Mercurial > dive4elements > river
annotate flys-aft/src/main/java/de/intevation/db/ConnectedStatements.java @ 4834:601f9d69cc10
insert helpText links
author | Bettina Gruenbauer <bettina@intevation.de> |
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date | Tue, 22 Jan 2013 15:13:58 +0100 |
parents | f939e1e6cfa4 |
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1 package de.intevation.db; |
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2 |
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3 import java.sql.Connection; |
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4 import java.sql.DatabaseMetaData; |
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5 import java.sql.SQLException; |
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6 import java.sql.Savepoint; |
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7 |
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8 import java.util.ArrayDeque; |
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9 import java.util.Deque; |
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10 import java.util.HashMap; |
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11 import java.util.Map; |
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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 : |