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In Reply to: ÀÚ¹Ù¿¡¼­ DB¸¦ ACCESSÇÏ´Â ¹æ¹ýµé¿¡ ´ëÇÑ ¹®ÀÇ.. posted by Çã½ÂÇÊ on 1998³â 9¿ù 30ÀÏ 17:10:04:

¿ë¾îÀÇ È¥¿ëÀÌ Á» ÀÖ´Â µí ÇÕ´Ï´Ù.
´äº¯Çϱâ Àü¿¡ ¸ÕÀú ¿ë¾î Á¤¸®ºÎÅÍ ÇÏ°Ú½À´Ï´Ù.


<¿ë¾îÁ¤¸®>
1. Java Applet: Java language·Î Â¥¿©Á® ÀÖ°í Web Server¿¡ byte compileµÇ¾î
.classÆÄÀϵé ȤÀº À̵éÀ» jar·Î ¹­¾î ÇϳªÀÇ .jarÆÄÀÏ·Î ³õ¿© ÀÖÀ¸¸ç
netscape³ª IE, ȤÀº HotJava¿Í °°Àº Web Browser¿¡¼­ html³»¿¡
Enbedded applet tag¿¡ ÀÇÇØ ½ÇÇà¿äû½Ã DownloadingµÇ¾î Client Web Browser
³»ÀÇ Java Virtual machine¿¡ ÀÇÇØ ½ÇÇàµÇ´Â ÀÚ¹Ù ÇÁ·Î±×·¥.


2. Java Application: ¿ª½Ã Java language·Î Â¥¿©Á® ÀÖÀ¸¸ç C³ª C++·Î Â¥¿©Áø
°Í°ú °°ÀÌ µ¶´ÜÀûÀ¸·Î ½ÇÇà°¡´ÉÇÑ ÇÁ·Î±×·¥. Background consoleÇüÅÂÀÇ
ÇÁ·Î±×·¥À̳ª, Visual C++·Î °³¹ßµÈ ÇÁ·Î±×·¥°ú °°ÀÌ GUI¸¦ Æ÷ÇÔÇÏ´Â
ÇÁ·Î±×·¥À¸·Îµµ ±¸ÇöÇÒ ¼ö ÀÖÀ½.
JRE(Java Runtime Environment)³ª JDK³»ÀÇ JVM¿¡ ÀÇÇØ java XXXX ¿Í °°Àº
ÇüÅ·Π½ÇÇà


3. JDBC Driver: Sun¿¡¼­ ³»¾î ³õÀº Ç¥ÁØ DB Access API.
JDBC(Java DataBase Commectivity) Driver Manager´Â JDBC API¶ó´Â ¸íĪ
À¸·Î JDK³»¿¡ ±âº»À¸·Î µé¾î ÀÖÀ¸¸ç ÀÌ·¯ÇÑ Driver Manager¸¦ ÅëÇØ
½ÇÁúÀûÀ¸·Î DB¿¡ AccessÇϱâ À§Çؼ­´Â sunÀÇ spec.¿¡ µû¶ó °¢ DB VenderµéÀÌ
¸¸µç °¢°¢ÀÇ JDBC Driver¸¦ ÀÌ¿ëÇØ¾ß ÇÕ´Ï´Ù. ÀÌ´Â °¢ DB VenderµéÀÇ home
page¿¡¼­ download¹ÞÀ» ¼ö ÀÖ½À´Ï´Ù.
Sun¿¡¼­ Á¦°øÇÏ´Â JDK³»¿¡´Â java.sql.* package°¡ ±âº»À¸·Î µé¾î Àִµ¥
¿©±â¿¡ JDBC Driver Manager°¡ µé¾î ÀÖ½À´Ï´Ù.
µû¶ó¼­ Java·Î DB Access¸¦ ÇϱâÀ§Çؼ­´Â JDK³»ÀÇ JDBC Driver Manager¿Í
°¢ DB VenderµéÀÌ Á¦°øÇÏ´Â º°µµÀÇ JDBC Driver°¡ ÀÖ¾î¾ß ÇÏ´Â °ÅÁö¿ä.


