5.7. PostgreSQL ¶Ô JDBC APIµÄÀ©Õ¹

5.7.1. ·ÃÎÊÕâЩÀ©Õ¹

Òª»ñµÃijЩÀ©Õ¹£¬ÄãÐèҪʹÓà org.postgresql.PGConnection ÀàÀïµÄһЩ¶îÍâµÄ·½·¨£¬Õâʱ£¬ÄãÐèҪת»» Driver.getConnection() µÄ·µ»ØÖµ£®±ÈÈç¡Ã

Connection db = Driver.getConnection(url, username, password);
// ...
// ÉÔºó
Fastpath fp = ((org.postgresql.PGConnection)db).getFastpathAPI();

public class PGConnection

public class Fastpath extends Object

java.lang.Object
   |
   +----org.postgresql.fastpath.Fastpath

import org.postgresql.fastpath.*;

Fastpath fp = ((org.postgresql.PGConnection)conn).getFastpathAPI();

public class FastpathArg extends Object

java.lang.Object
   |
   +----org.postgresql.fastpath.FastpathArg

5.7.2. ¼¸ºÎÊý¾ÝÀàÐÍ

PostgreSQL ÓÐÒ»¸öÍù±íÀï´æ´¢¼¸ºÎÌØÐÔµÄÊý¾ÝÀàÐͼ¯£® ·¶Î§°üÀ¨µã£¬Ïߣ¬ºÍ¶à±ßÐΣ® ÎÒÃÇͨ¹ý org.postgresql.geometric °üÔÚ Java ÀïÖ§³ÖÕâЩÀàÐÍ£® Ëü°üÀ¨À©Õ¹ÁË org.postgresql.util.PGobject ÀàµÄÀ࣮ ²Î¿¼¸ÃÀà»ñÈ¡ÈçºÎʵÏÖÄã×Ô¼ºµÄÊý¾ÝÀàÐ͵ĿØÖÆÆ÷µÄϸ½Ú£®

Class org.postgresql.geometric.PGbox

java.lang.Object
   |
   +----org.postgresql.util.PGobject
	   |
	   +----org.postgresql.geometric.PGbox

   public class PGbox extends PGobject implements Serializable, 
Cloneable

   Õâ¸öÀàÔÚPostgreSQLÀï±íʾºÐ×Ó (box) Êý¾ÝÀàÐÍ£®

±äÁ¿

 public PGpoint point[]

	  ÕâЩÊǺÐ×ÓµÄÁ½¸ö¶Ô½Çµã£®

¹¹ÔìÆ÷

 public PGbox(double x1,
	      double y1,
	      double x2,
	      double y2)

	²ÎÊý¡Ã
		x1 - µÚÒ»¸ö x ×ø±ê
		y1 - µÚÒ»¸ö y ×ø±ê
		x2 - µÚ¶þ¸ö x ×ø±ê
		y2 - µÚ¶þ¸ö y ×ø±ê

 public PGbox(PGpoint p1,
	      PGpoint p2)

	²ÎÊý¡Ã
		p1 - µÚÒ»¸öµã
		p2 - µÚ¶þ¸öµã

 public PGbox(String s) throws SQLException
			    
	²ÎÊý¡Ã
		s -PostgreSQLÓï·¨ÀïµÄºÐ×Ó¶¨Òå

	Å׳ö¡Ã SQLException
		Èç¹û¶¨Òå·Ç·¨
		
 public PGbox()

	  ±ØÐëµÄ¹¹Ôì(·½·¨)
	      
·½·¨

 public void setValue(String value) throws SQLException
		
	  Õâ¸ö·½·¨ÉèÖÃÕâ¸ö¶ÔÏóµÄÖµ£®ËüÓ¦¸Ã±»ÖØÔØ£¬µ«ÊÇÈÔÈ»±»×ÓÀàµ÷Óã®
			    
	²ÎÊý¡Ã
		value - Ò»¸ö´ú±í¶ÔÏóÖµµÄ×Ö·û´®
	Å׳ö¡Ã SQLException
		Èç¹û´ËÊýÖµ¶ÔÕâ¸öÀàÐͶøÑÔÊÇ·Ç·¨µÄ

