mybatis的自動生成密鑰的java數據類型

Question

我想插入Post域到MySQL數據庫。

後域是這樣的：

public class Post { 
    private long postId; 
    private String title; 
    String content; 
    private String pictureId; 
    private Picture picture; 
    private int authorId; 
    private User author; 
    private Date postTime; 
    private int status; 
    private int commentCount; 

}

db表是這樣創建的：

CREATE TABLE `tb_posts` (
`post_id` bigint(20) NOT NULL AUTO_INCREMENT, 
`title` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL, 
`content` varchar(2000) COLLATE utf8_unicode_ci DEFAULT NULL, 
`picture_id` varchar(250) COLLATE utf8_unicode_ci DEFAULT NULL, 
`author_id` int(11) DEFAULT NULL, 
`post_time` datetime DEFAULT NULL, 
`status` int(11) DEFAULT NULL, 
`comment_count` int(11) DEFAULT NULL, 
PRIMARY KEY (`post_id`) 
) ENGINE=InnoDB AUTO_INCREMENT=26 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci; 

MyBatis的映射是這樣的：

<insert id="insert" parameterType="post"> 

    INSERT INTO tb_posts 
    (
     title, content, picture_id, author_id, post_time, status, comment_count 
    ) VALUES 
    (
     #{title}, #{content}, #{pictureId}, #{authorId}, #{postTime}, #{status}, #{commentCount} 
    ) 
    <selectKey keyProperty="postId" resultType="long" order="BEFORE"> 
    SELECT LAST_INSERT_ID() AS postId; 
    </selectKey> 
</insert> 

我不知道爲什麼克enerated關鍵這名字是「帖子ID」總有例外，這是「java.lang.ClassCastException：java.lang.Integer中不能轉換爲java.lang.Long中的」

整個例外情況是這樣的：

java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long 
at $Proxy14.insert(Unknown Source) 
at me.joyo.mate.core.service.impl.PostServiceImpl.insert(PostServiceImpl.java:44) 
at me.joyo.mate.core.test.PostTester.insert(PostTester.java:50) 
at me.joyo.mate.core.test.PostTester.test(PostTester.java:33) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
at java.lang.reflect.Method.invoke(Method.java:597) 
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) 
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) 
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) 
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) 
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28) 
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74) 
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83) 
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72) 
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231) 
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) 
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) 
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) 
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) 
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) 
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) 
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) 
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71) 
at org.junit.runners.ParentRunner.run(ParentRunner.java:300) 
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174) 
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) 
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) 

請幫忙！

Answer 1

製造postId類型Long。我最近碰到同樣的bug在這裏看到http://code.google.com/p/mybatis/issues/detail?id=378