package liquibase.snapshot.jvm;
import liquibase.CatalogAndSchema;
import liquibase.database.Database;
import liquibase.database.core.*;
import liquibase.database.core.DB2Database.DataServerType;
import liquibase.exception.DatabaseException;
import liquibase.exception.UnexpectedLiquibaseException;
import liquibase.executor.ExecutorService;
import liquibase.snapshot.InvalidExampleException;
import liquibase.snapshot.SnapshotGeneratorChain;
import liquibase.snapshot.DatabaseSnapshot;
import liquibase.snapshot.SnapshotIdService;
import liquibase.statement.core.RawSqlStatement;
import liquibase.structure.DatabaseObject;
import liquibase.structure.core.Schema;
import liquibase.structure.core.Sequence;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class SequenceSnapshotGenerator extends JdbcSnapshotGenerator {
public SequenceSnapshotGenerator() {
super(Sequence.class, new Class[]{Schema.class});
}
@Override
protected void addTo(DatabaseObject foundObject, DatabaseSnapshot snapshot) throws DatabaseException, InvalidExampleException {
if (!snapshot.getDatabase().supportsSequences()) {
return;
}
if (foundObject instanceof Schema) {
Schema schema = (Schema) foundObject;
Database database = snapshot.getDatabase();
if (!database.supportsSequences()) {
updateListeners("Sequences not supported for " + database.toString() + " ...");
}
//noinspection unchecked
List<Map<String, ?>> sequences = ExecutorService.getInstance().getExecutor(database).queryForList(new RawSqlStatement(getSelectSequenceSql(schema, database)));
if (sequences != null) {
for (Map<String, ?> sequence : sequences) {
schema.addDatabaseObject(mapToSequence(sequence, (Schema) foundObject, database));
}
}
}
}
@Override
protected DatabaseObject snapshotObject(DatabaseObject example, DatabaseSnapshot snapshot) throws DatabaseException {
if (example.getSnapshotId() != null) {
return example;
}
if (example.getAttribute("liquibase-complete", false)) { //need to go through "snapshotting" the object even if it was previously populated in addTo. Use the "liquibase-complete" attribute to track that it doesn't need to be fully snapshotted
example.setSnapshotId(SnapshotIdService.getInstance().generateId());
example.setAttribute("liquibase-complete", null);
return example;
}
Database database = snapshot.getDatabase();
if (!database.supportsSequences()) {
return null;
}
List<Map<String, ?>> sequences = ExecutorService.getInstance().getExecutor(database).queryForList(new RawSqlStatement(getSelectSequenceSql(example.getSchema(), database)));
for (Map<String, ?> sequenceRow : sequences) {
String name = cleanNameFromDatabase((String) sequenceRow.get("SEQUENCE_NAME"), database);
if ((database.isCaseSensitive() && name.equals(example.getName()) || (!database.isCaseSensitive() && name.equalsIgnoreCase(example.getName())))) {
return mapToSequence(sequenceRow, example.getSchema(), database);
}
}
return null;
}
private Sequence mapToSequence(Map<String, ?> sequenceRow, Schema schema, Database database) {
String name = cleanNameFromDatabase((String) sequenceRow.get("SEQUENCE_NAME"), database);
Sequence seq = new Sequence();
seq.setName(name);
seq.setSchema(schema);
seq.setStartValue(toBigInteger(sequenceRow.get("START_VALUE"), database));
seq.setMinValue(toBigInteger(sequenceRow.get("MIN_VALUE"), database));
seq.setMaxValue(toBigInteger(sequenceRow.get("MAX_VALUE"), database));
seq.setCacheSize(toBigInteger(sequenceRow.get("CACHE_SIZE"), database));
seq.setIncrementBy(toBigInteger(sequenceRow.get("INCREMENT_BY"), database));
seq.setWillCycle(toBoolean(sequenceRow.get("WILL_CYCLE"), database));
seq.setOrdered(toBoolean(sequenceRow.get("IS_ORDERED"), database));
seq.setAttribute("liquibase-complete", true);
return seq;
}
protected Boolean toBoolean(Object value, Database database) {
if (value == null) {
return null;
}
if (value instanceof Boolean) {
return (Boolean) value;
}
String valueAsString = value.toString();
valueAsString = valueAsString.replace("'", "");
if (valueAsString.equalsIgnoreCase("true")
|| valueAsString.equalsIgnoreCase("'true'")
|| valueAsString.equalsIgnoreCase("y")
|| valueAsString.equalsIgnoreCase("1")
|| valueAsString.equalsIgnoreCase("t")) {
return Boolean.TRUE;
} else {
return Boolean.FALSE;
}
}
protected BigInteger toBigInteger(Object value, Database database) {
