1createorreplaceprocedureno_copy_proc (2p_inparaminnumber,3p_outparam out nocopyvarchar2,4p_inoutparaminout nocopyvarchar25)as6begin7null;8end; 在IN参数上使用NOCOPY时,会引发一个编译错误,因为IN参数总是以传引用方式传递参数的,因此不允许使用编译器提示NOCOPY。 2、带NOCOPY的异常语义 使用NOCOPY即...
NOCOPY模式用于限定OUT模式在调用时是不是以传引用的方式进行(它只是一个编译器暗示,不一定总是起作用),默认情况下,OUT模式的参数是以传值的方式进行调用的. IN主要用于传入参数的,虽然n2 := 20被调用,但是要到返回的时候才生效.如<<1>>所示. NOCOPY是传引用,会在赋值的时候立即生效,如<<2>>所示,如果在...
Oracle⼦程序参数模式,IN,OUT,NOCOPY IN主要⽤于传⼊参数,可以是变量,常量,表达式,在⼦程序内部不能改变其值.复制代码代码如下:DECLARE n NUMBER := 10;PROCEDURE do_something (n1 IN NUMBER) IS BEGIN dbms_output.put_line(n1); -- prints 10 --n1:=20; --illegal assignment.END;BEGIN do_...
将NOCOPY应用在传递数据量很大的参数(such as collections, records, and instances of object types)时,可起到优化性能的作用。 当参数是OUT或者IN OUT类型时:没有NOCOPY=按值传递(ByVal);加上NOCOPY=按引用传递(ByRef)。 Test Code: DECLARE l_1 NUMBER := 10; l_2 NUMBER := 20; l_3 NUMBER := ...
DECLARE l_1 NUMBER := 10; l_2 NUMBER := 20; l_3 NUMBER := 30; PROCEDURE test_out ( p1 IN NUMBER ,x1 IN OUT NUMBER ,x2 IN OUT NOCOPY NUMBER ) IS BEGIN x1 := p1; dbms_output.put_line('inside test_out, x1=' || x1); x2 := p1; dbms_output.put_line('inside test_ou...
DECLARE l_1 NUMBER := 10; l_2 NUMBER := 20; l_3 NUMBER := 30; PROCEDURE test_out ( p1 IN NUMBER ,x1 IN OUT NUMBER ,x2 IN OUT NOCOPY NUMBER ) IS BEGIN x1 := p1; dbms_output.put_line('inside test_out, x1=' || x1); x2 := p1; dbms_output.put_line('inside test_ou...
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Connected. IN OUT Time : 126 hsecs PL/SQL procedure successfully completed. Connected. IN OUT NOCOPY Time : 0 hsecs PL/SQL procedure successfully completed. Connected. IN OUT Memory : 99549184 bytes PL/SQL procedure successfully completed. Connected. IN OUT NOCOPY Memory: 0 bytes PL/SQL pro...
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