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mybatis mapper namespace

2024-08-11 04:24:17   220人阅读

http://www.mybatis.org/mybatis-3/zh/sqlmap-xml.html#insert_update_and_delete

org.apache.ibatis.exceptions.PersistenceException: ### Error querying database.  Cause: org.apache.ibatis.executor.ExecutorException: No constructor found in tk.mybatis.springboot.model.Course matching [java.lang.Integer, java.lang.String]### The error may exist in mapper/CourseMapper.xml### The error may involve tk.mybatis.springboot.mapper.CourseMapper.selectAll### The error occurred while handling results### SQL: select * from course### Cause: org.apache.ibatis.executor.ExecutorException: No constructor found in tk.mybatis.springboot.model.Course matching [java.lang.Integer, java.lang.String]    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:122)    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:113)    at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:122)    at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:64)    at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)    at com.sun.proxy.$Proxy6.selectAll(Unknown Source)

 

 

 

org.apache.ibatis.jdbc.RuntimeSqlException: Error executing: create TABLE course (id INTEGER ,NAME VARCHAR(20)).  Cause: org.apache.ibatis.jdbc.RuntimeSqlException: Line missing end-of-line terminator (;) => create TABLE course (id INTEGER ,NAME VARCHAR(20))    at org.apache.ibatis.jdbc.ScriptRunner.executeLineByLine(ScriptRunner.java:141)    at org.apache.ibatis.jdbc.ScriptRunner.runScript(ScriptRunner.java:101)

 

 

 

org.apache.ibatis.binding.BindingException: Type interface tk.mybatis.springboot.mapper.CourseMapper is not known to the MapperRegistry.    at org.apache.ibatis.binding.MapperRegistry.getMapper(MapperRegistry.java:47)    at org.apache.ibatis.session.Configuration.getMapper(Configuration.java:689)    at org.apache.ibatis.session.defaults.DefaultSqlSession.getMapper(DefaultSqlSession.java:250)

mybatis中定义行为的接口，需要在xml文件中注册：

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" ><mapper namespace="tk.mybatis.springboot.mapper.CourseMapper">

问题背景：

在Dao中使用MyBatis进行查询操作，参数是传的一个List：studentNameList，但是在执行查询的时候报错，具体日志如下：

Shell代码 技术分享
  1. com.chenzhou.base.mybatis.IbatisSystemException: SqlSession operation; nested exception is org.apache.ibatis.exceptions.PersistenceException:
  2. ### Error querying database. Cause: org.apache.ibatis.binding.BindingException: Parameter ‘studentNameList‘ not found. Available parameters are [list]
  3. ### Cause: org.apache.ibatis.binding.BindingException: Parameter ‘studentNameList‘ not found. Available parameters are [list]
  4. at com.chenzhou.base.mybatis.SqlSessionTemplate.wrapException(SqlSessionTemplate.java:341)
  5. at com.chenzhou.base.mybatis.SqlSessionTemplate.execute(SqlSessionTemplate.java:127)
  6. at com.chenzhou.base.mybatis.SqlSessionTemplate.execute(SqlSessionTemplate.java:106)
  7. at com.chenzhou.base.mybatis.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:138)
  8. at com.chenzhou.dao.GenericMybatisDao.count(GenericMybatisDao.java:306)
  9. at com.chenzhou.cds.ps.dao.impl.StudentDao.getStudentCount(StudentDao.java:42)
  10. at com.chenzhou.cds.ps.dao.impl.StudentDao$$FastClassByCGLIB$$8819e766.invoke(<generated>)
  11. at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191)
  12. at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:689)
  13. at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
  14. at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:80)
  15. at com.chenzhou.util.LogUtil.doMethodInfo(LogUtil.java:85)
  16. at com.chenzhou.util.LogUtil.doDebugMethodLog(LogUtil.java:36)
  17. at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  18. at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  19. at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  20. at java.lang.reflect.Method.invoke(Method.java:597)
  21. at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:621)
  22. at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:610)
  23. at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:65)
  24. at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
  25. at org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:55)
  26. at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
  27. at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
  28. at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
  29. at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:90)
  30. at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
  31. at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:622)
  32. at com.chenzhou.cds.ps.dao.impl.StudentDao$$EnhancerByCGLIB$$d4fcf513.getStudentCount(<generated>)
  33. at com.chenzhou.ps.dao.StudentDaoTest.testgetStudentCount(StudentDaoTest.java:44)
  34. ……

