You would use aCURSOR FOR Loopwhen you want to fetch and process every record in a cursor. TheCURSOR FOR Loopwill terminate when all of the records in the cursor have been fetched. 译:当你每次想通过cursor来对每条记录进行取
Introduction to PL/SQL cursor FOR LOOP statement# The cursorFOR LOOPstatement is an elegant extension of the numericFOR LOOPstatement. The numericFOR LOOPexecutes the body of a loop once for every integer value in a specified range. Similarly, the cursorFOR LOOPexecutes the body of the loop ...
Open the cursor. Fetch from the cursor into the record. Detect last record fetched in cursor. Close the cursor. All these steps are performed automatically by PL/SQL which means you write less code and you have fewer opportunities for bugs. Only use the cursor FOR loop when you want to p...
代码语言:plsql 复制 DECLARE -- 声明变量 v_column1 table_name.column1%TYPE; v_column2 table_name.column2%TYPE; BEGIN -- 外层循环 FOR outer_cursor IN (SELECT * FROM table_name) LOOP -- 获取外层循环的值 v_column1 := outer_cursor.column1; v_column2 := outer_cursor.column2; -- 内层...
FETCH cursor_name INTO var_name [, var_name] ...--执行SQL语句 --关闭游标 CLOSE cursor_name --使用hr/123456登录,employees表数据 --查询前10名员工的信息 方法一:隐式游标 BEGIN FOR c IN (SELECT * FROM employees WHERE ROWNUM<=10) LOOP DBMS_OUTPUT.PUT_LINE(c.employee_id||' '||c.fir...
END LOOP; END display_multiple_years; 当知道循环范围时可用,循环变量在loop范围内有效,为number类型,plsql隐式定义,会为其自动加1. 当要从游标或select语句取出全部的记录时,可用。循环变量类型为cursor_name%rowtype,plsql隐式定义。 用cursor for loop即简洁又清晰,如: ...
end loop_num_for; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 复制代码 这种循环在开始的时候就已经知道循环的次数了,注意这里不需要声明循环索引,因为PL/SQL会自动隐式的用一个integer类型的局部变量作为它的循环索引; ...
PLSQL 循环游标 cursor loop fetch into PLSQL 循环游标 cursor 的一点心得体会 set serveroutput on---打印输出信息，默认是FALSE declare ---申明变量，分号结束 v_pages number;v_numberPerPage number;v_totalPages number;v_cur sys_refcursor;diy_id number;diy_name varchar2(50);diy_date date;cur...
FOR record_name IN cursor_name LOOP statement1; statement2; . . . END LOOP; 1. 2. 3. 4. 5. 在语法中: •record_name是隐式声明的记录的名称(作为cursor_name%ROWTYPE) •cursor_name是先前声明的游标的PL / SQL标识符 注意:v_emp_record是隐式声明的记录。
cursormycursorisselect*fromcat; begin openmycursor; loop fetchmycursorintov_tablename,v_tabletype; null;--youcanusetablenameandv_tabletype endloop; closemycursor; endStudyCursor; 最近在看代码是,发现其实我们还有一个更方便的方法就是使用for in loop … end loop ...