Flowable集成达梦8数据库
相信大部分人都和我一样，以为只要换个数据源就可以了，起初我只更换了数据源，并开启了自动创建表功能。
spring:
datasource:
url: jdbc:dm://127.0.0.1:5236?SCHEMA=FLOWABLE
username: FLOWABLE
password: 123456
driver-class-name: dm.jdbc.driver.DmDriver
type: com.alibaba.druid.pool.DruidDataSource
flowable:
#关闭定时任务JOB
async-executor-activate: false
database-schema-update: true
server:
port: 8081
但是运行时控制台报错
Caused by: org.flowable.common.engine.api.FlowableException: couldn’t deduct database type from database product name ‘DM DBMS’
根据Flowable官方文档，Flowable支持多种数据库，包括H2、Hsql、MySQL、Oracle、PostgreSQL、Microsoft SQL Server等，然而，根据Flowable官方文档，目前并不支持达梦数据库。
解决方案：
参考：https://blog.youkuaiyun.com/qq_37829708/article/details/124978212?spm=1001.2014.3001.5506
前排提示：如果按照步骤操作无解，可以查看我这篇博客的总结，里面也许会有解决方案。
在pom.xml中排除liquibase依赖，指定一个版本防止后续更新，我测试了两个版本4.3.5和4.9.1，启动时创建表正常执行，只要是4.x的版本应该都是通用的。
<!--flowable工作流依赖-->
<dependency>
<groupId>org.flowable</groupId>
<artifactId>flowable-spring-boot-starter</artifactId>
<version>6.8.0</version>
<exclusions>
<exclusion>
<groupId>org.liquibase</groupId>
<artifactId>liquibase-core</artifactId>
</exclusion>
</exclusions>
</dependency>
<!--数据库变更版本控制工具liquibase依赖-->
<dependency>
<groupId>org.liquibase</groupId>
<artifactId>liquibase-core</artifactId>
<version>4.9.1</version>
</dependency>
修改Flowable源码
- 修改
org.flowable.common.engine.impl.AbstractEngineConfiguration类，源码的位置如下：
这里采用覆盖的方式重写该源码类，这样避免了重新打包的问题，在项目中创建org.flowable.common.engine.impl.AbstractEngineConfiguration类，将源码中的代码全部复制到该类中。
创建后修改getDefaultDatabaseTypeMappings方法
public static Properties getDefaultDatabaseTypeMappings() {
Properties databaseTypeMappings = new Properties();
databaseTypeMappings.setProperty("H2", DATABASE_TYPE_H2);
databaseTypeMappings.setProperty("HSQL Database Engine", DATABASE_TYPE_HSQL);
databaseTypeMappings.setProperty("MySQL", DATABASE_TYPE_MYSQL);
databaseTypeMappings.setProperty("MariaDB", DATABASE_TYPE_MYSQL);
databaseTypeMappings.setProperty("Oracle", DATABASE_TYPE_ORACLE);
databaseTypeMappings.setProperty(PRODUCT_NAME_POSTGRES, DATABASE_TYPE_POSTGRES);
databaseTypeMappings.setProperty("Microsoft SQL Server", DATABASE_TYPE_MSSQL);
databaseTypeMappings.setProperty(DATABASE_TYPE_DB2, DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/NT", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/NT64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2 UDP", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUX", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUX390", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUXX8664", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUXZ64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUXPPC64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUXPPC64LE", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/400 SQL", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/6000", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2 UDB iSeries", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/AIX64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/HPUX", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/HP64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/SUN", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/SUN64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/PTX", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/2", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2 UDB AS400", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty(PRODUCT_NAME_CRDB, DATABASE_TYPE_COCKROACHDB);
