oracle二进制怎么存,oracle数据库二进制文件
如何将二进制文件存入Oracle数据库中
先把文件读取到内存,再以二进制格式保持到数据库中的大字段中(clob或clob)。
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写大对象。
Java code
public static void main(String[] args) {
// TODO Auto-generated method stub
Connection conn = null;
Statement stat = null;
ResultSet rs = null;
OutputStream os = null;
FileInputStream fis = null;
int bs = 0;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:oraDB","bigfou","---");
conn.setAutoCommit(false);
stat = conn.createStatement();
stat.executeUpdate("insert into t_video(id,video) values(1,empty_blob())");
rs = stat.executeQuery("select video from t_video where id = 1");
rs.next();
oracle.sql.BLOB blo = (oracle.sql.BLOB)rs.getBlob(1);
os = blo.getBinaryOutputStream();
bs = blo.getBufferSize();
fis = new FileInputStream("D:\\Temp\\MPlayer-CVS-20040808-KK\\mplayer.exe");
byte[] buf = new byte[bs];
int length = 0;
while(true)
{
length = fis.read(buf);
if(length == -1) break;
os.write(buf,0,length);
}
os.close();
os = null;
fis.close();
fis = null;
conn.commit();
conn.setAutoCommit(true);
conn.close();
} catch(Exception ex) {
ex.printStackTrace();
}
}
读大对象
Java code
InputStream is = null;
FileOutputStream fos = null;
byte[] buf = null;
int bs = 0;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:oraDB","bigfou","-");
conn.setAutoCommit(false);
stat = conn.createStatement();
rs = stat.executeQuery("select video from t_video where id = 1");
rs.next();
oracle.sql.BLOB blo = (oracle.sql.BLOB)rs.getBlob(1);
bs = blo.getBufferSize();
buf = new byte[bs];
int length = 0;
is = blo.getBinaryStream();
fos = new FileOutputStream("d:\\test.exe");
while(true) {
length = is.read(buf);
if(length == -1) break;
fos.write(buf,0,length);
}
fos.close();
fos = null;
is.close();
is = null;
conn.commit();
conn.setAutoCommit(true);
conn.close();
...
如何把 上传的文件 转成二进制存入oracle中的BLOB字段上,恳请高手们指导一下
更新数据的时候,写insert语句的时候,不更新blob字段,blob字段对应的数据用 empty_blob() 代替就行。
(注意:在执行上面那个 sql 之前,一定要把 connection 设置成不自动提交: conn.setAutoCommit(false); )
最后单独出来blob字段:
//把 blob 字段取出来
String sql = "select ANNEX from market_info_collect_t where info_id='"
+ infoId + "' for update ";
Statement stt=null;
stt = conn.createStatement();
rs = stt.executeQuery(sql);
if (rs.next()) {
blob = (oracle.sql.BLOB) rs.getBlob("ANNEX");
outStream = blob.getBinaryOutputStream();
instream = myFile.getContentStream();
byte[] data = new byte[instream.available()];
instream.read(data);
outStream.write(data, 0, data.length);
}
instream.close();
outStream.flush();
outStream.close();
上面这段是我以前写过的代码中的一部分,你看一下,希望对你能有帮助。。。
ORACLE 存二进制用什么数据类型
可以用blob或bfile类型来存储该类二进制数据。具体说明如下: ★ blob:用来存储可变长度的二进制数据,blob数据在数据库之间或在客户机与服务器进程之间传递,yVSkyV
当前标题:oracle二进制怎么存,oracle数据库二进制文件
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