解决mybatis使用foreach批量insert异常的问题

异常

org.springframework.jdbc.BadSqlGrammarException: 
### Error updating 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 'INSERT INTO t_user_role(userid,roleid)VALUES(1,3)
		 ; 
			INSERT INTO t_user_ro' at line 3
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: INSERT INTO t_user_role(userid,roleid)VALUES(?,?) ;  INSERT INTO t_user_role(userid,roleid)VALUES(?,?) ;  INSERT INTO t_user_role(userid,roleid)VALUES(?,?)
### 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 'INSERT INTO t_user_role(userid,roleid)VALUES(1,3)
		 ; 
			INSERT INTO t_user_ro' at line 3
; 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 'INSERT INTO t_user_role(userid,roleid)VALUES(1,3)
		 ; 
			INSERT INTO t_user_ro' at line 3
	at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:231)
	at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73)
	at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:73)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:371)
	at com.sun.proxy.$Proxy13.insert(Unknown Source)
	at org.mybatis.spring.SqlSessionTemplate.insert(SqlSessionTemplate.java:240)
	at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:51)
	at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:52)
	at com.sun.proxy.$Proxy14.addRoles(Unknown Source)
	at com.atguigu.atcrowdfunding.manager.service.impl.UserServiceImpl.addRoles(UserServiceImpl.java:139)
	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.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
	at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
	at com.sun.proxy.$Proxy17.addRoles(Unknown Source)
	at com.atguigu.atcrowdfunding.manager.controller.UserController.doAddRoles(UserController.java:271)
	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.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:175)
	at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446)
	at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:833)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
	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:108)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1526)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1482)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Unknown Source)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INSERT INTO t_user_role(userid,roleid)VALUES(1,3)
		 ; 
			INSERT INTO t_user_ro' at line 3
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
	at com.mysql.jdbc.Util.getInstance(Util.java:387)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:941)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3870)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3806)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2470)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2617)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2550)
	at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861)
	at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1192)
	at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.execute(NewProxyPreparedStatement.java:823)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:62)
	at com.sun.proxy.$Proxy24.execute(Unknown Source)
	at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:44)
	at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:69)
	at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:48)
	at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:105)
	at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:71)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:152)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:141)
	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:358)
	... 65 more

异常分析

mapper.xml导致的错误地方

 <insert id="addRoles">
 <foreach collection="data.ids" item="id" separator=";">
 INSERT INTO t_user_role(userid,roleid)VALUES(#{userId},#{id})
 </foreach>
 </insert>

异常中说

Caused by: 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 'INSERT INTO t_user_role(userid,roleid)VALUES(1,3)

首先觉得是 sql语句的问题，但是用sqlyog测试发现没有问题

后来发现是数据库对多个语句拼在一起的操作不支持问题

解决办法

在jdbcUrl中加入allowMultiQueries=true即可解决

jdbc.url=jdbc:mysql://localhost:3306/atcrowdfunding?allowMultiQueries=true&rewriteBatchedStatements=true&useUnicode=true&characterEncoding=utf8

补充：Mybatis foreach嵌套批量insert map list数据

方式一：

以Teacher和Students为例，两者为一对多关系：**

Teacher 实体类

private String tid;
private String tName;
private List<Student> studentList; 
public String getTid() {
 return tid;
}
 
public void setTid(String tid) {
 this.tid = tid;
}
 
public String gettName() {
 return tName;
}
 
public void settName(String tName) {
 this.tName = tName;
}
 
public List<Student> getStudentList() {
 return studentList;
}
 
public void setStudentList(List<Student> studentList) {
 this.studentList = studentList;
}

Student实体类

private String sid;
private String sName;
public String getSid() {
 return sid;
}
 
public void setSid(String sid) {
 this.sid = sid;
}
 
public String getsName() {
 return sName;
}
 
public void setsName(String sName) {
 this.sName = sName;
}

应用场景：在老师的service层批量插入老师数据

int nums=1000;
  
 //定义teacher list
 List<Teacher> teaList=new ArrayList<Teacher>();
 //数据是通过excel读取的 此处模拟循环读取excel row数据
 for(int rowi=0;rowi<nums;rowi++){
  Teacher teacher=new Teacher();
  teacher.settName("xxx");
 
