环境：Oracle 10g,11g
问题重现：PL/SQL中命令窗口下，发现存储过程得到的时间格式不符合预期要求。
SQL> select sysdate from dual; SYSDATE
-----------
2014-12-18 Executed in 0 seconds SQL> set serveroutput on
SQL> declare
2 pro_date date;
3 begin
4 select sysdate into pro_date from dual;
5 dbms_output.put_line(pro_date);
6 end;
7 / 18-12月-14 PL/SQL procedure successfully completed Executed in 0.016 seconds
处理方法1：将结果转换成字符串格式：
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;
/ -- 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;
/ -12月- PL/SQL procedure successfully completed Executed in seconds
处理方法2：改变会话的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
2 pro_date date;
3 begin
4 select sysdate into pro_date from dual;
5 dbms_output.put_line(pro_date);
6 end;
7 / 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
2 pro_date date;
3 begin
4 select sysdate into pro_date from dual;
5 dbms_output.put_line(pro_date);
6 end;
7 / 2014-12-18 PL/SQL procedure successfully completed Executed in 0 seconds
总结：在Oracle存储过程想要获取YYYY-MM-DD的时间格式，可以转换成字符串处理，可以临时指定会话的NLS_DATE_FORMAT变量，还可以整体修改客户端的环境变量。