官方网站：https://www.liquibase.org/
liquibase官网版本支持的数据库类型有：cockroachdb、db2、db2z、Derby、firebird、H2、hsqldb、informix，ingres、MariaDB、mock、Microsoft SQL Server、MySQL、Oracle、Postgres、Sqlite、Sybase。对国产化数据库达梦的适配至少需要进行如下的修改
1. 创建DmDatabase，继承AbstractJdbcDatabase，具体的类实现从OracleDatabase类中复制，然后进行如下修改
- 删除setConnection方法；
- 修改PRODUCT_NAME常量值为“DM DBMS”；
- 修改getDefaultPort方法，返回5236；
- 修改getShortName方法，返回dm
- 修改getDefaultDriver方法，返回达梦的Driver。
具体代码如下：
public class DmDatabase extends AbstractJdbcDatabase {private static final String PRODUCT_NAME = "DM DBMS";@Overrideprotected String getDefaultDatabaseProductName() {return PRODUCT_NAME;}/*** Is this AbstractDatabase subclass the correct one to use for the given connection.** @param conn*/@Overridepublic boolean isCorrectDatabaseImplementation(DatabaseConnection conn) throws DatabaseException {return PRODUCT_NAME.equalsIgnoreCase(conn.getDatabaseProductName());}/*** If this database understands the given url, return the default driver class name. Otherwise return null.** @param url*/@Overridepublic String getDefaultDriver(String url) {if(url.startsWith("jdbc:dm")) {return "dm.jdbc.driver.DmDriver";}return null;}/*** Returns an all-lower-case short name of the product. Used for end-user selecting of database type* such as the DBMS precondition.*/@Overridepublic String getShortName() {return "dm";}@Overridepublic Integer getDefaultPort() {return 5236;}/*** Returns whether this database support initially deferrable columns.*/@Overridepublic boolean supportsInitiallyDeferrableColumns() {return true;}@Overridepublic boolean supportsTablespaces() {return true;}@Overridepublic int getPriority() {return PRIORITY_DEFAULT;}private static final Pattern PROXY_USER = Pattern.compile(".*(?:thin|oci)\\:(.+)/@.*");protected final int SHORT_IDENTIFIERS_LENGTH = 30;protected final int LONG_IDENTIFIERS_LEGNTH = 128;public static final int ORACLE_12C_MAJOR_VERSION = 12;private Set<String> reservedWords = new HashSet<>();private Set<String> userDefinedTypes;private Map<String, String> savedSessionNlsSettings;private Boolean canAccessDbaRecycleBin;private Integer databaseMajorVersion;private Integer databaseMinorVersion;/*** Default constructor for an object that represents the Oracle Database DBMS.*/public DmDatabase() {super.unquotedObjectsAreUppercased = true;//noinspection HardCodedStringLiteralsuper.setCurrentDateTimeFunction("SYSTIMESTAMP");// Setting list of Oracle's native functions//noinspection HardCodedStringLiteraldateFunctions.add(new DatabaseFunction("SYSDATE"));//noinspection HardCodedStringLiteraldateFunctions.add(new DatabaseFunction("SYSTIMESTAMP"));//noinspection HardCodedStringLiteraldateFunctions.add(new DatabaseFunction("CURRENT_TIMESTAMP"));//noinspection HardCodedStringLiteralsuper.sequenceNextValueFunction = "%s.nextval";//noinspection HardCodedStringLiteralsuper.sequenceCurrentValueFunction = "%s.currval";}private void tryProxySession(final String url, final Connection con) {Matcher m = PROXY_USER.matcher(url);if (m.matches()) {Properties props = new Properties();props.put("PROXY_USER_NAME", m.group(1));try {Method method = con.getClass().getMethod("openProxySession", int.class, Properties.class);method.setAccessible(true);method.invoke(con, 1, props);} catch (Exception e) {Scope.getCurrentScope().getLog(getClass()).info("Could not open proxy session on OracleDatabase: " + e.getCause().getMessage());}}}@Overridepublic int getDatabaseMajorVersion() throws DatabaseException {if (databaseMajorVersion == null) {return