Oracle預存程序擷取YYYY-MM-DD的時間格式

Oracle預存程序擷取YYYY-MM-DD的時間格式

環境：Oracle 10g,11g

問題重現：PL/SQL中命令視窗下，發現預存程序得到的時間格式不符合預期要求。

SQL> select sysdate from dual;

SYSDATE
-----------
2014-12-18

Executed in 0 seconds

SQL> set serveroutput on
SQL> declare
pro_date date;
begin
select sysdate into pro_date from dual;
dbms_output.put_line(pro_date);
end;
/

18-12月-14

PL/SQL procedure successfully completed

Executed in 0.016 seconds

處理方法1：將結果轉換成字串格式：

SQL>
SQL> declare
pro_date date;
begin
select sysdate into pro_date from dual;
dbms_output.put_line(to_char(pro_date,'yyyy-mm-dd'));
end;
/

2014-12-18

PL/SQL procedure successfully completed

Executed in 0.016 seconds

SQL>
SQL> declare
pro_date date;
begin
select sysdate into pro_date from dual;
dbms_output.put_line(pro_date);
end;
/

18-12月-14

PL/SQL procedure successfully completed

Executed in 0 seconds

處理方法2：改變會話的NLS_DATE_FORMAT

SQL> alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';

Session altered

Executed in 0.015 seconds

SQL>
SQL> declare
pro_date date;
begin
select sysdate into pro_date from dual;
dbms_output.put_line(pro_date);
end;
/

2014-12-18 11:18:15

PL/SQL procedure successfully completed

Executed in 0 seconds

SQL> alter session set nls_date_format='yyyy-mm-dd';

Session altered

Executed in 0 seconds

SQL>
SQL> declare
pro_date date;
begin
select sysdate into pro_date from dual;
dbms_output.put_line(pro_date);
end;
/

2014-12-18

PL/SQL procedure successfully completed

Executed in 0 seconds

總結：在Oracle預存程序想要擷取YYYY-MM-DD的時間格式，可以轉換成字串處理，可以臨時指定會話的NLS_DATE_FORMAT變數，還可以整體修改用戶端的環境變數。