001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2008-2011 SonarSource
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.jpa.entity;
021    
022    import org.apache.commons.lang.builder.ReflectionToStringBuilder;
023    import org.apache.commons.lang.builder.ToStringStyle;
024    
025    import javax.persistence.*;
026    import java.sql.Connection;
027    import java.sql.ResultSet;
028    import java.sql.SQLException;
029    import java.sql.Statement;
030    
031    @Entity
032    @Table(name = SchemaMigration.TABLE_NAME, uniqueConstraints = {@UniqueConstraint(columnNames = {"version"})})
033    public class SchemaMigration {
034    
035      public final static int VERSION_UNKNOWN = -1;
036    
037      /*
038    
039       IMPORTANT : HOW TO ADD A DATABASE MIGRATION :
040          - set the following constant LAST_VERSION
041          - add the activerecord migration script into sonar-server/src/main/webapp/WEB-INF/db/migrate
042          - complete the Derby DDL file used for unit tests : sonar-testing-harness/src/main/resources/org/sonar/test/persistence/sonar-test.ddl
043    
044       */
045      public static final int LAST_VERSION = 222;
046    
047      public final static String TABLE_NAME = "schema_migrations";
048    
049      @Id
050      @Column(name = "version", updatable = true)
051      private String version;
052    
053      public String getVersion() {
054        return version;
055      }
056    
057      public void setVersion(String s) {
058        this.version = s;
059      }
060    
061      public void setVersion(int i) {
062        this.version = String.valueOf(i);
063      }
064    
065      public static int getCurrentVersion(Connection connection) {
066        Statement stmt = null;
067        ResultSet rs = null;
068        int version = VERSION_UNKNOWN;
069        try {
070          stmt = connection.createStatement();
071          rs = stmt.executeQuery("SELECT version FROM " + SchemaMigration.TABLE_NAME);
072          while (rs.next()) {
073            int i = Integer.parseInt(rs.getString(1));
074            if (i > version) {
075              version = i;
076            }
077          }
078        } catch (SQLException e) {
079          // ignore
080        } finally {
081          close(rs);
082          close(stmt);
083        }
084    
085        return version;
086      }
087    
088      private static void close(ResultSet rs) {
089        if (rs != null) {
090          try {
091            rs.close();
092          } catch (SQLException e) {
093            // why does close() throw a checked-exception ???
094          }
095        }
096      }
097    
098      private static void close(Statement st) {
099        if (st != null) {
100          try {
101            st.close();
102          } catch (SQLException e) {
103            // why does close() throw a checked-exception ???
104          }
105        }
106      }
107    
108      @Override
109      public String toString() {
110        return new ReflectionToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE).toString();
111      }
112    }