databaseTypeMappings.setProperty("DM DBMS", DATABASE_TYPE_ORACLE); // 新增内容
return databaseTypeMappings;
}
- 低版本
Flowable没有dmn相关表的不用执行该步骤的操作，由于我是6.8版本，新增了许多其他功能，在启动时创建dmn相关表时，其中有一个更改表名的步骤，这个语法是达梦不支持的:
解决方法：
在resource目录下新增org/flowable/dmn/db/liquibase/custom-flowable-dmn-db-changelog.xml文件，并把源码中的内容复制进去，将id为7的changeSet标签删除，然后把下面的内容赋值到对应位置中：
<changeSet id="7" author="flowable" dbms="!dm">
<dropIndex tableName="ACT_DMN_DECISION_TABLE" indexName="ACT_IDX_DEC_TBL_UNIQ"/>
<renameTable
newTableName="ACT_DMN_DECISION"
oldTableName="ACT_DMN_DECISION_TABLE"/>
<createIndex tableName="ACT_DMN_DECISION" indexName="ACT_IDX_DMN_DEC_UNIQ" unique="true">
<column name="KEY_" />
<column name="VERSION_" />
<column name="TENANT_ID_" />
</createIndex>
</changeSet>
<changeSet id="7" author="flowable" dbms="dm">
<dropIndex tableName="ACT_DMN_DECISION_TABLE" indexName="ACT_IDX_DEC_TBL_UNIQ"/>
<sql>
CREATE TABLE ACT_DMN_DECISION AS SELECT * FROM ACT_DMN_DECISION_TABLE;
</sql>
<sql>
DROP TABLE ACT_DMN_DECISION_TABLE;
</sql>
<createIndex tableName="ACT_DMN_DECISION" indexName="ACT_IDX_DMN_DEC_UNIQ" unique="true">
<column name="KEY_" />
<column name="VERSION_" />
<column name="TENANT_ID_" />
</createIndex>
</changeSet>
在java文件下创建DmnDbSchemaManager类，全路径为org.flowable.dmn.engine.impl.db.DmnDbSchemaManager，将源码复制到自己创建的类中，并更改LIQUIBASE_CHANGELOG绑定的路径，更改为上面创建的custom-flowable-dmn-db-changelog.xml文件的路径。
上述变更的源码所在的位置，复制对应源码到自己创建的文件中。
修改Liquibase源码
-
在
java文件夹下创建DmDatabase类，全路径为liquibase.database.core.DmDatabase，参考了liquibase.database.core.OracleDatabase类，将下面代码直接粘进新创建的类。在这个类中由作者介绍更改如下：
- 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；
package liquibase.database.core;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import liquibase.CatalogAndSchema;
import liquibase.Scope;
import liquibase.database.AbstractJdbcDatabase;
import liquibase.database.DatabaseConnection;
import liquibase.database.OfflineConnection;
import liquibase.database.jvm.JdbcConnection;
import liquibase.exception.DatabaseException;
import liquibase.exception.UnexpectedLiquibaseException;
import liquibase.exception.ValidationErrors;
import liquibase.executor.ExecutorService;
import liquibase.statement.DatabaseFunction;
import liquibase.statement.SequenceCurrentValueFunction;
import liquibase.statement.SequenceNextValueFunction;
import liquibase.statement.core.RawCallStatement;
import liquibase.statement.core.RawSqlStatement;
import liquibase.structure.DatabaseObject;
import liquibase.structure.core.Catalog;
import liquibase.structure.core.Index;
import liquibase.structure.core.PrimaryKey;
import liquibase.structure.core.Schema;
import liquibase.util.JdbcUtils;
import liquibase.util.StringUtil;
public class DmDatabase extends AbstractJdbcDatabase {
private static final String PRODUCT_NAME = "DM DBMS";
@Override
protected String getDefaultDatabaseProductName() {
return PRODUCT_NAME;
}
/**
* Is this AbstractDatabase subclass the correct one to use for the given connection.
*
* @param conn
*/
@Override
public 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
*/
@Override
public 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.
*/
@Override
public String getShortName() {
return "dm";
}
@Override
public Integer getDefaultPort() {
return 5236;
}
/**
* Returns whether this database support initially deferrable columns.
