打开一个游标 游标的内容为查询的结果集 如：open cursor for select * from table_name;目的就是遍历table_name这个表的每条数据。打开游标并取值
Oracle Database need not verify thata cursor is in the cache because it cannot be deallocated while an applicationcursor associated with it is open.
综上所述,任意一个经过解析的目标SQL一定会同时对应两个共享游标(Shared Cursor),一个是父游标(Parent Cursor),另一个则是子游标(Child Cursor),父游标会存储该SQL的SQL文本,而该SQL真正的可以被重用的解析树和执行计划则存储在子游标中。 Oracle中游标的分类如下所示:图3-13 Oracle中的游标分类 父游标和子游...
(1)If CURSOR_SPACE_FOR_TIMEis set to false (the default), then a cursor can be deallocated from the library cache regardless ofwhether application cursors associated with its SQL statement are open.In this case, Oracle Database must verify that the cursor containing the SQLstatement is in th...
SQL:2003 Syntax CallableStatement cs1 = conn.prepareCall ("{call proc (?,?)}"); CallableStatement cs2 = conn.prepareCall ("{? = call func (?,?)}"); Oracle Syntax CallableStatement cs1 = conn.prepareCall ("begin proc (:1,:2); end;"); CallableStatement cs2 = conn.prepareCall ("begin ...
RELEASE_CURSOR={YES|NO} * NO カーソル・キャッシュでSQL文を処理する方法 RUNOUTLINE NO データベースにアウトラインを作成します。 SELECT_ERROR={YES|NO}* YES SELECTエラーの処理の方法 SQLCHECK={FULL|SYNTAX|LIMITED|NONE}* SYNTAX 構文および意味のチェックの程度 STMT_CACHE...
cursor.execute("select name from v import cx_Oracle as cx con = cx.connect('ncc2020_0609', 'sys', '10.10.xx.xx:1521/orcl') # 创建连接 cursor = con.cursor() # 创...
SELECT course_number from courses_tbl where course_name = name_in; BEGIN open c1; fetch c1 into cnumber; if c1%notfound then cnumber := 9999; end if; close c1; RETURN cnumber; END; Cursor with parameters The basic syntax for a cursor with parameters is: ...
This method lets your program accept or build a dynamic query, then process it using the PREPARE command with the DECLARE, OPEN, FETCH, and CLOSE cursor commands. The number of select-list items, the number of placeholders for input host variables, and the datatypes of the input host ...
OPEN c3(var1 := 42); END$$; For the c3 cursor, supply the argument value expressions. If the cursor was not declared to take arguments, the arguments can be specified outside the cursor. DO $$ DECLARE var1 integer; c3 CURSOR FOR SELECT * FROM employees where id = v...