	¸²¸Ç¡Ã
		 Àà PGobject ÀïµÄ setValue

 public boolean equals(Object obj)

	²ÎÊý¡Ã
		obj - Òª±È½ÏµÄ¶ÔÏó
		
	·µ»Ø¡Ã
		Èç¹ûÁ½¸öºÐ×ÓÏàµÈ·µ»ØÕæ (true)
	  
	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ equals

 public Object clone()
	
	  ±ØÐ븲¸ÇÕâ¸ö·½·¨ÒÔÔÊÐí¶ÔÏ󱻿Ë¡ (cloned)

	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ equals
   
 public String getValue()
	
	·µ»Ø¡Ã
		PostgreSQL¾ä·¨ÐèÒªµÄ PGbox 

	¸²¸Ç¡Ã
		getValue in class PGobject

Class org.postgresql.geometric.PGcircle

java.lang.Object
   |
   +----org.postgresql.util.PGobject
	   |
	   +----org.postgresql.geometric.PGcircle
	
   public class PGcircle extends PGobject implements Serializable, 
Cloneable
	       
   Õâ¸öÀà´ú±í PostgreSQL µÄÔ²Êý¾ÝÀàÐÍ£¬ÓÉÒ»¸öµãºÍÒ»¸ö°ë¾¶×é³É

±äÁ¿

 public PGpoint center
	   
	  ÕâÊÇÔ²ÐÄ
 
 double radius
	   
	  ÕâÊǰ뾶
   
¹¹ÔìÆ÷   

 public PGcircle(double x,
		 double y,
		 double r)
	  
	²ÎÊý¡Ã
	       x - Ô²ÐÄ×ø±ê
	       y - Ô²ÐÄ×ø±ê
	       r - Ô²°ë¾¶

 public PGcircle(PGpoint c,
		 double r)
	  
	²ÎÊý¡Ã
		c - ÃèÊöÔ²ÐÄµÄ PGpoint
		r - Ô²°ë¾¶

 public PGcircle(String s) throws SQLException

	²ÎÊý¡Ã
		s -PostgreSQLÀïÓï·¨¶¨ÒåµÄÔ²£®

	Å׳ö¡Ã SQLException
		Èç¹ûת»»Ê§°Ü

 public PGcircle()

	  Õâ¸ö¹¹Ôì(·½·¨)±»Çý¶¯Æ÷ʹÓã®
	    
·½·¨   

 public void setValue(String s) throws SQLException

	²ÎÊý¡Ã
		s - ÓÃPostgreSQLµÄÓï·¨¶¨ÒåµÄÔ²£®

	Å׳ö¡Ã SQLException
		Èç¹ûת»»Ê§°Ü

	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ setValue

 public boolean equals(Object obj)

	²ÎÊý¡Ã
		obj - Òª¶Ô±ÈµÄ¶ÔÏó
	    
	·µ»Ø¡Ã
		Èç¹ûÁ½¸öÔ²Ïàͬ·µ»ØÕæ (true)

	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ equals

 public Object clone()

	±ØÐëÖØÔØÕâ¸ö·½·¨ÒÔ±ãÔÊÐí¶ÔÏ󱻿Ë¡ (cloned)

	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ clone

 public String getValue()

	·µ»Ø¡Ã
		PostgreSQL Óï·¨ÀïµÄ PGcircle ×Ö´®
	
	¸²¸Ç¡Ã
		PGobject ÀïµÄ getValue

Class org.postgresql.geometric.PGline

java.lang.Object
   |
   +----org.postgresql.util.PGobject
	   |
	   +----org.postgresql.geometric.PGline

   public class PGline extends PGobject implements Serializable, 
Cloneable

Õâ¸öÀàʵÏÖÓÉÁ½¸öµã×é³ÉµÄÏߣ®Ä¿Ç°Ïß»¹Ã»ÓÐÔÚºó¶ËʵÏÖ£¬
µ«Õâ¸öÀà±£Ö¤ÔÚºó¶ËʵÏÖºó¼´¿ÉʹÓÃ(Ïß)£®