*/
@Override
public boolean supportsInitiallyDeferrableColumns() {
return true;
}
@Override
public boolean supportsTablespaces() {
return true;
}
@Override
public 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 HardCodedStringLiteral
super.setCurrentDateTimeFunction("SYSTIMESTAMP");
// Setting list of Oracle's native functions
//noinspection HardCodedStringLiteral
dateFunctions.add(new DatabaseFunction("SYSDATE"));
//noinspection HardCodedStringLiteral
dateFunctions.add(new DatabaseFunction("SYSTIMESTAMP"));
//noinspection HardCodedStringLiteral
dateFunctions.add(new DatabaseFunction("CURRENT_TIMESTAMP"));
//noinspection HardCodedStringLiteral
super.sequenceNextValueFunction = "%s.nextval";
//noinspection HardCodedStringLiteral
super.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());
}
}
}
@Override
public int getDatabaseMajorVersion() throws DatabaseException {
if (databaseMajorVersion == null) {
return super.getDatabaseMajorVersion();
} else {
return databaseMajorVersion;
}
}
@Override
public int getDatabaseMinorVersion() throws DatabaseException {
if (databaseMinorVersion == null) {
return super.getDatabaseMinorVersion();
} else {
return databaseMinorVersion;
}
}
@Override
public String getJdbcCatalogName(CatalogAndSchema schema) {
return null;
}
@Override
public String getJdbcSchemaName(CatalogAndSchema schema) {
return correctObjectName((schema.getCatalogName() == null) ? schema.getSchemaName() : schema.getCatalogName(), Schema.class);
}
@Override
protected 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);
}
@Override
public String generatePrimaryKeyName(String tableName) {
if (tableName.length() > 27) {
//noinspection HardCodedStringLiteral
return "PK_" + tableName.toUpperCase(Locale.US).substring(0, 27);
} else {
//noinspection HardCodedStringLiteral
return "PK_" + tableName.toUpperCase(Locale.US);
}
}
@Override
public boolean isReservedWord(String objectName) {
return reservedWords.contains(objectName.toUpperCase());
}
@Override
public boolean supportsSequences() {
return true;
}
/**
* Oracle supports catalogs in liquibase terms
*
* @return false
*/
@Override
public boolean supportsSchemas() {
return false;
}
@Override
protected String getConnectionCatalogName() throws DatabaseException {
if (getConnection() instanceof OfflineConnection) {
return getConnection().getCatalog();
}
try {
//noinspection HardCodedStringLiteral
return 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 HardCodedStringLiteral
Scope.getCurrentScope().getLog(getClass()).info("Error getting default schema", e);
}
return null;
}
@Override
public String getDefaultCatalogName() {//NOPMD
return (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>
*/
@Override
public 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;
}
@Override
public boolean isSystemObject(DatabaseObject example) {
if (example == null) {
return false;
}
if (this.isLiquibaseObject(example)) {
return false;
}
if (example instanceof Schema) {
//noinspection HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral
if ("SYSTEM".equals(example.getName()) || "SYS".equals(example.getName()) || "CTXSYS".equals(example.getName()) || "XDB".equals(example.getName())) {
return true;
}
//noinspection HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral
if ("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,HardCodedStringLiteral
if (("SYSTEM".equals(example.getName()) || "SYS".equals(example.getName()) || "CTXSYS".equals(example.getName()) || "XDB".equals(example.getName()))) {
return true;
}
} else if (example.getName() != null) {
//noinspection HardCodedStringLiteral
if (example.getName().startsWith("BIN$")) { //oracle deleted table
boolean filteredInOriginalQuery = this.canAccessDbaRecycleBin();
if (!filteredInOriginalQuery) {
filteredInOriginalQuery = StringUtil.trimToEmpty(example.getSchema().getName()).equalsIgnoreCase(this.getConnection().getConnectionUserName());
}
if (filteredInOriginalQuery) {
return !((example instanceof PrimaryKey) || (example instanceof Index) || (example instanceof
liquibase.statement.UniqueConstraint));
} else {
return true;
}
} else //noinspection HardCodedStringLiteral
if (example.getName().startsWith("AQ$")) { //oracle AQ tables
return true;
} else //noinspection HardCodedStringLiteral
if (example.getName().startsWith("DR$")) { //oracle index tables
return true;
} else //noinspection HardCodedStringLiteral
if (example.getName().startsWith("SYS_IOT_OVER")) { //oracle system table
return true;
} else //noinspection HardCodedStringLiteral,HardCodedStringLiteral
if ((example.getName().startsWith("MDRT_") || example.getName().startsWith("MDRS_")) && example.getName().endsWith("$")) {
// CORE-1768 - Oracle creates these for spatial indices and will remove them when the index is removed.
