JAVA存取PG大对象类型OID数据

转载地址：http://my.oschina.net/liuyuanyuangogo/blog/151537

pg用大对象存储二进制数据的老文档：http://jdbc.postgresql.org/documentation/80/binary-data.html

//VM配置:256M-512M

//通过lo_import（‘文件路径’）函数向oid字段插入二进制文件，通过（不会内存溢出）。

/**
*
* @author Liu Yuanyuan
*/
private void insertOid()
{
String driver = "org.postgresql.Driver";//"com.highgo.jdbc.Driver";//192.168.100.125
String url = "jdbc:postgresql://" + "127.0.0.1" + ":" + "5866" + "/" + "db1";
Connection conn = null;
Statement stmt = null;
try
{
Class.forName(driver);
System.out.println("success find class");
conn = DriverManager.getConnection(url, "highgo", "hg");
System.out.println("success connect");
stmt = conn.createStatement();
//driectly insert
String f = "d:/1.jpg";
stmt = conn.prepareStatement("INSERT INTO oidtable VALUES (11, lo_import(\'"+f+"\'))");
//or by update
//String f = "d://2.jpg";
//PreparedStatement ps = conn.prepareStatement("update oidtable set obj = lo_import(\'"+f+"\') where id=?");
//ps.setInt(1,11);
ps.executeUpdate();
}
catch(Exception ex)
{
ex.printStackTrace(System.out);
}
finally
{
try
{
if(stmt!=null)
stmt.close();
if(conn!=null)
conn.close();
}
catch(Exception ex)
{
ex.printStackTrace(System.out);
}
finally
{
System.out.println("finally");
}
}
}

//VM配置:256M-512M

//直接通过setLong()向oid插入1GB的文件，通过（2分钟之内插入完毕）;