±äÁ¿
   
 public PGpoint point[]
     
	  ÕâÊÇÁ½¸öµã£®

¹¹ÔìÆ÷

 public PGline(double x1,
	       double y1,
	       double x2,
	       double y2)

	²ÎÊý¡Ã
		x1 - µÚÒ»¸öµãµÄx×ø±ê
		y1 - µÚÒ»¸öµãµÄy×ø±ê
		x2 - µÚ¶þ¸öµãµÄx×ø±ê
		y2 - µÚ¶þ¸öµãµÄy×ø±ê

 public PGline(PGpoint p1,
	       PGpoint p2)
     
	²ÎÊý¡Ã
		p1 - µÚÒ»¸öµã
		p2 - µÚ¶þ¸öµã

 public PGline(String s) throws SQLException
	       
	²ÎÊý¡Ã
		s -PostgreSQLÓï·¨¶¨ÒåµÄµã£®

	Å׳ö¡Ã SQLException
		µ±·¢Éúת»»´íÎóʱ

 public PGline()

	  Çý¶¯ÐèÒª
	       
·½·¨

 public void setValue(String s) throws SQLException

	²ÎÊý¡Ã
		s -PostgreSQLÀïÓï·¨µÄÏ߶εĶ¨Òå

	Å׳ö¡Ã SQLException
		µ±·¢Éúת»»´íÎóʱ

	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ setValue
		
 public boolean equals(Object obj)

	²ÎÊý¡Ã
		obj - Òª±È½ÏµÄ¶ÔÏó
	       
	·µ»Ø¡Ã
		Èç¹ûÁ½ÌõÏ߶ÎÏàͬ·µ»ØÕæ (true)
   
	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ equals

 public Object clone()
	
	  Õâ¸ö·½·¨±ØÐë±»ÖØÔØÒÔ±ãÔÊÐíÕâ¸ö¶ÔÏó¿ÉÒÔ±»¿Ë¡

	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ clone

 public String getValue()
   
	·µ»Ø¡Ã
		PostgreSQL Óï·¨ÀïµÄ PGline 
	
	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ getValue

Class org.postgresql.geometric.PGlseg
	     
java.lang.Object
   |
   +----org.postgresql.util.PGobject
	   |
	   +----org.postgresql.geometric.PGlseg
	  
   public class PGlseg extends PGobject implements Serializable, 
Cloneable
 
   ÕâÑùʵÏÖÁËÒ»Ìõ°üº¬Á½¸öµãµÄ lseg (Ï߶Î)

±äÁ¿

 public PGpoint point[]
	   
	  ÕâÀïÊÇÁ½¸öµã

¹¹ÔìÆ÷
   
 public PGlseg(double x1,
	       double y1,
	       double x2,
	       double y2)
     
	²ÎÊý¡Ã

		x1 - µÚÒ»¸öµãµÄx×ø±ê
		y1 - µÚÒ»¸öµãµÄy×ø±ê
		x2 - µÚ¶þ¸öµãµÄx×ø±ê
		y2 - µÚ¶þ¸öµãµÄy×ø±ê

 public PGlseg(PGpoint p1,
	       PGpoint p2)
	   
	²ÎÊý¡Ã
		p1 - µÚÒ»¸öµã
		p2 - µÚ¶þ¸öµã
   
 public PGlseg(String s) throws SQLException

	²ÎÊý¡Ã
		s -PostgreSQLÀïÓï·¨¶ÔÏ߶ζ¨ÒåµÄ×Ö´®£®

	Å׳ö¡Ã SQLException
		ÔÚ·¢Éúת»»´íÎóʱ

 public PGlseg()

	  Çý¶¯ÒªÇó
	       
·½·¨    
   
 public void setValue(String s) throws SQLException
   
	²ÎÊý¡Ã
		s -PostgreSQLÀïÓï·¨¶ÔÏ߶ζ¨ÒåµÄ×Ö´®

	Å׳ö¡Ã SQLException
		ÔÚ·¢Éúת»»´íÎóʱ
     
	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ setValue
		
 public boolean equals(Object obj)