return true;
} else //noinspection HardCodedStringLiteral
if (example.getName().startsWith("MLOG$_")) { //Created by materliaized view logs for every table that is part of a materialized view. Not available for DDL operations.
return true;
} else //noinspection HardCodedStringLiteral
if (example.getName().startsWith("RUPD$_")) { //Created by materialized view log tables using primary keys. Not available for DDL operations.
return true;
} else //noinspection HardCodedStringLiteral
if (example.getName().startsWith("WM$_")) { //Workspace Manager backup tables.
return true;
} else //noinspection HardCodedStringLiteral
if ("CREATE$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 HardCodedStringLiteral
if ("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 HardCodedStringLiteral
if (example.getName().startsWith("ISEQ$$_")) { //System-generated sequence
return true;
} else //noinspection HardCodedStringLiteral
if (example.getName().startsWith("USLOG$")) { //for update materialized view
return true;
} else if (example.getName().startsWith("SYS_FBA")) { //for Flashback tables
return true;
}
}
return super.isSystemObject(example);
}
@Override
public boolean supportsAutoIncrement() {
// Oracle supports Identity beginning with version 12c
boolean 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;
// }
@Override
public boolean supportsRestrictForeignKeys() {
return false;
}
@Override
public int getDataTypeMaxParameters(String dataTypeName) {
//noinspection HardCodedStringLiteral
if ("BINARY_FLOAT".equals(dataTypeName.toUpperCase())) {
return 0;
}
//noinspection HardCodedStringLiteral
if ("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 ") + ")";
}
@Override
public boolean jdbcCallsCatalogsSchemas() {
return true;
}
public Set<String> getUserDefinedTypes() {
if (userDefinedTypes == null) {
userDefinedTypes = new HashSet<>();
if ((getConnection() != null) && !(getConnection() instanceof OfflineConnection)) {
try {
try {
//noinspection HardCodedStringLiteral
userDefinedTypes.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 HardCodedStringLiteral
userDefinedTypes.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;
}
@Override
public String generateDatabaseFunctionValue(DatabaseFunction databaseFunction) {
//noinspection HardCodedStringLiteral
if ((databaseFunction != null) && "current_timestamp".equalsIgnoreCase(databaseFunction.toString())) {
return databaseFunction.toString();
}
if ((databaseFunction instanceof SequenceNextValueFunction) || (databaseFunction instanceof
SequenceCurrentValueFunction)) {
String quotedSeq = super.generateDatabaseFunctionValue(databaseFunction);
// replace "myschema.my_seq".nextval with "myschema"."my_seq".nextval
return quotedSeq.replaceFirst("\"([^\\.\"]+)\\.([^\\.\"]+)\"", "\"$1\".\"$2\"");
}
return super.generateDatabaseFunctionValue(databaseFunction);
}
@Override
public ValidationErrors validate() {
ValidationErrors errors = super.validate();
DatabaseConnection connection = getConnection();
if ((connection == null) || (connection instanceof OfflineConnection)) {
//noinspection HardCodedStringLiteral
Scope.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,HardCodedStringLiteral
return "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 HardCodedStringLiteral
if ((e instanceof SQLException) && e.getMessage().startsWith("ORA-00942")) { //ORA-00942: table or view does not exist
this.canAccessDbaRecycleBin = false;
} else {
//noinspection HardCodedStringLiteral
Scope.getCurrentScope().getLog(getClass()).warning("Cannot check dba_recyclebin access", e);
this.canAccessDbaRecycleBin = false;
}
} finally {
