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Sqoop&Hive�Q�解决ERROR hive.HiveConfig: Could not load org.apache.hadoop.hive.conf.HiveConf. Make sure HIVE_CONF_DIR is set correctly.

Ke — Tue, 03 Apr 2018 08:56:00 GMT

解决�Ҏ��Q?br />�?$SQOOP_HOME/lib目录下执行以下命�?br />

ln -s /app/soft/apache-hive-2.3.2-bin/lib/hive-exec-2.3.2.jar hive-exec-2.3.2.jar

Ke 2018-04-03 16:56 发表评论

旉��列�{�?amp;&动态指定分区Insert数据

Ke — Mon, 02 Apr 2018 08:47:00 GMT

--使用 from_unixtime �?unix_timestamp ��时间列转化成想要的格式
--然后再Insert表，动态指定分�?br />

insert overwrite table partition_user_table partition (dt) select id, account, name, create_time, from_unixtime(unix_timestamp(create_time,'yyyy/mm/dd'),'yyyymmdd') as dt from external_user_table;

Ke 2018-04-02 16:47 发表评论

hadoop或hbase集群重启失效节点

Ke — Fri, 30 Mar 2018 02:44:00 GMT

有时候hadoop或hbase集群�q�行旉��久了后，某些节点��׃��失效�Q�这个时候如果不想重启整个集��（�q�种情况在很多情况下已经不被允许�Q�，�q�个时候可以单独重启失效节炏V�?/span>

HADOOP�Q?br style="box-sizing: border-box;" />

hadoop中重启单节点的方法和增加新节点其实是一��L��?/div>

重启或添加节�?/strong>

$bin/hadoop-daemon.sh start datanode

当然�Q�添加的话需要copy配置文�g到新节点。重启的话先 $bin/hadoop-daemon.sh stop datanode

重新balancer(可�?

$bin/hadoop balancer

其实集群自己会balancer�Q�当然也可以像上面那��h��动balancer�Q�不然在�J�忙时段最好避免�?/span>

HBASE�Q?/strong>

重启

$bin/hbase-daemon.sh stop regionserver

$bin/hbase-daemon.sh start regionserver

也可以添加新的master�Q�默认只有一个master�Q�，
$bin/hbase-daemon.sh start master

Ke 2018-03-30 10:44 发表评论

windows下��用IDEA开�?spark SQL例子报IllegalArgumentException: java.net.URISyntaxException: Relative path in absolute URI

Ke — Wed, 21 Mar 2018 03:31:00 GMT

public class FirstSparkSql {
public static void main(String[] args) {

String masterMode = "local";//spark://master:7077

SparkConf conf = new SparkConf();
//conf.set("spark.executor.memory", "1024m");
conf.setAppName("First Spark SQL");
conf.setMaster(masterMode);
//解决异常�Q?/span>IllegalArgumentException: java.net.URISyntaxException: Relative path in absolute URI
conf.set("spark.sql.warehouse.dir","D:\\temp_files");

JavaSparkContext sc = new JavaSparkContext(conf);

SparkSession spark = SparkSession.builder().config(conf).getOrCreate();
Dataset df = spark.read().json("hdfs://master:9000/user/spark/input/persons.txt");
df.show();
sc.stop();
}
}

Ke 2018-03-21 11:31 发表评论

Ke — Wed, 16 Sep 2015 06:30:00 GMT
原文  http://blogs.oracle.com/sql/entry/ora_54033_and_the_hidden

A colleague recently asked me a question:

"I'm modifying the data type of a column. When doing so I get the following error:

ORA-54033: column to be modified is used in a virtual column expression

But there's no virtual columns defined on the table! What on earth's going on?!"

This was exceptionally confusing. Looking at the table definition we couldn't see any virtual columns defined:
create table tab ( x integer, y date, z varchar2(30) );

Sure enough, when we tried to change the data type of y we got the exception:
alter table tab modify (y timestamp); ORA-54033: column to be modified is used in a virtual column expression

How could this be?

Perhaps there was a column defined that we couldn't see. Querying user_tab_cols revealed something interesting:
select column_name, data_default, hidden_column from user_tab_cols where table_name = 'TAB'; COLUMN_NAME DATA_DEFAULT HID ------------------------------ ----------------------------- --- SYS_STUYPW88OE302TFVBNC6$MMQXE SYS_OP_COMBINED_HASH("X","Y") YES Z NO Y NO X NO

The SYS_... column isn't in the table DDL! Where does it come from? And what's SYS_OP_COMBINED_HASH all about? Has someone been mucking around with the database?

The SYS_ prefix is a sign that the column is system generated. So something's happened that's caused Oracle to create this on our behalf.

SYS_OP_COMBINED_HASH is an undocumented feature. The name implies Oracle is merging the arguments together to form a hash.

Is there a feature where we want to capture information about a group of columns?

Indeed there is -extended statistics!This feature enables to Oracle calculate statistics on a group of columns. It uses this information to improve row estimates. This is useful when there's a correlation between the values of two (or more) columns in a table.

Someone had created extended stats on this table for (x, y).

Now we've identified the problem, how do we get around it?

Simple: drop and recreate the extended stats:
exec dbms_stats.drop_extended_stats(user, 'tab', '(x, y)'); alter table tab modify (y timestamp); select dbms_stats.create_extended_stats(user, 'tab', '(x, y)') from dual; DBMS_STATS.CREATE_EXTENDED_STATS(USER,'TAB','(X,Y)') -------------------------------------------------------------------------------- SYS_STUYPW88OE302TFVBNC6$MMQXE

Success!

Extended stats are a great way to improve the optimizer's row estimates. If you need to create these, I recommend you also do the following:

Apply the extended stats to all environments
Put a comment on the columns explaining what you've done, e.g.

comment on column tab.x is 'part of extended stats. To modify data type drop and recreate stats';
These actions will help prevent future developers getting stuck tracking down the cause of "missing" virtual columns!

Ke 2015-09-16 14:30 发表评论

JQuery EasyUI combobox动态添加option(�?

Ke — Sat, 20 Sep 2014 07:59:00 GMT

�Ҏ��一�Q?/p>
1 var data, json; 2 json = '[{"id":"�q�计�?,"text":"�q�计�?,"selected":true}]'; 3 data = $.parseJSON(json); 4 $("#rwlb").combobox("loadData", data);

�Ҏ��二：

1 var data,json; 2 data = []; 3 data.push({ "text": "��试", "id": 100 }); 4 $("#rwlb").combobox("loadData", data);
转自�Q?a >http://www.cnblogs.com/easypass/archive/2012/12/29/2838329.html

Ke 2014-09-20 15:59 发表评论

转：Easyui Tree�Ҏ��扩展 - getLevel(获取节点�U�别)

Ke — Sat, 13 Sep 2014 08:12:00 GMT
原文�Q?a >http://www.jeasyuicn.com/the-extended---easyui-tree-method-getlevel-access-node-level.html

Easyui Tree一直就没有提供�q�个�Ҏ��,以前没有用到,所以一直没怎么在意,�q�次自己用到�?��Z��扩展了一个方�?分��n�l�大�?

1 $.extend($.fn.tree.methods, {

2     getLevel:function(jq,target){

3         var l = $(target).parentsUntil("ul.tree","ul");

4         return l.length+1;

5     }

6 });
用法:

1 var node = $().tree("getSelected");

2 var lv = $().tree("getLevel",node.target);

Ke 2014-09-13 16:12 发表评论

Ke — Wed, 30 Jul 2014 09:35:00 GMT

十进制与十六�q�制的�{�?br />8i以上版本�Q?/p>
十进�?->十六�q�制
select to_char(100,'XX') from dual;

十六�q�制-->十进�?br />select to_number('7D','XX') from dual;

其中XX为格式，注意XX的位��C��能小�?/span>传入的参数�?br />

Ke 2014-07-30 17:35 发表评论

JavaScript中实现函数重载和参数默认�?�?

