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The practice of data Warehouse based on Hadoop ecosystem--etl (i)

supportedWorkarounds such as SQOOP1. 3. Extracting Data using SqoopIn this example, you use SQOOP1 to extract data from the MySQL library to hive.There are two ways to import data from the source to the Data Warehouse (RDS in this example), you can fetch the data from the source (pull), or you can request the source to send (push) the data to the Data warehouse. An important factor affecting the choice of data extraction method is the availability and volume of the operational system,

Windows programming FAQ

)B) understand the MFC framework and MFC class levels;Master the features and usage of basic classes(Cwinapp; cwnd; cstring; CDC; cpoint; crect; cdocument; cview; carchive; cdialog; cedit; cbutton; clistbox; cControl)C) In addition to the basic process-based debugging methods (for local debugging), the basic event-based debugging methods (SPY ++; trace; Assert) are supplemented and learned)D)Master some key points: Document view (DOC/view) structure;

"Cute Python" reading notes (iv)

keep denying yourself, but stick to the original will. Small White has implemented the "store the disc content index as a *.cdc text file on your hard disk" and obtained a command-line tool-like program that can be called from the command linepythonpycdc.pyw-e test .txtQuickly specify a file name.Like grep, now to implement the search function, open all the required files, read each row, if there is a specified keyword in line to print output to the s

Display the mat image matrix showmatimgtownd (getdlgitem (idc_showimg) and matframe) of opencv in MFC );

Learn first, then transform, standard coders, haha Original article address: Http://www.cnblogs.com/yuanzfy/archive/2012/06/21/2557957.html Using GDI +, You can conveniently display the image matrix data of opencv In the MFC window. Void bitmattownd (cwnd * WND, CV: mat IMG, crect * ROI) {If (IMG. empty () return; CDC * CDC = WND-> getdc (); CDC memdc; // firs

GDI Summary 2: Drawing bitmap

One feature of GDI is that all images are drawn through DC. DC can communicate with each other. The graphs in the two DC use DC ---> DC to transmit information to each other. Regardless Bitmap ---> Screen Bitmap ---> bitmap Screen ----> bitmap Screen -----> Screen They all use the transfer between DC> DC. The key point is: How to obtain their respective DC For screens: You can directly use getdc () releasedc () : Getdc () returns the CDC * For imag

Conversion of Visual C + + underlying data types

16.1 How to convert a base data type to a CString typeUsing the Format method of CStringvoid CDemoView::OnDraw(CDC* pDC){ int a = 100; double b = 1.23; //将整型转换成CString CString str1 = _T(""); str1.Format(_T("%d"), a); //将实型转换成CString CString str2 = _T(""); str2.Format(_T("%f"), b); CString strText = _T(""); strText.Format(_T("str1 = %s"), str1); pDC->TextOut(100, 50, strText); strText.Format(_T("str2 = %s"), str2);

USB virtual serial port

USB is faulty. Therefore, the embedded system should be directly connected to the PC through the USB Bus Interface (through the on-Chip USB interface or the On-Chip USB interface chip), and the MCU can directly complete the protocol conversion of the USB virtual serial port. In the USB standard subclass, there is a type of protocol called CDC that can implement virtual serial port communication, and most operating systems (Windows and Linux) the devi

Bitmap read/write

(); Public:Hbitmap m_hbitmap;Lpbyte m_lpdibits; // start position of the dib bitLpbitmapinfoheader m_lpbmphdr; // bitmapinfoheader InformationLpvoid m_lpvcolortable; // color table informationHpalette m_hpalette; // palette PRIVATE:DWORD m_dwimagesize; // the bit of a non-bitmapinfoheader or bitmapfileheaderInt m_ncolorentries; // Number of color table items // Display parametersPublic:Cpoint m_dest; // coordinates of the upper left corner of the target rectangleCsize m_destsize; // displa

Research on data synchronization algorithm (good blog

, reduce backup windows, green energy saving. 4. Data Synchronization algorithmIf rsync assumes that there are now two computers alpha and beta, computer alpha can access a file, the computer can have beta access to B files, files A and B are very similar, and computer alpha and beta are interconnected by slow networks. Data synchronization algorithm based on Dedupe technology The approximate flow is similar to rsync, briefly described as follows:1, the beta data segmentation algorithm, such as

ORA-03114 PLSQL process compilation disconnection Error

Oracledata database objects are ineffective, through plsqldev.exe program for package compilation; Reported ORA-03114: database connection failure error. Oracle DB version: 9.2.0.1 Cause of failure: the PLSQLDev.exe program conflicts with the CDC function of the Oracle database. Other client tools such as TOAD and OEM do not have the above situation. Troubleshooting: Drop trigger sys. cdc_alter_ctable_before;Drop trigger sys. cdc_create_ctable_after;D

