昨天遇到一个错误，之前也遇到过，但是之前遇到很快就解决了，昨天遇到这个错误当时看了大概10来分钟，还是没搞好，今天才来搞好了。
我要评论
08:34:43,302 debug getteachers:139 - ==> preparing: select a.*,b.classid,b.classname from teacherinfo a inner join classinfo b on a.teacherid=b.teacherid
08:34:43,316 debug newpooledconnection:430 - com.mchange.v2.c3p0.impl.newpooledconnection@2f187f handling a throwable.
java.sql.sqlexception: parameter index out of range (1 > number of parameters, which is 0).
at com.mysql.jdbc.sqlerror.createsqlexception(sqlerror.java:959)
at com.mysql.jdbc.sqlerror.createsqlexception(sqlerror.java:898)
at com.mysql.jdbc.sqlerror.createsqlexception(sqlerror.java:887)
at com.mysql.jdbc.sqlerror.createsqlexception(sqlerror.java:862)
at com.mysql.jdbc.preparedstatement.checkbounds(preparedstatement.java:3319)
at com.mysql.jdbc.preparedstatement.setinternal(preparedstatement.java:3304)
at com.mysql.jdbc.preparedstatement.setinternal(preparedstatement.java:3341)
at com.mysql.jdbc.preparedstatement.setnull(preparedstatement.java:3380)
at com.mchange.v2.c3p0.impl.newproxypreparedstatement.setnull(newproxypreparedstatement.java:157)
at sun.reflect.nativemethodaccessorimpl.invoke0(native method)
at sun.reflect.nativemethodaccessorimpl.invoke(unknown source)
at sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source)
at java.lang.reflect.method.invoke(unknown source)
at org.apache.ibatis.logging.jdbc.preparedstatementlogger.invoke(preparedstatementlogger.java:70)
at com.sun.proxy.$proxy34.setnull(unknown source)
at org.apache.ibatis.type.basetypehandler.setparameter(basetypehandler.java:43)
at org.apache.ibatis.scripting.defaults.defaultparameterhandler.setparameters(defaultparameterhandler.java:81)
at org.apache.ibatis.executor.statement.preparedstatementhandler.parameterize(preparedstatementhandler.java:80)
at org.apache.ibatis.executor.statement.routingstatementhandler.parameterize(routingstatementhandler.java:61)
at org.apache.ibatis.executor.simpleexecutor.preparestatement(simpleexecutor.java:74)
at org.apache.ibatis.executor.simpleexecutor.doquery(simpleexecutor.java:59)
at org.apache.ibatis.executor.baseexecutor.queryfromdatabase(baseexecutor.java:267)
at org.apache.ibatis.executor.baseexecutor.query(baseexecutor.java:137)
at org.apache.ibatis.executor.cachingexecutor.query(cachingexecutor.java:96)
at org.apache.ibatis.executor.cachingexecutor.query(cachingexecutor.java:77)
at org.apache.ibatis.session.defaults.defaultsqlsession.selectlist(defaultsqlsession.java:108)
at org.apache.ibatis.session.defaults.defaultsqlsession.selectlist(defaultsqlsession.java:102)
at sun.reflect.nativemethodaccessorimpl.invoke0(native method)
at sun.reflect.nativemethodaccessorimpl.invoke(unknown source)
at sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source)
at java.lang.reflect.method.invoke(unknown source)
at org.mybatis.spring.sqlsessiontemplate$sqlsessioninterceptor.invoke(sqlsessiontemplate.java:434)
at com.sun.proxy.$proxy15.selectlist(unknown source)
at org.mybatis.spring.sqlsessiontemplate.selectlist(sqlsessiontemplate.java:231)
at org.apache.ibatis.binding.mappermethod.executeformany(mappermethod.java:119)
at org.apache.ibatis.binding.mappermethod.execute(mappermethod.java:63)
at org.apache.ibatis.binding.mapperproxy.invoke(mapperproxy.java:52)
at com.sun.proxy.$proxy20.getteachers(unknown source)
at com.taohan.online.exam.service.impl.teacherinfoserviceimpl.getteachers(teacherinfoserviceimpl.java:59)
at com.taohan.online.exam.handler.classinfohandler.preupdateclass(classinfohandler.java:176)
at sun.reflect.nativemethodaccessorimpl.invoke0(native method)
at sun.reflect.nativemethodaccessorimpl.invoke(unknown source)
at sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source)
at java.lang.reflect.method.invoke(unknown source)
at org.springframework.web.method.support.invocablehandlermethod.doinvoke(invocablehandlermethod.java:222)
