Example usage for java.sql ResultSet getBlob

Introduction

In this page you can find the example usage for java.sql ResultSet getBlob.

Prototype

Blob getBlob(String columnLabel) throws SQLException;

Source Link

Document

Retrieves the value of the designated column in the current row of this ResultSet object as a Blob object in the Java programming language.

Usage

From source file:EmployeeShow.java

public static void main(String[] args) throws Exception {
    ImageIcon image;/*from   w  ww  . ja  va 2 s .  c o m*/

    Connection con = DriverManager.getConnection("jdbc:derby://localhost:1527/c:\\employee");

    Statement s = con.createStatement();
    ResultSet rs = s.executeQuery("select photo from employee where name = 'Duke'");
    if (rs.next()) {
        Blob photo = rs.getBlob(1);
        ObjectInputStream ois = null;
        ois = new ObjectInputStream(photo.getBinaryStream());
        image = (ImageIcon) ois.readObject();
    }
    s.close();
}

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From source file:Main.java

public static void main(String[] argv) throws Exception {
    String driverName = "com.jnetdirect.jsql.JSQLDriver";
    Class.forName(driverName);/*  ww w  .  ja v  a 2  s . com*/

    String serverName = "127.0.0.1";
    String portNumber = "1433";
    String mydatabase = serverName + ":" + portNumber;
    String url = "jdbc:JSQLConnect://" + mydatabase;
    String username = "username";
    String password = "password";

    Connection connection = DriverManager.getConnection(url, username, password);
    Statement stmt = connection.createStatement();
    ResultSet rs = stmt.executeQuery("SELECT col_blob FROM mysql_all_table");

    if (rs.next()) {
        Blob blob = rs.getBlob("col_blob");
        long blobLength = blob.length();

        int pos = 1; // position is 1-based
        int len = 10;
        byte[] bytes = blob.getBytes(pos, len);

        InputStream is = blob.getBinaryStream();
        int b = is.read();
    }
}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

    Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ORCL", "yourName", "mypwd");

    Statement stmt = conn.createStatement();

    createBlobClobTables(stmt);//www . ja va2 s.c om

    PreparedStatement pstmt = conn.prepareStatement("INSERT INTO BlobClob VALUES(40,?,?)");

    File file = new File("blob.txt");
    FileInputStream fis = new FileInputStream(file);
    pstmt.setBinaryStream(1, fis, (int) file.length());

    file = new File("clob.txt");
    fis = new FileInputStream(file);
    pstmt.setAsciiStream(2, fis, (int) file.length());
    fis.close();

    pstmt.execute();

    ResultSet rs = stmt.executeQuery("SELECT * FROM BlobClob WHERE id = 40");
    rs.next();

    java.sql.Blob blob = rs.getBlob(2);
    java.sql.Clob clob = rs.getClob(3);

    byte blobVal[] = new byte[(int) blob.length()];
    InputStream blobIs = blob.getBinaryStream();
    blobIs.read(blobVal);
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    bos.write(blobVal);
    blobIs.close();

    char clobVal[] = new char[(int) clob.length()];
    Reader r = clob.getCharacterStream();
    r.read(clobVal);
    StringWriter sw = new StringWriter();
    sw.write(clobVal);

    r.close();
    conn.close();
}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

    Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ORCL", "yourName", "mypwd");

    Statement stmt = conn.createStatement();

    createBlobClobTables(stmt);//from  ww w  .  j a va 2s.  com

    PreparedStatement pstmt = conn.prepareStatement("INSERT INTO BlobClob VALUES(40,?,?)");

    File file = new File("blob.txt");
    FileInputStream fis = new FileInputStream(file);
    pstmt.setBinaryStream(1, fis, (int) file.length());

    file = new File("clob.txt");
    fis = new FileInputStream(file);
    pstmt.setAsciiStream(2, fis, (int) file.length());
    fis.close();

    pstmt.execute();

