Oracle blob字段类型文件读写实例

快来打我* 2022-03-29 06:08 321阅读 0赞

Oracle blob字段类型 文件读写实例

准备环境：pl/sql  java JDK  Oracle JDBC driver

## 创建blob\_test表 ##

create table blob\_test(

id number,

name varchar(50),

word blob

)

## 先插入空白数据然后执行更新 ##

Code:

**package** sql;     //JDBC connect management for Oracle require Oracle Jdbc driver

**import** java.sql.Connection;

**import** java.sql.DriverManager;

**public** **class** DBConnection \{

**public** **static** Connection getDBConnection() **throws** Exception \{

Connection con = **null**;

String driver = "oracle.jdbc.driver.OracleDriver";//database driver

String url = "jdbc:oracle:thin:@localhost:1521:ORCL";//database URL

String user = "system";           //database name

String password = "3edc4rfv";       //database Password

Class.*forName*(driver);

con = DriverManager.*getConnection*(url, user, password);

**return** con;

\---------------------------------------------------------------------------------------------------------------------------------

**package sql;**

**import java.io.\*;**

**import java.sql.\*;**

** **

**import oracle.sql.BLOB;**

**import sql.DBConnection;**

**public class bolb\_test \{**

**    public static void main(String\[\] args) throws SQLException \{**

**            Connection con=null ;      **

**            long start=System.currentTimeMillis();        ** ** //count runtime**

**         **   CallableStatement pstmt=null;

InputStream fin=null;

OutputStream outStream=null;

String path = "D:\\\\test.txt";

File file = new File(path);

try\{

con = DBConnection.getDBConnection();

con.setAutoCommit(false);

String sql="insert into blob\_test values(?,?,?)";

**//insert database**

**           ** pstmt = con.prepareCall(sql);

for(int i=0;i<10;i++)

String name = "Young\_"+i;

int id = 1;

pstmt.setInt(1,id+i);

pstmt.setString(2, name);

Blob word = BLOB.empty\_lob();

pstmt.setBlob(3, word);

pstmt.execute();

System.out.print("instert ok\\n");

Statement stmt = con.createStatement();

ResultSet rs =stmt.executeQuery("select id,word from blob\_test for update");

**           ** **//get specially columns and rows for update**

**            while(rs.next()) \{**

**                       ** **//System.out.print(rs.getInt(1)+rs.getString(2)+"\\n");****//print select sql for debug**

**                BLOB blob = (BLOB) rs.getBlob("word");**

**                outStream = blob.getBinaryOutputStream();**

**                fin = new FileInputStream(file);** ** //put file into stream**

**                byte\[\] b = new byte\[blob.getBufferSize()\];**

**                int len = 0;**

**                while ((len = fin.read(b)) != -1) \{**

**                    outStream.write(b, 0, len);**

**                \}**

**           **

**                fin.close();**

**                outStream.flush();**

**                outStream.close();**

**            \}**

**                System.out.print("\\nupdate ok\\n");**

**           **

**                con.commit(); **

**         \}**

**       **

**          catch (Exception e) \{**

**            e.printStackTrace();**

**        \}**

**         **

**         con.close();**

**       **

**         long end=System.currentTimeMillis();**

**         System.out.println(end-start);**

**    \}**

** **

**\}  **

** **

![2012122201282188.jpg][]

**    **

## 读取blob文件 ##

package sql;

import java.io.\*;

import java.sql.\*;

import oracle.sql.BLOB;

import sql.DBConnection;

public class getbolb\_test \{

public static void main(String\[\] args) throws SQLException \{

Connection con=null ;

long start=System.currentTimeMillis();               //count runtime

String path = "D:\\\\test1.txt";

File file = new File(path);

try\{

con = DBConnection.getDBConnection();

con.setAutoCommit(false);

Statement stmt = con.createStatement();

ResultSet rs =stmt.executeQuery("select id,word from blob\_test where id=10");

//get blob form your table

if(rs.next()) \{

BLOB blob = (BLOB) rs.getBlob("word");

//get word column

FileOutputStream output = new FileOutputStream(file);

// define a file output stream

InputStream input = blob.getBinaryStream();//put blob into input

byte\[\] buffer = new byte\[blob.getBufferSize()\];

//if use 1024 it will lose some bytes

int len = 0;

while ((len = input.read(buffer)) != -1) \{

//get all input stream into output file stream

output.write(buffer, 0, len);

input.close();

output.flush();

output.close();

System.out.print("\\ndownload ok\\n");

catch (Exception e) \{

e.printStackTrace();

con.close();

long end=System.currentTimeMillis();

System.out.println(end-start);

![2012122201284331.jpg][]

[2012122201282188.jpg]: /images/20220329/92d4eca247864f6abe06d2d3fc58e36e.png
[2012122201284331.jpg]: /images/20220329/0355649c18444664b7de26d36806194a.png

Oracle blob字段类型文件读写实例

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