tdscore.java

jtds的源码 是你学习java的好东西

                    case Driver.TDS80:
                    case Driver.TDS81:
                        executeSQL70(sql, procName, parameters, noMetaData, sendNow);
                        break;
                    default:
                        throw new IllegalStateException("Unknown TDS version " + tdsVersion);
                }

                if (sendNow) {
                    out.flush();
                    connectionLock.release();
                    connectionLock = null;
                    sendFailed = false;
                    endOfResponse = false;
                    endOfResults  = true;
                    wait(timeOut);
                } else {
                    sendFailed = false;
                }
            } catch (IOException ioe) {
                connection.setClosed();

                throw Support.linkException(
                    new SQLException(
                           Messages.get(
                                    "error.generic.ioerror", ioe.getMessage()),
                                        "08S01"), ioe);
            }
        } finally {
            if ((sendNow || sendFailed) && connectionLock != null) {
                connectionLock.release();
                connectionLock = null;
            }
            // Clear the in batch flag
            if (sendNow) {
                inBatch = false;
            }
        }
    }

    /**
     * Prepares the SQL for use with Microsoft server.
     *
     * @param sql                  the SQL statement to prepare.
     * @param params               the actual parameter list
     * @param needCursor           true if a cursorprepare is required
     * @param resultSetType        value of the resultSetType parameter when
     *                             the Statement was created
     * @param resultSetConcurrency value of the resultSetConcurrency parameter
     *                             whenthe Statement was created
     * @return name of the procedure or prepared statement handle.
     * @exception SQLException
     */
    String microsoftPrepare(String sql,
                            ParamInfo[] params,
                            boolean needCursor,
                            int resultSetType,
                            int resultSetConcurrency)
            throws SQLException {
        //
        checkOpen();
        messages.clearWarnings();

        int prepareSql = connection.getPrepareSql();

        if (prepareSql == TEMPORARY_STORED_PROCEDURES) {
            StringBuffer spSql = new StringBuffer(sql.length() + 32 + params.length * 15);
            String procName = connection.getProcName();

            spSql.append("create proc ");
            spSql.append(procName);
            spSql.append(' ');

            for (int i = 0; i < params.length; i++) {
                spSql.append("@P");
                spSql.append(i);
                spSql.append(' ');
                spSql.append(params[i].sqlType);

                if (i + 1 < params.length) {
                    spSql.append(',');
                }
            }

            // continue building proc
            spSql.append(" as ");
            spSql.append(Support.substituteParamMarkers(sql, params));

            try {
                submitSQL(spSql.toString());
                return procName;
            } catch (SQLException e) {
                if ("08S01".equals(e.getSQLState())) {
                    // Serious (I/O) error, rethrow
                    throw e;
                }

                // This exception probably caused by failure to prepare
                // Add a warning
                messages.addWarning(Support.linkException(
                        new SQLWarning(
                                Messages.get("error.prepare.prepfailed",
                                        e.getMessage()),
                                e.getSQLState(), e.getErrorCode()),
                        e));
            }

        } else if (prepareSql == PREPARE) {
            int scrollOpt, ccOpt;

            ParamInfo prepParam[] = new ParamInfo[needCursor ? 6 : 4];

            // Setup prepare handle param
            prepParam[0] = new ParamInfo(Types.INTEGER, null, ParamInfo.OUTPUT);

            // Setup parameter descriptor param
            prepParam[1] = new ParamInfo(Types.LONGVARCHAR,
                    Support.getParameterDefinitions(params),
                    ParamInfo.UNICODE);

            // Setup sql statemement param
            prepParam[2] = new ParamInfo(Types.LONGVARCHAR,
                    Support.substituteParamMarkers(sql, params),
                    ParamInfo.UNICODE);

            // Setup options param
            prepParam[3] = new ParamInfo(Types.INTEGER, new Integer(1), ParamInfo.INPUT);

            if (needCursor) {
                // Select the correct type of Server side cursor to
                // match the scroll and concurrency options.
                scrollOpt = MSCursorResultSet.getCursorScrollOpt(resultSetType,
                        resultSetConcurrency, true);
                ccOpt = MSCursorResultSet.getCursorConcurrencyOpt(resultSetConcurrency);

                // Setup scroll options parameter
                prepParam[4] = new ParamInfo(Types.INTEGER,
                        new Integer(scrollOpt),
                        ParamInfo.OUTPUT);

