Mercurial > dive4elements > river

annotate flys-aft/src/main/java/de/intevation/db/ConnectedStatements.java @ 4269:0c766c475805

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Add Panel and Tree UI classes for dispayling the measurement station info The new ui classes are using the new extracted base class InfoPanel and InfoTree which are in common with the gauge info.
author Björn Ricks <bjoern.ricks@intevation.de>
date Fri, 26 Oct 2012 12:22:06 +0200
parents aad1886ea226
children b195fede1c3b
rev   line source
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1 package de.intevation.db;
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2
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3 import java.util.HashMap;
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4 import java.util.Map;
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5 import java.util.Deque;
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6 import java.util.ArrayDeque;
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7
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8 import java.sql.Connection;
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9 import java.sql.SQLException;
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10 import java.sql.Savepoint;
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11 import java.sql.DatabaseMetaData;
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12
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13 import org.apache.log4j.Logger;
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14
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15 public class ConnectedStatements
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16 {
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17 private static Logger log = Logger.getLogger(ConnectedStatements.class);
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18
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19 protected Connection connection;
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20
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21 protected Map<String, SymbolicStatement> statements;
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22
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23 protected Map<String, SymbolicStatement.Instance> boundStatements;
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24
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25 protected Deque<Savepoint> savepoints;
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26
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27 public ConnectedStatements(
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28 Connection connection,
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29 Map<String, SymbolicStatement> statements
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30 )
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31 throws SQLException
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32 {
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33 this.connection = connection;
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34 this.statements = statements;
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35 checkSavePoints();
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36
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37 boundStatements = new HashMap<String, SymbolicStatement.Instance>();
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38 }
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39
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40 protected void checkSavePoints() throws SQLException {
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41 DatabaseMetaData metaData = connection.getMetaData();
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42 if (metaData.supportsSavepoints()) {
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43 log.info("Driver '" + metaData.getDriverName() +
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44 "' does support savepoints.");
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45 savepoints = new ArrayDeque<Savepoint>();
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46 }
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47 else {
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48 log.info("Driver '" + metaData.getDriverName() +
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49 "' does not support savepoints.");
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50 }
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51 }
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52
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53 public SymbolicStatement.Instance getStatement(String key)
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54 throws SQLException
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55 {
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56 SymbolicStatement.Instance stmnt = boundStatements.get(key);
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57 if (stmnt != null) {
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58 return stmnt;
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59 }
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60
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61 SymbolicStatement ss = statements.get(key);
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62 if (ss == null) {
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63 return null;
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64 }
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65
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66 stmnt = ss.new Instance(connection);
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67 boundStatements.put(key, stmnt);
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68 return stmnt;
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69 }
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70
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71 public void beginTransaction() throws SQLException {
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72 if (savepoints != null) {
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73 savepoints.push(connection.setSavepoint());
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74 }
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75 }
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76
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77 public void commitTransaction() throws SQLException {
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78 if (savepoints != null) {
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79 savepoints.pop();
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80 }
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81 connection.commit();
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82 }
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83
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84 public void rollbackTransaction() throws SQLException {
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85 if (savepoints != null) {
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86 Savepoint savepoint = savepoints.pop();
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87 connection.rollback(savepoint);
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88 }
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89 else {
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90 connection.rollback();
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91 }
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92 }
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93
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94 public void close() {
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95 for (SymbolicStatement.Instance s: boundStatements.values()) {
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96 s.close();
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97 }
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98
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99 try {
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100 if (savepoints != null && !savepoints.isEmpty()) {
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101 Savepoint savepoint = savepoints.peekFirst();
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102 connection.rollback(savepoint);
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103 }
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104 connection.close();
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105 }
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106 catch (SQLException sqle) {
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107 }
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108 }
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109 }
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110 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org