at org.springframework.web.method.support.invocablehandlermethod.invokeforrequest(invocablehandlermethod.java:137)
at org.springframework.web.servlet.mvc.method.annotation.servletinvocablehandlermethod.invokeandhandle(servletinvocablehandlermethod.java:110)
at org.springframework.web.servlet.mvc.method.annotation.requestmappinghandleradapter.invokehandlermethod(requestmappinghandleradapter.java:814)
at org.springframework.web.servlet.mvc.method.annotation.requestmappinghandleradapter.handleinternal(requestmappinghandleradapter.java:737)
at org.springframework.web.servlet.mvc.method.abstracthandlermethodadapter.handle(abstracthandlermethodadapter.java:85)
at org.springframework.web.servlet.dispatcherservlet.dodispatch(dispatcherservlet.java:959)
at org.springframework.web.servlet.dispatcherservlet.doservice(dispatcherservlet.java:893)
at org.springframework.web.servlet.frameworkservlet.processrequest(frameworkservlet.java:969)
at org.springframework.web.servlet.frameworkservlet.doget(frameworkservlet.java:860)
at javax.servlet.http.httpservlet.service(httpservlet.java:617)
at org.springframework.web.servlet.frameworkservlet.service(frameworkservlet.java:845)
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.springframework.web.filter.hiddenhttpmethodfilter.dofilterinternal(hiddenhttpmethodfilter.java:77)
at org.springframework.web.filter.onceperrequestfilter.dofilter(onceperrequestfilter.java:107)
at org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:235)
at org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:206)
at org.springframework.web.filter.characterencodingfilter.dofilterinternal(characterencodingfilter.java:121)
at org.springframework.web.filter.onceperrequestfilter.dofilter(onceperrequestfilter.java:107)
at org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:235)
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:857)
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(unknown source)
08:34:43,319 debug sqlutils:85 - attempted to convert sqlexception to sqlexception. leaving it alone. [sqlstate: s1009; errorcode: 0]
java.sql.sqlexception: parameter index out of range (1 > number of parameters, which is 0).
at com.mysql.jdbc.sqlerror.createsqlexception(sqlerror.java:959)
at com.mysql.jdbc.sqlerror.createsqlexception(sqlerror.java:898)
at com.mysql.jdbc.sqlerror.createsqlexception(sqlerror.java:887)
at com.mysql.jdbc.sqlerror.createsqlexception(sqlerror.java:862)
at com.mysql.jdbc.preparedstatement.checkbounds(preparedstatement.java:3319)
at com.mysql.jdbc.preparedstatement.setinternal(preparedstatement.java:3304)
at com.mysql.jdbc.preparedstatement.setinternal(preparedstatement.java:3341)
at com.mysql.jdbc.preparedstatement.setnull(preparedstatement.java:3380)
at com.mchange.v2.c3p0.impl.newproxypreparedstatement.setnull(newproxypreparedstatement.java:157)
at sun.reflect.nativemethodaccessorimpl.invoke0(native method)
at sun.reflect.nativemethodaccessorimpl.invoke(unknown source)
at sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source)
at java.lang.reflect.method.invoke(unknown source)
at org.apache.ibatis.logging.jdbc.preparedstatementlogger.invoke(preparedstatementlogger.java:70)
at com.sun.proxy.$proxy34.setnull(unknown source)
at org.apache.ibatis.type.basetypehandler.setparameter(basetypehandler.java:43)
at org.apache.ibatis.scripting.defaults.defaultparameterhandler.setparameters(defaultparameterhandler.java:81)
at org.apache.ibatis.executor.statement.preparedstatementhandler.parameterize(preparedstatementhandler.java:80)
at org.apache.ibatis.executor.statement.routingstatementhandler.parameterize(routingstatementhandler.java:61)
at org.apache.ibatis.executor.simpleexecutor.preparestatement(simpleexecutor.java:74)
at org.apache.ibatis.executor.simpleexecutor.doquery(simpleexecutor.java:59)
at org.apache.ibatis.executor.baseexecutor.queryfromdatabase(baseexecutor.java:267)