Ke — Thu, 24 Jul 2014 01:22:00 GMT

转自�Q?a >http://www.2cto.com/kf/201208/149413.html

参数默认值是指在调用函数�Ӟ��若省略了某个实参�Q�函��C��自动��参数分配一个默认��|��使得函数调用的方便性和灉|��性大大提高�?/p>
举个例子�Q�比�?a style="color: rgb(51,51,51); font-size: 14px; text-decoration: none" class="keylink" target="_blank">PHP中的字符串截取函数substr(string,start,length)�Q�当不指定length�Ӟ��函数��默认截取字�W�串中start位置到字�W�串�l�束�Q�而如果指定了length�Q�则截取从start位置开始的以length为长度的字符�Ԍ��所以如果调用的是substr('http://www.hualai.net.cn',11,6)�Q�则�q�回的是hualai�Q�如果省略掉最后一个参敎ͼ�substr('http://www.hualai.net.cn',11)�Q�则�q�回hualai.net.cn�?/p>
再比如jQuery框架中，$(selector).html()�Ҏ��是获取该元素内的HTML代码�Q��?(selector).html(content)则是讄��该元素内的HTML。我们知道，在C语言中，我们可以通过如下形式来�ؓ函数参数讄��默认��|��

[cpp]
void foo(int a, int b = 1, bool c = false);
�?a style="color: rgb(51,51,51); font-size: 14px; text-decoration: none" class="keylink" target="_blank">Java中，则可以通过函数重蝲来设�|�函数参数默认��|��

[java]
public void foo(int a){
    foo(a, 1);
}
public void foo(int a, int b){
    foo(a, b, false);
}
public void foo(int a, int b, bool c){
    //函数内容
}
而在JavaScript中，如何像jQuery那样讄��函数参数默认值呢�Q�JavaScript中�ƈ没有像C语言中定义函数时直接在参数后面赋值的�Ҏ��Q�也没有像Java里那��L��函数重蝲�Q�但我们可以通过JavaScript�Ҏ��中的一个arguments只读变量数组来实玎ͼ�具体如下�Q?/p>
[js]
function foo(){
    var a = arguments[0] ? arguments[0] : 1;
    var b = arguments[1] ? arguments[1] : false;
    //函数内容
}
以上是通过判断参数是否存在�Q�若不存在则��默认值附�l�变量，而我们可以通过判断参数的类型来实现重蝲�Q?/p>
[js]
function foo(){
    if(typeof arguments[0] == 'string')
        alert('参数�c�d��为字�W�串');
    else if(typeof arguments[0] == 'number')
        alert('参数�c�d��为数�?);
}
或者：

[js]
function foo(){
    if(arguments[0].constructor == String)
        alert('参数�c�d��为字�W�串');
    else if(arguments[0].constructor == Number)
        alert('参数�c�d��为数�?);
}

Ke 2014-07-24 09:22 发表评论

SQL Server 2005中的CTE递归查询得到一��|�� (�?

Ke — Thu, 17 Jul 2014 06:46:00 GMT
原文:http://blog.csdn.net/bin_520_yan/article/details/5998349

感觉�q�个CTE递归查询蛮好用的�Q�先举个例子�Q?/p>

[c-sharp] view plain copy print ?

use City;
go
create table Tree
(
  ID int identity(1,1) primary key not null,
  Name varchar(20) not null,
  Parent varchar(20) null
)
go
insert Tree values('大学',null)
insert Tree values('学院','大学')
insert Tree values('计算机学�?,'学院')
insert Tree values('�|�络工程','计算机学�?)
insert Tree values('信息��理','计算机学�?)
insert Tree values('电信学院','学院')
insert Tree values('教务�?,'大学')
insert Tree values('材料�U?,'教务�?)
insert Tree values('招生�?,'大学')
go
with CTE as
(
-->Begin 一个定位点成员
select ID, Name,Parent,cast(Name as nvarchar(max)) as TE,0 as Levle from Tree where Parent is null
-->End
union all
-->Begin一个递归成员
select Tree.ID, Tree.Name,Tree.Parent,cast(replicate(' ',len(CTE.TE))+'|_'+Tree.name as nvarchar(MAX)) as TE,Levle+1 as Levle
        from Tree inner join CTE
        on Tree.Parent=CTE.Name
-->End
)
select * from CTE order by ID
--1.��?nbsp;CTE 表达式拆分�ؓ定位�Ҏ��员和递归成员�?nbsp;
--2.�q�行定位�Ҏ��员，创徏�W�一个调用或基准�l�果�?nbsp;(T0)�?nbsp;
--3.�q�行递归成员�Q�将 Ti 作�ؓ输入(�q�里只有一条记�?�Q�将 Ti+1 作�ؓ输出�?nbsp;
--4.重复步骤 3�Q�直到返回空集�?nbsp;
--5.�q�回�l�果集。这是对 T0 �?nbsp;Tn 执行 UNION ALL 的结果�?nbsp;

上面的SQL语句再次插入一条数据：

insert Tree values('�|�络1�?,'�|�络工程')

     �q�行�l�果如下图：

�? �q�行�l�果

    注意点：貌似在递归成员处所选择的字�D�都必须Tree表的数据�Q�而不能是CTE�l�果集中的除了Tree中没有而CTE中有的字�D�在�q�里才可以引用，比如字段TE�?/p>
    首先看下�Q�遍历的�W?条记录的SQL语句�Q?/p>

[c-sharp] view plain copy print ?

select ID, Name,Parent,cast(Name as nvarchar(max)) as TE,0 as Levle from Tree where Parent is null

   获取的结果�ؓ�Q?/p>
   Name Parent   TE    Levle

-------------------------------------

     大学    NULL   大学     0

   递归�W?�ơ所获取的结果集合的�c�SQL语句为：

[c-sharp] view plain copy print ?

select Tree.ID, Tree.Name,Tree.Parent,cast(replicate(' ',len(CTE.TE))+'|_'+Tree.name as nvarchar(MAX)) as TE,Levle+1 as Levle
from Tree inner join
   (select ID, Name,Parent,cast(Name as nvarchar(max)) as TE,0 as Levle from Tree where Parent is null)
as CTE
on Tree.Parent=CTE.Name

   上面的CTE子查询的�l�果��是�W�一�ơ递归查询的结果集�Q�上面SQL�q�行�l�果为：

   同样的，��第二次递归查询的上面三条记录作为第三次查询�?#8216;定位成员’�Q?/p>
【这里要注意�Q�上面的三条记录是从最后一条开始依�ơ作为第三次递归的输入的�Q�即�W�一条是ID=9的记录，接下来是7�?�Q�关于第四次递归也类伹{�?/p>
   �W�三�ơ递归�c�SQL语句

[c-sharp] view plain copy print ?

select Tree.ID, Tree.Name,Tree.Parent,cast(replicate(' ',len(CTE.TE))+'|_'+Tree.name as nvarchar(MAX)) as TE,Levle+1 as Levle
from Tree inner join
(�W�二�ơ递归查询的SQL语句)as CTE
on Tree.Parent=CTE.Name

   �l�果如下�Q?/p>

其实每次递归的类SQL可�ؓ如下所�C�：

[c-sharp] view plain copy print ?

select Tree.ID, Tree.Name,Tree.Parent,cast(replicate(' ',len(CTE.TE))+'|_'+Tree.name as nvarchar(MAX)) as TE,Levle+1 as Levle
from Tree inner join
(上次递归查询的结果集�Q�仅仅是上次那一�ơ的�Q�而不是以前的��d��l�果�?
as CTE
on Tree.Parent=CTE.Name

�W�四�ơ递归一�ơ类推，最后所查询的结果�ؓ上面所有递归的union�?/p>
�l�：在上面的SQ语句查询�l�果中，ID�?0的记录应该要攑֜�ID�?的后面�?/p>
往数据表中再次��d��两条记录�Q?/p>
insert Tree values('计科','计算机学�?)
insert Tree values('�?,'�|�络1�?)

再次修改上面的SQL语句�Q?/p>

[c-sharp] view plain copy print ?

with CTE as
(
-->Begin 一个定位点成员
select ID, Name,Parent,cast(Name as nvarchar(max)) as TE,
        ROW_NUMBER()over(order by getdate()) as OrderID
        --最关键是上面这个字�D�，要获取排序字�D�，按字�W�串来排序�?nbsp;
        --其中�H�口函数必须要��用order by�Q�但是不能用整型�Q�那��q��旉��?nbsp;
        from Tree where Parent is null
-->End
union all
-->Begin一个递归成员
select Tree.ID, Tree.Name,Tree.Parent,cast(replicate(' ',len(CTE.TE))+'|_'+Tree.name as nvarchar(MAX)) as TE,
        CTE.OrderID*100+ROW_NUMBER()over(Order by GETDATE()) as OrderID
        from Tree inner join CTE
        on Tree.Parent=CTE.Name
-->End
)
select * from CTE
order by LTRIM(OrderID)--最后将�q�个整型数据转换为字�W�串型的�q�行排序

--有时候整型可以比大小�Q�字�W�串也可以，字符串比的大��是一位一位进行字�W�比较的
--整型+字符�?=整型�Q�只有字�W�串+字符�?=两个字符串的�q�和
--递归查询中：�W�二条记录可以引用第一条记录的�?nbsp;
--动态加载记录时�Q�同一个等�U�的记录识别�W�：RowNumber()over(order by getdate())
--延��Q�可以动态获取某个部门下的所以子部门。也可以获取该部门上�U�的所以部�?nbsp;

--�ȝ��Q�首先要拼凑��Z��个整型数据，然后转换为字�W�串�Q�最后是�q�行字符串的order�Q�而不是整型数据的order�Q?nbsp;

最后的�l�果为：

�? �q�行�l�果

�q�样�Q�无论用��h��入多��条记录都可以进行按部门�Q�按规律�q�行查询�?/p>

Ke 2014-07-17 14:46 发表评论

DataTable更新数据操作(�?

