BLOBת»»ÎªCLOBµÄº¯Êý£¨oracleÖÐÖ´ÐУ©
BLOBת»»ÎªCLOBµÄº¯Êý£¨oracleÖÐÖ´ÐУ©
CREATE OR REPLACE FUNCTION BlobToClob(blob_in IN BLOB) RETURN CLOB AS
v_clob CLOB;
v_varchar VARCHAR2(32767);
v_start PLS_INTEGER := 1;
v_buffer PLS_INTEGER := 32767;
BEGIN
DBMS_LOB.CREATETEMPORARY(v_clob, TRUE);
FOR i IN 1 .. CEIL(DBMS_LOB.GETLENGTH(blob_in) / v_buffer) LOOP
v_varchar := UTL_RAW.CAST_TO_VARCHAR2(DBMS_LOB.SUBSTR(blob_in,
v_buffer,
v_start));
DBMS_LOB.WRITEAPPEND(v_clob, LENGTH(v_varchar), v_varchar);
DBMS_OUTPUT.PUT_LINE(v_varchar);
v_start := v_start + v_buffer;
END LOOP;
RETURN v_clob;
END BlobToClob;
Ò»¡¢ BLOBºÍCLOBµÄÇø±ð
1. BLOBʹÓöþ½øÖƱ£´æÊý¾Ý£¬CLOBʹÓÃCHARÀ´±£´æÊý¾Ý¡£
2. CLOB£¬NCLOB£¬BLOB¶¼ÊÇÄÚ²¿µÄLOB(Large Object)ÀàÐÍ£¬×4G£¬Òª±£´æͼƬ¡¢Îı¾Îļþ¡¢WordÎļþ×îºÃʹÓÃBLOBÀàÐÍ¡£
¶þ¡¢ ³£ÓòÙ×÷£º
Get£¨£©·½·¨£º
CLOB£º
//»ñµÃÊý¾Ý¿âÁ¬½Ó
Connection con = ConnectionFactory.getConnection(); &n
Ïà¹ØÎĵµ£º
ÔÚ´óÐ͵ÄÆóÒµÓ¦ÓûòÆóÒµ¼¶µÄÊý¾Ý¿âÓ¦ÓÃÖУ¬Òª´¦ÀíµÄÊý¾ÝÁ¿Í¨³£¿ÉÒÔ´ïµ½¼¸Ê®µ½¼¸°ÙGB£¬ÓеÄÉõÖÁ¿ÉÒÔµ½TB¼¶¡£ËäÈ»´æ´¢½éÖʺÍÊý¾Ý´¦Àí¼¼ÊõµÄ·¢Õ¹Ò²ºÜ¿ì£¬µ«ÊÇÈÔÈ»²»ÄÜÂú×ãÓû§µÄÐèÇó£¬ÎªÁËʹÓû§µÄ´óÁ¿µÄÊý¾ÝÔÚ¶Áд²Ù×÷ºÍ²éѯÖÐËٶȸü¿ì£¬OracleÌṩÁ˶ԱíºÍË÷Òý½øÐзÖÇøµÄ¼¼Êõ£¬ÒÔ¸ÄÉÆ´óÐÍÓ¦ÓÃϵͳµÄÐÔÄÜ¡£
ʹÓ÷ÖÇøµÄÓŵ㣠......
ºÜ¶àÈ˶¼Åöµ½¹ýÒòΪ×Ö·û¼¯²»Í¬¶øʹÊý¾Ýµ¼Èëʧ°ÜµÄÇé¿ö¡£ÕâÉæ¼°Èý·½ÃæµÄ×Ö·û¼¯£¬Ò»ÊÇoracel server¶ËµÄ×Ö·û¼¯£¬¶þÊÇoracle client¶ËµÄ×Ö·û¼¯;ÈýÊÇdmpÎļþµÄ×Ö·û¼¯¡£ÔÚ×öÊý¾Ýµ¼ÈëµÄʱºò£¬ÐèÒªÕâÈý¸ö×Ö·û¼¯¶¼Ò»Ö²ÅÄÜÕýÈ·µ¼Èë¡£
¡¡¡¡1¡¢²éѯoracle server¶ËµÄ×Ö·û¼¯
¡¡¡¡ÓкܶàÖÖ·½·¨¿ÉÒÔ²é³öor ......
Ò» Oracle¹«Ë¾¼ò½é
OracleÊÇÒóÐæ³öÍÁµÄ¼×¹ÇÎÄ(oracle bone inscriptions)µÄÓ¢ÎÄ·ÒëµÄµÚÒ»¸öµ¥´Ê
Oracle¹«Ë¾ÊÇÈ«Çò×î´óµÄÐÅÏ¢¹ÜÀíÈí¼þ¼°·þÎñ¹©Ó¦ÉÌ£¬³ÉÁ¢ÓÚ1977Ä꣬×ܲ¿Î»ÓÚÃÀ¹ú¼ÓÖÝ Redwood shore
Oracle¹«Ë¾ÒòÆ临ÔӵĹØϵÊý¾Ý¿â²úÆ·¶øÎÅÃû¡£OracleµÄ¹ØϵÊý¾Ý¿âÊÇÊÀ½çµÚÒ»¸öÖ§³ÖSQLÓïÑÔµÄÊý¾Ý¿â
OracleÔÚ³¬¹ý ......
Ò»¡¢java·ÃÎÊÖÐÎÄOracleÊý¾Ý¿âÉÏÁ¬½ÓµÄUS7ASCIIÊý¾Ý¿â
1¡¢¶Á·½·¨
public String convertLink_DB(String s) {
if(s != null){
try{
byte[] b = s.getBytes();
for(int i=0; i<b.length; i++){
b[i] ......
1.¾ø¶ÔÖµ
S:select abs(-1) value
O:select abs(-1) value from dual
2.È¡Õû(´ó)
S:select ceiling(-1.001) value
O:select ceil(-1.001) value from dual
3.È¡Õû£¨Ð¡£©
S:select floor(-1.001) value
O:select floor(-1.001) value from dual
4.È ......