单元测试用例代码如下：

Java代码 技术分享
  1. @Test
  2. public void testgetStudentCount(){
  3. List<String> studentNameList = new ArrayList<String>();
  4. studentNameList.add("chenzhou");
  5. studentNameList.add("zhangsan");
  6. studentNameList.add("lisi");
  7. int count = studentDao.getStudentCount(studentNameList);
  8. System.out.println(count);
  9. }

studentDao中的getStudentCount方法代码如下：

Java代码 技术分享
  1. public int getStudentCount(List<String> studentNameList){
  2. return super.count("getStudentCount", studentNameList);
  3. }

MyBatis mapper.xml定义如下：

<!-- 查询学生数量  -->  <select id="Student.getStudentCount" parameterType="java.util.List" resultType="java.lang.Integer">     <![CDATA[    SELECT        COUNT(*)    FROM        t_student WHERE 1=1     ]]>     <if test="studentNameList != null">          AND student_name in          <foreach collection="studentNameList" item="item" open="(" separator="," close=")">              #{item}           </foreach>      </if>  </select>

 

根据报错日志分析，是MyBatis在解析xml时找不到其中声明的studentNameList，但是在Dao中明明传的参数就是studentNameList，怎么会报错呢?

查询了一下MyBatis官方的说明文档，终于找到了原因，在http://mybatis.github.io/mybatis-3/zh/dynamic-sql.html#foreach里有一段说明：

写道
注意 你可以传递一个 List 实例或者数组作为参数对象传给 MyBatis。
当你这么做的时 候,MyBatis 会自动将它包装在一个 Map 中,用名称在作为键。
List 实例将会以“list” 作为键,
而数组实例将会以“array”作为键。

因为我传的参数只有一个，而且传入的是一个List集合，所以mybatis会自动封装成Map<"list",studentNameList>。在解析的时候会通过“list”作为Map的key值去寻找。但是我在xml中却声明成studentNameList了，所以自然会报错找不到。

 

解决办法：

第一种就是修改mapper.xml中foreach标签内容，把studentNameList修改为list

<if test="list != null">      AND student_name in      <foreach collection="list" item="item" open="(" separator="," close=")">          #{item}       </foreach>  </if>

 

不过这种方式我个人不太建议，因为以后如果要扩展该方法，增加集合参数的时候，还得修改xml中的内容。

 

第二种方式，修改dao中的参数传入方式，手动封装成map，然后把map当参数传进去

Dao方法修改为：

public int getStudentCount(List<String> studentNameList){       //把参数手动封装在Map中       Map<String, Object> map = new HashMap<String, Object>();       map.put("studentNameList", studentNameList);       return super.count("getStudentCount", map);   }

 

然后修改mapper.xml中的parameterType类型为Map

<!--注意下面的parameterType类型必须修改为Map类型,foreach中引用的List名称不用改变-->  <select id="Student.getStudentCount" parameterType="java.util.Map" resultType="java.lang.Integer">     <![CDATA[    SELECT        COUNT(*)    FROM        t_student WHERE 1=1     ]]>     <if test="studentNameList != null">          AND student_name in          <foreach collection="studentNameList" item="item" open="(" separator="," close=")">              #{item}           </foreach>      </if>  </select>

 

修改完后，重新执行了一下测试用例，测试通过。

 http://www.cnblogs.com/winkey4986/p/3480328.html

 

mybatis mapper namespace


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