                // Setup concurrency options parameter
                prepParam[5] = new ParamInfo(Types.INTEGER,
                        new Integer(ccOpt),
                        ParamInfo.OUTPUT);
            }

            columns = null; // Will be populated if preparing a select
            try {
                executeSQL(null, needCursor ? "sp_cursorprepare" : "sp_prepare",
                        prepParam, false, 0, -1, -1, true);

                int resultCount = 0;
                while (!endOfResponse) {
                    nextToken();
                    if (isResultSet()) {
                        resultCount++;
                    }
                }
                // columns will now hold meta data for any select statements
                if (resultCount != 1) {
                    // More than one result set was returned or none
                    // therefore metadata not available or unsafe.
                    columns = null;
                }
                Integer prepareHandle = (Integer) prepParam[0].getOutValue();
                if (prepareHandle != null) {
                    return prepareHandle.toString();
                }
                // Probably an exception occured, check for it
                messages.checkErrors();
            } catch (SQLException e) {
                if ("08S01".equals(e.getSQLState())) {
                    // Serious (I/O) error, rethrow
                    throw e;
                }
                // This exception probably caused by failure to prepare
                // Add a warning
                messages.addWarning(Support.linkException(
                        new SQLWarning(
                                Messages.get("error.prepare.prepfailed",
                                        e.getMessage()),
                                e.getSQLState(), e.getErrorCode()),
                        e));
            }
        }

        return null;
    }

    /**
     * Creates a light weight stored procedure on a Sybase server.
     *
     * @param sql    SQL statement to prepare
     * @param params the actual parameter list
     * @return name of the procedure
     * @throws SQLException if an error occurs
     */
    synchronized String sybasePrepare(String sql, ParamInfo[] params)
            throws SQLException {
        checkOpen();
        messages.clearWarnings();
        if (sql == null || sql.length() == 0) {
            throw new IllegalArgumentException(
                    "sql parameter must be at least 1 character long.");
        }

        String procName = connection.getProcName();

        if (procName == null || procName.length() != 11) {
            throw new IllegalArgumentException(
                    "procName parameter must be 11 characters long.");
        }

        // TODO Check if output parameters are handled ok
        // Check no text/image parameters
        for (int i = 0; i < params.length; i++) {
            if ("text".equals(params[i].sqlType)
                || "unitext".equals(params[i].sqlType)
                || "image".equals(params[i].sqlType)) {
                return null; // Sadly no way
            }
        }

        Semaphore mutex = null;

        try {
            mutex = connection.getMutex();

            out.setPacketType(SYBQUERY_PKT);
            out.write((byte)TDS5_DYNAMIC_TOKEN);

            byte buf[] = Support.encodeString(connection.getCharset(), sql);

            out.write((short) (buf.length + 41));
            out.write((byte) 1);
            out.write((byte) 0);
            out.write((byte) 10);
            out.writeAscii(procName.substring(1));
            out.write((short) (buf.length + 26));
            out.writeAscii("create proc ");
            out.writeAscii(procName.substring(1));
            out.writeAscii(" as ");
            out.write(buf);
            out.flush();
            endOfResponse = false;
            clearResponseQueue();
            messages.checkErrors();
            return procName;
        } catch (IOException ioe) {
            connection.setClosed();
            throw Support.linkException(
                new SQLException(
                       Messages.get(
                                "error.generic.ioerror", ioe.getMessage()),
                                    "08S01"), ioe);
        } catch (SQLException e) {
            if ("08S01".equals(e.getSQLState())) {
                // Serious error rethrow
                throw e;
            }

            // This exception probably caused by failure to prepare
            // Return null;
            return null;
        } finally {
            if (mutex != null) {
                mutex.release();
            }
        }
    }

    /**
     * Drops a Sybase temporary stored procedure.
     *
     * @param procName the temporary procedure name
     * @throws SQLException if an error occurs
     */
    synchronized void sybaseUnPrepare(String procName)
            throws SQLException {
        checkOpen();
        messages.clearWarnings();

        if (procName == null || procName.length() != 11) {
            throw new IllegalArgumentException(
                    "procName parameter must be 11 characters long.");
        }

        Semaphore mutex = null;
        try {
            mutex = connection.getMutex();

            out.setPacketType(SYBQUERY_PKT);
            out.write((byte)TDS5_DYNAMIC_TOKEN);
            out.write((short) (15));
            out.write((byte) 4);
            out.write((byte) 0);
            out.write((byte) 10);
            out.writeAscii(procName.substring(1));
            out.write((short)0);
            out.flush();
            endOfResponse = false;
            clearResponseQueue();
            messages.checkErrors();
        } catch (IOException ioe) {
            connection.setClosed();
            throw Support.linkException(
                new SQLException(
                       Messages.get(
                                "error.generic.ioerror", ioe.getMessage()),
                                    "08S01"), ioe);
        } catch (SQLException e) {
            if ("08S01".equals(e.getSQLState())) {
                // Serious error rethrow
                throw e;
            }
            // This exception probably caused by failure to unprepare
        } finally {
            if (mutex != null) {
                mutex.release();
            }
        }
    }

    /**
     * Enlist the current connection in a distributed transaction or request the location of the
     * MSDTC instance controlling the server we are connected to.
     *
     * @param type      set to 0 to request TM address or 1 to enlist connection
     * @param oleTranID the 40 OLE transaction ID
     * @return a <code>byte[]</code> array containing the TM address data
     * @throws SQLException
     */
    synchronized byte[] enlistConnection(int type, byte[] oleTranID) throws SQLException {
        Semaphore mutex = null;
        try {
            mutex = connection.getMutex();

            out.setPacketType(MSDTC_PKT);
            out.write((short)type);
            switch (type) {
                case 0: // Get result set with location of MSTDC
                    out.write((short)0);
                    break;