Example usage for java.sql Blob length

Introduction

In this page you can find the example usage for java.sql Blob length.

Prototype

long length() throws SQLException;

Source Link

Document

Returns the number of bytes in the BLOB value designated by this Blob object.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    String driverName = "com.jnetdirect.jsql.JSQLDriver";
    Class.forName(driverName);/* w ww  . j  a  v a2 s.co m*/

    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);//from  w  w  w  .  j  a  va  2s . co  m

    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();
}

---

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 www. j a  va 2s. c o m*/

    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();
}

---

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;//  www .  j  a  v  a2 s.co m
    }
    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();
    }
}

---

From source file:Main.java

public static byte[] getBLOB(int id, Connection conn) throws Exception {
    ResultSet rs = null;/*w w  w .j  a  v a 2  s  . com*/
    PreparedStatement pstmt = null;
    String query = "SELECT photo FROM MyPictures WHERE id = ?";
    try {
        pstmt = conn.prepareStatement(query);
        pstmt.setInt(1, id);
        rs = pstmt.executeQuery();
        rs.next();
        Blob blob = rs.getBlob(3);
        // materialize BLOB onto client
        return blob.getBytes(1, (int) blob.length());
    } finally {
        rs.close();
        pstmt.close();
        conn.close();
    }
}

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From source file:Main.java

public static byte[] getBLOB(int id, Connection conn) throws Exception {
    ResultSet rs = null;/*from   w  ww .  ja  va2  s. c  om*/
    PreparedStatement pstmt = null;
    String query = "SELECT photo FROM MyPictures WHERE id = ?";
    try {
        pstmt = conn.prepareStatement(query);
        pstmt.setInt(1, id);
        rs = pstmt.executeQuery();
        rs.next();
        Blob blob = rs.getBlob("photo");
        // materialize BLOB onto client
        return blob.getBytes(1, (int) blob.length());
    } finally {
        rs.close();
        pstmt.close();
        conn.close();
    }
}

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From source file:com.espertech.esperio.db.core.DBUtil.java

private static byte[] getBlobValue(Blob blob) throws SQLException {
    if (blob == null) {
        return null;
    }//w ww . j  a  v  a  2 s. c o  m

    if (blob.length() > Integer.MAX_VALUE) {
        log.warn("Blob truncated: value larger then Integer.MAX_VALUE bytes:" + blob.length());
        return null;
    }
    int len = (int) blob.length();
    return blob.getBytes(1, len);
}

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From source file:com.webbfontaine.valuewebb.irms.impl.data.AttachedDocDataSource.java

private static InputStream stream(Blob data) throws SQLException {
    if (data != null) {
        LOGGER.debug("Attached doc LOB data length: {}", data.length());
        return data.getBinaryStream();
    }//from  w ww .java2 s  .  c  o m

    return null;
}

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From source file:procuradoria.pdf.util.DocumentsPdf.java

public static void byteArrayToFile(Uzatdocs doc) {
    try {//  w w  w .  ja v a 2  s  . c  o  m
        Blob blob = doc.getUzatdocsArchivo();

        int blobLength = (int) blob.length();
        byte[] bArray = blob.getBytes(1, blobLength);
        blob.free();
        OutputStream out = new FileOutputStream("out.pdf");
        out.write(bArray);
        out.close();
    } catch (Exception ex) {
        log.level.info(">> Exception " + ex.getMessage());
    }
}

---

From source file:procuradoria.pdf.util.DocumentsPdf.java

public static Boolean CreateFilePDF(Uzatdocs document, String filePath) {
    Boolean exito = false;/*from  w w w.  j a va 2 s. com*/
    try {
        String fileName = document.getId().getUzatdocsId() + ".pdf";
        Blob blob = document.getUzatdocsArchivo();
        int blobLength = (int) blob.length();
        byte[] bArray = blob.getBytes(1, blobLength);
        OutputStream out = new FileOutputStream(filePath + fileName);
        out.write(bArray);
        out.close();
        exito = true;
    } catch (Exception ex) {
        log.level.info(">> Exception " + ex.getMessage());
    }
    return exito;
}

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