at org.apache.ibatis.executor.baseexecutor.query(baseexecutor.java:137)
at org.apache.ibatis.executor.cachingexecutor.query(cachingexecutor.java:96)
at org.apache.ibatis.executor.cachingexecutor.query(cachingexecutor.java:77)
at org.apache.ibatis.session.defaults.defaultsqlsession.selectlist(defaultsqlsession.java:108)
at org.apache.ibatis.session.defaults.defaultsqlsession.selectlist(defaultsqlsession.java:102)
at sun.reflect.nativemethodaccessorimpl.invoke0(native method)
at sun.reflect.nativemethodaccessorimpl.invoke(unknown source)
at sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source)
at java.lang.reflect.method.invoke(unknown source)
at org.mybatis.spring.sqlsessiontemplate$sqlsessioninterceptor.invoke(sqlsessiontemplate.java:434)
at com.sun.proxy.$proxy15.selectlist(unknown source)
at org.mybatis.spring.sqlsessiontemplate.selectlist(sqlsessiontemplate.java:231)
at org.apache.ibatis.binding.mappermethod.executeformany(mappermethod.java:119)
at org.apache.ibatis.binding.mappermethod.execute(mappermethod.java:63)
at org.apache.ibatis.binding.mapperproxy.invoke(mapperproxy.java:52)
at com.sun.proxy.$proxy20.getteachers(unknown source)
at com.taohan.online.exam.service.impl.teacherinfoserviceimpl.getteachers(teacherinfoserviceimpl.java:59)
at com.taohan.online.exam.handler.classinfohandler.preupdateclass(classinfohandler.java:176)
at sun.reflect.nativemethodaccessorimpl.invoke0(native method)
at sun.reflect.nativemethodaccessorimpl.invoke(unknown source)
at sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source)
at java.lang.reflect.method.invoke(unknown source)
at org.springframework.web.method.support.invocablehandlermethod.doinvoke(invocablehandlermethod.java:222)
at org.springframework.web.method.support.invocablehandlermethod.invokeforrequest(invocablehandlermethod.java:137)
at org.springframework.web.servlet.mvc.method.annotation.servletinvocablehandlermethod.invokeandhandle(servletinvocablehandlermethod.java:110)
at org.springframework.web.servlet.mvc.method.annotation.requestmappinghandleradapter.invokehandlermethod(requestmappinghandleradapter.java:814)
at org.springframework.web.servlet.mvc.method.annotation.requestmappinghandleradapter.handleinternal(requestmappinghandleradapter.java:737)
at org.springframework.web.servlet.mvc.method.abstracthandlermethodadapter.handle(abstracthandlermethodadapter.java:85)
at org.springframework.web.servlet.dispatcherservlet.dodispatch(dispatcherservlet.java:959)
at org.springframework.web.servlet.dispatcherservlet.doservice(dispatcherservlet.java:893)
at org.springframework.web.servlet.frameworkservlet.processrequest(frameworkservlet.java:969)
at org.springframework.web.servlet.frameworkservlet.doget(frameworkservlet.java:860)
at javax.servlet.http.httpservlet.service(httpservlet.java:617)
at org.springframework.web.servlet.frameworkservlet.service(frameworkservlet.java:845)
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.springframework.web.filter.hiddenhttpmethodfilter.dofilterinternal(hiddenhttpmethodfilter.java:77)
at org.springframework.web.filter.onceperrequestfilter.dofilter(onceperrequestfilter.java:107)
at org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:235)
at org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:206)
at org.springframework.web.filter.characterencodingfilter.dofilterinternal(characterencodingfilter.java:121)
at org.springframework.web.filter.onceperrequestfilter.dofilter(onceperrequestfilter.java:107)
at org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:235)
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:857)
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(unknown source)
08:34:43,320 debug defaultconnectiontester:126 - testing a connection in response to an exception:
java.sql.sqlexception: parameter index out of range (1 > number of parameters, which is 0).