	²ÎÊý¡Ã
		obj - Òª±È½ÏµÄ¶ÔÏó
	       
	·µ»Ø¡Ã
		Èç¹ûÁ½ÌõÏ߶ÎÏàµÈ
   
	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ equals
   
 public Object clone()

	  ±ØÐ븲¸ÇÕâ¸ö·½·¨ÒÔ±ãÔÊÐíÕâ¸ö¶ÔÏ󱻿Ë¡

	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ getValue

 public String getValue()

	·µ»Ø¡Ã
		PostgreSQL Óï·¨ÀïµÄ PGlseg
	
	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ getValue

Class org.postgresql.geometric.PGpath
				
java.lang.Object
   |
   +----org.postgresql.util.PGobject
	   |
	   +----org.postgresql.geometric.PGpath
	  
   public class PGpath extends PGobject implements Serializable, 
Cloneable
	       
   ÕâÊÇ·¾¶( ¶àÏ߶ÎͼÐÎ, ¿ÉÒÔΪ·â±ÕµÄ )µÄʵÏÖ
	   
±äÁ¿

 public boolean open
	       
	  Èç¹û·¾¶¿ª·ÅʱΪÕæ (True)£¬Îª·â±ÕʱΪ¼Ù

 public PGpoint points[]

	  ¶¨Òå·¾¶µÄµã

¹¹ÔìÆ÷   

 public PGpath(PGpoint points[],
	       boolean open)
	  
	²ÎÊý¡Ã
		points - ¶¨Òå·¾¶µÄ PGpoints
		open - Èç¹û·¾¶ÊÇ¿ª·ÅµÄΪÕæ (True)£¬·â±ÕΪ¼Ù (false)

 public PGpath()

	  Çý¶¯ÐèÒª

 public PGpath(String s) throws SQLException

	²ÎÊý¡Ã
		s -PostgreSQLµÄÓï·¨¶¨ÒåµÄ·¾¶£®

	Å׳ö¡Ã SQLException
		ÔÚ·¢Éúת»»´íÎóʱ

·½·¨

 public void setValue(String s) throws SQLException
   
	²ÎÊý¡Ã
		s -PostgreSQLµÄÓï·¨¶¨ÒåµÄ·¾¶µÄ×Ö´®
	   
	Å׳ö¡Ã SQLException
		ÔÚ·¢Éúת»»Ê§°Üʱ

	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ setValue

 public boolean equals(Object obj)

	²ÎÊý¡Ã
		obj - Òª±È½ÏµÄ¶ÔÏó

	·µ»Ø¡Ã
		Èç¹ûÁ½¸ö·¾¶Ïàͬ·µ»ØÕæ (true)

	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ equals

 public Object clone()

	  ±ØÐ븲¸ÇÕâ¸ö·½·¨ÒÔ±ãÔÊÐíÕâ¸ö¶ÔÏ󱻿Ë¡

	¸²¸Ç¡Ã
		clone in class PGobject

 public String getValue()

	  Õâ¸ö·½·¨·µ»ØPostgreSQLÓï·¨µÄ¶à±ßÐÎ


	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ getValue

 public boolean isOpen()

     Èç¹û·¾¶ÊÇ¿ª·ÅµÄÕâ¸ö·½·¨·µ»ØÕæ (true)

 public boolean isClosed()

     Èç¹û·¾¶ÊÇ·â±ÕµÄÕâ¸ö·½·¨·µ»ØÕæ (true)

 public void closePath()

     ±ê¼Ç·¾¶Îª·â±Õ

 public void openPath()

     ±ê¼Ç·¾¶Îª¿ª·Å

Class org.postgresql.geometric.PGpoint
				
java.lang.Object
   |
   +----org.postgresql.util.PGobject
	   |
	   +----org.postgresql.geometric.PGpoint
	  
   public class PGpoint extends PGobject implements Serializable, 
Cloneable

   Õâ¸öÀàʵÏÖÁË java.awt.Point µÄÒ»¸ö°æ±¾£¬µ«Óà double ±íʾ²ÎÊý£®

   Ëü¶ÔÓ¦ÓÚ PostgreSQL ÀïµÄ point Êý¾ÝÀàÐÍ£®

±äÁ¿

 public double x

	  µãµÄ X ×ø±ê

 public double y

	  µãµÄ Y ×ø±ê

¹¹ÔìÆ÷

 public PGpoint(double x,
		double y)