super.getDatabaseMajorVersion();} else {return databaseMajorVersion;}}@Overridepublic int getDatabaseMinorVersion() throws DatabaseException {if (databaseMinorVersion == null) {return super.getDatabaseMinorVersion();} else {return databaseMinorVersion;}}@Overridepublic String getJdbcCatalogName(CatalogAndSchema schema) {return null;}@Overridepublic String getJdbcSchemaName(CatalogAndSchema schema) {return correctObjectName((schema.getCatalogName() == null) ? schema.getSchemaName() : schema.getCatalogName(), Schema.class);}@Overrideprotected String getAutoIncrementClause(final String generationType, final Boolean defaultOnNull) {if (StringUtil.isEmpty(generationType)) {return super.getAutoIncrementClause();}String autoIncrementClause = "GENERATED %s AS IDENTITY"; // %s -- [ ALWAYS | BY DEFAULT [ ON NULL ] ]String generationStrategy = generationType;if (Boolean.TRUE.equals(defaultOnNull) && generationType.toUpperCase().equals("BY DEFAULT")) {generationStrategy += " ON NULL";}return String.format(autoIncrementClause, generationStrategy);}@Overridepublic String generatePrimaryKeyName(String tableName) {if (tableName.length() > 27) {//noinspection HardCodedStringLiteralreturn "PK_" + tableName.toUpperCase(Locale.US).substring(0, 27);} else {//noinspection HardCodedStringLiteralreturn "PK_" + tableName.toUpperCase(Locale.US);}}@Overridepublic boolean isReservedWord(String objectName) {return reservedWords.contains(objectName.toUpperCase());}@Overridepublic boolean supportsSequences() {return true;}/*** Oracle supports catalogs in liquibase terms** @return false*/@Overridepublic boolean supportsSchemas() {return false;}@Overrideprotected String getConnectionCatalogName() throws DatabaseException {if (getConnection() instanceof OfflineConnection) {return getConnection().getCatalog();}try {//noinspection HardCodedStringLiteralreturn Scope.getCurrentScope().getSingleton(ExecutorService.class).getExecutor("jdbc", this).queryForObject(new RawCallStatement("select sys_context( 'userenv', 'current_schema' ) from dual"), String.class);} catch (Exception e) {//noinspection HardCodedStringLiteralScope.getCurrentScope().getLog(getClass()).info("Error getting default schema", e);}return null;}@Overridepublic String getDefaultCatalogName() {//NOPMDreturn (super.getDefaultCatalogName() == null) ? null : super.getDefaultCatalogName().toUpperCase(Locale.US);}/*** <p>Returns an Oracle date literal with the same value as a string formatted using ISO 8601.</p>** <p>Convert an ISO8601 date string to one of the following results:* to_date('1995-05-23', 'YYYY-MM-DD')* to_date('1995-05-23 09:23:59', 'YYYY-MM-DD HH24:MI:SS')</p>* <p>* Implementation restriction:<br>* Currently, only the following subsets of ISO8601 are supported:<br>* <ul>* <li>YYYY-MM-DD</li>* <li>YYYY-MM-DDThh:mm:ss</li>* </ul>*/@Overridepublic String getDateLiteral(String isoDate) {String normalLiteral = super.getDateLiteral(isoDate);if (isDateOnly(isoDate)) {return "TO_DATE(" + normalLiteral + ", 'YYYY-MM-DD')";} else if (isTimeOnly(isoDate)) {return "TO_DATE(" + normalLiteral + ", 'HH24:MI:SS')";} else if (isTimestamp(isoDate)) {return "TO_TIMESTAMP(" + normalLiteral + ", 'YYYY-MM-DD HH24:MI:SS.FF')";} else if (isDateTime(isoDate)) {int seppos = normalLiteral.lastIndexOf('.');if (seppos != -1) {normalLiteral = normalLiteral.substring(0, seppos) + "'";}return "TO_DATE(" + normalLiteral + ", 'YYYY-MM-DD HH24:MI:SS')";}return "UNSUPPORTED:" + isoDate;}@Overridepublic boolean isSystemObject(DatabaseObject example) {if (example == null) {return false;}if (this.isLiquibaseObject(example)) {return false;}if (example instanceof Schema) {//noinspection HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteralif ("SYSTEM".equals(example.getName()) || "SYS".equals(example.getName()) || "CTXSYS".equals(example.getName()) || "XDB".equals(example.getName())) {return true;}//noinspection HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteralif ("SYSTEM".equals(example.getSchema().getCatalogName()) || "SYS".equals(example.getSchema().getCatalogName()) || "CTXSYS".equals(example.getSchema().getCatalogName()) || "XDB".equals(example.getSchema().getCatalogName())) {return true;}} else if (isSystemObject(example.getSchema())) {return true;}if (example instanceof Catalog) {//noinspection HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteralif (("SYSTEM".equals(example.getName()) || "SYS".equals(example.getName()) || "CTXSYS".equals(example.getName()) || "XDB".equals(example.getName()))) {return true;}} else if (example.getName() != null) {//noinspection HardCodedStringLiteralif (example.getName().startsWith("BIN$")) { //oracle deleted tableboolean filteredInOriginalQuery = this.canAccessDbaRecycleBin();if (!filteredInOriginalQuery) {filteredInOriginalQuery = StringUtil.trimToEmpty(example.getSchema().getName()).equalsIgnoreCase(this.getConnection().getConnectionUserName());}if (filteredInOriginalQuery) {return !((example instanceof PrimaryKey) || (example instanceof Index) || (example instanceofliquibase.statement.UniqueConstraint));} else {return true;}} else //noinspection HardCodedStringLiteralif (example.getName().startsWith("AQ$")) { //oracle AQ tablesreturn true;} else //noinspection HardCodedStringLiteralif (example.getName().startsWith("DR$")) { //oracle index tablesreturn true;} else //noinspection HardCodedStringLiteralif (example.getName().startsWith("SYS_IOT_OVER")) { //oracle system tablereturn true;} else //noinspection HardCodedStringLiteral,HardCodedStringLiteralif ((example.getName().startsWith("MDRT_") || example.getName().startsWith("MDRS_")) && example.getName().endsWith("$")) {// CORE-1768 - Oracle creates these for spatial indices and will remove them when the index is removed.return true;} else //noinspection HardCodedStringLiteralif (example.getName().startsWith("MLOG$_")) { //Created by materliaized view logs for every table that is part of a materialized view. Not available for DDL operations.return true;} else //noinspection HardCodedStringLiteralif (example.getName().startsWith("RUPD$_")) { //Created by materialized view log tables using primary keys. Not available for DDL operations.return true;} else //noinspection HardCodedStringLiteralif (example.getName().startsWith("WM$_")) { //Workspace Manager backup tables.return true;} else //noinspection HardCodedStringLiteralif ("CREATE$JAVA$LOB$TABLE".equals(example.getName())) { //This table contains the name of the Java object, the date it was loaded, and has a BLOB column to store the Java object.return true;} else //noinspection HardCodedStringLiteralif ("JAVA$CLASS$MD5$TABLE".equals(example.getName())) { //This is a hash table that tracks the loading of Java objects into a schema.return true;} else //noinspection HardCodedStringLiteralif (example.getName().startsWith("ISEQ$$_")) { //System-generated sequencereturn true;} else //noinspection HardCodedStringLiteralif (example.getName().startsWith("USLOG$")) { //for update materialized viewreturn true;} else if (example.getName().startsWith("SYS_FBA")) { //for Flashback