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office2011在macbook pro retina中的昄��问题

timelyxyz — Sat, 13 Oct 2012 01:53:00 GMT

2012.09.19 office for mac 2011更新�?4.2.4版本�Q�最大的变化��是解决�?ji��n)office在pro retina中的昄��问题�?/p>

��(g��)查�ƈ安装更新�?4.2.4之后�Q�我的retina中office的显�C�完全OK�?

�q�是office for mac team的官方声明链�?a title="link">link.

�q�是�|�上关于升��?4.2.4之后仍然无效的解��x(ch��ng)��法的链接link2.

timelyxyz 2012-10-13 09:53 发表评论

union intersect

timelyxyz — Thu, 11 Oct 2012 13:15:00 GMT

�q��Q�Set1 union Set2

交集�Q�Set1 intersect Set2

timelyxyz 2012-10-11 21:15 发表评论

兌��表sql update

timelyxyz — Wed, 10 Oct 2012 03:36:00 GMT

正确语句

1 update jytuser set userid=(select member.userid from member where member.id=jytuser.owner_id�Q?/div>

�?个易错点�Q?nbsp;

1�Q�表自关联好像行不通。我猜想�?x��)不会(x��)和查询时徏立的索引更改有关�?/p>

2�Q�这�U�写法postgres不支�?/p>

1 update jytuser,member set jytuser.userid=member.userid where jytuser.owner_id=jmember.id and jytuser.userid=0;

报错如下�Q?/p>

timelyxyz 2012-10-10 11:36 发表评论

Add Microsoft SQL JDBC driver to Maven

timelyxyz — Tue, 09 Oct 2012 06:40:00 GMT

最�q�在做数据同步的��目�Q�过�E�中接触�?ji��n)spring+jdbc的开发模�?IDE: sts)�Q�然后开始��用maven��理��目。目前碰到的一个问题是在本地添加一个repository�Q�加的是用于�q�接sqlserver的驱动包sqljdbc4.jar。我在很多maven仓库里都没找到这个jar�Q�只能手动的下蝲来，然后��d��到本��C��库里。发现这个包好像很多人没有添加成功，我在�q�里扑ֈ��?ji��n)解��x(ch��ng)��?a title="http://claude.betancourt.us/add-microsoft-sql-jdbc-driver-to-maven/">http://claude.betancourt.us/add-microsoft-sql-jdbc-driver-to-maven/�?/p>

主要步骤如下�Q?/p>

1. 本地下蝲sqljdbc4.jar

2. 解压到本地文件夹中，�q�找到sqljdbc4.jar路径

3. 打开命��o(h��)�H�口�Q�执行以下语句（前提�Q�先配置好maven环境变量�Q?/p>

1 C:\Users\nbxyz>mvn install:install-file -Dfile=e:\sqljdbc4.jar -DgroupId=com.microsoft.sqlserver -DartifactId=sqljdbc4 -Dversion=4.0 -Dpackaging=jar

4."BUILD SUCCESS"��x(ch��ng)��加成�?/p>

生成的pom文�g如下

1 xml version="1.0" encoding="UTF-8"?>
2 <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
4   <modelVersion>4.0.0modelVersion>
5   <groupId>com.microsoft.sqlservergroupId>
6   <artifactId>sqljdbc4artifactId>
7   <version>4.0version>
8   <description>POM was created from install:install-filedescription>
9 project>

timelyxyz 2012-10-09 14:40 发表评论

timelyxyz — Wed, 26 Sep 2012 01:34:00 GMT

1     private static Map getPictureHeightAndWidthMap(String picUrl) {
2         Map map = new HashMap();
3         try {
4             URL url = new URL(picUrl);
5             HttpURLConnection connection = (HttpURLConnection) url
6                     .openConnection();
7             DataInputStream in = new DataInputStream(
8                     connection.getInputStream());
9             BufferedImage image = ImageIO.read(in);
10             map.put("w", image.getWidth() * 1L);
11             map.put("h", image.getHeight() * 1L);
12             connection.disconnect();
13             in.close();
14         } catch (IOException e) {
15             e.printStackTrace();
16         }
17         return map;
18     }
19
20     public static Long getHeight(String picUrl) {
21         Map map = getPictureHeightAndWidthMap(picUrl);
22         return null == map.get("h") ? 0 : map.get("h");
23     }
24
25     public static Long getWidth(String picUrl) {
26         Map map = getPictureHeightAndWidthMap(picUrl);
27         return null == map.get("w") ? 0 : map.get("w");
28     }