4. JDBC DriverÀÇ ³×°¡Áö Á¾·ù
Sun¿¡¼­´Â °¢ Venderµé¿¡°Ô 4°¡Áö Á¾·ùÀÇ JDBC Driver°¡ ÀÖÀ½À» °øÇ¥ Çß½À´Ï´Ù.
±× Áß¿¡¼­µµ 2¹ø°¿Í 4¹ø° typeÀÌ °¢ VenderµéÀÌ ¸¹À̵é Á¦°øÇϴµ¥,
2¹ø° typeÀ̶õ, Sql*NetÀ» ÇÊ¿ä·Î Çϸç, .dllȤÀº .soÇüÅÂÀÇ H/W Á¾¼ÓÀûÀÎ
ÇüÅ·ΠDB¿Í ¿¬°áµË´Ï´Ù. ÀÌ´Â Java Applet¿¡¼­´Â »ç¿ëÇÒ ¼ö ¾ø´Â ÇüÅÂÀ̸ç
Java ApplicationÀ¸·Î ±¸ÇöÇÒ ¶§ ¼ÓµµÇâ»óÀÌ ´Ù¼Ò µÎµå·¯ Áý´Ï´Ù.
3-tier·Î ±¸Çö½Ã¿¡ Server-tier¿¡¼­ DB¿Í ¿¬°áÇÒ ¶§ ÀûÀýÈ÷ »ç¿ëÇÒ ¼ö ÀÖÀ¸¸ç
Oracle°°Àº °æ¿ì windows95/NT¿Í Solaris Version ¸¸ Áö±Ý ³ª¿Í ÀÖ½À´Ï´Ù.
ÀÌ 2¹ø TypeÀ» Åë»ó OCI Driver°¡ ºÎ¸¨´Ï´Ù.


4¹ø° typeÀ̶õ, ¼ø¼öÇÏ°Ô Java language¿¡¼­ ¹Ù·Î DB¿Í ¿¬°áÀÌ °¡´ÉÇÕ´Ï´Ù.
Java Application»Ó¸¸ ¾Æ´Ï¶ó Java Applet¿¡¼­ Remote DB·Î Direct·Î ¿¬°á °¡´Â
ÇÕ´Ï´Ù. ÀÌ 4¹ø TypeÀ» Åë»ó thin Driver°¡ ºÎ¸¨´Ï´Ù.



<Áú¹®»çÇ״亯>
1. »ç¿ëÀÚ PCȤÀº REMOTE ¼­¹ö¿¡ Á¸ÀçÇÏ´Â APPLICATIONÀÌ PC±Þ DB¿Í
REMOTE¼­¹ö DB¸¦ °øÀ¯ÇÒ ¼ö ÀÖ´ÂÁö?


- DB°¡ Remote¿¡ ÀÖµç ³» Local°¡ ÀÖµç, ȤÀº DB°¡ oracleÀ̵ç informixÀÌµç »ó°üÄ¡
¾Ê°í Applicaiton Programer°¡ µ¿ÀÏÇÑ API·Î Access°¡ °¡´ÉÇϵµ·Ï ÇÏ´Â °ÍÀÌ
JDBCÀÇ ±âº»ÀûÀÎ »ç»óÀÔ´Ï´Ù.
´ÙÀ½Àº Java Application(Not Applet!)¿¡¼­ DB¿¡ AccessÇÏ´Â °£´ÜÇÑ ÇÁ·Î±×·¥ÀÔ´Ï´Ù.
---------------------------------------------------------------------------------
import java.sql.*;
class Employee
{
public static void main (String args [])
throws SQLException, ClassNotFoundException
{
DriverManager.registerDriver( new oracle.jdbc.driver.OracleDriver() );
Connection conn =
DriverManager.getConnection ("jdbc:oracle:thin:@165.244.227.233:1521:ORA73",
"scott", "tiger");
Statement stmt = conn.createStatement ();
ResultSet rset = stmt.executeQuery ("select ENAME from EMP");
while (rset.next ())
System.out.println (rset.getString (1));
}
}
---------------------------------------------------------------------------------
À§¿¡¼­ º¸µí DB°¡ OracleÀ̸é
DriverManager.registerDriver( new oracle.jdbc.driver.OracleDriver() );¸¦
»ç¿ëÇÏ¸é µÇ°í, Driver typeÀÌ 4¹ø° TypeÀÎ thin DriverÀ̸é
DriverManager.getConnection ("jdbc:oracle:thin:@165.244.227.233:1521:ORA73",
"scott", "tiger");
¶ó´Â ¹®ÀåÀ» »ç¿ëÇÕ´Ï´Ù. thin, IP Address, port#, SID, id, passwd¸¦ ±â¼úÇÏ´Â °ÅÁÒ.
Áï, DB°¡ Remote À̵ç PCÀÇ Personal Oracle DBÀ̵ç ÀüÇô °³ÀÇÄ¡ ¾Ê½À´Ï´Ù.
¼­·Î´Ù¸¥ µÎ DB¿¡ °¢°¢ÀÇ ConnectionÀ» ¸Î¾î ³õ°í µÎ DB°£¿¡ DataÀÔ·ÂÁ¶È¸¸¦ µ¿½Ã¿¡ ÇÒ
¼ö ÀÖ½À´Ï´Ù.
(±×·¯³ª 2 phase commitÀ» »ç¿ëÇÏ·Á¸é Java Transation API¶ó´Â º°µµÀÇ Package¸¦
»ç¿ëÇØ¾ß ÇÕ´Ï´Ù.)