Ke — Mon, 30 Jun 2014 07:49:00 GMT

BLL�?nbsp;

public void Update(DataTable dt)
        {
            foreach (DataRow dr in dt.Rows)
            {
                if (dr.RowState == DataRowState.Deleted)
                    continue;
                if (dr.RowState == DataRowState.Modified || dr.RowState == DataRowState.Added)
                {
                    if (dr["usr_id"] == DBNull.Value)
                    {
                        throw new Exception("用户代码不能为空");
                    }                }
            }

            dal.Update(dt);
        }



DAL�?/p>
public void Update(DataTable dt)
        {
            SqlDataAdapter adapter = new SqlDataAdapter();
            SqlConnection conn = new SqlConnection(SqlHelper.ConnectionString);
            conn.Open();

            adapter.InsertCommand = new SqlCommand("INSERT INTO dbo.t6( com_id ,usr_id ) VALUES( @com_id ,@usr_id)", conn);
            adapter.InsertCommand.CommandType = CommandType.Text;
            adapter.InsertCommand.Parameters.Add("@com_id", SqlDbType.VarChar, 4, "com_id");
            adapter.InsertCommand.Parameters.Add("@usr_id", SqlDbType.VarChar, 8, "usr_id");

            adapter.UpdateCommand = new SqlCommand("update t6 setwhereand usr_id", conn);
            adapter.UpdateCommand.CommandType = CommandType.Text;
            adapter.UpdateCommand.Parameters.Add("@com_id", SqlDbType.VarChar, 4, "com_id");
            adapter.UpdateCommand.Parameters.Add("@usr_id", SqlDbType.VarChar, 8, "usr_id");
            adapter.UpdateCommand.Parameters.Add("@usr_id1", SqlDbType.VarChar, 8, "usr_id");
            adapter.UpdateCommand.Parameters["@usr_id1"].SourceVersion = DataRowVersion.Original;

            adapter.DeleteCommand = new SqlCommand("delete from t6 whereand usr_id", conn);
            adapter.DeleteCommand.CommandType = CommandType.Text;
            adapter.DeleteCommand.Parameters.Add("@com_id", SqlDbType.VarChar, 4, "com_id");
            adapter.DeleteCommand.Parameters.Add("@usr_id", SqlDbType.VarChar, 8, "usr_id");

            adapter.DeleteCommand.Parameters["@com_id"].SourceVersion = DataRowVersion.Original;
            adapter.DeleteCommand.Parameters["@usr_id"].SourceVersion = DataRowVersion.Original;

            adapter.Update(dt);
        }

前台

    public partial class DataTableUpdate : Form
    {

        public BLL.Users Bu = new BLL.Users();
        public DataTable dtUsr = new DataTable();
        public MOD.Users modObject = new MOD.Users();

        public string _UserId = "";

        public DataTableUpdate()
        {
            InitializeComponent();
            dataGridView1.AutoGenerateColumns = false;
        }

//�H�口加蝲

        private void Form1_Load(object sender, EventArgs e)
        {
            dtUsr = Bu.GetList();
            dataGridView1.DataSource = dtUsr;
            BindValue();
        }

        private void BindValue()
        {
            tb_com_id.DataBindings.Add("Text", dataGridView1.DataSource, "com_id");
            tb_UsrId.DataBindings.Add("Text", dataGridView1.DataSource, "usr_id");

            //手动修改可以; 代码赋值需要用下面�q�句�?br />            tb_UsrId.DataBindings[0].DataSourceUpdateMode = DataSourceUpdateMode.OnPropertyChanged;
        }

        private void 保存_Click(object sender, EventArgs e)
        {
            foreach (DataRow dr in dtUsr.Rows)
            {
                dr.EndEdit();
            }
            try
            {
                Bu.Update(dtUsr);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                return;
            }
            MessageBox.Show("保存成功�Q?, "�pȝ��提示");
        }

        private void 删除_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("您确认要删除用户�Q? + tb_UsrName.Text.Trim()+" ?", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2) == DialogResult.No)
                return;

            if (dataGridView1.CurrentCell == null)
                return;

            try
            {
                dataGridView1.Rows.Remove(dataGridView1.CurrentRow);
                Bu.Update(dtUsr);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                return;
            }
            MessageBox.Show("删除成功�Q?, "�pȝ��提示");

        }

        private void 增加_Click(object sender, EventArgs e)
        {
            DataRow dr = dtUsr.NewRow();
            dr["usr_id"] = _UserId;
            dtUsr.Rows.Add(dr);
            dataGridView1.CurrentCell = dataGridView1.Rows[dataGridView1.Rows.Count - 1].Cells[0];
        }

        private void 取消_Click(object sender, EventArgs e)
        {
            dtUsr.RejectChanges();
        }
牛铁�Q?a style="color: rgb(63,167,203); text-decoration: underline" >http://blog.csdn.net/fangxinggood/archive/2008/04/18/2304047.aspx

Ke 2014-06-30 15:49 发表评论

在数据表(DataTable)中操作数�?�?

Ke — Mon, 30 Jun 2014 03:08:00 GMT

转自�Q?a >http://blog.csdn.net/cui55/article/details/1371411

�?span class="Apple-converted-space"> DataSet 中创�?span class="Apple-converted-space"> DataTable 之后�Q�您执行的活动可以与使用数据库中的表时执行的�z�d��相同。您可以��d��、查看、编辑和删除表中的数据；可以监视错误和事�Ӟ��q�且可以查询表中的数据。在修改 DataTable 中的数据�Ӟ��您也可以验证更改是否正确�Q��ƈ军_��是否以编�E�方式接受更�Ҏ��拒绝更改�?/p>
本节内容

��数据添臌��?/font>:说明如何创徏新行�q�将其添臌��中�?/p>

在创�?span class="Apple-converted-space"> DataTable �q��用列和约束定义其�l�构之后�Q�您可以��新的数据行添至表中。要��d��新行�Q�可��一个新变量声明�?span class="Apple-converted-space"> DataRow �c�d��。调�?span class="Apple-converted-space"> NewRow �Ҏ��Ӟ��返回新�?span class="Apple-converted-space"> DataRow 对象。然后，DataTable 会根据表的结构按 DataColumnCollection 的定义创�?span class="Apple-converted-space"> DataRow 对象�?
以下�C�Z��演示了如何通过调用 NewRow �Ҏ��来创建新行�?/p>
DataRow workRow = workTable.NewRow();

然后您可以��用烦引或列名来操作新��d��的行�Q�如下例所�C��?/p>
workRow["CustLName"] = "Smith";
workRow[1] = "Smith";

在将数据插入新行后，Add �Ҏ��可用于将行添�?span class="Apple-converted-space"> DataRowCollection�Q�如以下代码所�C��?/p>
workTable.Rows.Add(workRow);

您也可以通过传入值的数组�Q�类型化�?span class="Apple-converted-space"> Object�Q�，调用 Add �Ҏ��来添加新行，如下例所�C��?/p>
workTable.Rows.Add(new Object[] {1, "Smith"});

��类型化�?span class="Apple-converted-space"> Object 的值的数组传递到 Add �Ҏ��Q�可在表内创建新行�ƈ��其列��D��|��ؓ对象数组中的倹{��请注意�Q�数�l�中的��g��Ҏ��它们在表中出现的��序相��与各列匹配�?/p>
以下�C�Z��十行添��x��建的 Customers 表中�?/p>
DataRow workRow;

for (int i = 0; i <= 9; i++)
{
workRow = workTable.NewRow();
workRow[0] = i;
workRow[1] = "CustName" + i.ToString();
workTable.Rows.Add(workRow);
}

查看表中数据:说明如何讉K��行中的数据，包括数据的原始版本和当前版本�?/p>

可以使用 DataTable �?span class="Apple-converted-space"> Rows �?span class="Apple-converted-space"> Columns 集合来访�?span class="Apple-converted-space"> DataTable 中的内容。也可以�Ҏ��包括搜烦标准、排序顺序和行状态等特定标准�Q��?span class="Apple-converted-space"> DataTable.Select �Ҏ��q�回 DataTable 中数据的子集。此外，用主键值搜索特定行�Ӟ��q�可使用 DataRowCollection �?span class="Apple-converted-space"> Find �Ҏ��?
DataTable 对象�?span class="Apple-converted-space"> Select �Ҏ��q�回一�l�与指定条�g匚w��?span class="Apple-converted-space"> DataRow 对象�?strong>Select 采用�{�选表辑ּ�、排序表辑ּ��?span class="Apple-converted-space"> DataViewRowState 的可选参数。筛选表辑ּ��Ҏ�� DataColumn ��|��例如 LastName = 'Smith'。排序表辑ּ�遵��@用于为列排序的标�?SQL �U�定�Q�例�?span class="Apple-converted-space"> LastName ASC, FirstName ASC。有关编写表辑ּ�的规则，请参�?strong>DataColumn �cȝ�� Expression 属性�?/p>
提示如果您将�?span class="Apple-converted-space"> DataTable �?span class="Apple-converted-space"> Select �Ҏ��执行多次调用�Q�可通过先�ؓ DataTable 创徏 DataView来提高性能。创�?span class="Apple-converted-space"> DataView 会�ؓ表中的行�~�制索引。然后，Select �Ҏ��会��用该索引�Q�这样将显著�~�短生成查询�l�果的时间。有关�ؓ DataTable 创徏 DataView 的信息，请参�?a style="color: rgb(51,102,153); text-decoration: none" >创徏和��?DataView�?/blockquote>
Select �Ҏ��Z�� DataViewRowState ��定要查看或操作的行的版本。下表说明了可能�?span class="Apple-converted-space"> DataViewRowState 枚�D倹{�?/p>

成员名称说明

CurrentRows 当前行，包括未更改的行、已��d��的行和已修改的行�?/td>

Deleted 已删除的行�?/td>

ModifiedCurrent 当前版本�Q�它是原始数据的修改版本�Q�请参阅ModifiedOriginal�Q��?/td>

ModifiedOriginal 所有已修改行的原始版本。��?span class="Apple-converted-space"> ModifiedCurrent �Ӟ��当前版本可用�?/td>

Added 新行�?/td>

None 无�?/td>

OriginalRows 原始行，包括未更改的行和已删除的行�?/td>

Unchanged 未更改的行�?/td>

在下面的�C�Z��中，DataSet 对象已经�q�筛选，�q�样�Q�您可以只��用其 DataViewRowState 讄��?span class="Apple-converted-space"> CurrentRows的行�?/p>
DataRow[] currRows = workTable.Select(null, null, DataViewRowState.CurrentRows);

if (currRows.Length < 1 )
Console.WriteLine("No Current Rows Found");
else
{
foreach (DataColumn myCol in workTable.Columns)
    Console.Write("/t{0}", myCol.ColumnName);

Console.WriteLine("/tRowState");

foreach (DataRow myRow in currRows)
{
    foreach (DataColumn myCol in workTable.Columns)
      Console.Write("/t{0}", myRow[myCol]);

    Console.WriteLine("/t" + myRow.RowState);
}
}

Select �Ҏ��可用于返回具有不�?span class="Apple-converted-space"> RowState 值或字段值的行。以下示例返回一个引用所有已删除行的 DataRow数组�Q��ƈ�q�回另一个引用所有已排序行（按照 CustLName 排序�Q�其�?span class="Apple-converted-space"> CustID 列大�?5�Q�的 DataRow 数组�?/p>
// Retrieve all deleted rows.
DataRow[] delRows = workTable.Select(null, null, DataViewRowState.Deleted);

// Retrieve rows where CustID > 5, and order by CustLName.
DataRow[] custRows = workTable.Select("CustID > 5", "CustLName ASC");

�~�辑表中的数�?/font>:说明如何修改行中的数据，包括挂�v对行的更改，直至验证�q�接受了��的更攏V�?/p>

当您�?span class="Apple-converted-space"> DataRow 中更改列值时�Q�所做更改会立即�|�于行的 Current 状态中。然后，RowState 会设�|��ؓModified�Q��ƈ使用 DataRow �?span class="Apple-converted-space"> AcceptChanges �?span class="Apple-converted-space"> RejectChanges �Ҏ��来接受或拒绝所做更攏V�?strong>DataRow�q�提供了三种可用于在�~�辑行时��行的状态挂��L��Ҏ��。这些方法是 BeginEdit�?strong>EndEdit �?span class="Apple-converted-space"> CancelEdit�?
当您直接�?span class="Apple-converted-space"> DataRow 中修改列值时�Q?strong>DataRow 会��?span class="Apple-converted-space"> Current�?strong>Default �?span class="Apple-converted-space"> Original 行版本来��理列倹{��除�q�些行版本以外，BeginEdit�?strong>EndEdit �?span class="Apple-converted-space"> CancelEdit �Ҏ��q��用第四个行版本：Proposed�?/p>
在执行编辑操作（通过调用 BeginEdit 开始，�q�且通过使用 EndEdit �?span class="Apple-converted-space"> CancelEdit 或者通过调用AcceptChanges �?span class="Apple-converted-space"> RejectChanges �l�束�Q�的�q�程中，Proposed 行版本会存在�?/p>
在编辑操作过�E�中�Q�您可以通过计算 DataTable �?span class="Apple-converted-space"> ColumnChanged 事�g中的 ProposedValue 来将验证逻辑应用于各列�?strong>ColumnChanged 事�g保存 DataColumnChangeEventArgs�Q�可保持�Ҏ��在更改的列和ProposedValue 的引用。计��了��值后�Q�可以对其进行修�Ҏ��取消�~�辑。编辑结束时�Q�行�?span class="Apple-converted-space"> Proposed 状态中�U�d��?/p>
您可以通过调用 EndEdit 来确认编辑，也可以通过调用 CancelEdit 来取消编辑。请注意�Q�尽��?span class="Apple-converted-space"> EndEdit ��实已确认您所做的�~�辑�Q�但在调�?span class="Apple-converted-space"> AcceptChanges 之前�Q?strong>DataSet �q�没有实际接受更攏V��另外请注意�Q�如果在EndEdit �?span class="Apple-converted-space"> CancelEdit �~�辑�l�束之前调用 AcceptChanges�Q�编辑将会终止，�q�接�?span class="Apple-converted-space"> Current �?span class="Apple-converted-space"> Original 行版本的 Proposed 行倹{��调�?span class="Apple-converted-space"> RejectChanges 会以同样的方式结束编辑，�q�放�?span class="Apple-converted-space"> Current �?span class="Apple-converted-space"> Proposed 行版本。在调用 AcceptChanges �?span class="Apple-converted-space"> RejectChanges 之后调用 EndEdit �?span class="Apple-converted-space"> CancelEdit 不会起作用，因�ؓ�~�辑已经�l�束�?/p>
以下�C�Z��演示了如何将 BeginEdit �?span class="Apple-converted-space"> EndEdit �?span class="Apple-converted-space"> CancelEdit 一起��用。本�C�Z��也会��?span class="Apple-converted-space"> ColumnChanged 事�g中的 ProposedValue�Q��ƈ军_��是否取消�~�辑�?/p>
DataTable workTable = new DataTable();
workTable.Columns.Add("LastName", typeof(String));

workTable.ColumnChanged += new DataColumnChangeEventHandler(OnColumnChanged);

DataRow workRow = workTable.NewRow();
workRow[0] = "Smith";
workTable.Rows.Add(workRow);

workRow.BeginEdit();
// Causes the ColumnChanged event to write a message and cancel the edit.
workRow[0] = "";
workRow.EndEdit();

// Displays "Smith, New".
Console.WriteLine("{0}, {1}", workRow[0], workRow.RowState);

protected static void OnColumnChanged(Object sender, DataColumnChangeEventArgs args)
{
if (args.Column.ColumnName == "LastName")
    if (args.ProposedValue.ToString() == "")
    {
      Console.WriteLine("Last Name cannot be blank. Edit canceled.");
      args.Row.CancelEdit();
    }
}

行状态与行版�?/font>:提供有关行的不同状态的信息�?/p>

ADO.NET 用行状态和版本��理表中的行。行状态表�C��的状态。当修改行时�Q�行版本会维护存储于行中的��|��包括当前倹{��原始值和默认倹{��例如，修改了某行中的一列后�Q�该行会有一�?span class="Apple-converted-space"> Modified 的行状态，�q�且会存在两个行版本�Q?strong>Current�Q�包含当前行��|��?span class="Apple-converted-space"> Original�Q�包含修改该列前的行��|��?
每个 DataRow 对象都具�?span class="Apple-converted-space"> RowState 属性，您可以检查此属性来��定行的当前状态。下表给��Z��对各RowState 枚�D值的��要说明�?/p>

RowState 说明

Unchanged 自上�ơ调�?span class="Apple-converted-space"> AcceptChanges 之后�Q�或�?span class="Apple-converted-space"> DataAdapter.Fill 创徏了行之后�Q�未做出�q��Q何更攏V�?/td>

Added 已将行添臌��中，但尚未调�?span class="Apple-converted-space"> AcceptChanges�?/td>

Modified 已更改了行的一些元素�?/td>

Deleted 已将该行从表中删除，�q�且��未调用 AcceptChanges�?/td>

Detached 对于已经创徏但不属于��M�� DataRowCollection 的行�Q�设�|��ؓ Detached。新��?span class="Apple-converted-space"> RowState讄��?span class="Apple-converted-space"> Detached。通过调用 Add �Ҏ��新�?span class="Apple-converted-space"> DataRow 添至 DataRowCollection 之后�Q?strong>RowState 属性的��D��|��ؓ Added�?
对于已经使用 Remove �Ҏ��Q�或是在使用 Delete �Ҏ��之后使用�?span class="Apple-converted-space"> AcceptChanges �Ҏ��Q�从DataRowCollection 中移除的行，也设�|��ؓ Detached�?/p>

�?span class="Apple-converted-space"> DataSet�?strong>DataTable �?span class="Apple-converted-space"> DataRow 上调�?span class="Apple-converted-space"> AcceptChanges �Ӟ��会移除行状态�ؓ Deleted 的所有行。剩余的行会被赋�?span class="Apple-converted-space"> Unchanged 行状态，�q�且 Original 行版本中的��g��改写�?span class="Apple-converted-space"> Current 行版本倹{��调�?strong>RejectChanges �Ӟ��会移除行状态�ؓ Added 的所有行。剩余的行会被赋�?span class="Apple-converted-space"> Unchanged 的行状态，�q�且Current 行版本中的��g��改写�?span class="Apple-converted-space"> Original 行版本倹{�?/p>
通过用列引用来传�?span class="Apple-converted-space"> DataRowVersion 参数�Q�您可以查看行的不同行版本，如下例所�C��?/p>
DataRow custRow = custTable.Rows[0];
string custID = custRow["CustomerID", DataRowVersion.Original].ToString();