timelyxyz 2012-09-26 09:34 发表评论

timelyxyz — Sat, 22 Sep 2012 10:27:00 GMT

Do "Show package contents" on the Eclipse.app.

Edit Contents/Info.plist.

Just above

Place this:

NSHighResolutionCapable

Then, log out or make a copy of the app so that OSX will notice the change.  Now, the info window will not show "Open in Low Resolution" as checked.  Launch Eclipse and enjoy your new retina awesomeness.

solution from https://bugs.eclipse.org/bugs/show_bug.cgi?id=382972

同样的方法也可以解决的��Y件有:Spring tool suites.

timelyxyz 2012-09-22 18:27 发表评论

timelyxyz — Sat, 22 Sep 2012 09:14:00 GMT

1 首先查看PATH

命��o(h��)�Q?PATH　　

2 如何讄��PATH

命��o(h��)�Q�echo "export PATH=xxxxxx:$PATH" >> ~/.bash_profile

解释�Q�把"export PATH=xxxxxx:$PATH"输出打印到~/.bash_profile中去�?/div>

3 Unix知识补充�Q�~/.bash_profile介绍

mac和linux�l�端一般用bash来进行解析。当bash在读完了(ji��n)整体环境变量�?etc/profile�q�借此调用其他配置文�g后，接下来则是会(x��)��d��用户自定义的个�h配置文�g。bash��d��的文件��d��有三�U�：(x��)

~/.bash_profile 　　~/.bash_login 　　~/.profile

其实bash再启动是只读上面文�g的一个，而读取的��序则是依照上面的顺序。也��是说读到bash_profile��׃��d��面的�?ji��n)，如果bash_profile不存在，后面的才能有��Z��(x��)�?/div>

让我们来看看bash_profile里面有什么内容：(x��)

命��o(h��)�Q�cat ~/.bash_profile　

最后重启你的终端就�?x��)有刚才讄��的全局变量�?ji��n)。　

�?012.02.28更新�?/div>

最直观的方法是�Q?/div>

cd ~

open .bash_profile

�q�时候就�?x��)直接用��C��本程序打开�q�个配置文�g�Q�比在终端里那么讄��要简单直观多�?ji��n)�?/div>

要注意一炚w��是配置文�g里的变量是会(x��)覆盖的，比如

export PATH=1

export PATH=2

那么后面�?�?x��)把前面�?覆盖的�?/div>

timelyxyz 2012-09-22 17:14 发表评论

关于hibernate的left join

timelyxyz — Tue, 18 Sep 2012 05:47:00 GMT

hibernate默认的，以及(qi��ng)�|�络上的��L��支持left join的表关系是one-to-many的，可以使用left join fetch(需要配�|�lazy="true" fetch="select")�Q�也可以使用Criteria或者CriteriaQuery(link1 link2)来进行查询�?/p>

对于many-to-one�Q�首先我们先��Z��个model�Q?/p>

@Entity

public class ClassOne {

public String id;

public boolean isDeleted;

}

@Entity

public class ClassTwo {

public String id;

@ManyToOne

public ClassOne classOne; // 父表

public boolean isDeleted;

}

目前有两个需求：(x��)

�Q?�Q�select a.id,b.id from ClassTwo as b left join b.classOne as a;【正��，获取��C��(ji��n)所有ClassOne表的数据��V�?/p>

