之前的有出错了然后想顺便问一下
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | <?xml version= "1.0" encoding= "UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd" > <configuration> <settings> <setting name= "mapUnderscoreToCamelCase" value= "true" /> </settings> <environments default = "stu" > <environment id= "stu" > <transactionManager type= "JDBC" /> <dataSource type= "POOLED" > <property name= "driver" value= "com.mysql.jdbc.Driver" /> <property name= "url" value= "jdbc:mysql://localhost:3306/imooc?useUnicode=true&characterEncoding=UTF-8" /> <property name= "username" value= "root" /> <property name= "password" value= "ccc980916" /> </dataSource> </environment> </environments> <mappers> <mapper resource= "mappers/student.xml" /> </mappers> </configuration> <?xml version= "1.0" encoding= "UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace= "student" > <select id= "selectAll" resultType= "com.imooc.entity.Student" > select * from student order by reg_no; </select> </mapper> package com.imooc; import com.imooc.entity.Student; import com.imooc.utils.MybatisUtils; import org.apache.ibatis.session.SqlSession; import org.junit.Test; import java.util.List; public class WorkTest { @Test public void selectAll() throws Exception { SqlSession sqlSession = null ; try { sqlSession = MybatisUtils.openSession(); List<Student> list = sqlSession.selectList( "student.selectAll" ); System.out.println( "用户编号" + " " + "学号" + " " + "姓名" + " " + "年龄" + " " + "性别" + " " + "年级" + " " + "专业" ); for (Student s : list ){ System.out.println(s.getId()+ " " +s.getReg_no()+ " " +s.getName()+ " " +s.getAge()+ " " +s.getSex()+ " " +s.getGrade()+ " " +s.getMajor()); } } catch (Exception e) { throw e; } finally { MybatisUtils.closeSession(sqlSession); } } } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | <?xml version= "1.0" encoding= "UTF-8" ?> <project xmlns= "http://maven.apache.org/POM/4.0.0" xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation= "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" > <modelVersion> 4.0 . 0 </modelVersion> <groupId>com.imooc</groupId> <artifactId>mybatisWork</artifactId> <version> 1.0 -SNAPSHOT</version> <repositories> <repository> <id>aliyun</id> <name>aliyun</name> <url>https: //maven.aliyun.com/repository/public</url> </repository> </repositories> <dependencies> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version> 3.5 . 1 </version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version> 5.1 . 47 </version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version> 4.12 </version> </dependency> </dependencies> </project> package com.imooc.utils; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import java.io.IOException; import java.io.Reader; public class MybatisUtils { private static SqlSessionFactory sqlSessionFactory = null ; static { Reader reader = null ; try { reader = Resources.getResourceAsReader( "mybatis-config.xml" ); sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader); } catch (Exception e){ e.printStackTrace(); throw new ExceptionInInitializerError(); } } public static SqlSession openSession(){ return sqlSessionFactory.openSession(); } public static void closeSession(SqlSession sqlSession){ if (sqlSession != null ) { sqlSession.close(); } } } package com.imoo |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 | org.apache.ibatis.exceptions.PersistenceException: ### Error building SqlSession. ### The error may exist in mappers/student.xml ### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'mappers/student.xml' . Cause: org.apache.ibatis.builder.BuilderException: Error resolving class . Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.imooc.mybatis.entity' . Cause: java.lang.ClassNotFoundException: Cannot find class : com.imooc.mybatis.entity at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java: 30 ) at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java: 52 ) at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java: 36 ) at com.imooc.utils.MybatisUtils.<clinit>(MybatisUtils.java: 18 ) at com.imooc.WorkTest.selectAll(WorkTest.java: 16 ) 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.junit.runner.JUnitCore.run(JUnitCore.java: 137 ) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java: 68 ) at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java: 33 ) at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java: 230 ) at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java: 58 ) Caused by: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'mappers/student.xml' . Cause: org.apache.ibatis.builder.BuilderException: Error resolving class . Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.imooc.mybatis.entity' . Cause: java.lang.ClassNotFoundException: Cannot find class : com.imooc.mybatis.entity at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java: 121 ) at org.apache.ibatis.builder.xml.XMLConfigBuilder.parse(XMLConfigBuilder.java: 98 ) at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java: 50 ) ... 25 more Caused by: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'mappers/student.xml' . Cause: org.apache.ibatis.builder.BuilderException: Error resolving class . Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.imooc.mybatis.entity' . Cause: java.lang.ClassNotFoundException: Cannot find class : com.imooc.mybatis.entity at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java: 122 ) at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java: 94 ) at org.apache.ibatis.builder.xml.XMLConfigBuilder.mapperElement(XMLConfigBuilder.java: 373 ) at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java: 119 ) ... 27 more Caused by: org.apache.ibatis.builder.BuilderException: Error resolving class . Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.imooc.mybatis.entity' . Cause: java.lang.ClassNotFoundException: Cannot find class : com.imooc.mybatis.entity at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java: 118 ) at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java: 76 ) at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java: 137 ) at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java: 130 ) at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java: 120 ) ... 30 more Caused by: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.imooc.mybatis.entity' . Cause: java.lang.ClassNotFoundException: Cannot find class : com.imooc.mybatis.entity at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java: 120 ) at org.apache.ibatis.builder.BaseBuilder.resolveAlias(BaseBuilder.java: 149 ) at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java: 116 ) ... 34 more Caused by: java.lang.ClassNotFoundException: Cannot find class : com.imooc.mybatis.entity at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java: 200 ) at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java: 89 ) at org.apache.ibatis.io.Resources.classForName(Resources.java: 261 ) at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java: 116 ) ... 36 more java.lang.NoClassDefFoundError: Could not initialize class com.imooc.utils.MybatisUtils at com.imooc.WorkTest.selectAll(WorkTest.java: 25 ) 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.junit.runner.JUnitCore.run(JUnitCore.java: 137 ) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java: 68 ) at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java: 33 ) at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java: 230 ) at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java: 58 ) Process finished with exit code - 1 |
9
收起
正在回答
3回答
dobe001
2020-02-24 16:34:46
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | package com.imooc.entity; public class Student { private int id; private int reg_no; private String name; private String sex; private int age; private String grade; private String major; public int getId() { return id; } public void setId( int id) { this .id = id; } public int getReg_no() { return reg_no; } public void setReg_no( int reg_no) { this .reg_no = reg_no; } public String getName() { return name; } public void setName(String name) { this .name = name; } public String getSex() { return sex; } public void setSex(String sex) { this .sex = sex; } public int getAge() { return age; } public void setAge( int age) { this .age = age; } public String getGrade() { return grade; } public void setGrade(String grade) { this .grade = grade; } public String getMajor() { return major; } public void setMajor(String major) { this .major = major; } } |
3. Java 数据库开发与实战应用
- 参与学习 人
- 提交作业 357 份
- 解答问题 8016 个
本阶段将带你学习MySQL数据库,JDBC接口,MyBatis框架等,带你掌握的数据的存放和管理。
了解课程
恭喜解决一个难题,获得1积分~
来为老师/同学的回答评分吧