分页插件,请检查系统配置!
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### Cause: java.lang.RuntimeException: 在系统中发现了多个分页插件,请检查系统配置!
-
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at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:77)
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at org.mybatis.spring.SqlSessionTemplate
$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)
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at com.sun.proxy.
$Proxy109.selectList(Unknown Source)
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at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:230)
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at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:137)
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at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:75)
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at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)
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at com.sun.proxy.
$Proxy110.selectAll(Unknown Source)
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at com.lianjia.cto.ke.broadband.service.StationInfoService.selectPage(StationInfoService.java:27)
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at com.lianjia.cto.ke.broadband.service.StationInfoService$
$FastClassBySpringCGLIB$
$ee2f34a4.invoke(<generated>)
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at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
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at org.springframework.aop.framework.CglibAopProxy
$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:738)
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at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
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at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:52)
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at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:168)
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at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
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at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
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at org.springframework.aop.framework.CglibAopProxy
$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:673)
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at com.lianjia.cto.ke.broadband.service.StationInfoService$
$EnhancerBySpringCGLIB$
$1da3a0f3.selectPage(<generated>)
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at com.lianjia.cto.ke.broadband.service.StationInfoServiceTest.selectPage(StationInfoServiceTest.java:27)
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at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
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at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
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at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
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at java.lang.reflect.Method.invoke(Method.java:498)
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at org.junit.runners.model.FrameworkMethod
$1.runReflectiveCall(FrameworkMethod.java:50)
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at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
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at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
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at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
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at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
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at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
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at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
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at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
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at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
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at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
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at org.junit.runners.ParentRunner
$3.run(ParentRunner.java:290)
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at org.junit.runners.ParentRunner
$1.schedule(ParentRunner.java:71)
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at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
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at org.junit.runners.ParentRunner.access
$000(ParentRunner.java:58)
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at org.junit.runners.ParentRunner
$2.evaluate(ParentRunner.java:268)
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at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
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at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
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at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
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at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
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at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
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at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
-
at com.intellij.rt.execution.junit.IdeaTestRunner
$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
-
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
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at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
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Caused by: org.apache.ibatis.exceptions.PersistenceException:
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### Error querying database. Cause: java.lang.RuntimeException: 在系统中发现了多个分页插件,请检查系统配置!
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### Cause: java.lang.RuntimeException: 在系统中发现了多个分页插件,请检查系统配置!
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at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
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at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)
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at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
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at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
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at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
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at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
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at java.lang.reflect.Method.invoke(Method.java:498)
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at org.mybatis.spring.SqlSessionTemplate
$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)
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... 46 more
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Caused by: java.lang.RuntimeException: 在系统中发现了多个分页插件,请检查系统配置!
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at com.github.pagehelper.PageHelper.skip(PageHelper.java:55)
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at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:92)
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at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)
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at com.sun.proxy.
$Proxy123.query(Unknown Source)
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at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
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at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
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at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
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at java.lang.reflect.Method.invoke(Method.java:498)
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at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:63)
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at com.sun.proxy.
$Proxy123.query(Unknown Source)
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at com.github.pagehelper.PageInterceptor.executeAutoCount(PageInterceptor.java:201)
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at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:113)
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at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)
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at com.sun.proxy.
$Proxy123.query(Unknown Source)
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at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
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... 52 more
先上结果:maven的pagehelper-spring-boot-starter这个依赖,提供了自动配置分页插件的功能,所以有两种方法解决这个问题
第一种,SpringBoot启动类的注解上排除这个自动配置
@SpringBootApplication(exclude = PageHelperAutoConfiguration.class)
第二种,在构建SqlSessionFactory时,不要再去手动添加分页的拦截器,在application.yml中进行配置pagehelper的属性,在SpringBoot启动时会将配置自动注入生成拦截器
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# PageHelper配置
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pagehelper:
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offsetAsPageNum:
true
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rowBoundsWithCount:
true
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reasonable:
true
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returnPageInfo:
true
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params: count=countSql
以下是解决问题的思路:
看到这个报错后,查看了一下配置,发现并没有配置多个PageHelper。于是查看了一下报错部分的源码,问题出现在一个skip方法中,如下图所示:
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public
class PageHelper extends PageMethod implements Dialect {
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//...
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@Override
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public boolean skip(MappedStatement ms, Object parameterObject, RowBounds rowBounds) {
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//此处的MSUtils.COUNT为一个常量值"_COUNT"
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if(ms.getId().endsWith(MSUtils.COUNT)){
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throw
new RuntimeException(
"在系统中发现了多个分页插件,请检查系统配置!");
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}
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//...
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}
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//...
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}
继续向上找,找到了分页插件的拦截器
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public
class PageInterceptor implements Interceptor {
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//...