�Q?�Q�select a.id,count(b.id) from ClassTwo as b left join b.classOne as a where a.isDeleted=false and b.isDeleted=false group by a.id;【count�l�果中把0的��o(h��)��M��(ji��n)�Q�没辑ֈ�我的需求�?nbsp;

对于�W�二�U�，目前我还没找到具体的解决�Ҏ(gu��)��Q�仍需研究�?nbsp;

timelyxyz 2012-09-18 13:47 发表评论

hi

timelyxyz — Tue, 04 Sep 2012 02:55:00 GMT

outer-join    fetch    lazy        主键表class    ��(g��)索策�?       ��(g��)索方�?br />true/false/auto    select    false        true/false    立即��(g��)索（n+1�ơ查询）(j��)    所�?br />-        -    no-proxy/proxy    true        延迟��(g��)�?       所�?br />-        -    -        false        立即��(g��)索（n+1�ơ查询）(j��)    所�?br />-        join    false        true/false    inner join        QBC�Q�get()/load()
-        -    -        -        立即��(g��)索（n+1�ơ查询）(j��)    HQL�Q�NativeSQL
-        join    no-proxy/proxy    false        inner join        QBC�Q�get()/load()
-        -    -        -        立即��(g��)索（n+1�ơ查询）(j��)    HQL�Q�NativeSQL
-        -    -        true        inner join        QBC�Q�get()/load()
-        -    -        -        延迟��(g��)�?

String hql = "select t,count(tp) from ContentTag_Post as tp   left join fetch tp.tag as t"
   + " where tp.tag=t and t.owner.id=? "
   + " and tp.isDeleted=false and t.isDeleted=false "
   + " group by t order by t.createTime desc ";

       String hql = "select t,count(tp) from ContentTag as t left join ContentTag_Post as tp "
               + " where t.owner.id=? and t=tp.tag "
               + " and t.isDeleted=false and tp.isDeleted=false "
               + " group by t order by t.createTime desc ";

Path expected for join!
2012-08-22 12:47:37 [ERROR] Invalid path: 'tp.tag'
right-hand operand of a binary operator was null
:0:0: unexpected end of subtree
left-hand operand of a binary operator was null

select查询 join查询

@LazyToOne用法
http://docs.jboss.org/hibernate/annotations/3.4/reference/zh_cn/html/entity.html
Java中的transient�Q�volatile和strictfp关键�?
http://www.iteye.com/topic/52957
transient
Java语言的关键字�Q�用来表�C�Z��个域不是该对象串行化的一部分。当一个对象被串行化的时候，transient型变量的��g��包括在串行化的表�C�Z��Q�然而非transient型的变量是被包括�q�去�?br />

class A implements Serializable {
private String name;
transient private String address;
}

那么你在串行化（IO��等�Q�A�c�L�� l�它的name和address属性赋��|��那么你在提取A�Ӟ��拿到�?ji��n)name属性，但是却拿不到address属性�?br />

lazy是�g时的意思，如果lazy=true�Q�那么就是说数据库中兌��子表的信息在hibernate容器启动的时候不�?x��)加载，而是在你真正的访问到字表非标识字�D늚�时候，才会(x��)��d��载�?br />反之�Q�如果lazy=false的话�Q�就是说�Q�子表的信息�?x��)同主表信息同时加蝲�?br />一般用只有完全用到子表信息的时候，才会(x��)lazy=false

join 查询的时候，是用以条语句查处所有记录，包括兌��表记录，select查出的是N+1条记录，两个都是差不多的�Q�但是如果用�?ji��n)lazy=true�Q��g�q�加载的话，select在查询时只会(x��)查出主表记录�Q�也��是1�Q�如果其他地方也用到�?ji��n)数据，此时��׃�?x��)自动在执行查询，查出N�Q�可以降低内存消�?.�q�有�Q�hibernate是的session是轻量��的，创徏和销毁都不花很多资源�Q�查询数据也很快�Q�这里fetch主要赯��个作�?nbsp;

Path expected for join! unexpected end of subtree

timelyxyz 2012-09-04 10:55 发表评论