C# ¶ÁÈ¡ºÍдÈëoracleµÄblob×ֶεķ½·¨
//ÏòÊý¾Ý¿âÖÐдÈë
private void button1_Click(object sender, EventArgs e)
{
oracleConnection1.Open();
OracleCommand cmd = new OracleCommand("UPDATE TEST SET F2 =:blob where F1=:sn ", oracleConnection1);
cmd.Parameters.Add(new OracleParameter("blob",OracleType.Blob));
cmd.Parameters.Add(new OracleParameter("sn",OracleType.Int32));
FileInfo fi = new FileInfo("c:\\dos.doc");
FileStream fs = fi.OpenRead();
byte[] MyData = new byte[fs.Length];
fs.Read(MyData, 0, System.Convert.ToInt32(fs.Length));
fs.Close();
cmd.Parameters["blob"].Value = MyData;
cmd.Parameters["sn"].Value = 1;
try
{
int result = cmd.ExecuteNonQuery();
if (result < 1)
 
Ïà¹ØÎĵµ£º
1.oralceɾ³ýÃüÁî
1.1.ɾ³ýÓû§
drop user username cascade;
1.2.ɾ³ý±í¿Õ¼ä
DROP TABLESPACE dataspace INCLUDING CONTENTS AND DATAFILES;
2.´´½¨±í¿Õ¼ä
2.1.½¨Á¢±í¿Õ¼ä
CREATE TABLESPACE dataspace
DATAFILE '/Ŀ¼/dataspace.dbf' SIZE 500M
UNIFORM SIZE 128k; //Ö¸¶¨Çø³ß´çΪ128k,Èç²»Ö¸¶¨£¬Çø³ß´çĬÈÏÎ ......
C Sharp(C#)ÖÐÈçºÎɾ³ýÎļþ(Îļþ¼Ð)
Ö±½Óɾ³ý:
using System.IO;
...
string filePath = @"D:\...\xxx.xxx";
if (File.Exists(filePath))
{
File.Delete(filePath);
}
else
{
Console. ......
oracleµÄnvlº¯ÊýµÄÓ÷¨ ͨ¹ý²éѯ»ñµÃij¸ö×ֶεĺϼÆÖµ£¬Èç¹ûÕâ¸öֵλnull½«¸ø³öÒ»¸öÔ¤ÉèµÄĬÈÏÖµ
select nvl(sum(t.dwxhl),1) from tb_jhde t where zydm=-1ÕâÀï¹ØÐĵÄnvlµÄÓ÷¨£¬nvl£¨arg,value£©´ú±íÈç¹ûÇ°ÃæµÄargµÄֵΪnullÄÇô·µ»ØµÄֵΪºóÃæµÄvalue
Èç: NVL(a,b)¾ÍÊÇÅжÏaÊÇ·ñÊÇNULL,Èç¹û²»ÊÇ·µ»ØaµÄÖµ£¬Èç¹ ......
ORACLE ʱ¼ä×Ö¶ÎÅÅÐòÎÊÌâ
ÔçÉÏÔÚŪEXTÅÅÐòµÄʱºò£¬ÒòΪÊý¾Ý¿âIDÊÇSTRINGµÄ£¬Òò´ËÔÚcommandÀàÀï¶àÁËÒ»¸öinteger idSort×ֶΣ¬
ûÏëµ½£¬¸ù¾ÝÕâ¸öÕûÐ͵Ä×ֶνøÐÐÅÅÐòÒ²²»ÐУ¬ÒòΪEXT·ÖÒ³³öÀ´µÄËäÈ»ÊǸù¾ÝÕâ¸öÕûÐÍ×Ö¶ÎÅÅÐòÁË¡£µ«ÊÇ
¸÷¸öÒ³ÃæÃ»ÓÐÍêÈ«µÄͳһÅÅÐò¡£
Òò´Ë£¬ÔÚDAOÀïдÁËÈçÏÂHQLÓï¾ä£º
select tbl from Tr ......
Ô´ÌùµØÖ·:http://topic.csdn.net/u/20090520/15/08a03d2e-a537-4c06-b79a-7e2f7ed5f898.html
1,
ASCII
·µ»ØÓëÖ¸¶¨µÄ×Ö·û¶ÔÓ¦µÄÊ®½øÖÆÊý;
SQL> select ascii(A) A,ascii(a) a,ascii(0) zero,ascii( ) space from dual;
A A ZERO SPACE
--------- --------- --------- ---------
65 97 48 32
2. CHR
......