2. PC±Þ DB¿Í REMOTE¼­¹ö DB¸¦ ACCESSÇÒ¶§, DBȯ°æ¼³Á¤ ȤÀº ÇÁ·Î±×·¥
ÄÚµù»óÀÇ Â÷ÀÌ´Â?

- 1¹ø ´äº¯ ¿¹Á¦¿¡¼­ RemoteÀ̵ç LocalÀ̵ç
DriverManager.registerDriver( new oracle.jdbc.driver.OracleDriver() );
Connection conn =
DriverManager.getConnection ("jdbc:oracle:thin:@165.244.227.233:1521:ORA73",
"scott", "tiger");
ÀÌ°÷ÀÇ ¼³Á¤¸¸ ¹Ù²Ù¸é ¾î´À °÷¿¡ À§Ä¡ÇÏµç ¿¬°áÀÌ °¡´ÉÇÕ´Ï´Ù.
´Ü, À§¿¡¼­´Â JDBC Driver°¡ thin dirverÀÌ´Ï±î °¡´ÉÇÏÁö¸¸, ¸¸¾à OCI Driver¸¦ »ç¿ëÇÑ
´Ù¸é, LocalÀÇ Sql*Net¿¡¼­ ¿ø°ÝÁö DBÀÇ Alias¸¦ ¹Ì¸® ¼³Á¤ ÇØ µÎ¾î¾ß ÇÏ°í,
JDBC OCI Driver´Â LocalÀÇ Remote DB Alias¸¦ ¼³Á¤ÇÕ´Ï´Ù.
¿¹¸¦ µé¸é ´ÙÀ½°ú °°Àº code·Î ±¸ÇöµË´Ï´Ù.
---------------------------------------------------------------------------------
DriverManager.registerDriver( new oracle.jdbc.driver.OracleDriver() );
Connection conn =
DriverManager.getConnection ("jdbc:oracle:oci8:@ORA73", "scott", "tiger");
---------------------------------------------------------------------------------
¿©±â¼­ jdbc:oracle:oci8:@ORA73Àº ¿ø°ÝÁö DB¿¡ ´ëÇÑ Local Sql*Net¿¡¼­ ¼³Á¤ÇÑ
Alias³»¿ëÀÔ´Ï´Ù. Oracle°°Àº °æ¿ì tnsnames.ora ÆÄÀÏ¿¡ ¼³Á¤ÇÏÀݽÀ´Ï±î?