Visual c ++ programming skills (II)

49. How to implement a rubber rectangle Crecttracker is a very useful class. You can call crecttracker: trackrubberband to respond to the wm_lbuttondown message to create a rubber rectangle. The following example shows that it is easy to use crecttracker to move and reset the blue oval size in the window. First, declare a crecttracker data member in the file: Class csampleview: Public cview { ... Public: Crecttracker m_tracker; ... }; Second, initialize the crecttracker object in the constructo

Cstatic control background transparent instance code

Blog transfer: http://vivianke.blog.163.com/blog/static/29715271200781121358317/ Note:1. the background of the cstatic control is transparent. You must first derive a class from cstatic. In this class, afx_msg hbrush ctlcolor (CDC * PDC, uint nctlcolor) is a reflection function that processes messages of = wm_ctlolor, message ing macro: on_wm_ctlcolor_reflect (),2. afx_msg hbrush onctlcolor (CDC * PDC, cwn

Clipboard operation of VC

clipboard is very useful and easy to implement. The following code shows how to copy an extended Metafile to the clipboard: If (openclipboard ());{Emptyclipboard (); // Create a Metafile DCCmetafiledc * CDC = new cmetafiledc ();CDC-> createenhanced (getdc (), null, null, "the_name "); // Call the plotting routine // Close cmetafiledc and obtain its handleHenhmetafile handle =

Operations on clipboard in C ++

I. Text Content operations The following code demonstrates how to copy text content to the clipboard: Cstring source;// Save the text content in the source variableIf (openclipboard ()){Hglobal clipbuffer;Char * buffer;Emptyclipboard ();Clipbuffer = globalalloc (gmem_ddeshare, dource. getlength () + 1 );Buffer = (char *) globallock (clipbuffer );Strcpy (buffer, lpcstr (source ));Globalunlock (clipbuffer );Setclipboarddata (cf_text, clipbuffer );Closeclipboard ();} The following code shows how t

VC clipboard operation

Data Operations Reading and Writing image data on the clipboard is very useful and easy to implement. The following code shows how to copy an extended Metafile to the clipboard: If (openclipboard ());{Emptyclipboard (); // Create a Metafile DCCmetafiledc * CDC = new cmetafiledc ();CDC-> createenhanced (getdc (), null, null, "the_name "); // Call the plotting routine // Close cmetafiledc and obtai

Analysis of the change Data capture function of SQL 2008

for log audit, but Microsoft has a tighter control over the API, and only the core partners who have signed a bunch of protocols can understand the API. As a result, the current tracking of business data updates has always been a headache for the SQL Server platform, and users need to make a choice between putting in a lot of development effort and investing in additional procurement costs. Fortunately, Microsoft has finally provided a set of audit log mechanisms in SQL Server 2008, the change

A table cannot be truncate in SQL _sever.

Truncate table t_test: Message 4711, level 16, status 1, 1st rows The table 't_ test' cannot be truncated because it has been published for replication. Error table forwarding from http://technet.microsoft.com/zh-cn/library/cc645613 (V = SQL .105). aspx 4711 16 No The table '%. * ls' cannot be truncated because the table is published for replication or Change Data Capture is enabled. I checked it for a long time. There is one of the following solutions, but i

[MFC] SDI allows text to move with the mouse on the image background

location of the mouse. You can use the following method to find the corresponding coordinates: Xcoords == point.y; 3. Then we need to insert the text. It is very easy to insert the text at a specific position in SDI. You can use the CDC-> DrawText method. This function allows you to add formatted text in a specified rectangle, a bit like the insert dialog box in word. The syntax is as follows: DrawText( CString str, LPRECT lpRect, UINT nFormat); Th

The data increment extraction mechanism in ETL

MethodThis method can judge the changing data by analyzing the log of the database itself. Relational plow the database system will store all DML operations in the log file for the database backup and restore functions. ETL incremental extraction process through the analysis of the database log, extract the relevant source table after a certain time after the DML operation information, you can know since the last time the table data changes, so as to guide the incremental extraction action.Some

MFC drawing basics.

);Crect (point topleft, point bottomright ); The crect class has been overloaded with =, +,-, + =,-=, = ,! =, , |, =, | =, And other operators to support computation between the crect object and the crect, point, size, and rect object. We also define the Conversion characters "lpcrect" and "lprect" to automatically convert the crect object to the rectangular structure and class Pointer "lpcrect" and "lprect. You can call the ptinrect function of the crect class to determine whether a vert

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