下表�l�出了各 DataRowVersion 枚�D值的��要说明�?/p>

DataRowVersion 说明

Current 行的当前倹{��如果是�?span class="Apple-converted-space"> Deleted �?span class="Apple-converted-space"> RowState 的行�Q�则不存在此行版本�?/td>

Default 特定行的默认行版本�?strong>Added�?strong>Modified �?span class="Apple-converted-space"> Unchanged 行的默认行版本是Current�?strong>Deleted 行的默认行版本是 Original�?strong>Detached 行的默认行版本是 Proposed�?/td>

Original 行的原始倹{��如果是�?span class="Apple-converted-space"> Added �?span class="Apple-converted-space"> RowState 的行�Q�则不存在此行版本�?/td>

Proposed 行的��倹{��在对行�q�行�~�辑操作期间�Q�或对于不属�?span class="Apple-converted-space"> DataRowCollection 的行�Q�存在此行版本�?/td>

通过调用 HasVersion �Ҏ��q�将 DataRowVersion 作�ؓ参数传递，您可以测�?span class="Apple-converted-space"> DataRow 是否��h��特定的行版本。例如，在调�?span class="Apple-converted-space"> AcceptChanges 之前�Q?code class="ce">DataRow.HasVersion(DataRowVersion.Original) �Ҏ��d��的行��返�?span class="Apple-converted-space"> false�?/p>
例如�Q�以下代码示例显�C�Z��表中所有已删除行的倹{��已删除的行没有 Current 行版本，因此在访问列值时必须传�?span class="Apple-converted-space"> DataRowVersion.Original�?/p>
DataTable catTable = catDS.Tables["Categories"];

DataRow[] delRows = catTable.Select(null, null, DataViewRowState.Deleted);

Console.WriteLine("Deleted rows:/n");

foreach (DataColumn catCol in catTable.Columns)
Console.Write(catCol.ColumnName + "/t");
Console.WriteLine();

foreach (DataRow delRow in delRows)
{
foreach (DataColumn catCol in catTable.Columns)
    Console.Write(delRow[catCol, DataRowVersion.Original] + "/t");
Console.WriteLine();
}

从表中删除行:说明如何从表中移除行�?/p>

用于�?span class="Apple-converted-space"> DataTable 对象中删�?span class="Apple-converted-space"> DataRow 对象的方法有两种�Q?strong>DataRowCollection 对象�?span class="Apple-converted-space"> Remove �Ҏ��?strong>DataRow 对象�?span class="Apple-converted-space"> Delete �Ҏ��?strong>Remove �Ҏ��?span class="Apple-converted-space"> DataRowCollection 中删�?span class="Apple-converted-space"> DataRow�Q��?span class="Apple-converted-space"> Delete �Ҏ��只将行标��Cؓ删除。当应用�E�序调用 AcceptChanges �Ҏ��Ӟ��才会发生实际的删除。通过使用 Delete�Q�您可以在实际删除之前先以编�E�方式检查哪些行标记为删除。如果将行标��Cؓ删除�Q�其 RowState 属性会讄��?span class="Apple-converted-space"> Deleted�?
在将 DataSet �?span class="Apple-converted-space"> DataTable �?span class="Apple-converted-space"> DataAdapter 和关�p�d��数据源一起��用时�Q�用 DataRow �?span class="Apple-converted-space"> Delete �Ҏ��U�除行�?strong>Delete �Ҏ��只是�?span class="Apple-converted-space"> DataSet �?span class="Apple-converted-space"> DataTable 中将行标��Cؓ Deleted�Q�而不会移除它。�?span class="Apple-converted-space"> DataAdapter 在遇到标��Cؓ Deleted 的行�Ӟ��会执行其 DeleteCommand 以在数据源中删除该行。然后，��可以用AcceptChanges �Ҏ��怹��U�除该行。如果��?span class="Apple-converted-space"> Remove 删除该行�Q�则该行��从表中完全�U�除�Q�但DataAdapter 不会在数据源中删除该行�?/p>
DataRowCollection �?span class="Apple-converted-space"> Remove �Ҏ��采用 DataRow 作�ؓ参数�Q��ƈ��其从集合中�U�除�Q�如下例所�C��?/p>
workTable.Rows.Remove(workRow);

作�ؓ�Ҏ��Q�以下示例演�C�Z��如何调用 DataRow 上的 Delete �Ҏ��来将�?span class="Apple-converted-space"> RowState 改�ؓ Deleted�?/p>
workRow.Delete();

如果��行标记为删除，�q�且调用 DataTable 对象�?span class="Apple-converted-space"> AcceptChanges �Ҏ��Q�该行就会从 DataTable 中移除。相比之下，如果调用 RejectChanges�Q�行�?span class="Apple-converted-space"> RowState ��׃��恢复到被标记�?span class="Apple-converted-space"> Deleted 之前的状态�?/p>
注意如果 DataRow �?span class="Apple-converted-space"> RowState �?span class="Apple-converted-space"> Added�Q�则意味着已将其添臌��中，然后��其标记�?strong>Deleted�Q�从表中�U�除�?/blockquote>

��d��和读取行错误信息:说明如何按行插入错误信息�Q�以用于解决有关应用�E�序内行中数据的问题�?/p>

��Z��避免在编�?span class="Apple-converted-space"> DataTable 中的值时每次发生行错误都必须响应�Q�可��错误信息添臌��中，以便以后使用�?strong>DataRow 对象通过对各行提�?span class="Apple-converted-space"> RowError 属性来支持此功能。将数据添至 DataRow �?span class="Apple-converted-space"> RowError 属性会��?strong>DataRow �?span class="Apple-converted-space"> HasErrors 属性标��Cؓ true。如�?span class="Apple-converted-space"> DataRow �?span class="Apple-converted-space"> DataTable 的组成部分，�?span class="Apple-converted-space"> DataRow.HasErrors�?span class="Apple-converted-space"> true�Q�则 DataTable.HasErrors 属性也�?span class="Apple-converted-space"> true。这也适用�?span class="Apple-converted-space"> DataTable 所属的 DataSet。�ؓ错误做测试时�Q�可以检�?span class="Apple-converted-space"> HasErrors 属性以��定错误信息是否已添��x��有行。如�?span class="Apple-converted-space"> HasErrors �?span class="Apple-converted-space"> true�Q�则可��?span class="Apple-converted-space"> DataTable �?strong>GetErrors �Ҏ��以便只返回和��查有错误的行�Q�如下例所�C��?
DataTable workTable = new DataTable("Customers");
workTable.Columns.Add("CustID", typeof(Int32));
workTable.Columns.Add("Total", typeof(Double));

workTable.RowChanged += new DataRowChangeEventHandler(OnRowChanged);

for (int i = 0; i < 10; i++)
workTable.Rows.Add(new Object[] {i, i*100});

if (workTable.HasErrors)
{
Console.WriteLine("Errors In Table " + workTable.TableName);

foreach (DataRow myRow in workTable.GetErrors())
{
    Console.WriteLine("CustID = " + myRow["CustID"]);
    Console.WriteLine(" Error = " + myRow.RowError + "/n");
}
}

protected static void OnRowChanged(Object sender, DataRowChangeEventArgs args)
{
// Check for zero values.
if (args.Row["Total"].Equals(0D))
    args.Row.RowError = "Total cannot be 0.";
}

接受或拒�l�对行的更改:说明如何接受或拒�l�对行的更改�?/p>

在检验过�?span class="Apple-converted-space"> DataTable 中的数据所做更改的准确性之后，可��?span class="Apple-converted-space"> DataRow�?strong>DataTable �?span class="Apple-converted-space"> DataSet �?strong>AcceptChanges �Ҏ��来接受更改，此方法会��?span class="Apple-converted-space"> Current 行��D��|��ؓ Original ��|��q�会��?span class="Apple-converted-space"> RowState 属性设�|��ؓ Unchanged。接受或拒绝更改会清除所�?span class="Apple-converted-space"> RowError 信息�Q��ƈ��?span class="Apple-converted-space"> HasErrors 属性设�|��ؓ false。接受或拒绝更改�q�可以媄响在数据源中更新数据。有��x��多信息，请参�?a style="color: rgb(51,102,153); text-decoration: none" >使用 DataAdapter �?DataSet 更新数据�?/a>�?
如果 DataTable 上存在外键约束，使用 AcceptChanges �?span class="Apple-converted-space"> RejectChanges 接受或拒�l�的更改��׃��Ҏ��ForeignKeyConstraint.AcceptRejectRule 传播�?span class="Apple-converted-space"> DataRow 的子行�?/p>
以下�C�Z��查有错误的行�Q�在适用之处解决错误�Q�拒�l�无法解决错误的行。请注意�Q�对于解决的错误�Q?strong>RowError��g��重置为空字符�Ԍ��D��?span class="Apple-converted-space"> HasErrors 属性设�|��ؓ false。当解决或拒�l�了所有的有错误的行时�Q�就会调�?strong>AcceptChanges 来接受对整个 DataTable 的所有更攏V�?/p>
if (workTable.HasErrors)
{

foreach (DataRow errRow in workTable.GetErrors())
{
    if (errRow.RowError == "Total cannot exceed 1000.")
    {
      errRow["Total"] = 1000;
      errRow.RowError = "";    // Clear the error.
    }
    else
      errRow.RejectChanges();
}
}

workTable.AcceptChanges();

处理 DataTable 事�g:提供可用�?span class="Apple-converted-space"> DataTable 的事件的相关信息�Q�包括修改列值和��d��或删除行时的事�g�?/p>

DataTable 对象提供一�p�d��可由应用�E�序处理的事件。下表说明了 DataTable 事�g�?

事�g 说明

ColumnChanged 在值已成功插入列时发生�?/td>

ColumnChanging 在已提交列值时发生�?/td>

RowChanged 在已成功�~�辑表中的行后发生�?/td>

RowChanging 当正在更改表中的行时发生�?/td>

RowDeleted 在表中的某行已被标记�?span class="Apple-converted-space"> Deleted 之后发生�?/td>

RowDeleting 在表中的某行被标��Cؓ Deleted 之前发生�?/td>

以下�C�Z��创徏 4 个事�Ӟ��OnColumnChanged�?strong>OnColumnChanging�?strong>OnRowChanged �?strong>OnRowChanging。这些事件中的每一个都在列或行更改时发生�?/p>
workTable.ColumnChanged += new DataColumnChangeEventHandler(OnColumnChanged);
workTable.ColumnChanging += new DataColumnChangeEventHandler(OnColumnChanging);
workTable.RowChanged     += new DataRowChangeEventHandler(OnRowChanged);
workTable.RowChanging    += new DataRowChangeEventHandler(OnRowChanging);

protected static void OnColumnChanged(object sender, DataColumnChangeEventArgs args)
{
Console.Write(" ColumnChanged: ");
Console.Write(args.Column.ColumnName + " changed to '" + args.ProposedValue + "'/n");
}

protected static void OnColumnChanging(object sender, DataColumnChangeEventArgs args)
{
Console.Write("ColumnChanging: ");
Console.Write(args.Column.ColumnName + " equals '" + args.Row[args.Column] +
                    "', changing to '" + args.ProposedValue + "'/n");
}

protected static void OnRowChanging(object sender, DataRowChangeEventArgs args)
{
if (args.Action != DataRowAction.Nothing)
    Console.WriteLine("   RowChanging: Action = " + args.Action + ", CustID = " + args.Row["CustID"]);
}

protected static void OnRowChanged(object sender, DataRowChangeEventArgs args)
{
if (args.Action != DataRowAction.Nothing)
    Console.WriteLine("    RowChanged: Action = " + args.Action + ", CustID = " + args.Row["CustID"]);
}

Ke 2014-06-30 11:08 发表评论

Ke — Fri, 08 Nov 2013 08:57:00 GMT

/****** Object: Function [dbo].[F_SQLSERVER_SPLIT] Script Date: 2013-10-30 16:21:46 ******/
USE [ZBP];
GO
SET ANSI_NULLS OFF;
GO
SET QUOTED_IDENTIFIER ON;
GO
CREATE FUNCTION [dbo].[F_SQLSERVER_SPLIT](@Long_str varchar(8000),@split_str varchar(100))
RETURNS @tmp TABLE(
ID inT IDENTITY PRIMARY KEY,
short_str varchar(8000)
)
AS
BEGIN
DECLARE @long_str_Tmp varchar(8000),@short_str varchar(8000),@split_str_length int
SET @split_str_length = LEN(@split_str)
IF CHARINDEX(@split_str,@Long_str)=1
SET @long_str_Tmp=SUBSTRING(@Long_str,@split_str_length+1,LEN(@Long_str)-@split_str_length)
ELSE
SET @long_str_Tmp=@Long_str
IF CHARINDEX(REVERSE(@split_str),REVERSE(@long_str_Tmp))>1
SET @long_str_Tmp=@long_str_Tmp+@split_str
ELSE
SET @long_str_Tmp=@long_str_Tmp
IF CHARINDEX(@split_str,@long_str_Tmp)=0
Insert INTO @tmp select @long_str_Tmp
ELSE
BEGIN
WHILE CHARINDEX(@split_str,@long_str_Tmp)>0
BEGIN
SET @short_str=SUBSTRING(@long_str_Tmp,1,CHARINDEX(@split_str,@long_str_Tmp)-1)
DECLARE @long_str_Tmp_LEN INT,@split_str_Position_END int
SET @long_str_Tmp_LEN = LEN(@long_str_Tmp)
SET @split_str_Position_END = LEN(@short_str)+@split_str_length
SET @long_str_Tmp=REVERSE(SUBSTRING(REVERSE(@long_str_Tmp),1,@long_str_Tmp_LEN-@split_str_Position_END))
IF @short_str<>'' Insert INTO @tmp select @short_str
END
END
RETURN
END
GO

Ke 2013-11-08 16:57 发表评论

SQL Server 2000 十六�q�制与十�q�制互�{�Q�收藏）

Ke — Fri, 08 Nov 2013 08:54:00 GMT

十进制�{十六�q�制
/****** Object: Function [dbo].[IntToHex] Script Date: 2013-10-30 16:22:15 ******/
USE [ZBP];
GO
SET ANSI_NULLS OFF;
GO
SET QUOTED_IDENTIFIER ON;
GO
CREATE FUNCTION [dbo].[IntToHex]
(@IntNum bigint)
RETURNS varchar(16)
AS
BEGIN
declare @Mods bigint, @res varchar(16)
set @res=''
while @IntNum <> 0
begin
set @Mods = @IntNum % 16
if @Mods > 9
set @res = Char(Ascii('A')+@Mods-10)+@res
else
set @res = Cast(@Mods as varchar(4))+@res
set @IntNum = @IntNum/16
end
return @res
END
GO
十六�q�制转十�q�制
/****** Object: Function [dbo].[HexToInt] Script Date: 2013-10-30 16:22:04 ******/
USE [ZBP];
GO
SET ANSI_NULLS OFF;
GO
SET QUOTED_IDENTIFIER ON;
GO
CREATE FUNCTION [dbo].[HexToInt]
(@hex varchar(100))
RETURNS int
AS
BEGIN
Declare @result bigint,@iPos int,@iTmp bigint,@iLoop int,@tmp varchar(16)
Set @tmp = '0123456789ABCDEF'
Select @result = 0,@iPos = 0
While @iPos < Len(@hex)
Begin
Set @iTmp =
CharIndex(substring(@hex,Len(@hex) - @iPos,1),@tmp)-1
Set @iLoop = 1
While @iLoop <= @iPos and @iTmp > 0
begin
Set @iTmp = @iTmp * 16
Set @iLoop = @iLoop + 1
end
Set @result = @result + @iTmp
Set @iLoop = @iLoop + 1
Set @iPos = @iPos + 1
End
return @result
END
GO

Ke 2013-11-08 16:54 发表评论

存储�q�程递归调用�?游标的��用注意事��?

Ke — Tue, 14 May 2013 09:17:00 GMT
注意�Q?/span>必须把游标声明�ؓ局部的�Q�即加上local

CREATE PROCEDURE [dbo].[p_expand_k3_bom]
@p_itemID int, @p_levelID int
WITH EXEC AS CALLER
AS
declare @v_itemID int
declare @v_levelID int
declare @v_itemNO varchar(20)
declare @v_itemName varchar(200)
declare @v_itemModel varchar(200)
declare @v_note1 varchar(20)
declare cursor_bom CURSOR LOCAL FOR select b.FItemID,c.FShortNumber, c.FName, c.FModel, b.FNote1
from AIS20120110144135.dbo.ICBOM a, AIS20120110144135.dbo.ICBOMChild b, AIS20120110144135.dbo.t_ICItem c
where a.FInterID = b.FInterID
and b.FItemID = c.FItemID
and a.FInterID = (select top 1 FInterID from AIS20120110144135.dbo.ICBOM where FItemID = @p_itemID)
and a.FItemID = @p_itemID
set @v_levelID = @p_levelID+1
open cursor_bom
fetch next from cursor_bom into @v_itemID, @v_itemNO, @v_itemName, @v_itemModel, @v_note1
while (@@FETCH_STATUS = 0)
begin
INSERT INTO k3_bom_info
(level_id, item_id, item_no, item_name, item_model, note_1)
VALUES (@v_levelID, @v_itemID, @v_itemNO, @v_itemName, @v_itemModel, @v_note1)

exec p_expand_k3_bom @v_itemID, @v_levelID

fetch next from cursor_bom into @v_itemID, @v_itemNO, @v_itemName, @v_itemModel, @v_note1
end
close cursor_bom
deallocate cursor_bom
GO

Ke 2013-05-14 17:17 发表评论

Openbravo Developers_Guide Notes

Ke — Fri, 03 May 2013 01:23:00 GMT

How to create a Table
http://wiki.openbravo.com/wiki/How_to_create_a_Table

The new table must include the AD_Client_ID, AD_Org_ID, IsActive, Created, CreatedBy, Updated and UpdatedBy fields that are mandatory and required for security and auditory purposes of the application.

Each table must have at least one column marked as an identifier. The actual values of identifier columns later get concatenated to be shown to the user as a representation of a particular record (see the link to the Sales Order within the Sales Invoice window). These identifiers will also be used to construct dropdown lists of records of that particular table. By default all columns with column name Name are set as an identifier. In case there is no column with this Name, no identifier is set and needs to be done so manually or compilation will fail.

NOTE: The columns that are named line or seqNo are used to contain the sequence number of a record (i.e. the number of a line in an invoice). They take a default value like:
@SQL=SELECT COALESCE(MAX(ColumnName),0)+10 AS DefaultValue FROM TableName WHERE xxParentColumn=@xxParentColumn@
The WHERE part of this clause needs to be replaced with the required values. The code that should appear here is the name of the column which links with the id of the parent one. For example, each record of the C_InvoiceLine belongs to a particular C_Invoice record and they are all sequenced. C_Invoice is the parent table for the lines saved in C_InvoiceLine. This table has a column named line and the default value that it takes is:
@SQL=SELECT COALESCE(MAX(LINE),0)+10 AS DefaultValue FROM C_INVOICELINE WHERE C_INVOICE_ID=@C_INVOICE_ID@

How to add Columns to a Table
http://wiki.openbravo.com/wiki/How_to_add_Columns_to_a_Table

These changes can be done in two different locations:

Add columns to the original module (dbprefix HT)
Create a second module (dbprefix HT2) which adds the columns to the first module

The first option can be chosen if the original module author wants to add more columns to his/her module. The second option is possible for anyone as the columns are added by a new module to the existing one which is not changed directly.
The main difference between these two methods is the names which need to be chosen for the columns to comply with the modularity naming rules.

Adding column to same module: Any valid column name can be picked
Via second module: New column name must comply to the pattern EM__ where must be the dbprefix if the new module contaning the column to be added. In this example: EM_HT2_
How to add a Constraint
http://wiki.openbravo.com/wiki/How_to_add_a_Constraint

In the Application Dictionary || Message window create a new record using the following details:

Module Openbravo Howtos 2 as this is the module containing the constraint also.
Search key: The search key must be exactly the same as the constraint's one, in this case em_ht2_ht_salary_dates_chk as this is the link between the constraint and the message.

Message type: Depending on the type the UI for the message box will be different (green for success, yellow for warning...), in our case we want a red error message box, so we select Error.
Message text: It is the user friendly message that will be displayed inside the message box. So let's enter: The Valid To date may not be before the Valid From date.

Creating a new instance of a Business Object

http://wiki.openbravo.com/wiki/How_to_work_with_the_Data_Access_Layer#A_.27Hello_World.27_Example

A business object may never be created using the Java new operator. All business objects should be created using the OBProvider factory class:

// create the object through the factory final Category bpg = OBProvider.getInstance().get(Category.class);

Hibernate will detect that a business object is new when:

the id of the business object is not set
when the flag newOBObject is set to true explicitly

So if you want to create a new business object with a specific id (by calling setId(...)) then you explicitly need to call businessObject.setNewOBObject(true). Otherwise, Hibernate will throw an exception ('count of batch update operation....').

Ke 2013-05-03 09:23 发表评论

redhat 9.0,提示Determining IP information for eth0... failed; no link present. Check cable?

Ke — Thu, 02 May 2013 08:27:00 GMT
redhat 9.0,提示Determining IP information for eth0... failed; no link present. Check cable?无法�Ȁ�zȝ��l�设备eth0
我搜的相兌��x��案�ؓ�Q?nbsp;
�?etc/sysconfig/network-scripts/ifcfg-eth
/etc/sysconfig/networking/devices/ifcfg-eth 其中表示Ethernet adapter的标识数字，一般�ؓ0。当为零的时候，��是
/etc/sysconfig/network-scripts/ifcfg-eth0
/etc/sysconfig/networking/devices/ifcfg-eth0 �q�两个文件中加入

check_link_down () {
return 1;
}

Ke 2013-05-02 16:27 发表评论

具体分析tftp server配置的步�?�?

Ke — Thu, 25 Apr 2013 06:57:00 GMT

转自�Q?a >http://network.51cto.com/art/201009/225534.htm

在Linux�pȝ��中，我们依然可以�q�行tftp server配置的操作。可能对于熟悉窗口操作的朋友�Q�对于命令操作有些不熟悉�Q�没关系�q�里我们��来讲解一下Linux 下的tftp-server配置的命令操作。TFTP是用来下载远�E�文件的最��单网�l�协�?它其于UDP协议而实�?嵌入式linux的tftp开发环境包括两个方�?
一是linux服务器端的tftp-server支持,
二是嵌入式目标系�l�的tftp-client支持.
因�ؓu-boot本��n内置支持tftp-client,所以嵌入式目标�pȝ��端就不用配置�?
下面��p��l�介�l�一下linux服务器端tftp server配置.在redhat 9.0的第三张光盘�?有tftp-server的安装rpm�?�Q?�Q?nbsp;      安装
#mount –t iso9660 /dev/hdc /mnt/cdrom    //挂蝲光盘
#rpm -ivh tftp-server-0.32-4.i386.rpm              //安装
#umount /mnt/cdrom                                          //卸蝲光盘
�Q?�Q�修�Ҏ��件在linux�?不管使用的是哪一�U�super-server,inetd或者xinetd,默认情况下TFTP服务是禁用的,所以要修改文�g来开启服�?
�Ҏ��Q?�Q�的安装�Ҏ��,可以修改文�g/etc/xinetd.d/tftp.主要是设�|�TFTP服务器的根目�?开启服�?
修改后的文�g如下:
service tftp {
socket_type            =dgram
protocol                  =udp
wait                        =yes
user                        =root
server                     =/usr/sbin/in.tftpd
server_args             =-s /home/app -c
disable                    =no
per_source             =11
cps                         =100 2
flags                       =IPv4
}
说明:修改��server_args= -s         -c,其中处可以改��Z��的tftp server配置的根目录,参数-s指定chroot,-c指定了可以创建文�?
�Q?�Q�创建tftp根目�?关闭防火�?启动tftp-server.
#mkdir /home/app
#chmod o+w       /home/app
#/etc/init.d/iptables stop        //关闭防火�?/p>
#service xinetd restart          //重启 xinetd 服务
重启xinetd服务,因�ؓTFTP服务受控与xinetd, xinetd是管服务的服�?它是不开端口�?
验证一下TFTP是否��h��?
# netstat -nlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:32768 0.0.0.0:* LISTEN 3122/rpc.statd
tcp 0 0 127.0.0.1:32781 0.0.0.0:* LISTEN 4035/xinetd
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 3103/portmap
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 3324/httpd
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 3255/sshd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 3213/cupsd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 3295/sendmail: acce
tcp 0 0 127.0.0.1:6010 0.0.0.0:* LISTEN 3415/0
tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN 3324/httpd
udp 0 0 0.0.0.0:32768 0.0.0.0:* 3122/rpc.statd
udp 0 0 0.0.0.0:69 0.0.0.0:* 4035/xinetd   ;
可以看到69端口已经打开
udp 0 0 0.0.0.0:69 0.0.0.0:* 4012/in.tftpd
udp 0 0 0.0.0.0:111 0.0.0.0:* 3103/portmap
udp 0 0 0.0.0.0:754 0.0.0.0:* 3122/rpc.statd
udp 0 0 0.0.0.0:631 0.0.0.0:* 3213/cupsd
�q�样,tftp server配置的启动步骤就完成了�?/p>
你可以登陆本机测试以�?命��o如下:
#tftp     your-ip-address
tftp>get
tftp>put
tftp>q

Ke 2013-04-25 14:57 发表评论

Ke — Fri, 15 Mar 2013 07:04:00 GMT

朋友�~�写一个dll,�~�译时��d��?/div>
"nafxcwd.lib(dllmodul.obj) : error LNK2005: _DllMain@12..."错误!

后发现是,其创建dll旉��择的时不��用MFC,而后来工�E�中又添加了与MFC相关的东�?/strong>.才引起上�q�问�?

采用如下步骤解决此问�?

1.��工�E�设�|�中改�ؓ"动态��用MFC"

2.到C++讄��中,看到Preprocessor Definitions�~�辑框中同时存在_USRDLL和_AFXDLL, 删除_USRDLL卛_��.

转自�Q?a >http://blog.csdn.net/train_z/article/details/3118754

��认解决了问题，但步�?�Q�我使用的是“静态MFC”

Ke 2013-03-15 15:04 发表评论

Ke — Wed, 13 Mar 2013 10:59:00 GMT

动态调用DLL
通过
LoadLibrary
GetProcAddress
FreeLibrary实现�?/p>
原因 �Q�工�E�只支持UNICODE字符

解决�Ҏ��Q?/p>
工程属�?>配置属�?#8211;>常规—>字符�?#8212;->使用多字节符字符�?/strong>

Ke 2013-03-13 18:59 发表评论

c++调用c#的dll�Q��{�Q?

