Oracle Database need not verify thata cursor is in the cache because it cannot be deallocated while an applicationcursor associated with it is open.
示例2 Implicit Cursor FOR LOOP Statement In this example, an implicit cursor FOR LOOP statement prints the last name and job ID of every clerk whose manager has an ID greater than 120. BEGINFORitemIN(SELECTlast_name,job_idFROMemployeesWHEREjob_idLIKE'%CLERK%'ANDmanager_id>120ORDERBYlast_nam...
显式游标(Explicit Cursor):由程序员显式地声明、打开、关闭和操作的游标。 隐式游标(Implicit Cursor):Oracle数据库自动管理的游标,通常用于执行单条SQL语句,不需要显式声明。 本文将重点介绍显式游标的定义和使用方法。 三、显式游标的定义和使用 显式游标需要在PL/SQL代码中显式声明、打开、处理和关闭。下面是...
一个session cursor只能对应一个shared cursor,而一个shared cursor却可能同时对应多个session cursor。 当某个session cursor和其对应的shared cursor建立关联后,如果把cursor_space_for_time调成true,当一个session cursor处理完一条sql后,它就不会被destroy,Oracle会把其cache起来(我们称之为soft closed session curso...
Oracle数据库的Cursor类型包含三种: 静态游标:分为显式(explicit)游标和隐式(implicit)游标;REF游标:是一种引用类型,类似于指针。 --测试数据 createtablestudent(snonumberprimarykey,snamevarchar2(10));declareinumber:=1;beginwhilei<=50loopinsertintostudent(sno,sname)values(i,'name'||to_char(i)); ...
Example of Use an Implicit Cursor (FOR Loop Over Queries) DO $$ DECLARE item RECORD; BEGIN FOR item IN ( SELECT last_name, job_id FROM employees WHERE job_id LIKE '%MANAGER%' AND manager_id > 400 ORDER BY last_name ) LOOP RAISE NOTICE 'Name = %, Job=%', item...
注意:Oracle 會隱含開啟交易。 若要在 SQL Server 上模擬此行為,您必須在希望開始交易的位置手動新增BEGIN TRANSACTION陳述式。 或者,您可以在工作階段開頭執行SET IMPLICIT_TRANSACTIONS ON命令。 SSMA 會在使用自發交易轉換副常式時自動新增SET IMPLICIT_TRANSACTIONS ON。
Oracle implicitly opens a cursor to process each SQL statement not associated with an explicitly declared cursor. You can refer to the most recent implicit cursor as theSQLcursor. Although you cannot use theOPEN,FETCH, andCLOSEstatements to control theSQLcursor, you can use cursor attributes to ...
// C# public OracleRefCursor[] ImplicitRefCursors {get; set;} プロパティ値 OracleRefCursorsの配列 備考 このプロパティが移入されるのは、ExecuteNonQueryを通じてストアド・プロシージャが実行されるときのみです(他のシナリオで移入されることはありません)。 関連項目: 「Oracle.DataAcce...
For example, assume you want to insert a BFILE locator into a table, and you have an OraclePreparedStatement object ops to insert data into a table. The first column is a string (to designate a row number), the second column is a BFILE, and you have a valid oracle.sql.BFILE object ...