Mercurial > dive4elements > river
annotate etl/src/main/java/org/dive4elements/river/etl/db/ConnectedStatements.java @ 6952:e6a8255d0764
SedimentLoad: Allow to set range of total load.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Fri, 30 Aug 2013 12:32:29 +0200 |
parents | 6f80d5f375fd |
children | 0a5239a1e46e |
rev | line source |
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.etl.db; |
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10 |
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11 import java.sql.Connection; |
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12 import java.sql.DatabaseMetaData; |
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13 import java.sql.SQLException; |
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14 import java.sql.Savepoint; |
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15 |
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16 import java.util.ArrayDeque; |
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17 import java.util.Deque; |
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18 import java.util.HashMap; |
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19 import java.util.Map; |
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20 |
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21 import org.apache.log4j.Logger; |
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22 |
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23 public class ConnectedStatements |
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24 { |
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25 private static Logger log = Logger.getLogger(ConnectedStatements.class); |
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26 |
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27 protected Connection connection; |
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28 |
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29 protected Map<String, SymbolicStatement> statements; |
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30 |
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31 protected Map<String, SymbolicStatement.Instance> boundStatements; |
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32 |
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33 protected Deque<Savepoint> savepoints; |
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34 |
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35 public ConnectedStatements( |
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36 Connection connection, |
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37 Map<String, SymbolicStatement> statements |
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38 ) |
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39 throws SQLException |
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40 { |
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41 this.connection = connection; |
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42 this.statements = statements; |
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43 checkSavePoints(); |
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44 |
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45 boundStatements = new HashMap<String, SymbolicStatement.Instance>(); |
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46 } |
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47 |
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48 protected void checkSavePoints() throws SQLException { |
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49 DatabaseMetaData metaData = connection.getMetaData(); |
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50 if (metaData.supportsSavepoints()) { |
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51 log.info("Driver '" + metaData.getDriverName() + |
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52 "' does support savepoints."); |
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53 savepoints = new ArrayDeque<Savepoint>(); |
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54 } |
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55 else { |
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56 log.info("Driver '" + metaData.getDriverName() + |
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57 "' does not support savepoints."); |
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58 } |
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59 } |
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60 |
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61 public SymbolicStatement.Instance getStatement(String key) |
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62 throws SQLException |
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63 { |
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64 SymbolicStatement.Instance stmnt = boundStatements.get(key); |
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65 if (stmnt != null) { |
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66 return stmnt; |
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67 } |
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68 |
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69 SymbolicStatement ss = statements.get(key); |
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70 if (ss == null) { |
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71 return null; |
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72 } |
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73 |
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74 stmnt = ss.new Instance(connection); |
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75 boundStatements.put(key, stmnt); |
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76 return stmnt; |
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77 } |
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78 |
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79 public void beginTransaction() throws SQLException { |
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80 if (savepoints != null) { |
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81 savepoints.push(connection.setSavepoint()); |
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82 } |
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83 } |
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84 |
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85 public void commitTransaction() throws SQLException { |
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86 if (savepoints != null) { |
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87 savepoints.pop(); |
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88 } |
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89 connection.commit(); |
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90 } |
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91 |
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92 public void rollbackTransaction() throws SQLException { |
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93 if (savepoints != null) { |
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94 Savepoint savepoint = savepoints.pop(); |
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95 connection.rollback(savepoint); |
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96 } |
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97 else { |
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98 connection.rollback(); |
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99 } |
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100 } |
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101 |
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102 public void close() { |
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103 for (SymbolicStatement.Instance s: boundStatements.values()) { |
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104 s.close(); |
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105 } |
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106 |
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107 try { |
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108 if (savepoints != null && !savepoints.isEmpty()) { |
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109 Savepoint savepoint = savepoints.peekFirst(); |
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110 connection.rollback(savepoint); |
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111 } |
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112 connection.close(); |
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113 } |
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114 catch (SQLException sqle) { |
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115 } |
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116 } |
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117 } |
100c4e0a45e1
Improved infrastructure for prepared statements.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
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118 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |