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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)
    


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oracle½¨Á¢±í¿Õ¼ä

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)

C Sharp(C#)ÖÐÈçºÎɾ³ýÎļþ(Îļþ¼Ð)
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using System.IO;
...
string filePath = @"D:\...\xxx.xxx";

if (File.Exists(filePath))
{
File.Delete(filePath);
}
else
{
Console. ......

oracleµÄnvlº¯ÊýµÄÓ÷¨

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

 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¡£
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select tbl from Tr ......

Oracle ³£Óú¯Êý×ܽá

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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 ......
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