tablesreturn true;}}return super.isSystemObject(example);}@Overridepublic boolean supportsAutoIncrement() {// Oracle supports Identity beginning with version 12cboolean isAutoIncrementSupported = false;try {if (getDatabaseMajorVersion() >= 12) {isAutoIncrementSupported = true;}// Returning true will generate create table command with 'IDENTITY' clause, example:// CREATE TABLE AutoIncTest (IDPrimaryKey NUMBER(19) GENERATED BY DEFAULT AS IDENTITY NOT NULL, TypeID NUMBER(3) NOT NULL, Description NVARCHAR2(50), CONSTRAINT PK_AutoIncTest PRIMARY KEY (IDPrimaryKey));// While returning false will continue to generate create table command without 'IDENTITY' clause, example:// CREATE TABLE AutoIncTest (IDPrimaryKey NUMBER(19) NOT NULL, TypeID NUMBER(3) NOT NULL, Description NVARCHAR2(50), CONSTRAINT PK_AutoIncTest PRIMARY KEY (IDPrimaryKey));} catch (DatabaseException ex) {isAutoIncrementSupported = false;}return isAutoIncrementSupported;}// public Set<UniqueConstraint> findUniqueConstraints(String schema) throws DatabaseException {
// Set<UniqueConstraint> returnSet = new HashSet<UniqueConstraint>();
//
// List<Map> maps = new Executor(this).queryForList(new RawSqlStatement("SELECT UC.CONSTRAINT_NAME, UCC.TABLE_NAME, UCC.COLUMN_NAME FROM USER_CONSTRAINTS UC, USER_CONS_COLUMNS UCC WHERE UC.CONSTRAINT_NAME=UCC.CONSTRAINT_NAME AND CONSTRAINT_TYPE='U' ORDER BY UC.CONSTRAINT_NAME"));
//
// UniqueConstraint constraint = null;
// for (Map map : maps) {
// if (constraint == null || !constraint.getName().equals(constraint.getName())) {
// returnSet.add(constraint);
// Table table = new Table((String) map.get("TABLE_NAME"));
// constraint = new UniqueConstraint(map.get("CONSTRAINT_NAME").toString(), table);
// }
// }
// if (constraint != null) {
// returnSet.add(constraint);
// }
//
// return returnSet;
// }@Overridepublic boolean supportsRestrictForeignKeys() {return false;}@Overridepublic int getDataTypeMaxParameters(String dataTypeName) {//noinspection HardCodedStringLiteralif ("BINARY_FLOAT".equals(dataTypeName.toUpperCase())) {return 0;}//noinspection HardCodedStringLiteralif ("BINARY_DOUBLE".equals(dataTypeName.toUpperCase())) {return 0;}return super.getDataTypeMaxParameters(dataTypeName);}public String getSystemTableWhereClause(String tableNameColumn) {List<String> clauses = new ArrayList<String>(Arrays.asList("BIN$","AQ$","DR$","SYS_IOT_OVER","MLOG$_","RUPD$_","WM$_","ISEQ$$_","USLOG$","SYS_FBA"));for (int i = 0;i<clauses.size(); i++) {clauses.set(i, tableNameColumn+" NOT LIKE '"+clauses.get(i)+"%'");}return "("+ StringUtil.join(clauses, " AND ") + ")";}@Overridepublic boolean jdbcCallsCatalogsSchemas() {return true;}public Set<String> getUserDefinedTypes() {if (userDefinedTypes == null) {userDefinedTypes = new HashSet<>();if ((getConnection() != null) && !(getConnection() instanceof OfflineConnection)) {try {try {//noinspection HardCodedStringLiteraluserDefinedTypes.addAll(Scope.getCurrentScope().getSingleton(ExecutorService.class).getExecutor("jdbc", this).queryForList(new RawSqlStatement("SELECT DISTINCT TYPE_NAME FROM ALL_TYPES"), String.class));} catch (DatabaseException e) { //fall back to USER_TYPES if the user cannot see ALL_TYPES//noinspection HardCodedStringLiteraluserDefinedTypes.addAll(Scope.getCurrentScope().getSingleton(ExecutorService.class).getExecutor("jdbc", this).queryForList(new RawSqlStatement("SELECT TYPE_NAME FROM USER_TYPES"), String.class));}} catch (DatabaseException e) {//ignore error}}}return userDefinedTypes;}@Overridepublic String