Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

C#´¦Àíoracle lobµÄÀý×Ó

  protected void BindData1()
    {
        OracleConnection orcn = new OracleConnection("User ID=wesoftwcp; Password=wesoft; Data Source=oradb");
        orcn.Open();
        string MyData = "";
        StreamReader rs = new StreamReader(@"c:\1.txt");
        MyData = rs.ReadToEnd();
        rs.Close();
        //OracleConnection orcn = new OracleConnection("User ID=wesoftwcp; Password=wesoft; Data Source=oradb");
        //orcn.Open();
        OracleType lobtype = OracleType.Clob; //Èç¹ûÊÇblobÕâÀï¸Ä³ÉOracleType.blob
        string CreateTempBlob = "DECLARE A " + lobtype + "; " +
            "BEGIN " +
            "DBMS_LOB.CREATETEMPORARY(A, FALSE); " +
            ":LOC := A; " +
            "END;";
        OracleTransaction transaction = orcn.BeginTransaction();
        OracleParameter[] param = new OracleParameter[1];
        param[0] = new OracleParameter("LOC", OracleType.Clob);
        //OracleHelper.CacheParameter(CreateTempBlob,param);
        OracleCommand cmdTemp = new OracleCommand(CreateTempBlob, orcn);
        param[0].Direction = ParameterDirection.Output;
        //OracleHelper.ExecuteNonQuery(transaction


Ïà¹ØÎĵµ£º

oracleµÄÊý¾ÝÀàÐÍ

ÔÚORACLE8Öж¨ÒåÁË£º±êÁ¿(Scalar)¡¢¸´ºÏ(COMPOSITE)¡¢ÒýÓÃ(REFERENCE)ºÍLOBËÄÖÖÊý¾ÝÀàÐÍ¡£
£¨Ò»£©±êÁ¿(Scalar)
    ±êÁ¿ÀàÐÍÓëÊý¾Ý¿âµÄÁÐËùʹÓõÄÀàÐÍÏàͬ£¬´ËÍâËü»¹ÓÐһЩÀ©Õ¹¡£
    ËüÓÖ·ÖΪÆß¸ö×飺Êý×Ö¡¢×Ö·û¡¢ÐС¢ÈÕÆÚ¡¢Ðбêʶ¡¢²¼¶ûºÍ¿ÉÐÅ¡£
¢ÙÊý×Ö
¡¡
    ÓÐÈ ......

ORACLE nulls first or nulls lastÓ﷨ѧϰ

ʹÓÃnulls first »òÕßnulls last Óï·¨
 
Nulls firstºÍnulls lastÊÇOracle Order byÖ§³ÖµÄÓï·¨
Èç¹ûOrder by ÖÐÖ¸¶¨Á˱í´ïʽNulls firstÔò±íʾnullÖµµÄ¼Ç¼½«ÅÅÔÚ×îǰ(²»¹ÜÊÇasc »¹ÊÇ desc)
Èç¹ûOrder by ÖÐÖ¸¶¨Á˱í´ïʽNulls lastÔò±íʾnullÖµµÄ¼Ç¼½«ÅÅÔÚ×îºó (²»¹ÜÊÇasc »¹ÊÇ desc)
ʹÓÃÓï·¨ÈçÏ£º
--½«nulls ......

ORACLEÖеÄÊ±Çø£¨time zone£©

oracle¶ÔÊ±ÇøµÄÖ§³Ö±È½ÏÍêÃÀÁË£¬ÓÐtimestamp with time zoneºÍtimestamp with local time zoneÁ½ÖÖÊý¾ÝÀàÐÍ¡£Ëùνtimestamp with time zone£¬Ò²¾ÍÊǰÑÊ±ÇøÐÅÏ¢±£´æÔÚÁÐÊý¾ÝÖУ¬¶øtimestamp with local time zone£¬»á½«Óû§ÊäÈëµÄʱ¼äת»»ÎªÊý¾Ý¿â·þÎñÆ÷ËùÔÚÊ±ÇøµÄʱ¼ä£¬±£´æÔÚÁÐÖУ¬ÕâÑùÄÜÉÔÉÔ¼õÉÙÒ»µã±£´æµÄÊý¾ÝÁ¿¡£ÒòΪt ......

½«Í¼Æ¬µÈÎļþ±£´æµ½sqliteÖУ¨c#£©

 SqLite.netµÄdllΪSystem.Data.SQLite.dll£¬ÕâÖÖdll·ÖΪ32λ¡¢64λºÍÊÊÓÃÓÚcompactframeworkÈýÖÖ£¬ÔÚÒýÓÃʱҪעÒ⣬ѡÔñÕýÈ·µÄdll¡£
½«Òª±£´æÍ¼Æ¬µÄ×Ö¶ÎÀàÐÍÉèΪblob¡£´úÂëÈçÏ£º
private void savePicture£¨£©
{
using (SQLiteConnection cnn = new SQLiteConnection(dbPath))
......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