	²ÎÊý¡Ã
		x - ×ø±ê
		y - ×ø±ê

 public PGpoint(String value) throws SQLException
     
	  Õâ¸ö·½·¨Ö÷Òª´ÓÆäËû¼¸ºÎÀàÐ͵÷Óà -- µ±Ò»¸öµãǶÈëËüÃǵĶ¨ÒåÖÐʱ£®
	     
	²ÎÊý¡Ã
		value -PostgreSQLÓï·¨¶¨ÒåµÄµã
   
 public PGpoint()
	  
	  Çý¶¯ÐèÒª

·½·¨

 public void setValue(String s) throws SQLException

	²ÎÊý¡Ã
		s -PostgreSQLÓï·¨¶¨ÒåµÄµã

	Å׳ö¡Ã SQLException
		ÔÚת»»Ê§°Üʱ

	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ setValue
	  
 public boolean equals(Object obj)

	²ÎÊý¡Ã
		obj - Òª±È½ÏµÄ¶ÔÏó

	·µ»Ø¡Ã
		Èç¹ûÁ½¸ö¶ÔÏóÏàͬ·µ»ØÕæ (true)

	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ equals

 public Object clone()
		
	  ±ØÐ븲¸ÇÕâ¸ö·½·¨ÒÔ±ãÔÊÐíÕâ¸ö¶ÔÏ󱻿Ë¡

	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ clone
	  
 public String getValue()       
    
	·µ»Ø¡Ã
		  PostgreSQLÀïÓï·¨ PGpoint µÄ±íʾ£®

	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ getValue
	  
 public void translate(int x,
		       int y)

	  ¶Ôµã×öÖ¸¶¨ÊýÁ¿µÄת»»(λÒÆ)£®

	²ÎÊý¡Ã
		x - Ïò x ÖáÔö¼ÓµÄÕûÐÍÊýÁ¿
		y - Ïò y ÖáÔö¼ÓµÄÕûÐÍÊýÁ¿

 public void translate(double x,
		       double y)
	  
	  ¶Ôµã×öÖ¸¶¨ÊýÁ¿µÄת»»(λÒÆ)£®
 
	²ÎÊý¡Ã
		x - Ïò x ÖáÔö¼ÓµÄË«¾«¶ÈÐÍÊýÁ¿
		y - Ïò y ÖáÔö¼ÓµÄË«¾«¶ÈÐÍÊýÁ¿

 public void move(int x,
		  int y)
		
	  °ÑµãÒƵ½Ö¸¶¨×ø±ê£®

	²ÎÊý¡Ã
		x - ÕûÊý×ø±ê
		y - ÕûÊý×ø±ê

public void move(double x,
		  double y)
	  
	  °ÑµãÒƵ½Ö¸¶¨×ø±ê£®

	²ÎÊý¡Ã
		x - Ë«¾«¶È×ø±ê
		y - Ë«¾«¶È×ø±ê

 public void setLocation(int x,
			 int y)

	  °ÑµãÒƵ½Ö¸¶¨×ø±ê. ²Î¿¼
	  java.awt.Point »ñÈ¡Õâ¸ö·½·¨µÄÃèÊöÐÅÏ¢

	²ÎÊý¡Ã
		x - ÕûÊý×ø±ê
		y - ÕûÊý×ø±ê

	ÓÖ¼û¡Ã
		Point

 public void setLocation(Point p)

	  °ÑµãÒƵ½Ö¸¶¨×ø±ê. ²Î¿¼
	  java.awt.Point »ñÈ¡Õâ¸ö·½·¨µÄÃèÊöÐÅÏ¢

	²ÎÊý¡Ã
		p - Òƶ¯µÄÄ¿µÄµã (Point)