generateDatabaseFunctionValue(DatabaseFunction databaseFunction) {//noinspection HardCodedStringLiteralif ((databaseFunction != null) && "current_timestamp".equalsIgnoreCase(databaseFunction.toString())) {return databaseFunction.toString();}if ((databaseFunction instanceof SequenceNextValueFunction) || (databaseFunction instanceofSequenceCurrentValueFunction)) {String quotedSeq = super.generateDatabaseFunctionValue(databaseFunction);// replace "myschema.my_seq".nextval with "myschema"."my_seq".nextvalreturn quotedSeq.replaceFirst("\"([^\\.\"]+)\\.([^\\.\"]+)\"", "\"$1\".\"$2\"");}return super.generateDatabaseFunctionValue(databaseFunction);}@Overridepublic ValidationErrors validate() {ValidationErrors errors = super.validate();DatabaseConnection connection = getConnection();if ((connection == null) || (connection instanceof OfflineConnection)) {//noinspection HardCodedStringLiteralScope.getCurrentScope().getLog(getClass()).info("Cannot validate offline database");return errors;}if (!canAccessDbaRecycleBin()) {errors.addWarning(getDbaRecycleBinWarning());}return errors;}public String getDbaRecycleBinWarning() {//noinspection HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral,// HardCodedStringLiteral//noinspection HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteralreturn "Liquibase needs to access the DBA_RECYCLEBIN table so we can automatically handle the case where " +"constraints are deleted and restored. Since Oracle doesn't properly restore the original table names " +"referenced in the constraint, we use the information from the DBA_RECYCLEBIN to automatically correct this" +" issue.\n" +"\n" +"The user you used to connect to the database (" + getConnection().getConnectionUserName() +") needs to have \"SELECT ON SYS.DBA_RECYCLEBIN\" permissions set before we can perform this operation. " +"Please run the following SQL to set the appropriate permissions, and try running the command again.\n" +"\n" +" GRANT SELECT ON SYS.DBA_RECYCLEBIN TO " + getConnection().getConnectionUserName() + ";";}public boolean canAccessDbaRecycleBin() {if (canAccessDbaRecycleBin == null) {DatabaseConnection connection = getConnection();if ((connection == null) || (connection instanceof OfflineConnection)) {return false;}Statement statement = null;try {statement = ((JdbcConnection) connection).createStatement();@SuppressWarnings("HardCodedStringLiteral") ResultSet resultSet = statement.executeQuery("select 1 from dba_recyclebin where 0=1");resultSet.close(); //don't need to do anything with the result set, just make sure statement ran.this.canAccessDbaRecycleBin = true;} catch (Exception e) {//noinspection HardCodedStringLiteralif ((e instanceof SQLException) && e.getMessage().startsWith("ORA-00942")) { //ORA-00942: table or view does not existthis.canAccessDbaRecycleBin = false;} else {//noinspection HardCodedStringLiteralScope.getCurrentScope().getLog(getClass()).warning("Cannot check dba_recyclebin access", e);this.canAccessDbaRecycleBin = false;}} finally {JdbcUtils.close(null, statement);}}return canAccessDbaRecycleBin;}@Overridepublic boolean supportsNotNullConstraintNames() {return true;}/*** Tests if the given String would be a valid identifier in Oracle DBMS. In Oracle, a valid identifier has* the following form (case-insensitive comparison):* 1st character: A-Z* 2..n characters: A-Z0-9$_#* The maximum length of an identifier differs by Oracle version and object type.