core midstream

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The use of the SQL Midstream label

before the end of the cursor and makes the returned row the new current Row. If N or @nvar is 0, the no rows are returned. n must be a integer constant and @nvar must be smallint, tinyint, or int. RELATIVE {n| @nvar}If N or @nvar is positive, returns the row n rows beyond the current row and makes the returned row the new current row. If N or @nvar is negative, returns the row n rows prior to the current row and makes the returned row the new current row. If N or @nvar is 0, returns the current

The use of the SQL Midstream label

Tags: style ar os using SP for data BS ADDECLARE @id intDECLARE @addTime datetimeDeclare cursor1 cursor for--defines a cursor Cursor1Select Id,addtime from Mr_examine--object with cursor (fill in select text as required)Open Cursor1--opening cursorsDECLARE @i intSet @i=1FETCH NEXT from the Cursor1 into @id, @addTime--moves the cursor down by 1 rows, gets the data into the previously defined variable @id, @nameWhile @ @fetch_status = 0--Determine if the data was successfully obtainedBeginif (@i>1

Oracle's use of midstream labels

Tags: Oracle cursors with parameters1)---The use of cursors with parameters;DeclareCURSOR stock_cur (symbol_in VARCHAR2) isSELECT * from RATE_COMBINE_NR nr WHERE nr.combine_no=symbol_in;Stock_info Stock_cur%rowtype;BeginOPEN stock_cur (' G600000001 '); --Open the cursor;LoopFETCH stock_cur into Stock_info; --Take a value from the cursorExit when Stock_cur%notfound;Dbms_output.put_line (stock_info.combine_no| | ' -' | | Stock_info.department_code);End Loop;Close stock_cur; --Close cursorEndThis a

The use of MySQL midstream target

fromArmforcewhereTroopsid=Temp_tid andArmtype=0; Select Number intoNum1 fromArmforcewhereTroopsid=Temp_tid andArmtype=1; Select Number intoNum2 fromArmforcewhereTroopsid=Temp_tid andArmtype=2; Select Number intoNum3 fromArmforcewhereTroopsid=Temp_tid andArmtype=3; UpdateArmforceSet Number= Number+Num0whereTroopsid=TId2 andArmtype=0; #退回军队Delete fromArmforcewhereTroopsid=Temp_tid andArmtype=0; #删除军队UpdateArmforceSet Number= Number+Num1whereTroopsid=TId2 andArmtype=1; Delete fromArmforc

Oracle midstream Standard, array usage

Tags: use of Oracle Midstream array1) SELECT * from Cnbs_security_role_menu for update;2) Oracle Midstream use: http://www.cnblogs.com/sc-xx/archive/2011/12/03/2275084.htmlDeclare--type definitionCursor C_job isSelect Combine_no,plan_code,flag from Rate_combine where plan_code= ' C01 ' and rownum --Define a cursor variableC_row C_job%rowtype;BeginOpen c_job;Loop--Fetch a row of data to C_rowFetch c_job into

Use of the SQL Server midstream label

Use of the SQL Server midstream label1. Cursors are row reads and consume more resources than SQL2. Cursor Usage Scenarios:A cursor is used in the existing system, and the query must be implemented by a cursorUse cursors when you have exhausted the while, subquery temporary tables, table variables, custom functions, and other methods that still cannot be implementedThe life cycle of the 3.t-sql is made up of 5 parts.Define cursor: Cursor definition fo

King concussion City how to flying midstream

daily amplitude, if you hold the stock daily shock amplitude within 3% that is inactive, if the stock of the best is the recent average daily amplitude of more than 5% of the stock, stocks active to make money, Stocks that do not move are easy to touch.Investors in the flying midstream to keep in mind the following points: first, do not blindly chase hot spots, because the shock of the general hot spot is not strong, and the second is not easy to cha

Use of SQL Midstream (RPM)

Deallocate auth_cur Example 2: Modifying and deleting data using cursors Declare auth_cur cursor Scroll for Select au_id, au_lname, au_fname, state From authors for update of au_lname Open Auth_cur DECLARE @rowcount int Set @rowcount = 6 Fetch absolute @rowcount from Auth_cur--sets the row identified by the variable @rowcount as the forward --The following 1 lines are modified using cursors Update authors set Au_lname= ' WHERE current of auth_cur--modifies the forward in the cursor --The follow

MYSQL Midstream, transaction, terminate stored Procedure method summary

itOPEN Cur_order; --Open cursorFETCH Cur_order into Intid,intuid,intpid,intoamount; --Using CursorsCLOSE Cur_order; --Close cursor The above is a simple cursor usage because only the first value is taken, so there is no use of the loop value, the basic use flow of the cursor: Define the cursor, open, use, close IF Num>0 ThenSET O_result = 3; --Mobile phone number already existsLEAVE Pro_begin; --This is the step out of the stored procedure and not continueEND IF; The following is the rollback

MySQL Midstream use case description (study notes)

; end$ Call P7 () $ Execution result is: Attachment:Test database and Data tables:CREATE TABLE category (cat_id smallint unsigned auto_increment primary key,Cat_name varchar (+) NOT null default ' ',parent_id smallint unsigned) engine MyISAM charset UTF8;INSERT into ' category ' VALUES(1, ' phone type ', 0),(2, ' CDMA phones ', 1),(3, ' GSM phone ', 1),(4, ' 3G phone ', 1),(5, ' dual-mode phone ', 1),(6, ' mobile phone accessories ', 0),(7, ' Charger ', 6),(8, ' headphones ', 6),(9, ' battery

How does SQL Server's midstream target handle data?