3. JAVA APPLICATION¿¡¼­ ¼­¹ö¿¡ ÀÖ´Â PRO*CµîÀÇ UNIX CÇÁ·Î±×·¥À» È£Ãâ
°¡´ÉÇÑÁö?


- "JAVA APPLICATION"À̶õ ´Ü¾î¸¦ java Applet¿¡ ¹ÝÇÏ´Â µ¶¸³ÀûÀÎ Java ApplcationÀ¸·Î
»ç¿ëÇϼ̴ÂÁö, ¾Æ´Ï¸é Java Language·Î ±¸ÇöµÈ ÀϹÝÀûÀÎ Java programÀ» ÀǹÌÇÏ´Â °ÍÀÎ
Áö ¸íȮġ ¾ÊÁö¸¸,


1)Java Language¿¡¼­ ÀϹÝÀûÀÎ ´Ù¸¥ language·Î ±¸ÇöµÈ program À»
(¸¶Ä¡ C ¿¡¼­ system("ls -alF") ó·³)È£ÃâÇÏ´Â ¹æ¹ýÀº ¾ø½À´Ï´Ù. (Ȥ ÀÖ½À´Ï±î?)
±×·¯³ª JNI(Java Native Interface)¸¦ ÀÌ¿ëÇØ Java Language¿¡¼­ CÀÇ functionÀ»
prameter¸¦ ³Ñ°Ü È£ÃâÇÏ¿© return°ªÀ» ¹ÞÀ» ¼ö´Â ÀÖ½À´Ï´Ù.

2)Java Applet¿¡¼­ ¿ø°ÝÁö machineÀÇ Unix*CÇÁ·Î±×·¥À» ¹Ù·Î CallÇÏ´Â ¹æ¹ýÀº ¾ø½À´Ï´Ù.
±×·¯³ª Socket¼­¹ö¸¦ C·Î ±¸ÇöÇÏ°í, Socket Client¸¦ Java·Î ±¸ÇöÇÏ¸é ¾ç tier´Â
Socket Level¿¡¼­ ¼­·Î ±³½ÅÀÌ °¡´ÉÇÕ´Ï´Ù.
¶Ç Applet¿¡¼­ ¿ø°ÝÁöÀÇ Java·Î ±¸ÇöµÈ Middle-tier Server°¡ ¹Þ°í, ÀÌ middle-tier
¼­¹ö°¡ JNI¸¦ ÀÌ¿ëÇÏ¿© C·Î ±¸ÇöµÈ functionÀ» È£ÃâÇÏ´Â ¹æ¹ýµµ ÀÖ½À´Ï´Ù.
(±×·¯³ª Ưº°ÇÑ °æ¿ì°¡ ¾Æ´Ñ °æ¿ì ÀÌ·¯ÇÑ Architecture´Â ±ÇÇÏÁö ¾Ê°í ½Í½À´Ï´Ù.)

4. »ç¿ëÀÚ°¡ WEB ºê¶ó¿ìÁ®¸¦ ÅëÇÏ¿© REMOTE¼­¹ö¿¡ ÀÖ´Â JAVA APPLICATION
À» ACCESSÇÒ¶§, ¸Å¹ø JAVA APPLICATIONÀ» LOADINGÇÏÁö ¾Ê°í, PC¿¡
´Ù¿î·Îµå ¹Þ¾Æ¼­ °è¼Ó PC APPLICATIONÀ¸·Î »ç¿ëÇÒ ¼ö ÀÖ´ÂÁö?
»ç¿ëÇÒ ¼ö ÀÖ´Ù¸é, REMOTE¼­¹öÀÇ APPLICATIONÀÌ º¯°æµÇ¾úÀ»¶§´Â ÀÚµ¿À¸·Î
PCÀÇ JAVA APPLICATIONÀ» UPDATEÇÒ ¼ö ÀÖ´ÂÁö?

- ¾Æ¸¶ À§¿¡¼­´Â Java Applet¸¦ ¾ê±â ÇϽŠ°Í °°½À´Ï´Ù.
±âº»ÀûÀ¸·Î SunÀº À§¿Í °°Àº ¹æ¹ýÀ» Á¦°øÇÏÁö ¾Ê½À´Ï´Ù. ¸¹Àº ºÐµéÀÌ À§¿Í °ü·ÃµÈ
Software ºÐ¹èÀÇ ¹®Á¦¿¡ °í½ÉÇÏ°í °è½Ã¸ç, ƯÈ÷³ª Applet°°Àº °æ¿ì ¸Å¹ø Downloading
µÇ´Â ½Ã°£ÀÌ ³Ê¹« ´À¸®´Ù°í »ý°¢ÇÏ½Ã°í °è½Ê´Ï´Ù.


