详细错误信息：
org.apache.ibatis.exceptions.PersistenceException: ### Error updating database. Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for studentDao.insert ### Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for studentDao.insert at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30) at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:200) at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:185) at cn.mgy.dao.impl.StudentDoImpl.insert(StudentDoImpl.java:14) at cn.mgy.test.StudentTest.insert(StudentTest.java:18) 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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206) Caused by: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for studentDao.insert at org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:860) at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:693) at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:686) at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:197) ... 26 more
解决方法：
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "mybatis-3-mapper.dtd" > 3 <mapper namespace="studnetDao"> <!--修改为 <mapper namespace="studentDao">--> 4 <insert id="insert" useGeneratedKeys="true" keyProperty="studentId"> 5 INSERT INTO tb_student(STUDENT_NAME, STUDENT_PWD) 6 VALUES (#{studentName}, #{studentPwd}) 7 </insert> 8 </mapper>