	ÓÖ¼û¡Ã
		Point

Class org.postgresql.geometric.PGpolygon
				
java.lang.Object
   |
   +----org.postgresql.util.PGobject
	   |
	   +----org.postgresql.geometric.PGpolygon

   public class PGpolygon extends PGobject implements Serializable, 
Cloneable
	       
   Õâ¸öÀàÔÚPostgreSQLÀïʵÏÖÁË polygon (¶à±ßÐÎ)Êý¾ÝÀàÐÍ£®

±äÁ¿

 public PGpoint points[]

	   ¶¨Òå polygon (¶à±ßÐÎ)µÄµã
				
¹¹ÔìÆ÷

 public PGpolygon(PGpoint points[])

	  ʹÓÃÒ»¸ö PGpoints Êý×é´´½¨Ò»¸ö¶à±ßÐÎ

	²ÎÊý¡Ã
		points - ¶¨Òå¶à±ßÐÎ polygon µÄµã

 public PGpolygon(String s) throws SQLException
		 
	²ÎÊý¡Ã
		s - ÓÃPostgreSQLÓï·¨¶¨ÒåµÄ¶à±ßÐÎ.

	Å׳ö¡Ã SQLException
		ÔÚת»»Ê§°Üʱ

 public PGpolygon()

	Çý¶¯ÐèÒª

·½·¨

 public void setValue(String s) throws SQLException

	²ÎÊý¡Ã
		s - ÓÃPostgreSQLÓï·¨¶¨ÒåµÄ¶à±ßÐÎ.

	Å׳ö¡Ã SQLException
		ÔÚת»»Ê§°Üʱ

	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ setValue

 public boolean equals(Object obj)
     
	²ÎÊý¡Ã
		obj - Òª±È½ÏµÄ¶ÔÏó
				
	·µ»Ø¡Ã
		Èç¹ûÁ½¸ö¶ÔÏóÏàͬ·µ»ØÕæ (true)

	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ equals

 public Object clone()
	
	  ±ØÐ븲¸ÇÕâ¸ö·½·¨ÒÔ±ãÔÊÐíÕâ¸ö¶ÔÏ󱻿Ë¡

	¸²¸Ç¡Ã
		 Àà PGobject ÀïµÄ clone
		 
 public String getValue()

	·µ»Ø¡Ã
		 PostgreSQLÀïÓï·¨±íʾµÄ PGpolygon£®

	¸²¸Ç¡Ã
		Àà PGobject ÀïµÄ getValue

5.7.3. ´ó¶ÔÏó

±ê×¼µÄ JDBC ¹æ·¶ÀïÒ²Ö§³Ö´ó¶ÔÏó£® µ«ÊÇ£¬ÄǸö½Ó¿ÚÓÐһЩÏÞÖÆ£¬ ¶øPostgreSQLÌṩµÄ API ÔÊÐí¶Ô¶ÔÏóÄÚÈݵÄËæ»ú·ÃÎÊ£¬ ¾ÍÏóÄÇÊÇÒ»¸ö±¾µØÎļþÒ»Ñù£®

org.postgresql.largeobject °üΪ Java ÌṩÁËlibpqC ½Ó¿ÚµÄ´ó¶ÔÏó API£®Ëü°üº¬Á½¸öÀ࣬ LargeObjectManager£¬ ´¦Àí´´½¨£¬´ò¿ªºÍɾ³ý´ó¶ÔÏóµÄÈÎÎñ£»ÒÔ¼° LargeObject£¬´¦Àí¶ÀÁ¢µÄ¶ÔÏó£®

public class LargeObject extends Object

java.lang.Object
   |
   +----org.postgresql.largeobject.LargeObject

				
public class LargeObjectManager extends Object

java.lang.Object
   |
   +----org.postgresql.largeobject.LargeObjectManager

import org.postgresql.largeobject.*;
Connection  conn;
LargeObjectManager lobj;
// ... ´ò¿ªÒ»¸öÁ¬½ÓµÄ´úÂë ...
lobj = ((org.postgresql.PGConnection)myconn).getLargeObjectAPI();