*/public boolean isValidOracleIdentifier(String identifier, Class<? extends DatabaseObject> type) {if ((identifier == null) || (identifier.length() < 1))return false;if (!identifier.matches("^(i?)[A-Z][A-Z0-9\\$\\_\\#]*$"))return false;/** @todo It seems we currently do not have a class for tablespace identifiers, and all other classes* we do know seem to be supported as 12cR2 long identifiers, so:*/return (identifier.length() <= LONG_IDENTIFIERS_LEGNTH);}/*** Returns the maximum number of bytes (NOT: characters) for an identifier. For Oracle <=12c Release 20, this* is 30 bytes, and starting from 12cR2, up to 128 (except for tablespaces, PDB names and some other rather rare* object types).** @return the maximum length of an object identifier, in bytes*/public int getIdentifierMaximumLength() {try {if (getDatabaseMajorVersion() < ORACLE_12C_MAJOR_VERSION) {return SHORT_IDENTIFIERS_LENGTH;} else if ((getDatabaseMajorVersion() == ORACLE_12C_MAJOR_VERSION) && (getDatabaseMinorVersion() <= 1)) {return SHORT_IDENTIFIERS_LENGTH;} else {return LONG_IDENTIFIERS_LEGNTH;}} catch (DatabaseException ex) {throw new UnexpectedLiquibaseException("Cannot determine the Oracle database version number", ex);}}2. 修改 liquibase.datatype.core.BooleanType类，以支持达梦的bit类型与java的Boolean类型的转换
- 在toDatabaseDataType方法中添加DmDatabase的支持
- 在isNumericBoolean方法中添加DmDatabase类型
具体代码如下：
@Overridepublic DatabaseDataType toDatabaseDataType(Database database) {String originalDefinition = StringUtil.trimToEmpty(getRawDefinition());if ((database instanceof Firebird3Database)) {return new DatabaseDataType("BOOLEAN");}if ((database instanceof AbstractDb2Database) || (database instanceof FirebirdDatabase)) {return new DatabaseDataType("SMALLINT");} else if (database instanceof MSSQLDatabase) {return new DatabaseDataType(database.escapeDataTypeName("bit"));} else if (database instanceof MySQLDatabase) {if (originalDefinition.toLowerCase(Locale.US).startsWith("bit")) {return new DatabaseDataType("BIT", getParameters());}return new DatabaseDataType("BIT", 1);} else if (database instanceof OracleDatabase) {return new DatabaseDataType("NUMBER", 1);} else if ((database instanceof SybaseASADatabase) || (database instanceof SybaseDatabase)) {return new DatabaseDataType("BIT");} else if (database instanceof DerbyDatabase) {if (((DerbyDatabase) database).supportsBooleanDataType()) {return new DatabaseDataType("BOOLEAN");} else {return new DatabaseDataType("SMALLINT");}} else if (database.getClass().isAssignableFrom(DB2Database.class)) {if (((DB2Database) database).supportsBooleanDataType())return new DatabaseDataType("BOOLEAN");elsereturn new DatabaseDataType("SMALLINT");} else if (database instanceof HsqlDatabase) {return new DatabaseDataType("BOOLEAN");} else if (database instanceof PostgresDatabase) {if (originalDefinition.toLowerCase(Locale.US).startsWith("bit")) {return new DatabaseDataType("BIT", getParameters());}} else if(database instanceof DmDatabase) {return new DatabaseDataType("bit");}return super.toDatabaseDataType(database);}@Overridepublic String objectToSql(Object value, Database database) {if ((value == null) || "null".equals(value.toString().toLowerCase(Locale.US))) {return null;}String returnValue;if (value instanceof String) {value = ((String) value).replaceAll("'", "");if ("true".equals(((String) value).toLowerCase(Locale.US)) || "1".equals(value) || "b'1'".equals(((String) value).toLowerCase(Locale.US)) || "t".equals(((String) value).toLowerCase(Locale.US)) || ((String) value).toLowerCase(Locale.US).equals(this.getTrueBooleanValue(database).toLowerCase(Locale.US))) {returnValue = this.getTrueBooleanValue(database);} else if ("false".equals(((String) value).toLowerCase(Locale.US)) || "0".equals(value) || "b'0'".equals(((String) value).toLowerCase(Locale.US)) || "f".equals(((String) value).toLowerCase(Locale.US)) || ((String) value).toLowerCase(Locale.US).equals(this.getFalseBooleanValue(database).toLowerCase(Locale.US))) {returnValue = this.getFalseBooleanValue(database);} else {throw new UnexpectedLiquibaseException("Unknown boolean value: " + value);}} else if (value instanceof Long) {if (Long.valueOf(1).equals(value)) {returnValue = this.getTrueBooleanValue(database);} else {returnValue = this.getFalseBooleanValue(database);}} else if (value instanceof Number) {if (value.equals(1) || "1".equals(value.toString()) || "1.0".equals(value.toString())) {returnValue = this.getTrueBooleanValue(database);} else {returnValue = this.getFalseBooleanValue(database);}} else if (value instanceof DatabaseFunction) {return value.toString();} else if (value instanceof Boolean) {if (((Boolean) value)) {returnValue = this.getTrueBooleanValue(database);} else {returnValue = this.getFalseBooleanValue(database);}} else {throw new UnexpectedLiquibaseException("Cannot convert type " + value.getClass() + " to a boolean value");}return returnValue;}protected boolean isNumericBoolean(Database database) {if (database instanceof DerbyDatabase) {return !((DerbyDatabase) database).supportsBooleanDataType();} else if (database.getClass().isAssignableFrom(DB2Database.class)) {return !((DB2Database) database).supportsBooleanDataType();}return (database instanceof Db2zDatabase) || (database instanceof DB2Database) || (database instanceof FirebirdDatabase) || (database instanceofMSSQLDatabase) || (database instanceof MySQLDatabase) || (database instanceof OracleDatabase) ||(database instanceof SQLiteDatabase) || (database instanceof SybaseASADatabase) || (database instanceofSybaseDatabase) || (database instanceof DmDatabase);}/*** The database-specific value to use for "false" "boolean" columns.*/public String getFalseBooleanValue(Database database) {if (isNumericBoolean(database)) {return "0";}if (database instanceof InformixDatabase) {return "'f'";}return "FALSE";}/*** The database-specific value to use for "true" "boolean" columns.*/public String getTrueBooleanValue(Database database) {if (isNumericBoolean(database)) {return "1";}if (database instanceof InformixDatabase) {return "'t'";}return "TRUE";}@Overridepublic LoadDataChange.LOAD_DATA_TYPE getLoadTypeName() {return LoadDataChange.LOAD_DATA_TYPE.BOOLEAN;}
3. 修改resources/META-INF.services/liquibase.database.Database内容，添加DmDatabase支持。修改后的文件内如下：
liquibase.database.core.CockroachDatabase
liquibase.database.core.DB2Database
liquibase.database.core.Db2zDatabase
liquibase.database.core.DerbyDatabase
liquibase.database.core.Firebird3Database
liquibase.database.core.FirebirdDatabase
liquibase.database.core.H2Database
liquibase.database.core.HsqlDatabase
liquibase.database.core.InformixDatabase
liquibase.database.core.Ingres9Database
liquibase.database.core.MSSQLDatabase
liquibase.database.core.MariaDBDatabase
liquibase.database.core.MockDatabase
liquibase.database.core.MySQLDatabase
liquibase.database.core.OracleDatabase
liquibase.database.core.PostgresDatabase
liquibase.database.core.SQLiteDatabase
liquibase.database.core.SybaseASADatabase
liquibase.database.core.SybaseDatabase
liquibase.database.core.DmDatabase
liquibase.database.core.UnsupportedDatabase
将下载的源码重新打包安装到本地仓库中即可支持达梦数据库。
当前的扩展方式可以支持基本的数据库表管理，更加完善的功能待用到或有时间之后在添加了