@Override
public void init() throws DatabaseException {
boolean createdTable = false;
Executor executor = ExecutorService.getInstance().getExecutor(database);
if (!hasDatabaseChangeLogLockTable()) {
executor.comment("Create Database Lock Table");
executor.execute(new CreateDatabaseChangeLogLockTableStatement());
database.commit();
LogFactory.getLogger()
.debug(
"Created database lock table with name: "
+ database.escapeTableName(
database.getLiquibaseCatalogName(),
database.getLiquibaseSchemaName(),
database.getDatabaseChangeLogLockTableName()));
this.hasDatabaseChangeLogLockTable = true;
createdTable = true;
}
if (!isDatabaseChangeLogLockTableInitialized(createdTable)) {
executor.comment("Initialize Database Lock Table");
executor.execute(new InitializeDatabaseChangeLogLockTableStatement());
database.commit();
}
if (database instanceof DerbyDatabase
&& ((DerbyDatabase) database)
.supportsBooleanDataType()) { // check if the changelog table is of an old smallint vs.
// boolean format
String lockTable =
database.escapeTableName(
database.getLiquibaseCatalogName(),
database.getLiquibaseSchemaName(),
database.getDatabaseChangeLogLockTableName());
Object obj =
executor.queryForObject(
new RawSqlStatement(
"select min(locked) as test from " + lockTable + " fetch first row only"),
Object.class);
if (!(obj instanceof Boolean)) { // wrong type, need to recreate table
executor.execute(
new DropTableStatement(
database.getLiquibaseCatalogName(),
database.getLiquibaseSchemaName(),
database.getDatabaseChangeLogLockTableName(),
false));
executor.execute(new CreateDatabaseChangeLogLockTableStatement());
executor.execute(new InitializeDatabaseChangeLogLockTableStatement());
}
}
}
public boolean isDatabaseChangeLogLockTableInitialized(final boolean tableJustCreated)
throws DatabaseException {
if (!isDatabaseChangeLogLockTableInitialized) {
Executor executor = ExecutorService.getInstance().getExecutor(database);
try {
isDatabaseChangeLogLockTableInitialized =
executor.queryForInt(
new RawSqlStatement(
"select count(*) from "
+ database.escapeTableName(
database.getLiquibaseCatalogName(),
database.getLiquibaseSchemaName(),
database.getDatabaseChangeLogLockTableName())))
> 0;
} catch (LiquibaseException e) {
if (executor.updatesDatabase()) {
throw new UnexpectedLiquibaseException(e);
} else {
// probably didn't actually create the table yet.
isDatabaseChangeLogLockTableInitialized = !tableJustCreated;
}
}
}
return isDatabaseChangeLogLockTableInitialized;
}
public void releaseLock() throws DatabaseException, LockException {
Executor executor = ExecutorService.getInstance().getExecutor(database);
try {
if (database.hasDatabaseChangeLogLockTable()) {
executor.comment("Release Database Lock");
database.rollback();
int updatedRows = executor.update(new UnlockDatabaseChangeLogStatement());
if (updatedRows != 1) {
throw new LockException(
"Did not update change log lock correctly.\n\n"
+ updatedRows
+ " rows were updated instead of the expected 1 row using executor "
+ executor.getClass().getName()
+ " there are "
+ executor.queryForInt(
new RawSqlStatement(
"select count(*) from " + database.getDatabaseChangeLogLockTableName()))
+ " rows in the table");
}
database.commit();
hasChangeLogLock = false;
instances.remove(this.database);
database.setCanCacheLiquibaseTableInfo(false);
LogFactory.getLogger().info("Successfully released change log lock");
}
} finally {
database.rollback();
}
}
@Override
public void destroy() throws DatabaseException {
try {
if (SnapshotGeneratorFactory.getInstance()
.has(
new Table()
.setName(database.getDatabaseChangeLogLockTableName())
.setSchema(database.getLiquibaseCatalogName(), database.getLiquibaseSchemaName()),
database)) {
ExecutorService.getInstance()
.getExecutor(database)
.execute(
new DropTableStatement(
database.getLiquibaseCatalogName(),
database.getLiquibaseSchemaName(),
database.getDatabaseChangeLogLockTableName(),
false));
}
} catch (InvalidExampleException e) {
throw new UnexpectedLiquibaseException(e);
}
}
