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/*
* This file is part of DNPMHelper
*
* Copyright (C) 2023-2026 the original author or authors.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package dev.dnpm.oshelper.migration;
import java.io.IOException;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.JdbcTemplate;
/**
* Diese Klasse implementiert die Durchführung einer Datenbankmigration
*
* @since 2.3.0
*/
public class DatabaseMigrationService {
private final Logger log = LoggerFactory.getLogger(DatabaseMigrationService.class);
private final JdbcTemplate jdbcTemplate;
private final ResourcePatternResolver resourcePatternResolver;
public DatabaseMigrationService(
final JdbcTemplate jdbcTemplate, final ResourcePatternResolver resourcePatternResolver) {
this.jdbcTemplate = jdbcTemplate;
this.resourcePatternResolver = resourcePatternResolver;
}
/**
* Diese Methode führt eine Datenbankmigration durch. Es werden alle Migrationen durchgeführt, die
* noch nicht angewendet wurden.
*/
public void migrate() {
log.info("Starting database migration");
try {
for (var migration : this.getNewMigrationIds()) {
if (!requiredFormRevisionAvailable(migration)) {
log.info("Skipping database migration due to pre-condition: '{}'", migration);
continue;
}
log.info("Apply database migration: '{}'", migration);
try {
jdbcTemplate.execute(MigrationUtils.getSqlQuery(resourcePatternResolver, migration));
} catch (DataAccessException e) {
jdbcTemplate.update(
"INSERT INTO update_db (date, update_script, failed, fail_description) VALUES (NOW(), ?, ?, ?)",
migration,
true,
e.getMessage().length() > 1000 ? e.getMessage().substring(0, 1000) : e.getMessage());
continue;
}
jdbcTemplate.update(
"INSERT INTO update_db (date, update_script, failed) VALUES (NOW(), ?, ?)",
migration,
false);
}
} catch (Exception e) {
log.error("Error while migrating database", e);
}
}
private boolean requiredFormRevisionAvailable(String migration) throws IOException {
final var sqlQuery = MigrationUtils.getSqlQuery(resourcePatternResolver, migration);
String formName = null;
Pattern formNamePattern = Pattern.compile("(?m)^-- form: (.+)$");
Matcher formNameMatcher = formNamePattern.matcher(sqlQuery);
if (formNameMatcher.find()) {
formName = formNameMatcher.group(1);
}
String minRev = "0";
Pattern minRevPattern = Pattern.compile("(?m)^-- min-rev: (\\d+)$");
Matcher minRevMatcher = minRevPattern.matcher(sqlQuery);
if (minRevMatcher.find()) {
minRev = minRevMatcher.group(1);
}
String maxRev = "99999999999999";
Pattern maxRevPattern = Pattern.compile("(?m)^-- max-rev: (\\d+)$");
Matcher maxRevMatcher = maxRevPattern.matcher(sqlQuery);
if (maxRevMatcher.find()) {
maxRev = maxRevMatcher.group(1);
}
if (formName == null) {
// No spezial form revision required
return true;
}
return MigrationUtils.requiredFormRevisionAvailable(
this.jdbcTemplate, formName, minRev, maxRev);
}
List<String> getNewMigrationIds() throws Exception {
var existingMigrations = MigrationUtils.getExecutedDatabaseMigrations(this.jdbcTemplate);
return MigrationUtils.getDatabaseMigrationScripts(this.resourcePatternResolver).stream()
.filter(migration -> !existingMigrations.contains(migration))
.collect(Collectors.toList());
}
}
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