if (value == null) {
return null;
}
if (value instanceof BigInteger) {
return (BigInteger) value;
}
return new BigInteger(value.toString());
}
protected String getSelectSequenceSql(Schema schema, Database database) {
if (database instanceof DB2Database) {
if (((DB2Database) database).getDataServerType() == DataServerType.DB2I) {
return "SELECT SEQNAME AS SEQUENCE_NAME FROM QSYS2.SYSSEQUENCES WHERE SEQSCHEMA = '" + schema.getCatalogName() + "'";
} else if (((DB2Database) database).getDataServerType() == DataServerType.DB2Z){
return "SELECT NAME AS SEQUENCE_NAME FROM SYSIBM.SYSSEQUENCES WHERE SEQTYPE='S' AND SCHEMA = '" + schema.getCatalogName() + "'";
} else {
return "SELECT SEQNAME AS SEQUENCE_NAME FROM SYSCAT.SEQUENCES WHERE SEQTYPE='S' AND SEQSCHEMA = '" + schema.getCatalogName() + "'";
}
//return "SELECT SEQNAME AS SEQUENCE_NAME FROM SYSCAT.SEQUENCES WHERE SEQTYPE='S' AND SEQSCHEMA = '" + schema.getCatalogName() + "'";
} else if (database instanceof DerbyDatabase) {
return "SELECT " +
" seq.SEQUENCENAME AS SEQUENCE_NAME " +
"FROM " +
" SYS.SYSSEQUENCES seq, " +
" SYS.SYSSCHEMAS sch " +
"WHERE " +
" sch.SCHEMANAME = '" + new CatalogAndSchema(null, schema.getName()).customize(database).getSchemaName() + "' AND " +
" sch.SCHEMAID = seq.SCHEMAID";
} else if (database instanceof FirebirdDatabase) {
return "SELECT RDB$GENERATOR_NAME AS SEQUENCE_NAME FROM RDB$GENERATORS WHERE RDB$SYSTEM_FLAG IS NULL OR RDB$SYSTEM_FLAG = 0";
} else if (database instanceof H2Database) {
return "SELECT SEQUENCE_NAME FROM INFORMATION_SCHEMA.SEQUENCES WHERE SEQUENCE_SCHEMA = '" + schema.getName() + "' AND IS_GENERATED=FALSE";
} else if (database instanceof HsqlDatabase) {
return "SELECT SEQUENCE_NAME FROM INFORMATION_SCHEMA.SYSTEM_SEQUENCES WHERE SEQUENCE_SCHEMA = '" + schema.getName() + "'";
} else if (database instanceof InformixDatabase) {
return "SELECT tabname AS SEQUENCE_NAME FROM systables t, syssequences s WHERE s.tabid = t.tabid AND t.owner = '" + schema.getName() + "'";
} else if (database instanceof OracleDatabase) {
return "SELECT SEQUENCE_NAME AS SEQUENCE_NAME, MIN_VALUE, MAX_VALUE, INCREMENT_BY, CYCLE_FLAG AS WILL_CYCLE, ORDER_FLAG AS IS_ORDERED, LAST_NUMBER as START_VALUE, CACHE_SIZE FROM ALL_SEQUENCES WHERE SEQUENCE_OWNER = '" + schema.getCatalogName() + "'";
} else if (database instanceof PostgresDatabase) {
return "SELECT c.relname AS SEQUENCE_NAME FROM pg_class c " +
"join pg_namespace on c.relnamespace = pg_namespace.oid "+
"WHERE c.relkind='S' " +
"AND nspname = '" + schema.getName() + "' " +
"AND c.oid not in (select d.objid FROM pg_depend d where d.refobjsubid > 0)"
;
// select c.relname FROM pg_class c, pg_user u
// WHERE c.relowner = u.usesysid and c.relkind = 'S'
// AND relnamespace IN (
// SELECT oid
// FROM pg_namespace
// WHERE nspname ='public'
// ) and c.oid not in (SELECT d.objid
// FROM pg_depend d
// JOIN pg_attribute a ON a.attrelid = d.refobjid AND a.attnum = d.refobjsubid
// WHERE d.refobjsubid > 0
// );
} else if (database instanceof MSSQLDatabase) {
return "SELECT SEQUENCE_NAME, " +
"cast(START_VALUE AS BIGINT) AS START_VALUE, " +
"cast(MINIMUM_VALUE AS BIGINT) AS MIN_VALUE, " +
"cast(MAXIMUM_VALUE AS BIGINT) AS MAX_VALUE, " +
"CAST(INCREMENT AS BIGINT) AS INCREMENT_BY, " +
"CYCLE_OPTION AS WILL_CYCLE " +
"FROM INFORMATION_SCHEMA.SEQUENCES WHERE SEQUENCE_SCHEMA = '" + schema.getName() + "'";
} else {
throw new UnexpectedLiquibaseException("Don't know how to query for sequences on " + database);
}
}
//from SQLiteDatbaseSnapshotGenerator
// protected void readSequences(DatabaseSnapshot snapshot, String schema, DatabaseMetaData databaseMetaData) throws DatabaseException {
// Database database = snapshot.getDatabase();
// updateListeners("Reading sequences for " + database.toString() + " ...");
//
// String convertedSchemaName = database.convertRequestedSchemaToSchema(schema);
//
// if (database.supportsSequences()) {
// //noinspection unchecked
// List<String> sequenceNamess = (List<String>) ExecutorService.getInstance().getExecutor(database).queryForList(new SelectSequencesStatement(schema), String.class);
//
//
// for (String sequenceName : sequenceNamess) {
// Sequence seq = new Sequence();
// seq.setName(sequenceName.trim());
// seq.setName(convertedSchemaName);
//
// snapshot.getSequences().add(seq);
// }
// }
// }
}