IT俱乐部 Java Mybatis执行SQL时多了一个limit的问题及解决方法

Mybatis执行SQL时多了一个limit的问题及解决方法

发布: 2023年 2月 2日 147阅读

报错

check the manual that corresponds to your MySQL server version for the right syntax to use near ‘LIMIT 10’ at line 5

代码如下：

mapper层方法：

List select(@Param("pageNum") Integer pageNum, @Param("pageSize") Integer pageSize);

xml代码：

完整报错如下：

### Error querying database.  Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: 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 ‘LIMIT 10’ at line 5
### The error may exist in class path resource [mapper/test.xml]
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: SELECT id  FROM test LIMIT ?, ? LIMIT ?
### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: 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 ‘LIMIT 5’ at line 5
; bad SQL grammar []; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: 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 ‘LIMIT 10’ at line 5，位置信息：org.
springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:231)org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73)
org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:73)
org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)
com.sun.proxy.$Proxy122.selectList(Unknown Source)
org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:230)
org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:137)
org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:75)
org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)
com.sun.proxy.$Proxy145.selectIdByDesc(Unknown Source)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
com.sun.proxy.$Proxy146.select(Unknown Source)

sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:110)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Thread.java:748)

原因

查看执行流程会发现：

Mybatis拦截器方法识别到配置中参数supportMethodsArguments 为ture时会分页处理。

源码如下：

//是否支持接口参数来传递分页参数，默认false
private boolean supportMethodsArguments = false;

/**
 * Mybatis拦截器方法
 *
 * @param invocation 拦截器入参
 * @return 返回执行结果
 * @throws Throwable 抛出异常
 */
private Object _processPage(Invocation invocation) throws Throwable {
    final Object[] args = invocation.getArgs();
    Page page = null;
    //支持方法参数时，会先尝试获取Page
    if (supportMethodsArguments) {
        page = getPage(args);
    }
    //分页信息
    RowBounds rowBounds = (RowBounds) args[2];
    //支持方法参数时，如果page == null就说明没有分页条件，不需要分页查询
    if ((supportMethodsArguments && page == null)
            //当不支持分页参数时，判断LocalPage和RowBounds判断是否需要分页
            || (!supportMethodsArguments && SqlUtil.getLocalPage() == null && rowBounds == RowBounds.DEFAULT)) {
        return invocation.proceed();
    } else {
        //不支持分页参数时，page==null，这里需要获取
        if (!supportMethodsArguments && page == null) {
            page = getPage(args);
        }
        return doProcessPage(invocation, page, args);
    }
}

/**
 * 对象中获取分页参数
 *
 * @param params
 * @return
 */
public static  Page getPageFromObject(Object params) {
    int pageNum;
    int pageSize;
    MetaObject paramsObject = null;
    if (params == null) {
        throw new NullPointerException("无法获取分页查询参数!");
    }
    if (hasRequest && requestClass.isAssignableFrom(params.getClass())) {
        try {
            paramsObject = SystemMetaObject.forObject(getParameterMap.invoke(params, new Object[]{}));
        } catch (Exception e) {
            //忽略
        }
    } else {
        paramsObject = SystemMetaObject.forObject(params);
    }
    if (paramsObject == null) {
        throw new NullPointerException("分页查询参数处理失败!");
    }
    Object orderBy = getParamValue(paramsObject, "orderBy", false);
    boolean hasOrderBy = false;
    if (orderBy != null && orderBy.toString().length() > 0) {
        hasOrderBy = true;
    }
    try {
        Object _pageNum = getParamValue(paramsObject, "pageNum", hasOrderBy ? false : true);
        Object _pageSize = getParamValue(paramsObject, "pageSize", hasOrderBy ? false : true);
        if (_pageNum == null || _pageSize == null) {
            Page page = new Page();
            page.setOrderBy(orderBy.toString());
            page.setOrderByOnly(true);
            return page;
        }
        pageNum = Integer.parseInt(String.valueOf(_pageNum));
        pageSize = Integer.parseInt(String.valueOf(_pageSize));
    } catch (NumberFormatException e) {
        throw new IllegalArgumentException("分页参数不是合法的数字类型!");
    }
    Page page = new Page(pageNum, pageSize);
    //count查询
    Object _count = getParamValue(paramsObject, "count", false);
    if (_count != null) {
        page.setCount(Boolean.valueOf(String.valueOf(_count)));
    }
    //排序
    if (hasOrderBy) {
        page.setOrderBy(orderBy.toString());
    }
    //分页合理化
    Object reasonable = getParamValue(paramsObject, "reasonable", false);
    if (reasonable != null) {
        page.setReasonable(Boolean.valueOf(String.valueOf(reasonable)));
    }
    //查询全部
    Object pageSizeZero = getParamValue(paramsObject, "pageSizeZero", false);
    if (pageSizeZero != null) {
        page.setPageSizeZero(Boolean.valueOf(String.valueOf(pageSizeZero)));
    }
    return page;
}

解决

方式一：

在执行的sql中，不要使用pageSize和pageNum命名，可以换成startIndex和maxCount。

方式二：

修改配置参数为false

pagehelper.supportMethodsArguments=false

方式三：

如果不是因为配置参数问题，有可能是Page缓存问题导致：
解决方式：
执行sql之前调用PgageHelper.clearPage()清理一下page缓存。

PgageHelper.clearPage()；

到此这篇关于Mybatis执行SQL时多了一个limit的文章就介绍到这了,更多相关Mybatis执行SQL多一个limit内容请搜索IT俱乐部以前的文章或继续浏览下面的相关文章希望大家以后多多支持IT俱乐部！

本文收集自网络，不代表IT俱乐部立场，转载请注明出处。https://www.2it.club/code/java/4945.html
16赞
标签:
上一篇
下一篇

相关推荐

联系我们

联系我们

在线咨询: QQ交谈

邮箱: 1120393934@qq.com

工作时间：周一至周五，9:00-17:30，节假日休息

关注微信
微信扫一扫关注我们

微信扫一扫关注我们

返回顶部