Oracle blob字段文件保存与读取

文件上传

依赖包: ojdbc7-12.1.0.2jar

import oracle.jdbc.OracleResultSet;
import oracle.sql.BLOB;

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

/**
 */
public class StoreFile {
    public static void main(String[] args) {
//        insert();//新增
//        update("d:\\TEST\\test.png");//上传
        down("d:\\TEST\\code1.rar");//下载
    }

    public static void insert(){
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
//            Connection con = DriverManager.getConnection(
//                    "jdbc:oracle:thin:@10.53.20.58:1521:orcl", "longey", "123456");
            Connection con = DriverManager.getConnection(
                    "jdbc:oracle:thin:@10.0.13.21:1521:devdb", "pci", "pci");

            PreparedStatement ps = con.prepareStatement(
                    "insert into Student values(?, ?,?)");

            File f = new File("d:\\TEST\\test.png");
            FileReader fr = new FileReader(f);

            ps.setString(1, "张三");
            ps.setInt(2, 10);
            ps.setBlob(3, con.createBlob());
            int i = ps.executeUpdate();
            System.out.println(i + " records affected");

            con.close();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void update(String fp) {
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
//            Connection con = DriverManager.getConnection(
//                    "jdbc:oracle:thin:@10.53.20.58:1521:orcl", "longey", "123456");
            Connection con = DriverManager.getConnection(
                    "jdbc:oracle:thin:@10.0.13.21:1521:devdb", "pci", "pci");
            PreparedStatement ps = con.prepareStatement(
                    "insert into Student values(?, ?,?)");

            File f = new File(fp);
            updateBlob(new FileInputStream(f),con,"Student","picture","name","张三");

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void updateBlob(InputStream instream,
                                  Connection conn,
                                  String table,
                                  String blobColumn,
                                  String keyColumn,
                                  String keyValue)
            throws SQLException, IOException {
        Statement stmt = null;
        OracleResultSet rs = null;
        BLOB blob = null;
        boolean oldAutoCommit = conn.getAutoCommit();
        StringBuffer sqlBuffer = new StringBuffer();
        try {
            conn.setAutoCommit(false);
            sqlBuffer.append("select ");
            sqlBuffer.append(blobColumn);
            sqlBuffer.append(" from ");
            sqlBuffer.append(table);
            sqlBuffer.append(" where ");
            sqlBuffer.append(keyColumn);
            sqlBuffer.append(" ='");
            sqlBuffer.append(keyValue);
//注意这里的"for update"
            sqlBuffer.append("' for update ");
            stmt = conn.createStatement();
            rs = (OracleResultSet) stmt.executeQuery(sqlBuffer.toString());

            if (!rs.next()) {
                rs.close();
                stmt.close();
                throw new IllegalArgumentException(
                        "no record found for keyValue： ‘" + keyValue + "’");
            }
            blob = rs.getBLOB(1);
            OutputStream outstream = blob.getBinaryOutputStream();
            int bufferSize = blob.getChunkSize();
            byte[] buffer = new byte[bufferSize];
            int bytesRead = -1;
            while ((bytesRead = instream.read(buffer)) != -1) {
                outstream.write(buffer, 0, bytesRead);
            }
            instream.close();
            outstream.close();
            rs.close();
            stmt.close();
        } catch (SQLException e) {
            throw e;
        } catch (IOException e) {
            throw e;
        } finally {
            conn.setAutoCommit(oldAutoCommit);

        }

    }


    public static void down(String downFilepath) {
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
//            Connection con = DriverManager.getConnection(
//                    "jdbc:oracle:thin:@10.53.20.58:1521:orcl", "longey", "123456");
            Connection con = DriverManager.getConnection(
                    "jdbc:oracle:thin:@10.0.13.21:1521:devdb", "pci", "pci");
            PreparedStatement ps = con.prepareStatement(
                    "insert into Student values(?, ?,?)");

            down(con,"Student","picture","name","张三",downFilepath);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void down(Connection conn,
                                  String table,
                                  String blobColumn,
                                  String keyColumn,
                                  String keyValue,String fPath)
            throws SQLException, IOException {
        Statement stmt = null;
        OracleResultSet rs = null;
        BLOB blob = null;
        boolean oldAutoCommit = conn.getAutoCommit();
        StringBuffer sqlBuffer = new StringBuffer();
        try {
            conn.setAutoCommit(false);
            sqlBuffer.append("select ");
            sqlBuffer.append(blobColumn);
            sqlBuffer.append(" from ");
            sqlBuffer.append(table);
            sqlBuffer.append(" where ");
            sqlBuffer.append(keyColumn);
            sqlBuffer.append(" ='");
            sqlBuffer.append(keyValue);
//注意这里的"for update"
            sqlBuffer.append("' ");
//            sqlBuffer.append("' for update ");
            stmt = conn.createStatement();
            rs = (OracleResultSet) stmt.executeQuery(sqlBuffer.toString());

            if (!rs.next()) {
                rs.close();
                stmt.close();
                throw new IllegalArgumentException(
                        "no record found for keyValue： ‘" + keyValue + "’");
            }
            blob = rs.getBLOB(1);
            InputStream inputStream = blob.getBinaryStream();
            File f = new File(fPath);
            f.createNewFile();
            OutputStream out = new FileOutputStream(f);
            int bufferSize = blob.getChunkSize();
            byte[] buffer = new byte[1*1024*1024];
            int bytesRead = -1;
            int i= 1;
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                System.out.println(i++);
                out.write(buffer, 0, bytesRead);
            }
            inputStream.close();
            out.close();
            rs.close();
            stmt.close();
        } catch (SQLException e) {
            throw e;
        } catch (IOException e) {
            throw e;
        } finally {
            conn.setAutoCommit(oldAutoCommit);

        }

    }
}