OracleDateTime 实现 INullableIComparable 注解 若要获取OracleDateTime对象,请GetOracleDateTime调用 方法。 结构的最小有效日期OracleDateTime为 1/1/0001 00:00:00。 但是,Oracle 支持早在公元前 4712 年 1 月 1 日。 若要绑定 BC 日期,请分别使用String参数和 Oracle TO_DATE或TO_CHAR转换函数作...
date_value:=extract(date_field from [datetime_value|interval_value]) SQL> select extract(month from sysdate) "This Month" from dual; This Month --- 6 SQL> select extract(year from add_months(sysdate,36)) " Years" from dual; Years --- 2008 10。localtimestamp()返回会话中的日期和时间 ...
name, b.* from v$tablespace a, (select tablespace_id, trunc(to_date(rtime, 'mm/dd/yyyy hh24:mi:ss')) datetime, max(tablespace_usedsize * 8 / 1024) used_size from dba_hist_tbspc_space_usage where trunc(to_date(rtime, 'mm/dd/yyyy hh24:mi:ss')) > trunc(sysdate - 30) group...
'或者delete from 表格 t where t.id = '?'不加关键字from或者用和不用别名t都是可以的,不过放在mysql5.X就不可以了,其它Mysql版本没验证过,Mysql版本要求必须加关键字from同时不能加别名delete from 表格 where id = '?' (3) 时间函数 Oracle的时间函数和Mysql的时间函数是不同的,Oracle的格式是to_date...
日期和字符转换函数用法(to_date,to_char) 2. select to_char( to_date(222,''J''),''Jsp'') from dual 显示Two Hundred Twenty-Two 3. 求某天是星期几 select to_char(to_date(''2002-08-26'',''yyyy-mm-dd''),''day'') from dual; 星期一 ...
8。dbtimezone()返回时区 SQL> select dbtimezone from dual;DBTIME --- -08:009。extract()找出日期或间隔值的字段值 date_value:=extract(date_field from [datetime_value|interval_value]) SQL> select extract(month from sysdate) "This Month" from dual;This ...
DATE DateTime DateTime FLOAT (P < 16) Double Double FLOAT (P >= 16) Decimal Double INTERVAL YEAR TO MONTH Int64 String INTERVAL DAY TO SECOND TimeSpan String LONG String String LONG RAW Byte[] Byte[] NCHAR String String NCLOB String String NUMBER (p,s) Int16, Int32, Int64, Double, ...
FROM EMPINFO"; OracleConnection connection = new OracleConnection(constr); OracleCommand cmd = new OracleCommand(cmdstr, con); OracleDataReader reader = cmd.ExecuteReader(); // Declare the variables to retrieve the data in EmpInfo short empNo; string empName; DateTime hireDate; double salary;...
取出数据库字段中DateTime列的日期部分: (1)select Datename(year,GetDate())+'-'+Datename(month,GetDate())+'-'+Datename(day,GetDate()) (2)select convert(varchar(10),getdate(),120) (3)select * from MyDsk_提醒 where ye SQL Server时间截取 ...
(); info.DateFormat = "DD-MON-YYYY BC"; OracleGlobalization.SetThreadInfo(info); // Print the lower and upper boundaries Console.WriteLine("OracleDate ranges from\n{0}\nto\n{1}\n", date1, date2); Console.WriteLine(".NET DateTime ranges from\n{0}\nto\n{1}\n", date3, date4)...