  List<Student> stuList=new ArrayList<Student>();
  Student student=new Student();
  //此处获取Students集合
  for(xxx){
   stuList.add(student);
  }
  //把student集合和teacher绑定
  teacher.setStudentList(stuList);
 
  //把teacher放入list
  teaList.add(teacher);
 }
 // 批量插入老师数据
 teacherMapper.batchInsertTeacher(teaList);
 //此时每个teacher对象都有返回的主键id值
 //老师主键 对应一个list(学生信息) map
 Map<String,List<Student>> stuMap=new HashMap<>();
 //填入数据 老师主键一对多学生信息
 for(Teacher tea:teaList){
  //非空判断 避免老师没有对应学生的情况（此处只进行逻辑处理 不考虑现实中老师没有学生）
  if(tea.getStudentList()!=null&&tea.getStudentList().size()>0){
   stuMap.put(tea.getTid(),tea.getStudentList());
  }
 }
 //调用学生service的批量保存学生方法
 studentService.batchInsertStudent(stuMap);

student Mapper接口文件

int batchInsertStudent(@Param("stuMap") Map<String,List<Student>> stuMap);

student mapper.xml文件（写法一：）

<insert id="batchInsertStudent" parameterType="java.util.Map">
 INSERT INTO bs_student (sid,sName,tid) 
 values
 <foreach collection="stuMap.keys" index="key" item="itemKey" separator=",">
   <foreach collection="stuMap[itemKey]" index="index_list" item="list" separator="," >
    ( (select REPLACE(UUID(),'-','') AS sid) ,#{list.sName},#{itemKey} )
   </foreach>
 </foreach>
</insert>

student mapper.xml文件（写法二：）

<insert id="batchInsertStudent" >
　　INSERT INTO bs_student (sid,sName,tid)
　　<foreach collection="stuMap.keys" index="index" item="itemKey" separator="UNION ALL">
　　<foreach collection="stuMap[itemKey]" index="index_list" item="list" separator="UNION ALL">
　　　　　　（
　　　　　　SELECT 
　　　　　　(select REPLACE(UUID(),'-','') AS sid)
　　　　　　,#{list.sName}
　　　　　　,#{itemKey}
　　　　　　FROM DUAL
　　　　　　）
　　</foreach>
　　</foreach>
</insert>

stuMap：就是在接口中使用@Param(“stuMap”)标注了变量；

使用stuMap.keys可以取到所有的key，遍历。

内层循环中使用stuMap[itemKey]类似stuMap.get(“key”)取当前key对应的value值。由于value是list所以还需要遍历。

结果保存成功。再次膜拜强大的Mybatis。

至此成功插入student数据。

方式二（推荐）：

自定义类

class EnclosingType{
 private String uuid;
 private List<ElementType> elements;
}

class ElementType{
 String a;
 String b;
 (...)
}

Mapper.xml（方法一）

<mapper namespace="my.example.ElementType">
 <insert id="insertElements" parameterType="EnclosingType">
  INSERT INTO table1(enclosingTypeId,column_a,column_b)
  VALUES
  <foreach collection="elements" index="index" item="list" separator=",">  
   ( 
   #{uuid,jdbcType=VARCHAR}
   ,#{list.a,jdbcType=VARCHAR}
   ,#{list.b,jdbcType=VARCHAR}
   )
  </foreach>
 </insert>
</mapper>

Mapper.xml（方法二）

<mapper namespace="my.example.ElementType">
 <insert id="insertElements" parameterType="EnclosingType">
  INSERT INTO table1(enclosingTypeId,column_a,column_b)
  <foreach collection="elements" index="index" item="list" separator="union all">
   (
   select #{uuid,jdbcType=VARCHAR}
   ,#{list.a,jdbcType=VARCHAR}
   ,#{list.b,jdbcType=VARCHAR}
   from dual
   )
  </foreach>
 </insert>
</mapper>

以上为个人经验，希望能给大家一个参考，也希望大家多多支持自学编程网。如有错误或未考虑完全的地方，望不吝赐教。

编程技巧