at com.mysql.jdbc.sqlerror.createsqlexception(sqlerror.java:959)
at com.mysql.jdbc.sqlerror.createsqlexception(sqlerror.java:898)
at com.mysql.jdbc.sqlerror.createsqlexception(sqlerror.java:887)
at com.mysql.jdbc.sqlerror.createsqlexception(sqlerror.java:862)
at com.mysql.jdbc.preparedstatement.checkbounds(preparedstatement.java:3319)
at com.mysql.jdbc.preparedstatement.setinternal(preparedstatement.java:3304)
at com.mysql.jdbc.preparedstatement.setinternal(preparedstatement.java:3341)
at com.mysql.jdbc.preparedstatement.setnull(preparedstatement.java:3380)
at com.mchange.v2.c3p0.impl.newproxypreparedstatement.setnull(newproxypreparedstatement.java:157)
at sun.reflect.nativemethodaccessorimpl.invoke0(native method)
at sun.reflect.nativemethodaccessorimpl.invoke(unknown source)
at sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source)
at java.lang.reflect.method.invoke(unknown source)
at org.apache.ibatis.logging.jdbc.preparedstatementlogger.invoke(preparedstatementlogger.java:70)
at com.sun.proxy.$proxy34.setnull(unknown source)
at org.apache.ibatis.type.basetypehandler.setparameter(basetypehandler.java:43)
at org.apache.ibatis.scripting.defaults.defaultparameterhandler.setparameters(defaultparameterhandler.java:81)
at org.apache.ibatis.executor.statement.preparedstatementhandler.parameterize(preparedstatementhandler.java:80)
at org.apache.ibatis.executor.statement.routingstatementhandler.parameterize(routingstatementhandler.java:61)
at org.apache.ibatis.executor.simpleexecutor.preparestatement(simpleexecutor.java:74)
at org.apache.ibatis.executor.simpleexecutor.doquery(simpleexecutor.java:59)
at org.apache.ibatis.executor.baseexecutor.queryfromdatabase(baseexecutor.java:267)
at org.apache.ibatis.executor.baseexecutor.query(baseexecutor.java:137)
at org.apache.ibatis.executor.cachingexecutor.query(cachingexecutor.java:96)
at org.apache.ibatis.executor.cachingexecutor.query(cachingexecutor.java:77)
at org.apache.ibatis.session.defaults.defaultsqlsession.selectlist(defaultsqlsession.java:108)
at org.apache.ibatis.session.defaults.defaultsqlsession.selectlist(defaultsqlsession.java:102)
at sun.reflect.nativemethodaccessorimpl.invoke0(native method)
at sun.reflect.nativemethodaccessorimpl.invoke(unknown source)
at sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source)
at java.lang.reflect.method.invoke(unknown source)
at org.mybatis.spring.sqlsessiontemplate$sqlsessioninterceptor.invoke(sqlsessiontemplate.java:434)
at com.sun.proxy.$proxy15.selectlist(unknown source)
at org.mybatis.spring.sqlsessiontemplate.selectlist(sqlsessiontemplate.java:231)
at org.apache.ibatis.binding.mappermethod.executeformany(mappermethod.java:119)
at org.apache.ibatis.binding.mappermethod.execute(mappermethod.java:63)
at org.apache.ibatis.binding.mapperproxy.invoke(mapperproxy.java:52)
at com.sun.proxy.$proxy20.getteachers(unknown source)
at com.taohan.online.exam.service.impl.teacherinfoserviceimpl.getteachers(teacherinfoserviceimpl.java:59)
at com.taohan.online.exam.handler.classinfohandler.preupdateclass(classinfohandler.java:176)
at sun.reflect.nativemethodaccessorimpl.invoke0(native method)
at sun.reflect.nativemethodaccessorimpl.invoke(unknown source)
at sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source)
at java.lang.reflect.method.invoke(unknown source)
at org.springframework.web.method.support.invocablehandlermethod.doinvoke(invocablehandlermethod.java:222)
at org.springframework.web.method.support.invocablehandlermethod.invokeforrequest(invocablehandlermethod.java:137)
at org.springframework.web.servlet.mvc.method.annotation.servletinvocablehandlermethod.invokeandhandle(servletinvocablehandlermethod.java:110)
at org.springframework.web.servlet.mvc.method.annotation.requestmappinghandleradapter.invokehandlermethod(requestmappinghandleradapter.java:814)
at org.springframework.web.servlet.mvc.method.annotation.requestmappinghandleradapter.handleinternal(requestmappinghandleradapter.java:737)
at org.springframework.web.servlet.mvc.method.abstracthandlermethodadapter.handle(abstracthandlermethodadapter.java:85)