    ResultSet rs = stmt.executeQuery("SELECT * FROM BlobClob WHERE id = 40");
    rs.next();

    java.sql.Blob blob = rs.getBlob(2);
    java.sql.Clob clob = rs.getClob("myClobColumn");

    byte blobVal[] = new byte[(int) blob.length()];
    InputStream blobIs = blob.getBinaryStream();
    blobIs.read(blobVal);
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    bos.write(blobVal);
    blobIs.close();

    char clobVal[] = new char[(int) clob.length()];
    Reader r = clob.getCharacterStream();
    r.read(clobVal);
    StringWriter sw = new StringWriter();
    sw.write(clobVal);

    r.close();
    conn.close();
}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    String WRITE_OBJECT_SQL = "BEGIN " + "  INSERT INTO java_objects(object_id, object_name, object_value) "
            + "  VALUES (?, ?, empty_blob()) " + "  RETURN object_value INTO ?; " + "END;";
    String READ_OBJECT_SQL = "SELECT object_value FROM java_objects WHERE object_id = ?";

    Connection conn = getOracleConnection();
    conn.setAutoCommit(false);// w w  w . j a va  2 s.  c om
    List<Object> list = new ArrayList<Object>();
    list.add("This is a short string.");
    list.add(new Integer(1234));
    list.add(new java.util.Date());

    // write object to Oracle
    long id = 0001;
    String className = list.getClass().getName();
    CallableStatement cstmt = conn.prepareCall(WRITE_OBJECT_SQL);

    cstmt.setLong(1, id);
    cstmt.setString(2, className);

    cstmt.registerOutParameter(3, java.sql.Types.BLOB);

    cstmt.executeUpdate();
    BLOB blob = (BLOB) cstmt.getBlob(3);
    OutputStream os = blob.getBinaryOutputStream();
    ObjectOutputStream oop = new ObjectOutputStream(os);
    oop.writeObject(list);
    oop.flush();
    oop.close();
    os.close();

    // Read object from oracle
    PreparedStatement pstmt = conn.prepareStatement(READ_OBJECT_SQL);
    pstmt.setLong(1, id);
    ResultSet rs = pstmt.executeQuery();
    rs.next();
    InputStream is = rs.getBlob(1).getBinaryStream();
    ObjectInputStream oip = new ObjectInputStream(is);
    Object object = oip.readObject();
    className = object.getClass().getName();
    oip.close();
    is.close();
    rs.close();
    pstmt.close();
    conn.commit();

    // de-serialize list a java object from a given objectID
    List listFromDatabase = (List) object;
    System.out.println("[After De-Serialization] list=" + listFromDatabase);
    conn.close();
}

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From source file:DemoPreparedStatementSetBlob.java

public static void main(String[] args) throws Exception {
    Connection conn = null;/*  ww  w  . j av a 2s  .c  o  m*/
    PreparedStatement pstmt = null;
    ResultSet rs = null;
    java.sql.Blob blob = null;
    try {
        conn = getConnection();
        // prepare blob object from an existing binary column
        pstmt = conn.prepareStatement("select photo from my_pictures where id = ?");
        pstmt.setString(1, "0001");
        rs = pstmt.executeQuery();
        rs.next();
        blob = rs.getBlob(1);

        // prepare SQL query for inserting a new row using setBlob()
        String query = "insert into blob_table(id, blob_column) values(?, ?)";
        // begin transaction
        conn.setAutoCommit(false);

        pstmt = conn.prepareStatement(query);
        pstmt.setString(1, "0002");
        pstmt.setBlob(2, blob);

        int rowCount = pstmt.executeUpdate();
        System.out.println("rowCount=" + rowCount);
        // end transaction
        conn.commit();
    } finally {
        rs.close();
        pstmt.close();
        conn.close();
    }
}

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From source file:DemoDisplayBlobFromDatabase.java

public static void main(String args[]) throws Exception {
    Connection conn = null;/*from   w w w .  j a  v a 2 s.c om*/
    ResultSet rs = null;
    PreparedStatement pstmt = null;
    String query = "SELECT blob_column FROM blob_table WHERE id = ?";

    try {
        conn = getConnection();
        pstmt = conn.prepareStatement(query);
        pstmt.setString(1, "0001");
        rs = pstmt.executeQuery();
        rs.next();
        // materialize binary data onto client
        java.sql.Blob blob = rs.getBlob(1);
    } finally {
        rs.close();
        pstmt.close();
        conn.close();
    }
}