ÀÌ°Í¿¡ ´ëÇÑ ÇØ°áÃ¥Àº Push±â¼úÀÇ ¼±µÎ¿¡ ÀÖ´Â Marimba¸¦ ÀÌ¿ëÇÏ¸é µË´Ï´Ù.
Applet¸¦ ¸Å¹ø Downloading¹ÞÁö ¾Ê°í ÀÚ½ÅÀÇ Local PCÀÇ Æ¯Á¤ ¿µ¿ª¿¡ ÀÏ´Ü Çѹø
DownloadµÇ¸é ÀúÀå ½ÃÄÑ µÎ¸ç ´Ù½Ã ½ÇÇà½Ã ¿ø°ÝÁö¿¡¼­ °¡Á® ¿ÀÁö ¾Ê°í, Local¿¡
ÀúÀåµÇ¾î ÀÖ´Â ³à¼®À» °¡µ¿ ½Ãŵ´Ï´Ù. ¹°·Ð ¿ø°ÝÁöÀÇ AppletÀÌ updateµÆ´Ù°Å³ª
¼öÁ¤ÀÌ µÆÀ¸¸é ±× ¶§ ´Ù½Ã °¡Á®¿À¸ç, ÀÌ·¯ÇÑ ÀÛ¾÷Àº Background·Î ÀÛ¾÷ÀÌ ÀϾ´Ï´Ù.
»ç¿ëÀÚ´Â ¸¶Ä¡ ¹ÙÅÁÈ­¸é¿¡ IconÀ¸·Î ¿¬°áÇÏ¿© µÎ¾î ÀϹÝÀûÀÎ Windows ProgramÀ»
½ÇÇàÇϵíÀÌ ½ÇÇà ÇÒ ¼ö ÀÖ½À´Ï´Ù.
Java Applet»Ó¸¸ ¾Æ´Ï¶ó java Application, ½ÉÁö¾î C programµµ À§¿Í °°Àº ¹æ½ÄÀ¸·Î
¿î¿µµÉ ¼ö ÀÖ½À´Ï´Ù.
Å×½ºÆ® Çغ» °á°ú, ÃæºÐÈ÷ È¿¿ë¼ºÀÌ ÀÖÀ¸¸ç, ÇöÀç·Î¼­´Â ModemÀ̳ª, Line ¼Óµµ°¡
¹®Á¦½Ã µÇ´Â °æ¿ì ÀûÀýÇÑ SolutionÀ¸·Î ÆǴܵ˴ϴÙ.
º¸´Ù ÀÚ¼¼ÇÑ °ÍÀº www.marimba.com·Î ¿¬°áÇϼ¼¿ä.
±×¸®°í, CastanetÀ» °øÂ¥·Î Download¹ÞÀ¸¼Å¼­ marimba»çÀÇ AppletÀ̳ª,
Á¦°¡ ¿î¿µÇÏ°í ÀÖ´Â 165.244.227.233:8500¹øÀ¸·Î castanetÀ¸·Î ¿¬°áÇØ º¸½Ã¸é
Sample AppletµéÀ» º¼ ¼ö ÀÖÀ» °Ì´Ï´Ù. (LG-Net¸Á¿¡¼­¸¸)


5. °¡´ÉÇÏ´Ù¸é, JAVA APPLICATIONÀ» »ç¿ëÀÚ PC¿Í REMOTE¼­¹ö¿¡ µ¿½Ã¿¡ º¸°ü
ÇÏ°í, DB¶ÇÇÑ »ç¿ëÀÚ PC¿Í REMOTE¼­¹ö¿¡ µ¿½Ã¿¡ º¸°üÇÏ¿©, ÇÊ¿ä¿¡ µû¶ó
¾î´À ¹æ¹ýÀÌµç ¾²°í ½ÍÀºµ¥ ÀÌ°ÍÀÌ °¡´ÉÇÑ°¡¿ä?


