001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2009 SonarSource SA
004     * mailto:contact AT sonarsource DOT com
005     *
006     * Sonar is free software; you can redistribute it and/or
007     * modify it under the terms of the GNU Lesser General Public
008     * License as published by the Free Software Foundation; either
009     * version 3 of the License, or (at your option) any later version.
010     *
011     * Sonar is distributed in the hope that it will be useful,
012     * but WITHOUT ANY WARRANTY; without even the implied warranty of
013     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014     * Lesser General Public License for more details.
015     *
016     * You should have received a copy of the GNU Lesser General Public
017     * License along with Sonar; if not, write to the Free Software
018     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
019     */
020    package org.sonar.api.database;
021    
022    import java.sql.Connection;
023    import java.sql.ResultSet;
024    import java.sql.SQLException;
025    import java.sql.Statement;
026    import javax.persistence.*;
027    
028    @Entity
029    @Table(name = SchemaMigration.TABLE_NAME, uniqueConstraints = {@UniqueConstraint(columnNames = {"version"})})
030    public class SchemaMigration {
031    
032      public final static int VERSION_UNKNOWN = -1;
033      public static final int LAST_VERSION = 100;
034    
035      public final static String TABLE_NAME = "schema_migrations";
036    
037      @Id
038      @Column(name = "version", updatable = true)
039      private String version;
040    
041      public String getVersion() {
042        return version;
043      }
044    
045      public void setVersion(String s) {
046        this.version = s;
047      }
048    
049      public void setVersion(int i) {
050        this.version = String.valueOf(i);
051      }
052    
053      public static int getCurrentVersion(Connection connection) {
054        Statement stmt = null;
055        ResultSet rs = null;
056        int version = VERSION_UNKNOWN;
057        try {
058          stmt = connection.createStatement();
059          rs = stmt.executeQuery("SELECT version FROM " + SchemaMigration.TABLE_NAME);
060          while (rs.next()) {
061            int i = Integer.parseInt(rs.getString(1));
062            if (i > version) {
063              version = i;
064            }
065          }
066        } catch (SQLException e) {
067          // ignore
068        } finally {
069          close(rs);
070          close(stmt);
071        }
072    
073        return version;
074      }
075    
076      private static void close(ResultSet rs) {
077        if (rs != null) {
078          try {
079            rs.close();
080          } catch (SQLException e) {
081            // why does close() throw a checked-exception ???
082          }
083        }
084      }
085    
086      private static void close(Statement st) {
087        if (st != null) {
088          try {
089            st.close();
090          } catch (SQLException e) {
091            // why does close() throw a checked-exception ???
092          }
093        }
094      }
095    }