at org.springframework.web.servlet.dispatcherservlet.dodispatch(dispatcherservlet.java:959)
at org.springframework.web.servlet.dispatcherservlet.doservice(dispatcherservlet.java:893)
at org.springframework.web.servlet.frameworkservlet.processrequest(frameworkservlet.java:969)
at org.springframework.web.servlet.frameworkservlet.doget(frameworkservlet.java:860)
at javax.servlet.http.httpservlet.service(httpservlet.java:617)
at org.springframework.web.servlet.frameworkservlet.service(frameworkservlet.java:845)
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.springframework.web.filter.hiddenhttpmethodfilter.dofilterinternal(hiddenhttpmethodfilter.java:77)
at org.springframework.web.filter.onceperrequestfilter.dofilter(onceperrequestfilter.java:107)
at org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:235)
at org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:206)
at org.springframework.web.filter.characterencodingfilter.dofilterinternal(characterencodingfilter.java:121)
at org.springframework.web.filter.onceperrequestfilter.dofilter(onceperrequestfilter.java:107)
at org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:235)
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:857)
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(unknown source)
parameter index out of range (1 > number of parameters, which is 0)
反正就是说我的参数存在问题
修改班级信息时可以修改班级对应班主任，所以需要查询出对应的非班主任教师。
@requestmapping(value="edit/class/{classid}", method=requestmethod.get)
public modelandview preupdateclass(@pathvariable("classid") integer classid) {
logger.info("预修改班级处理");
modelandview model = new modelandview();
//获取要修改班级
classinfo classinfo = classinfoservice.getclassbyid(classid);
model.setviewname("/admin/classedit");
model.addobject("editclass", classinfo);
list<gradeinfo> grades = gradeinfoservice.getgrades();
//获取不是班主任的教师
teacher.setiswork(0); // iswork为0就不是班主任
list<teacherinfo> teachers = teacherinfoservice.getteachers(null); //通过下面配置文件可知，该方法需要传入一个 map 集合，而我这里传入一个 null
//如果没有可用班主任
if (teachers.size() == 0 || teachers == null) {
teacher.setteacherid(classinfo.getteacher().getteacherid());
teacher.setteachername("暂无剩余教师");
teachers.add(teacher);
}
model.addobject("teachers", teachers);
model.addobject("grades", grades);
return model;
}
statement会接收一个 map 集合
<resultmap type="com.taohan.online.exam.po.teacherinfo" id="getteacherresultmap">
<id column="teacherid" property="teacherid"/>
<result column="teachername" property="teachername" />
<result column="teacheraccount" property="teacheraccount"/>
<result column="teacherpwd" property="teacherpwd"/>
<result column="adminpower" property="adminpower"/>
<result column="iswork" property="iswork"/>
<association property="classinfo" javatype="com.taohan.online.exam.po.classinfo">
<id column="classid" property="classid"/>
<result column="classname" property="classname"/>
</association>
</resultmap>
<parametermap type="java.util.map" id="getteachersparametermap">
<!-- 教师对象 -->
<parameter property="teacher" resultmap="getteacherresultmap"/>
<!-- 起始位置索引 -->
<parameter property="startindex" resultmap="getteacherresultmap"/>
<!-- 每页显示数据量 -->
<parameter property="pageshow" resultmap="getteacherresultmap"/>
</parametermap>
<!-- 使用 paramentermap 查询 -->
<select id="getteachers" parametermap="getteachersparametermap" resultmap="getteacherresultmap">
select a.*,b.classid,b.classname from teacherinfo a
inner join classinfo b on a.teacherid=b.teacherid
<!--
getteachers()方法我传入的是 null，那么，在下面进行条件判断的时候并不能找到 teacher、startindex、pageshow，所以抛出异常
-->
<where>
<if test="teacher != null">
iswork=#{teacher.iswork}
</if>
</where>
<if test="startindex != null and pageshow != null">
limit #{startindex}, #{pageshow}
</if>
</select>
通过之前犯过类似的错误，以及这次错误，我发现 今后只要是 parameter index out of range (1 > number of parameters, which is 0) 类似的错误大致定位在 映射文件和调用方法传入参数，
如果使用了 parametermap, resultmap，或是返回集合，就要检查参数名称和属性名称是否一致
针对使用了 parametermap 或 parametertype，需要检查传入map中的键是否存在、匹配，或传入对象是否存在指定属性
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