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annotate flys-aft/src/main/java/de/intevation/db/ConnectedStatements.java @ 4630:63368dcc3f94

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Moved MovingAverage into math package
author Sascha L. Teichmann <teichmann@intevation.de>
date Mon, 03 Dec 2012 18:44:48 +0100
parents aad1886ea226
children b195fede1c3b
rev   line source
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100c4e0a45e1 Improved infrastructure for prepared statements.
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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