JdbcUtils.close(null, statement);
}
}
return canAccessDbaRecycleBin;
}
@Override
public 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);
}
}
}
OracleDatabase源码位置如下：
- 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，同理在java文件下创建BooleanType类，类的全路径为liquibase.datatype.core.BooleanType，将下面代码粘贴进去即可。
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//
package liquibase.datatype.core;
import java.util.Locale;
import liquibase.change.core.LoadDataChange.LOAD_DATA_TYPE;
import liquibase.database.Database;
import liquibase.database.core.DmDatabase;
import liquibase.database.core.*;
import liquibase.datatype.DataTypeInfo;
import liquibase.datatype.DatabaseDataType;
import liquibase.datatype.LiquibaseDataType;
import liquibase.exception.UnexpectedLiquibaseException;
import liquibase.statement.DatabaseFunction;
import liquibase.util.StringUtil;
@DataTypeInfo(
name = "boolean",
aliases = {"java.sql.Types.BOOLEAN", "java.lang.Boolean", "bit", "bool"},
minParameters = 0,
maxParameters = 0,
priority = 1
)
public class BooleanType extends LiquibaseDataType {
public BooleanType() {
}
public 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");
else
return 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);
}
public String objectToSql(Object value, Database database) {
if (value != null && !"null".equals(value.toString().toLowerCase(Locale.US))) {
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))) {
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))) {
throw new UnexpectedLiquibaseException("Unknown boolean value: " + value);
}
returnValue = this.getFalseBooleanValue(database);
} else {
returnValue = this.getTrueBooleanValue(database);
}
} else if (value instanceof Long) {
if (Long.valueOf(1L).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.getFalseBooleanValue(database);
} else {
returnValue = this.getTrueBooleanValue(database);
}
} else {
if (value instanceof DatabaseFunction) {
return value.toString();
}
if (!(value instanceof Boolean)) {
throw new UnexpectedLiquibaseException("Cannot convert type " + value.getClass() + " to a boolean value");
}
if ((Boolean)value) {
returnValue = this.getTrueBooleanValue(database);
} else {
returnValue = this.getFalseBooleanValue(database);
}
}
return returnValue;
} else {
return null;
}
}
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 instanceof
MSSQLDatabase) || (database instanceof MySQLDatabase) || (database instanceof OracleDatabase) ||
(database instanceof SQLiteDatabase) || (database instanceof SybaseASADatabase) || (database instanceof
SybaseDatabase) || (database instanceof DmDatabase);
}
public String getFalseBooleanValue(Database database) {
if (this.isNumericBoolean(database)) {
return "0";
} else {
return database instanceof InformixDatabase ? "'f'" : "FALSE";
}
}
public String getTrueBooleanValue(Database database) {
if (this.isNumericBoolean(database)) {
return "1";
} else {
return database instanceof InformixDatabase ? "'t'" : "TRUE";
}
}
public LOAD_DATA_TYPE getLoadTypeName() {
return LOAD_DATA_TYPE.BOOLEAN;
}
}
- 修改
resources/META-INF.services/liquibase.database.Database内容，添加DmDatabase支持liquibase.database.core.DmDatabase，同理在自己项目中的resources目录下创建对应的文件，粘贴对应的内容。
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
修改后项目中的结构如下，红框为新增项：
总结
在使用flowable集成达梦8时如果对启动项目生成flowable相关表没有需求的建议使用以下方案：
- 使用
DM数据迁移工具迁移表及数据，具体操作方式可以看我上一篇博客：数据迁移到DM8数据库教程。 - 迁移完毕后，可以导出
sql脚本，执行脚本来创建flowable相关表。
如果对自动生成表有要求的话，并且使用该博客方法无解，可以参考如下方案：
- 降低
Flwoable版本。 - 在
Flowable依赖中排除导致生成表错误的依赖，如果没有用到对应表的功能排除即可。 - 如果不能排除对应依赖，可以参考该博客
修改Flowable源码，第二步的操作来排查。
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