JDBC读写Oracle10g的CLOB、BLOB

JDBC读写Oracle10g的CLOB、BLOB

 

环境：

Windows XP Professional 5.1 Build 2600 (Service Pack 3)

Oracle Database 10g Enterprise Edition Release 10.2.0.1.0

http://download.oracle.com/otn/utilities_drivers/jdbc/10201/ojdbc14_g.jar

JDK1.6u16

 

TNS名：

# tnsnames.ora Network Configuration File: d:\oracle\product\10.2.0\client_1\NETWORK\ADMIN\tnsnames.ora 
# Generated by Oracle configuration tools. 

ORADB = 
    (DESCRIPTION = 
        (ADDRESS_LIST = 
            (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.100)(PORT = 1521)) 
        ) 
        (CONNECT_DATA = 
            (SID = ORCL) 
        ) 
    ) 

MYORCL = 
    (DESCRIPTION = 
        (ADDRESS_LIST = 
            (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.100)(PORT = 1521)) 
        ) 
        (CONNECT_DATA = 
            (SERVICE_NAME = myorcl) 
        ) 
    ) 

 

数据脚本：

create table TEST_ORALOB 
( 
    ID         VARCHAR2(20), 
    TSBLOB BLOB not null, 
    TSCLOB CLOB not null 
)

 

测试代码：

package lavasoft.oralob.common; 

import oracle.sql.BLOB; 

import java.io.*; 
import java.sql.*; 

/** 
* JDBC读写Oracle10g的CLOB、BLOB 
* 
* @author: leizhimin 2010-5-26 21:12:55 
*/ 
public class TestOraLob { 

        public static void main(String[] args) { 
                insertBlob(); 
                queryBlob(); 
        } 

        public static void insertBlob() { 
                Connection conn = DBToolkit.getConnection(); 
                PreparedStatement ps = null; 
                try { 
                        String sql = "insert into test_oralob (ID, TSBLOB, TSCLOB) values (?, ?, ?)"; 
                        ps = conn.prepareStatement(sql); 
                        ps.setString(1, "100"); 
                        //设置二进制BLOB参数 
                        File file_blob = new File("C:\\a.jpg"); 
                        InputStream in = new BufferedInputStream(new FileInputStream(file_blob)); 
                        ps.setBinaryStream(2, in, (int) file_blob.length()); 
                        //设置二进制CLOB参数 
                        File file_clob = new File("c:\\a.txt"); 
                        InputStreamReader reader = new InputStreamReader(new FileInputStream(file_clob)); 
                        ps.setCharacterStream(3, reader, (int) file_clob.length()); 
                        ps.executeUpdate(); 
                        in.close(); 
                } catch (IOException e) { 
                        e.printStackTrace(); 
                } catch (SQLException e) { 
                        e.printStackTrace(); 
                } finally { 
                        DBToolkit.closeConnection(conn); 
                } 
        } 

        public static void queryBlob() { 
                Connection conn = DBToolkit.getConnection(); 
                PreparedStatement ps = null; 
                Statement stmt = null; 
                ResultSet rs = null; 
                try { 
                        String sql = "select TSBLOB from TEST_ORALOB where id ='100'"; 
                        stmt = conn.createStatement(); 
                        rs = stmt.executeQuery(sql); 
                        if (rs.next()) { 
                                //读取Oracle的BLOB字段 
                                InputStream in = rs.getBinaryStream(1); 
                                File file = new File("c:\\a1.jpg"); 
                                OutputStream out = new BufferedOutputStream(new FileOutputStream(file)); 
                                byte[] buff1 = new byte[1024]; 
                                for (int i = 0; (i = in.read(buff1)) > 0;) { 
                                        out.write(buff1, 0, i); 
                                } 
                                out.flush(); 
                                out.close(); 
                                in.close(); 
                                //读取Oracle的CLOB字段 
                                char[] buff2 = new char[1024]; 
                                File file_clob = new File("c:\\a1.txt"); 
                                OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(file_clob)); 
                                Reader reader = rs.getCharacterStream(1); 
                                for (int i = 0; (i = reader.read(buff2)) > 0;) { 
                                        writer.write(buff2, 0, i); 
                                } 
                                writer.flush(); 
                                writer.close(); 
                                reader.close(); 
                        } 
                        rs.close(); 
                        stmt.close(); 
                } catch (IOException e) { 
                        e.printStackTrace(); 
                } catch (SQLException e) { 
                        e.printStackTrace(); 
                } finally { 
                        DBToolkit.closeConnection(conn); 
                } 
        } 
}

 

执行后没有异常，查看C盘，文件已经复制出一份，说明写入和读取都是成功的。

 

 

http://download-west.oracle.com/docs/cd/B12037_01/java.101/b10979/toc.htm

http://www.oracle.com/technology/global/cn/sample_code/tech/java/sqlj_jdbc/files/oracle10g/index.html

http://www.oracle.com/technology/global/cn/sample_code/tech/java/sqlj_jdbc/index.html

http://www.oracle.com/technology/global/cn/sample_code/tech/java/codesnippet/jdbc/index.html

http://www.oracle.com/technology/global/cn/software/tech/java/sqlj_jdbc/index.html

 

如果是将一个字符串写入Clob字段，则需要做简单的变化：

  //设置二进制CLOB参数    
  String xxx = "abcdefg"; 
  ps.setCharacterStream(3, new StringReader(xxx), xxx.getBytes("GBK").length);    
  ps.executeUpdate();    
  in.close();