cursor分为三种,一是直接声明为cursor变量,二是首先声明类型再声明变量,三是声明为sys_refcursor。 (1)直接声明 declare cursor emp_cur is select * from emp; emp_record emp%rowtype; begin open emp_cur; loop fetch emp_cur into emp_record; exit when emp_cur%notfound; dbms_output.put_line('name...
TYPE ref_cursor IS REF CURSOR RETURN my_table%ROWTYPE; my_cursor ref_cursor; my_record my_table%ROWTYPE; BEGIN OPEN my_cursor FOR SELECT column1, column2 FROM my_table WHERE condition; LOOP FETCH my_cursor INTO my_record; EXIT WHEN my_cursor%NOTFOUND; -- 在此处处理每一行数据,例如输出...
Fetch Into 通常用于存储过程中,使用游标处理一个或多个结果集。 Fetch Into 语句的语法如下: FETCH {cursor_name | :host_cursor_variable} INTO {variable_list | record}; 其中: - cursor_name: 必须是指向已声明的游标的标识符。 - host_cursor_variable: 必须是程序中包含游标的外部主机变量。 - variable...
v_record cursor_name%ROWTYPE; (3)集合变量:CURSOR cursor_name IS SELECT ... FROM ... ; TYPE type_name IS TABLE OF cursor_name%ROWTYPE INDEX BY BINARY_INTEGER; v_table type_name ; 四 类型 Cursor类型包含三种: 隐式Cursor,显式Cursor和Ref Cursor(动态Cursor)。 1、 隐式Cursor: (1)说明:...
FETCH 游标名 INTO 变量名1[,变量名2...]; 或 FETCH 游标名 INTO 记录变量; 游标打开后有一个指针指向数据区,FETCH语句一次返回指针所指的一行数据,要返回多行需重复执行,可以使用循环语句来实现。控制循环可以通过判断游标的属性来进行。 下面对这两种格式进行说明: ...
PLSQL中RECORD和CURSOR 结合的小例子 开始 SETSERVEROUTPUTON;DECLAREv_empno emp.empno%TYPE; v_ename emp.ename%TYPE;CURSORemp_cursorISSELECTempno,enamefromempwhereempno<>1000; emp_record emp_cursor%ROWTYPE;BEGINLOOPIFNOTemp_cursor%ISOPENTHENOPENemp_cursor;ENDIF;FETCHemp_cursorINTOemp_record;EXITWHEN...
这里严格按照显示游标的书写规则:DECLARE emp_cursor定义游标OPEN emp_cursor打开游标FETCH emp_cursor INTO...提取数据CLOSE emp_cursor关闭游标,因为提取出来的数据属于多行,所以通过loop循环打印即可。 Example2:检验游标是否打开,如果打开显示提取行数 DECLARE CURSOR emp_cursor IS SELECT empno,ename,job FROM emp...
sec@ora10g> DECLARE 2 CURSOR cur IS 3 SELECT * FROM t_ref; 4 TYPE rec IS TABLE OF t_ref%ROWTYPE; 5 recs rec; 6 BEGIN 7 OPEN cur; 8 WHILE (TRUE) LOOP 9 FETCH cur BULK COLLECT 10 INTO recs LIMIT 100; 11 FORALL i IN 1 .. recs.COUNT 12 INSERT INTO t VALUES recs (i); ...
PROCEDURE SP_TEST_PROC IS v_cursor_name SYS_REFCURSOR ; --变量定义 BEGIN OPEN v_cursor_name FOR 查询语句; LOOP FETCH v_cursor_name INTO 变量1, 变量2, ..., 变量N; --变量个数和查询结果记录包含的字段数量保持一致 EXIT WHEN v_cursor_name%NOTFOUND; END LOOP; CLOSE v_cursor_name; END...
The following PL/pgSQL code uses a loop to fetch all rows from the cursor and then exit after the last record is fetched (usingEXIT WHEN NOT FOUND). DO $$ DECLARE c3 CURSOR FOR SELECT * FROM employees; rowvar employees%ROWTYPE; BEGIN OPEN c3; LOOP FETCH FROM c3 INTO ...