int rows = 0;
FileInputStream fin = null;
ResultSet rslt = null;
Statement stmt = null;
PreparedStatement pstmt = null;
Blob photo = null;
long person_id = 0;
try {
conn.setAutoCommit(false);
// get Tim's person_id
stmt = conn.createStatement();
rslt = stmt.executeQuery(
"select person_id " +
"from person " +
"where last_name = 'O''Reilly' " +
"and first_name = 'Tim'");
while (rslt.next()) {
rows++;
person_id = rslt.getLong(1);
}
if (rows > 1) {
System.err.println("Too many rows!");
System.exit(1);
}
else if (rows == 0) {
System.err.println("Not found!");
System.exit(1);
}
rslt.close();
rslt = null;
// delete an existing row
rows = stmt.executeUpdate(
"delete person_information " +
"where person_id = " + Long.toString( person_id ));
System.out.println(rows + " rows deleted");
// insert a new rows creating empty locators
rows = stmt.executeUpdate(
"insert into person_information " +
"( person_id, biography, photo ) " +
"values " +
"( " + Long.toString( person_id ) + ", empty_clob(), empty_blob() )");
System.out.println(rows + " rows inserted");
// retrieve and lock the Blob locator for photo
rslt = stmt.executeQuery(
"select photo " +
"from person_information " +
"where person_id = " + Long.toString( person_id ) + " " +
"for update nowait");
rslt.next();
photo = rslt.getBlob(1);
rslt.close();
rslt = null;
stmt.close();
stmt = null;
// set up the update statement
pstmt = conn.prepareStatement(
"update person_information " +
"set photo = ? " +
"where person_id = ?");
// copy the entire contents of the file to a buffer
File binaryFile = new File("tim.gif");
long fileLength = binaryFile.length();
fin = new FileInputStream(binaryFile);
byte[] buffer = new byte[(int)fileLength];
fin.read(buffer);
fin.close();
pstmt.setObject(1, buffer);
pstmt.setLong(2, person_id);
rows = pstmt.executeUpdate();
System.out.println(rows + " rows updated");
conn.commit();
pstmt.close();
pstmt = null;
}
catch (SQLException e) {
System.err.println("SQL Error: " + e.getMessage());
}
catch (IOException e) {
System.err.println("IO Error: " + e.getMessage());
}
finally {
if (rslt != null)
try { rslt.close(); } catch (SQLException ignore) { }
if (stmt != null)
try { stmt.close(); } catch (SQLException ignore) { }
if (pstmt != null)
try { pstmt.close(); } catch (SQLException ignore) { }
}