. Use the close statement to end the use of the cursor. Note: After you close the cursor, the cursor is still present and can be opened using the Open command, and only the call to the DEALLOCATE statement will be released completely. Client Cursors The cursor caches the entire result set on the client using the default result set, and all cursor operations are performed in the client's cache. Note: client-side cursors only support forward-only and static cursors. No other cursors are

The use of the SQL midstream standard is a

Label:@ @fetch_status DECLARE @id int Set @id = 1 DECLARE Cur1 CURSOR forSELECT EmployeeID From #table OPEN Cur1;FETCH NEXT from Cur1;While @ @FETCH_STATUS = 0 and @id = 0BEGINFETCH NEXT from Cur1;END;CLOSE Cur1;Deallocate Cur1;GO There is a problem with the bold sentence in the above example, when the value of the first value @id in the cursor does not meet the criteria, the @ @fetch_status value will not be 0. Note: return value 0 FETCH statement succeeded. The -1 FETCH statement failed

The use of the SQL Midstream label

Example 2: Modifying and deleting data using cursorsDeclareAuth_curcursorScroll for Selectau_id, au_lname, au_fname, state fromAuthors for Update ofau_lnameOpenAuth_curDeclare @rowcount int Set @rowcount = 6 FetchAbsolute@rowcount fromAuth_cur--set the row identified by the variable @rowcount to the current row --The following 1 lines are used to modify operations using cursors UpdateAuthorsSetau_lname='Zhang' where Current ofAuth_cur--to modify the current row in a cursor --The follo

Definition and use of SQL Midstream label

variable Cursor State variables:@ @fetch_status Cursor State0 successes-1 failures-2 lost@ @cursor_rows The number of rows in the result set in the cursorn Rows-1 cursor is a dynamic 0 empty set cursorTo manipulate the current line of the cursor:Current of cursor nameExample 1: Iterating through a query's dataset with a cursorUse pubs Go Declare @auid char, @aulname varchar, @aufname varchar, @st char (2), @auinfo varchar (50) DECLARE auth_cur cursor FOR Select au_id, au_lname, au_fname, state

Sail Soft Report Finereport data Connection Midstream standard Problem Solution Summary

mode) under the same memory configuration.open_cursors=6000000000-------------number of connections 45The number of open_cursors=300---------------------connections exceeds 500.From the above test, when the open_cursors expanded 20 million times times the number of connections into the original one-tenth, so the size of open_cursors to the number of connections is not small, as long as not on the tens increase, the general thousands of tens of thousands of and dozens of, the impact of the numbe

Sail Soft Report Finereport data Connection Midstream standard Problem Solution Summary

(exclusive mode) under the same memory configuration.open_cursors=6000000000-------------number of connections 45The number of open_cursors=300---------------------connections exceeds 500.From the above test, when the open_cursors expanded 20 million times times the number of connections into the original one-tenth, so the size of open_cursors to the number of connections is not small, as long as not on the tens increase, the general thousands of tens of thousands of and dozens of, the impact o

Use of the SQL midstream mark and the SQL mark

Use of the SQL midstream mark and the SQL markDeclare @ id intDeclare @ addTime datetimeDeclare cursor1 cursor for -- defines the cursor cursor1Select id, addtime from MR_Examine -- use the cursor object (enter select text as needed)Open cursor1 -- open a cursorDeclare @ I intSet @ I = 1Fetch next from cursor1 into @ id, @ addTime -- move the cursor down one row and put the obtained data in the defined variable @ id and @ name.While @ fetch_status = 0

Usage of the SQL midstream standard

Label:Cursors: is used to loop the table from top to bottom, and to concatenate values into strings.Example:The Dbo.titles table for the pubs database.1. Obtain the total price in the table: select sum from Dbo.titles2. But I want to get a result: Title, price.Proficient in asp,39 yuan; learning vc++,28; Java programming, 23 USDThe cursor is used:To declare a cursor:DECLARE Titprice CURSOR Fast_forward forSelect title, Price from Dbo.titles where priceTo open a cursor:Open TitpriceRecycled Mass

The use of MySQL midstream target

DECLARESalesvalINT;--Sales Variables DECLARECursalesCURSOR for SELECTDepartmentid,sales fromEmployeeInfo;--declaring Cursors DECLARE CONTINUEHANDLER for notFOUNDSETIsleave= 1;--an overflow is assigned a value of 1, which is the judgment of jumping out of the loop OPENCursales;--Open Cursor SETIsleave= 0; Cursales_loop:loopFETCHCursales intoDepid, Salesval; IFIsleave= 1 Then --End of CycleLEAVE Cursales_loop; ELSE UPDATEDepartmentinfoSETSales=Sales+SalesvalWHEREDepartmen

Definition analysis of Oracle Midstream Standard

Label:TYPE Type_cursor is REF cursor[RETURN Return_type];Cursor_name Type_cursor;Type type_cursor: Defines the types of variables such as I in int iIs ref CURSOR: Equivalent to a data type, but a data type that refers to a cursor. type int iThis variable is typically used when stored procedures and functions return a result set.Because PL/SQL does not allow a stored procedure or function to return a result set directly, you can return a type variable.A cursor is a buffer that the system raises t

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