Examples of org.postgresql.largeobject.LargeObject

org.postgresql.largeobject.LargeObject
This class provides the basic methods required to run the interface, plus a pair of methods that provide InputStream and OutputStream classes for this object.
Normally, client code would use the getAsciiStream, getBinaryStream, or getUnicodeStream methods in ResultSet, or setAsciiStream, setBinaryStream, or setUnicodeStream methods in PreparedStatement to access Large Objects.
However, sometimes lower level access to Large Objects are required, that are not supported by the JDBC specification.
Refer to org.postgresql.largeobject.LargeObjectManager on how to gain access to a Large Object, or how to create one. @see org.postgresql.largeobject.LargeObjectManager @see java.sql.ResultSet#getAsciiStream @see java.sql.ResultSet#getBinaryStream @see java.sql.ResultSet#getUnicodeStream @see java.sql.PreparedStatement#setAsciiStream @see java.sql.PreparedStatement#setBinaryStream @see java.sql.PreparedStatement#setUnicodeStream

        DelegatingConnection conn = (DelegatingConnection)store
            .getConnection();
        conn.setAutoCommit(false);
        LargeObjectManager lom = getLargeObjectManager(conn);
        if (rs.getInt(column) != -1) {
            LargeObject lo = lom.open(rs.getInt(column));
            return lo.getInputStream();
        } else {
            return null;
        }
    }

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                conn.setAutoCommit(false);
                LargeObjectManager lom = getLargeObjectManager(conn);
                // The create method is valid in versions previous to 8.3
                // in 8.3 this method is deprecated, use createLO
                int oid = lom.create();
                LargeObject lo = lom.open(oid, LargeObjectManager.WRITE);
                OutputStream os = lo.getOutputStream();
                copy((InputStream)ob, os);
                lo.close();
                row.setInt(col, oid);
            } catch (IOException ioe) {
                throw new StoreException(ioe);
            } finally {
                conn.close();

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            int oid = res.getInt(1);
            if (oid != -1) {
                conn.setAutoCommit(false);
                LargeObjectManager lom = getLargeObjectManager(conn);
                if (ob != null) {
                    LargeObject lo = lom.open(oid, LargeObjectManager.WRITE);
                    OutputStream os = lo.getOutputStream();
                    long size = copy((InputStream) ob, os);
                    lo.truncate((int) size);
                    lo.close();
                } else {
                    lom.delete(oid);
                    row.setInt(col, -1);
                }
            } else {
                if (ob != null) {
                    conn.setAutoCommit(false);
                    LargeObjectManager lom = getLargeObjectManager(conn);
                    oid = lom.create();
                    LargeObject lo = lom.open(oid, LargeObjectManager.WRITE);
                    OutputStream os = lo.getOutputStream();
                    copy((InputStream)ob, os);
                    lo.close();
                    row.setInt(col, oid);
                }
            }


        } catch (IOException ioe) {

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            lo.close();
            lo = null;
        }
        Iterator i = subLOs.iterator();
        while (i.hasNext()) {
            LargeObject subLO = (LargeObject)i.next();
            subLO.close();
        }
        subLOs = null;
    }

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    public synchronized InputStream getBinaryStream() throws SQLException
    {
        checkFreed();
        LargeObject subLO = lo.copy();
        subLOs.add(subLO);
        subLO.seek(0, LargeObject.SEEK_SET);
        return subLO.getInputStream();
    }

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    }


    public synchronized OutputStream setBinaryStream(long pos) throws SQLException
    {
        assertPosition(pos);
        LargeObject subLO = lo.copy();
        subLOs.add(subLO);
        subLO.seek((int)(pos-1));
        return subLO.getOutputStream();
    }

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        DelegatingConnection conn = (DelegatingConnection)store
            .getConnection();
        conn.setAutoCommit(false);
        LargeObjectManager lom = getLargeObjectManager(conn);
        if (rs.getInt(column) != -1) {
            LargeObject lo = lom.open(rs.getInt(column));
            return lo.getInputStream();
        } else {
            return null;
        }
    }

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                conn.setAutoCommit(false);
                LargeObjectManager lom = getLargeObjectManager(conn);
                // The create method is valid in versions previous to 8.3
                // in 8.3 this method is deprecated, use createLO
                int oid = lom.create();
                LargeObject lo = lom.open(oid, LargeObjectManager.WRITE);
                OutputStream os = lo.getOutputStream();
                copy((InputStream)ob, os);
                lo.close();
                row.setInt(col, oid);
            } catch (IOException ioe) {
                throw new StoreException(ioe);
            } finally {
                conn.close();

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            int oid = res.getInt(1);
            if (oid != -1) {
                conn.setAutoCommit(false);
                LargeObjectManager lom = getLargeObjectManager(conn);
                if (ob != null) {
                    LargeObject lo = lom.open(oid, LargeObjectManager.WRITE);
                    OutputStream os = lo.getOutputStream();
                    long size = copy((InputStream) ob, os);
                    lo.truncate((int) size);
                    lo.close();
                } else {
                    lom.delete(oid);
                    row.setInt(col, -1);
                }
            } else {
                if (ob != null) {
                    conn.setAutoCommit(false);
                    LargeObjectManager lom = getLargeObjectManager(conn);
                    oid = lom.create();
                    LargeObject lo = lom.open(oid, LargeObjectManager.WRITE);
                    OutputStream os = lo.getOutputStream();
                    copy((InputStream)ob, os);
                    lo.close();
                    row.setInt(col, oid);
                }
            }


        } catch (IOException ioe) {

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        DelegatingConnection conn = (DelegatingConnection)store
            .getConnection();
        conn.setAutoCommit(false);
        LargeObjectManager lom = getLargeObjectManager(conn);
        if (rs.getInt(column) != -1) {
            LargeObject lo = lom.open(rs.getInt(column));
            return lo.getInputStream();
        } else {
            return null;
        }
    }

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