今天有一开发兄弟找我。说出现一奇怪现象，在存储过程中赋date类型的值，时、分、秒都丢失了，以下来做个试验：
SQL> drop table test purge;
SQL> create table test
(
fill_date date
);
SQL> insert into test values(sysdate);
SQL> commit;
SQL> select to_char(fill_date,'yyyy-MM-dd HH24:mi:ss') from test;
TO_CHAR(FILL_DATE,'
-------------------
2014-07-18 17:47:22
SQL> CREATE OR REPLACE PROCEDURE test_p
is
s_sql varchar2(500);
s_date date;
begin
s_date:= to_date('2014-07-18 17:24:32','yyyy-MM-dd HH24:mi:ss');
s_sql := 'UPDATE test SET fill_date = '''||s_date ||'''';
execute immediate s_sql;
commit;
end;
/
SQL> call test_p();
SQL> select to_char(fill_date,'yyyy-MM-dd HH24:mi:ss') from test;
TO_CHAR(FILL_DATE,'
-------------------
2014-07-18 00:00:00 --能够看到确实时、分、秒已经丢失，怀疑是隐式转换导致
--调整下存储过程。看打印出什么来。
SQL> CREATE OR REPLACE PROCEDURE test_p
is
s_sql varchar2(500);
s_date date;
begin
s_date:= to_date('2014-07-18 17:24:32','yyyy-MM-dd HH24:mi:ss');
s_sql := 'UPDATE test SET fill_date = '''||s_date ||'''';
dbms_output.put_line(s_sql);
execute immediate s_sql;
commit;
end;
/
SQL> set serveroutput on
SQL> call test_p();
UPDATE test SET fill_date = '18-7月 -14'
调用完毕。
--确认发生了隐式转换，那就使用绑定变量了
SQL> CREATE OR REPLACE PROCEDURE test_p
is
s_sql varchar2(500);
s_date date;
begin
s_date:= to_date('2014-07-18 17:24:32','yyyy-MM-dd HH24:mi:ss');
s_sql := 'UPDATE test SET fill_date = :1';
execute immediate s_sql using s_date;
commit;
end;
/
SQL> call test_p();
调用完毕。
SQL> select to_char(fill_date,'yyyy-MM-dd HH24:mi:ss') from test;
TO_CHAR(FILL_DATE,'
-------------------
2014-07-18 17:24:32