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

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

如果这个还没有解决问题的话，可以参考一下我后面在编写的时候又出现的一个问题https://blog.csdn.net/qq_45555170/article/details/109578279

本文地址：https://blog.csdn.net/qq_45555170/article/details/109576959