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private String countSuffix =
"_COUNT";
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@Override
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public Object intercept(Invocation invocation) throws Throwable {
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try {
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//...
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//调用方法判断是否需要进行分页,如果不需要,直接返回结果
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if (!dialect.skip(ms, parameter, rowBounds)) {
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//反射获取动态参数
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String msId = ms.getId();
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Configuration configuration = ms.getConfiguration();
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Map<String, Object> additionalParameters = (Map<String, Object>) additionalParametersField.get(boundSql);
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//判断是否需要进行 count 查询
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if (dialect.beforeCount(ms, parameter, rowBounds)) {
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String countMsId = msId + countSuffix;
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Long count;
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//先判断是否存在手写的 count 查询
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MappedStatement countMs = getExistedMappedStatement(configuration, countMsId);
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if(countMs !=
null){
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count = executeManualCount(executor, countMs, parameter, boundSql, resultHandler);
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}
else {
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countMs = msCountMap.get(countMsId);
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//自动创建
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if (countMs ==
null) {
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//根据当前的 ms 创建一个返回值为 Long 类型的 ms
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countMs = MSUtils.newCountMappedStatement(ms, countMsId);
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msCountMap.put(countMsId, countMs);
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}
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count = executeAutoCount(executor, countMs, parameter, boundSql, rowBounds, resultHandler);
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}
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//处理查询总数
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//返回 true 时继续分页查询,false 时直接返回
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if (!dialect.afterCount(count, parameter, rowBounds)) {
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//当查询总数为 0 时,直接返回空的结果
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return dialect.afterPage(
new ArrayList(), parameter, rowBounds);
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}
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}
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//判断是否需要进行分页查询
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if (dialect.beforePage(ms, parameter, rowBounds)) {
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//生成分页的缓存 key
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CacheKey pageKey = cacheKey;
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//处理参数对象
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parameter = dialect.processParameterObject(ms, parameter, boundSql, pageKey);
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//调用方言获取分页 sql
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String pageSql = dialect.getPageSql(ms, boundSql, parameter, rowBounds, pageKey);
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BoundSql pageBoundSql =
new BoundSql(configuration, pageSql, boundSql.getParameterMappings(), parameter);
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//设置动态参数
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for (String key : additionalParameters.keySet()) {
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pageBoundSql.setAdditionalParameter(key, additionalParameters.get(key));
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}
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//执行分页查询
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resultList = executor.query(ms, parameter, RowBounds.DEFAULT, resultHandler, pageKey, pageBoundSql);
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}
else {
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//不执行分页的情况下,也不执行内存分页
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resultList = executor.query(ms, parameter, RowBounds.DEFAULT, resultHandler, cacheKey, boundSql);
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}
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}
else {
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//rowBounds用参数值,不使用分页插件处理时,仍然支持默认的内存分页
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resultList = executor.query(ms, parameter, rowBounds, resultHandler, cacheKey, boundSql);
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}
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return dialect.afterPage(resultList, parameter, rowBounds);
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}
finally {
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dialect.afterAll();
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}
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}
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}
可以发现以_COUNT结尾的MappedStatement.id是由分页插件的拦截器自动生成的,而这个由分页插件的生成之后,怎么会又一次的调用skip方法呢?所以猜测是有多个分页插件的拦截器影响到了。于是查阅了一下相关的资料,发现PageHelper引入了SpringBoot的自动配置,以下是自动配置的源码:
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@Configuration
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@ConditionalOnBean(SqlSessionFactory.class)
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@EnableConfigurationProperties(PageHelperProperties.class)
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@AutoConfigureAfter(MybatisAutoConfiguration.class)
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public
class PageHelperAutoConfiguration {
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@Autowired
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private List<SqlSessionFactory> sqlSessionFactoryList;
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@Autowired
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private PageHelperProperties properties;
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/**
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* 接受分页插件额外的属性
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*
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* @return
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*/
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@Bean
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@ConfigurationProperties(prefix = PageHelperProperties.PAGEHELPER_PREFIX)
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public Properties pageHelperProperties() {
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return
new Properties();
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}
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@PostConstruct
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public void addPageInterceptor() {
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PageInterceptor interceptor =
new PageInterceptor();
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Properties properties =
new Properties();
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//先把一般方式配置的属性放进去
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properties.putAll(pageHelperProperties());
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//在把特殊配置放进去,由于close-conn 利用上面方式时,属性名就是 close-conn 而不是 closeConn,所以需要额外的一步
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properties.putAll(
this.properties.getProperties());
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interceptor.setProperties(properties);
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for (SqlSessionFactory sqlSessionFactory : sqlSessionFactoryList) {
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sqlSessionFactory.getConfiguration().addInterceptor(interceptor);
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}
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}
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}
至此,问题算是比较明白了,是因为多个分页拦截器的作用,导致了该异常的出现,所以全局只要保留一个就可以了。