游标示例

SET SERVEROUTPUT  ON

DECLARE   —-声明变量和游标

v_product_id        products.product_id%TYPE;
v_name            products.name%TYPE;
v_price            products.price%TYPE;

CURSOR v_product_cursor  IS    
    select product_id, name, price
        from products
            order by product_id ;

BEGIN
        —-打开游标
    OPEN v_product_cursor;

LOOP
        —-获取游标的列
    FETCH    v_product_cursor 
        INTO  v_product_id, v_name, v_price ;

    EXIT WHEN v_product_cursor%NOTFOUND ;

    —-显示到屏幕上
    DBMS_OUTPUT.PUT_LINUE(

    ’v_product_id=‘|| v_product||‘, v_name=‘||v_name||‘, v_price=‘||v_price

    );

END LOOP;


CLOSE v_product_cursor ;

END;
/

====================================================================================

set serveroutput on

declare    —-声明变量和游标
    
    v_product_id        products.product_id%type;
    v_name            products.name%type;
    v_price            products.price%type;

    cursor        v_product_cursor is
        select product_id, name, price
            from products
                order by product_id ;


begin
            —-for循环输出到屏幕上
    for v_product_cursor loop

        dbms_output.put_line(

    ‘v_product_id=‘|| v_product_id||’,v_name=‘||v_name||’,v_price=‘||v_price        

        );
    end loop;

end;
/