如何在SQL Developer中

Question

问题

我只是想看到一个变量的值选择的变量值。我不明白为什么这会如此困难。

我的SQL语句

--set serveroutput on format wrapped; Tried this too 
SET SERVEROUTPUT ON; 
--DBMS_OUTPUT.ENABLE(32000); Tried with, and without this 

vend_num xx.VENDOR_CWT.VEND_NO%TYPE; 
SELECT vend_no 
INTO vend_num 
FROM xx.VENDOR_NAME 
WHERE VENDOR_NAME1 = 'xxxx'; 

dbms_output.put_line(vend_num); 

我歌厅错误

Error starting at line 13 in command: 
dbms_output.put_line(vend_num) 
Error report: 
Unknown Command 

我已经试过

我已经试过了如下回答：

Print text in Oracle SQL Developer SQL Worksheet window

Printing the value of a variable in SQL Developer

我所做的事，这个答案与GUI建议：https://stackoverflow.com/a/7889380/496680

我试过exec dbms_output[...]一些帖子建议。

问题

如何只打印vend_num的价值;

Answer 1

DBMS_Output是一个PL/SQL包，所以你可以从PL/SQL代码中调用它。

declare 
    end_num xx.VENDOR_CWT.VEND_NO%TYPE; 
begin 
    SELECT vend_no 
    INTO vend_num 
    FROM xx.VENDOR_NAME 
    WHERE VENDOR_NAME1 = 'xxxx'; 
    dbms_output.put_line(vend_num); 
end; 
/