- °¡´ÉÇÕ´Ï´Ù. Java AppletÀ¸·Îµµ ±¸µ¿µÇ¸é¼­, Java ApplicationÀ¸·Îµµ ±¸µ¿µÉ ¼ö ÀÖµµ·Ï
java programÀ» ±¸ÇöÇØ¾ß ÇÕ´Ï´Ù. (±¸ÇöÀº °£´ÜÇÕ´Ï´Ù.) µû¶ó¼­ °°Àº Java programÀ»
Web Browser¸¦ ÅëÇØ AppletÀ¸·Î Á¦°øÇϸ鼭 µ¿½Ã¿¡ ÇØ´ç ProgramÀ» Local PC¿¡
°®´Ù ³õ°í, ÀÏ¹Ý Windows Programó·³ »ç¿ëÇÒ ¼öµµ ÀÖ½À´Ï´Ù. GUI³ª ³»ºÎ code´Â ¿ÏÀüÈ÷
µ¿ÀÏÇÏ°Ô ¸»ÀÔ´Ï´Ù.
DBÀÇ °æ¿ì´Â ´Ù¸¥ ¾ê±â°¡ µÇ´Â µ¥¿ä, ¾Õ¼± ´äº¯¿¡¼­ ÀÌ¹Ì ¸»¾¸µå·ÈµíÀÌ DBÀÇ IP¿Í
SID, id, passwd¸¦ Source Code ³»¿¡ hard cordingÇÏÁö ¸»°í, configuration file¿¡
ÀúÀåÇÏ¿© ½ÇÇà½Ã ȯ°æ¿¡ ¸Â°Ô Á¢¼ÓÇϵµ·Ï ÇÏ¸é ¿øÇϽô °á°ú¸¦ ¾òÀ» ¼ö ÀÖ½À´Ï´Ù.
(À§¿Í °°Àº ¸ñÀûÀÌ ¾Æ´Ï´õ¶óµµ ½Ã½ºÅÛ ¿î¿µÀÚ °ü¸®ÀÇ Æí¸®¸¦ À§ÇÏ¿© ÀÌ·¸°Ôµé ÇÕ´Ï´Ù.)



6. Ȥ½Ã ÇöÀç ÀÌ·¯ÇÑ È¯°æÀ» ±¸ÃàÇÏ¿© »ç¿ëÇÏ°í ÀÖ´Â °÷À» ¾È´Ù¸é, Á» ¾Ë·Á
ÁÖ¼¼¿ä.


- ¾ÆÁ÷ Java·Î SI¸¦ ±¸ÃàÇÑ »ç·Ê´Â ±¹³»¿¡ ¸¹Áö ¾Ê½À´Ï´Ù. ¾ÆÁ÷ ±îÁö R&D´Ü°è¿¡
¸Ó¹°·¯ ÀÖ´Â °ÍÀÌ ½ÇÁ¤ÀÔ´Ï´Ù¸¸ ¿äÁòµé¾î ±¹°¡±â°ü°ú ¸ð site¿¡¼­ ÀÚ¹Ù·Î
½Ã½ºÅÛ ±¸Çö Ãʱ⠴ܰ迡 ÀÖ´Â °÷Àº ÀÖ½À´Ï´Ù.
°³ÀÎÀûÀ¸·Î ¿¬¶ô ÁÖ½Ã¸é ´äº¯ µå¸®°Ú½À´Ï´Ù.
ºÐ¸íÇÑ °ÍÀº SIÀÇ ¿µ¿ªÀº ¸¹Àº ºÎºÐ¿¡ ÀÚ¹Ù°¡ ÇÙ½ÉÀûÀÎ À§Ä¡¸¦ ÀÚ¸®ÀâÀ» °ÍÀ̶õ
°ÍÀº ¸¹Àº Àü¹®°¡µéÀÌ ÇÑ°á°°ÀÌ ¾ê±âÇÏ°í ÀÖ½À´Ï´Ù.


=================================================================
ÀÌ¿ø¿µ
°³¹ß±â¼ú±×·ì, Application Solution Team, ITG, LG-EDS Systems.
ÁÖ¼Ò: ÀÎõ °è¾ç±¸ È¿¼º2µ¿ 236-1. 407-042
E-Mail : wyounglee@lgeds.lg.co.kr
HomePage: http://math.kyungpook.ac.kr/~leewy/,
http://165.244.227.233/~leewy/
PCS : 019-310-7324 Home: (032)571-8938
Office: (032)540-4243
-----------------------------------------------------------------





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°ü·Ã À̹ÌÁö URL:


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