sql declare cursor

A MS-SQL cursor is a temporary database object that is used to rotate copies of data rows stored in a system Permanent Table, it can also point to the data row stored in the system Permanent Table. A cursor provides you with a method to operate data in a table on a row-by-row basis instead of a result set. 1. How to use a cursor1) define the

A major reason for using cursor is to convert the set operation into a single record processing method. After retrieving data from a database using SQL, the results are stored in a memory area, and the results are often a collection containing multiple records. The cursor mechanism allows you to access these records row by row in

processing methods. 1.2 cursor typeMs SQL Server supports three types of cursors: transact_ SQL, API server, and customer cursors.(1) transact_ SQL cursorTransact_ SQL cursor is defined by the

Tags: using ar strong SP div Art C on RAdd a variable to the SQL statement.DECLARE @local_variable data_typeDeclaration requires the type of the variable to be specified.can use set and select to assign a value to a variable,You can use @local_variable to invoke variables in SQL statementsA value can be supplied in the declaration, otherwise all variables are initialized to null after the declaration.For ex

Add a variable to the SQL statement.DECLARE @local_variable data_typeDeclaration requires the type of the variable to be specified.can use set and select to assign a value to a variable,You can use @local_variable to invoke variables in SQL statementsA value can be supplied in the declaration, otherwise all variables are initialized to null after the declaration.For example:

Tags: fetch data from cursor close HTM tar requires cat ZhaHttp://www.cnblogs.com/Gavinzhao/archive/2010/07/14/1777644.html 1The Table1 structure is as follows2IdInt3Namevarchar(50)45Declare@idInt6Declare@namevarchar(50)7DeclareCursor1CursorFor--Defining Cursors Cursor18Select*FromTable1--Objects using cursors (fill in select text as required)9OpenCursor1--Open cursor1011FetchNextFromCursor1Into@id,@name--Move the

SQL Server supports three types of cursors: Client cursor API server cursor T-SQL cursor The main difference between T-SQL cursors and other types of cursors is that they are used differently.The T-

StudentV_sql_create:='CREATE TABLE'||V_table||'(ID number,age number)'; Executeimmediate v_sql_create; Commit; --Insert data to student LoopExit whenV_number0; V_number:=V_number-1; Insert intoStudentValues(V_id,v_age); V_ID:=v_id+1; V_age:=V_age+1; V_i:=V_i+1; --commit/10000 Line Data ifMoD (V_i,10000)=0 Then SelectTo_char (Sysdate,'YYYY-MM-DD Hh24:mi:ss') intoV_exec_time fromdual; Dbms_output.put_line (V_i||' '||v_exec_time); Commit; End if; EndLoop; SelectTo_ch

management system and the line-oriented programming of the two linked together, so that two data processing methods can communicate. 1.2 Cursor Types MS SQL Server supports three types of cursors:transact_sql cursors ,API server Cursors , and client cursors . (1) Transact_sql cursors TRANSACT_SQL cursors are defined by the DECLARE

. Defining a record variable based on a cursor is more convenient than declaring a record type variable and is not prone to error. Example: DECLARE--Defining cursorsCURSOR Emp_cursor is SELECT ename,sal from EMP;EMP_REOCRD emp_cursor%rowtype;--cursor VariableBEGIN--Open cursorOPEN Emp_cursor;LOOP--Get RecordsFETCH emp_cursor into Emp_record;EXIT when Emp_record