mybatis使用foeach批量删除报Parameter ‘array‘ not found. Available parameters are [collection, list]

当我们要使用foreach标签根据表的任何内容批量操作数据库的数据的时候会出现这样的问题

DAO层的映射接口

 int deleteByBookIds(List list);

对应实现xml文件中

   <delete id="deleteByBookIds"  parameterType="java.util.List">
     delete from t_book where book_id in
    <foreach collection="array" item="bid" open="(" separator="," close=")">
    #{bid}
    </foreach>
</delete>

测试类

@Test
    public void forea() {
        List list=new ArrayList();
        list.add(3);
        list.add(4);
        list.add(5);
        int i = bookMapper.deleteByBookIds(list);
        System.out.println(i);
    }

这样写的代码看起来是没有什么问题的了,然后直接运行得到这样的一个结果

org.apache.ibatis.exceptions.PersistenceException: 
### Error updating database.  Cause: org.apache.ibatis.binding.BindingException: Parameter 'array' not found. Available parameters are [collection, list]
### Cause: org.apache.ibatis.binding.BindingException: Parameter 'array' not found. Available parameters are [collection, list]

	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.delete(DefaultSqlSession.java:213)
	at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:67)
	at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)
	at com.sun.proxy.$Proxy27.deleteByBookIds(Unknown Source)
	at com.zking.ssm1.service.impl.BookServiceImplTest.forea(BookServiceImplTest.java:74)
	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.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	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.binding.BindingException: Parameter 'array' not found. Available parameters are [collection, list]
	at org.apache.ibatis.session.defaults.DefaultSqlSession$StrictMap.get(DefaultSqlSession.java:343)
	at org.apache.ibatis.scripting.xmltags.DynamicContext$ContextAccessor.getProperty(DynamicContext.java:115)
	at org.apache.ibatis.ognl.OgnlRuntime.getProperty(OgnlRuntime.java:2671)
	at org.apache.ibatis.ognl.ASTProperty.getValueBody(ASTProperty.java:114)
	at org.apache.ibatis.ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
	at org.apache.ibatis.ognl.SimpleNode.getValue(SimpleNode.java:258)
	at org.apache.ibatis.ognl.Ognl.getValue(Ognl.java:470)
	at org.apache.ibatis.ognl.Ognl.getValue(Ognl.java:434)
	at org.apache.ibatis.scripting.xmltags.OgnlCache.getValue(OgnlCache.java:44)
	at org.apache.ibatis.scripting.xmltags.ExpressionEvaluator.evaluateIterable(ExpressionEvaluator.java:43)
	at org.apache.ibatis.scripting.xmltags.ForEachSqlNode.apply(ForEachSqlNode.java:55)
	at org.apache.ibatis.scripting.xmltags.MixedSqlNode.apply(MixedSqlNode.java:33)
	at org.apache.ibatis.scripting.xmltags.DynamicSqlSource.getBoundSql(DynamicSqlSource.java:41)
	at org.apache.ibatis.mapping.MappedStatement.getBoundSql(MappedStatement.java:292)
	at org.apache.ibatis.executor.statement.BaseStatementHandler.<init>(BaseStatementHandler.java:64)
	at org.apache.ibatis.executor.statement.PreparedStatementHandler.<init>(PreparedStatementHandler.java:40)
	at org.apache.ibatis.executor.statement.RoutingStatementHandler.<init>(RoutingStatementHandler.java:46)
	at org.apache.ibatis.session.Configuration.newStatementHandler(Configuration.java:558)
	at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:48)
	at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117)
	at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:76)
	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.apache.ibatis.plugin.Plugin.invoke(Plugin.java:63)
	at com.sun.proxy.$Proxy26.update(Unknown Source)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:198)
	... 29 more

给我的结果是说Parameter ‘array’ not found,不存在array这个值
通过查找对应的文档知道,是因为这个原因
因为 传递一个 List 实例或者数组作为参数对象传给 MyBatis,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
接着我恢复了之前发生错误的环境,把xml中的foreach中的collection改成了list,其他的都没改,没有报错,也可以删除成功了。

 <delete id="deleteByBookIds"  parameterType="java.util.List">
     delete from t_book where book_id in
    <foreach collection="list" item="bid" open="(" separator="," close=")">
    #{bid}
    </foreach>
</delete>

在查找资料的过程中,还发现一个解决方案
在接口的参数前面加上注解@param,这样也能解决问题

 int deleteByBookIds(@Param("list")List list);

总结

总的来说话,出现这个问题的原因是因为对于在接口这边传参的时候会发生混乱,导致dao方法中读不到我们传过去的参数,或者会有读错读乱的显现,所有会报这个Parameter ‘array’ not found的错
解决问题的方案有两个
1、在传参的时候加上注解@Param
2、把传过来的参数改为list


原文:https://blog.csdn.net/qq_45555170/article/details/109578279
作者: @shirley