declarel_sqlvarchar2(123);--variable that contains a queryl_c sys_refcursor;--cursor variable(weak cursor).l_res your_table%rowtype;--variable containing fetching databeginl_sql :='select * from your_table';--Open the cursor and fetching data explicitly--in the LOOP.openl_cforl_sql; ...
cursor mycursor is select * from cat; begin open mycursor; loop fetch mycursor into v_tablename,v_tabletype; null; --you can use tablename and v_tabletype end loop; close mycursor; end StudyCursor; 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 creat...
This Oracle tutorial explains how to use the CURSOR FOR LOOP in Oracle with syntax and examples. The syntax for the CURSOR FOR Loop in Oracle / PLSQL is:
This article shows the use of Oracle cursors for loops with an appropriate example. The process of opening, fetching, and closing is handled implicitly by a cursors FOR LOOP. If there is a need to FETCH and PROCESS each and every record from a cursor, th
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方便单独维护SQL cursor cursor_all_users is select user_id, username, created from all_users; -- 游标子项(更多的时候,表是动态表,所以这句声明也可以省略) -- cursor_user all_users%rowtype;begin for cursor_user in cursor_all_users loop dbms_output.put_line(cursor_user.username); end loop;...
cursor x is select语句 --(2)定义游标变量 y x%rowtype --(3)使用for循环来使用这个游标 for y in x loop --逻辑处理 end loop; 下面我们通过sql存储过程来完整的实现上面的需求 declare --定义类型 cursor t_tea is select USER_ID from T_TEACHING GROUP BY USER_ID; ...
oracleforloop循 环以及游标循环 1. for in loop形式 DECLARE CURSOR c_sal IS SELECT employee_id, first_name || last_name ename, salary FROM employees ; BEGIN --隐含打开游标 FOR v_sal IN c_sal LOOP --隐含执行一个FETCH语句 DBMS_OUTPUT.PUT_LINE(to_char(v_sal.employee_id)||'---'|| ...
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Oracle for循环语句还可以与游标一起使用，以遍历查询结果集的每一行，并对每一行执行指定的操作。下面是一个使用游标的Oracle for循环程序语句示例：```DECLARE cursor_emp CURSOR IS SELECT employee_id, first_name, last_name FROMemployees;emp_rec employees%ROWTYPE;BEGIN FOR emp_rec IN cursor_emp LOOP D...