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();
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Oracle10gJDBCJ2SE
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