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From source file:Blobs.java

public static void main(String args[]) {
    if (args.length != 1) {
        System.err.println("Syntax: <java Blobs [driver] [url] " + "[uid] [pass] [file]");
        return;/*from  ww  w .jav  a 2s  . c  om*/
    }
    try {
        Class.forName(args[0]).newInstance();
        Connection con = DriverManager.getConnection(args[1], args[2], args[3]);
        File f = new File(args[4]);
        PreparedStatement stmt;

        if (!f.exists()) {
            // if the file does not exist
            // retrieve it from the database and write it to the named file
            ResultSet rs;

            stmt = con.prepareStatement("SELECT blobData " + "FROM BlobTest " + "WHERE fileName = ?");

            stmt.setString(1, args[0]);
            rs = stmt.executeQuery();
            if (!rs.next()) {
                System.out.println("No such file stored.");
            } else {
                Blob b = rs.getBlob(1);
                BufferedOutputStream os;

                os = new BufferedOutputStream(new FileOutputStream(f));
                os.write(b.getBytes(0, (int) b.length()), 0, (int) b.length());
                os.flush();
                os.close();
            }
        } else {
            // otherwise read it and save it to the database
            FileInputStream fis = new FileInputStream(f);
            byte[] tmp = new byte[1024];
            byte[] data = null;
            int sz, len = 0;

            while ((sz = fis.read(tmp)) != -1) {
                if (data == null) {
                    len = sz;
                    data = tmp;
                } else {
                    byte[] narr;
                    int nlen;

                    nlen = len + sz;
                    narr = new byte[nlen];
                    System.arraycopy(data, 0, narr, 0, len);
                    System.arraycopy(tmp, 0, narr, len, sz);
                    data = narr;
                    len = nlen;
                }
            }
            if (len != data.length) {
                byte[] narr = new byte[len];

                System.arraycopy(data, 0, narr, 0, len);
                data = narr;
            }
            stmt = con.prepareStatement("INSERT INTO BlobTest(fileName, " + "blobData) VALUES(?, ?)");
            stmt.setString(1, args[0]);
            stmt.setObject(2, data);
            stmt.executeUpdate();
            f.delete();
        }
        con.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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From source file:com.plexobject.testplayer.dao.jdbc.GenericDaoJdbc.java

protected static Object getBlobObject(ResultSet rs, int n) throws SQLException {
    Blob blob = rs.getBlob(n);
    return toObject(blob);
}

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From source file:org.etudes.jforum.dao.oracle.OracleUtils.java

/**
 * The query should look like:/*from  ww w .  j av a 2 s  .c  o m*/
 * 
 * SELECT blob_field from any_table WHERE id = ? FOR UPDATE
 * 
 * BUT KEEP IN MIND:
 * 
 * When you insert record in previous step, it should go with empty_blob() like:
 * 
 * INSERT INTO jforum_posts_text ( post_text ) VALUES (EMPTY_BLOB())
 * 
 * @param query
 * @param idForQuery
 * @param value
 * @throws IOException
 * @throws SQLException
 */
public static void writeBlobUTF16BinaryStream(String query, int idForQuery, String value)
        throws IOException, SQLException {
    PreparedStatement p = JForum.getConnection().prepareStatement(query);
    p.setInt(1, idForQuery);

    ResultSet rs = p.executeQuery();
    rs.next();
    Blob postText = rs.getBlob(1);

    //wipe out the Blob contents 
    postText.truncate(0);

    if (logger.isDebugEnabled())
        logger.debug("post test is a " + postText.getClass().getName());

    // OutputStream blobWriter = ((oracle.sql.BLOB)postText).setBinaryStream(0L);
    OutputStream blobWriter = postText.setBinaryStream(0L);
    blobWriter.write(value.getBytes("UTF-16"));

    blobWriter.flush();
    blobWriter.close();
    rs.close();
    p.close();
}

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