Ke — Tue, 12 Mar 2013 07:13:00 GMT

一、��?clr�~�译MFC可执行文件或规则C# DLL函数.
    1、打开“��目属�?#8221;对话框，�Ҏ��是右键单�?#8220;解决�Ҏ��资源��理�?#8221;中的��目�q��择“属�?#8221;�?br />    2、展开“配置属�?#8221;旁边的节点�ƈ选择“常规”。在右侧�H�格中的“��目默认�?#8221;下，��?#8220;公共语言�q�行库支�?#8221;讄��?strong>“公共语言�q�行库支持（/clr�Q?#8221;�?br />    3、在相同的窗��g��Q�确保将“MFC的��?#8221;讄��?#8220;在共享DLL中��用MFC”�?br />    4、在“配置属�?#8221;下，展开“C/C++”旁边的节点�ƈ选择“常规”。请��保��?#8220;调试信息格式”讄��?#8220;�E�序数据�?Zi”�Q�而不�?#8220;/ZI”�Q��?br />    5、在“配置属�?#8221;下，选择“C/C++”�Q�然后选择“代码生成”。请��保��?#8220;�q�行时库”讄��?#8220;多线�E�调试DLL�Q?MDd�Q?#8221;�?#8220;多线�E�DLL�Q?MD�Q?#8221;之一�?br />二、在代码引用需要的dll.
using .
using "DownloaFiles.dll"   //换成需要的dll文�g�?/strong>
using namespace System�Q?
using namespace ADMessage_test�Q?nbsp; //换成dll中类所使用的namespace.
三、在C# DLL函数调用代码前加�?pragma managed
    �q�是manage和unmanage混合�~�程在MFC下的一�U�实现方式�?br />    以上介绍C++调用C# DLL函数�Q�希望对你有所帮助�?/p>
�?、几点要��C��Q?/p>
　　1 使用#using引用C# DLL�Q�而不�?include.我就是想当然的��用了后者，所以浪费了一上午的时��_��

　　2 别忘了using namespace CSLib�Q?/p>
　　3 使用C++/clr语法�Q�采用正��的讉K��托管对象�Q�即�Q��用帽�?#8216;^’�Q�而不是星�?#8216;*’�?br />

PS�Q�附上自己成功运行C++代码

#include "stdafx.h"
#include
//#using "..\..\SFCSDLL.dll" //叛_��目-->引用...�Q�添加新引用�Q�将DLL��d��到项目中�Q�可以不用此行代�?/p>
using namespace std;
using namespace SFCSDLL;

int _tmain(int argc, _TCHAR* argv[])
{
Class1 ^c = gcnew Class1();

c->SFCSDLL_Create_Connection("127.0.0.1", 0, 0, 0, 0);
c->SFCSDLL_Get_DLLVersion();
c->SFCSDLL_Close_Connection();

cout<<"end...";
system("pause");
return 0;
}

Ke 2013-03-12 15:13 发表评论

Ke — Tue, 26 Feb 2013 02:00:00 GMT



Ke 2013-02-26 10:00 发表评论

Ke — Tue, 11 Dec 2012 06:54:00 GMT

�|�上最常见的做法是�?/span>DataGridView�?/span>RowPostPaint事�g�?/span>RowHeaderCell中绘制行��P��

privatevoiddataGridView1_RowPostPaint(objectsender, DataGridViewRowPostPaintEventArgs e)
         {
            try
             {

       e.Graphics.DrawString((e.RowIndex + 1).ToString(), e.InheritedRowStyle.Font, new SolidBrush(Color.CadetBlue), e.RowBounds.Location.X + 15, e.RowBounds.Location.Y + 5);
             }
            catch(Exception ex)
             {
                 MessageBox.Show("��d��行号时发生错误，错误信息�Q?/span>"+ex.Message, "操作��p�|");
             }
         }

但是�q�种�Ҏ��在大数据量的时候性能比较差，每次滚动数据都会触发RowPostPaint事�g�?/span>

Ke 2012-12-11 14:54 发表评论

VS2008 自动生成属性的get、set

Ke — Fri, 16 Nov 2012 01:34:00 GMT

在VS2008里，也可以像Eclipse那样自动生成get 、set�Ҏ��?br />
下面是两个具体操作的�Ҏ��Q?br />

1、在�~�写的字�D�上单击右键----->重构------->��装字段

2、在�I�白行处�Q�输�?#8220;prop”再按Tab�?/p>

Ke 2012-11-16 09:34 发表评论

Ke — Mon, 12 Nov 2012 08:19:00 GMT

原文�Q?a >http://hi.baidu.com/einsteinalbert/item/b0366529705c5cfb51fd87ee

有两�U�方法：

�W�一步：使用SQL语句查询

select @@version

查询�l�果如下�Q?/p>
Microsoft SQL Server   2000 - 8.00.2039 (Intel X86)
   May   3 2005 23:18:38
   Copyright (c) 1988-2003 Microsoft Corporation
   Personal Edition on Windows NT 5.1 (Build 2600: Service Pack 2)

其实在C:\Program Files\Microsoft SQL Server\MSSQL\Binn\sqlservr.exe
点击鼠标右键查看版本也能得到�Q�不�q�信息比较简单而已�?.00.2039��׃��表安装的SQL Server的版本了。对应以下的表格�Q�可以查出来具体对应的补丁版本�?strong style="color: #ff0000">8.00.2039表示安装了SP4�Q?.00.760表示安装了SP3�?br />
�W�二步：对照表格查找具体的补丁版�?/strong>

SQL Server Versions

@Version SQL Server Version Released

6.50.201 SQL Server 6.5 RTM
6.50.213 SQL Server 6.5 with Service Pack 1
6.50.240 SQL Server 6.5 with Service Pack 2
6.50.258 SQL Server 6.5 with Service Pack 3
6.50.281 SQL Server 6.5 with Service Pack 4
6.50.415 SQL Server 6.5 with Service Pack 5
6.50.416 SQL Server 6.5 with Service Pack 5a
7.00.623 SQL Server 7.0 / MSDE 1.0 RTM
7.00.699 SQL Server 7.0 SP1 July 1999
7.00.842 SQL Server 7.0 SP2 March 20th, 2000
7.00.961 SQL Server 7.0 SP3 December 15th, 2000
7.00.1063 SQL Server 7.0 SP4
8.00.194 SQL Server 2000 RTM
8.00.384 SQL Server 2000 SP1
8.00.534 SQL Server 2000 SP2 November 30th, 2001
8.00.760 SQL Server 2000 SP3
8.00.2039 SQL Server 2000 SP4

更多的版本对照表�Q?br />
For SQL Server 8

Main Releases
@@version Version and Service Pack
8.00.2039 Service Pack 4
8.00.760 Service Pack 3
8.00.534 Service Pack 2
8.00.384 Service Pack 1
8.00.194 RTM

All Releases
@@version Version and Service Pack
8.00.2039 Service Pack 4
8.00.760 Service Pack 3
8.00.686 SP 2 + Q316333
8.00.679 SP 2 + Q316333
8.00.665 SP 2 + Q316333
8.00.655 SP 2 + Q316333
8.00.650 SP 2 + Q316333
8.00.644 SP 2 + Q324186
8.00.608 SP 2 + Q316333/Q356326/Q356938
8.00.578 SP 2 + Q316333
8.00.534 Service Pack 2
8.00.532 Service Pack 2 Beta
8.00.452 SP 1 + Q308547
8.00.444 SP 1 + Q308547/Q307655
8.00.443 SP 1 + Q307538
8.00.428 SP 1 + Q304850
8.00.384 Service Pack 1
8.00.287 Q297209
8.00.251 Q300194
8.00.250 Q291683
8.00.249 Q288122
8.00.239 Q285290
8.00.233 Q282416
8.00.231 Q282279
8.00.226 Q278239
8.00.225 Q281663
8.00.223 Q280380
8.00.222 Q281769
8.00.218 Q279183
8.00.217 Q279293/Q279296
8.00.211 Q276329
8.00.210 Q275900
8.00.205 Q274330
8.00.204 Q274329
8.00.194 RTM(SQL Server 8 with no service pack applied)

For SQL Server 7

Main Releases
@@version Version and Service Pack
7.00.1063 SQL Server 7 with Service Pack 4
7.00.961 SQL Server 7 with Service Pack 3
7.00.842 SQL Server 7 with Service Pack 2
7.00.699 SQL Server 7 with Service Pack 1
7.00.623 SQL Server 7 with no service pack applied

For SQL Server 6.5

Main Releases
@@version Version and Service Pack
6.50.479 SQL Server 6.5 with Service Pack 5a (updated)
6.50.416 SQL Server 6.5 with Service Pack 5a.
6.50.415 SQL Server 6.5 with Service Pack 5
6.50.281 SQL Server 6.5 with Service Pack 4
6.50.258 SQL Server 6.5 with Service Pack 3
6.50.240 SQL Server 6.5 with Service Pack 2
6.50.213 SQL Server 6.5 with Service Pack 1
6.50.201 SQL Server 6.5 with no service pack applied

For SQL Server 6

Main Releases
@@version Version and Service Pack
6.00.151 SQL Server 6 with Service Pack 3
6.00.139 SQL Server 6 with Service Pack 2
6.00.124 SQL Server 6 with Service Pack 1
6.00.121 SQL Server 6 with no service pack applied

补充
For SQL Server 2005
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