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package liquibase.database.core;
import liquibase.CatalogAndSchema;
import liquibase.GlobalConfiguration;
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.RawParameterizedSqlStatement;
import liquibase.structure.DatabaseObject;
import liquibase.structure.core.*;
import liquibase.util.JdbcUtil;
import liquibase.util.StringUtil;
import org.apache.commons.lang3.StringUtils;
import java.lang.reflect.Method;
import java.sql.*;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import static java.util.ResourceBundle.getBundle;
/**
* Encapsulates Oracle database support.
*/
public class OracleDatabase extends AbstractJdbcDatabase {
private static final String PROXY_USER_REGEX = ".*(?:thin|oci)\\:(.+)/@.*";
public static final Pattern PROXY_USER_PATTERN = Pattern.compile(PROXY_USER_REGEX);
private static final String VERSION_REGEX = "(\\d+)\\.(\\d+)\\..*";
private static final Pattern VERSION_PATTERN = Pattern.compile(VERSION_REGEX);
public static final String PRODUCT_NAME = "oracle";
private static final ResourceBundle coreBundle = getBundle("liquibase/i18n/liquibase-core");
protected final int SHORT_IDENTIFIERS_LENGTH = 30;
protected final int LONG_IDENTIFIERS_LEGNTH = 128;
public static final int ORACLE_12C_MAJOR_VERSION = 12;
public static final int ORACLE_23C_MAJOR_VERSION = 23;
private final Set reservedWords = new HashSet<>();
private Set userDefinedTypes;
private Map savedSessionNlsSettings;
private Boolean canAccessDbaRecycleBin;
private Integer databaseMajorVersion;
private Integer databaseMinorVersion;
/**
* Default constructor for an object that represents the Oracle Database DBMS.
*/
public OracleDatabase() {
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";
}
@Override
public int getPriority() {
return PRIORITY_DEFAULT;
}
private void tryProxySession(final String url, final Connection con) {
Matcher m = PROXY_USER_PATTERN.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());
return;
}
try {
Method method = con.getClass().getMethod("isProxySession");
method.setAccessible(true);
boolean b = (boolean)method.invoke(con);
if (! b) {
Scope.getCurrentScope().getLog(getClass()).info("Proxy session not established on OracleDatabase: ");
}
} catch (Exception e) {
Scope.getCurrentScope().getLog(getClass()).info("Could not open proxy session on OracleDatabase: " + e.getCause().getMessage());
}
}
}
@Override
public void setConnection(DatabaseConnection conn) {
//noinspection HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral,
// HardCodedStringLiteral
reservedWords.addAll(Arrays.asList("GROUP", "USER", "SESSION", "PASSWORD", "RESOURCE", "START", "SIZE", "UID", "DESC", "ORDER")); //more reserved words not returned by driver
Connection sqlConn = null;
if (!(conn instanceof OfflineConnection)) {
try {
/*
* Don't try to call getWrappedConnection if the conn instance is
* is not a JdbcConnection. This happens for OfflineConnection.
* see https://liquibase.jira.com/browse/CORE-2192
*/
if (conn instanceof JdbcConnection) {
sqlConn = ((JdbcConnection) conn).getWrappedConnection();
}
} catch (Exception e) {
throw new UnexpectedLiquibaseException(e);
}
if (sqlConn != null) {
tryProxySession(conn.getURL(), sqlConn);
try {
//noinspection HardCodedStringLiteral
reservedWords.addAll(Arrays.asList(sqlConn.getMetaData().getSQLKeywords().toUpperCase().split(",\\s*")));
} catch (SQLException e) {
//noinspection HardCodedStringLiteral
Scope.getCurrentScope().getLog(getClass()).info("Could get sql keywords on OracleDatabase: " + e.getMessage());
//can not get keywords. Continue on
}
try {
Method method = sqlConn.getClass().getMethod("setRemarksReporting", Boolean.TYPE);
method.setAccessible(true);
method.invoke(sqlConn, true);
} catch (Exception e) {
//noinspection HardCodedStringLiteral
Scope.getCurrentScope().getLog(getClass()).info("Could not set remarks reporting on OracleDatabase: " + e.getMessage());
//cannot set it. That is OK
}
CallableStatement statement = null;
try {
//noinspection HardCodedStringLiteral
statement = sqlConn.prepareCall("{call DBMS_UTILITY.DB_VERSION(?,?)}");
statement.registerOutParameter(1, Types.VARCHAR);
statement.registerOutParameter(2, Types.VARCHAR);
statement.execute();
String compatibleVersion = statement.getString(2);
if (compatibleVersion != null) {
Matcher majorVersionMatcher = VERSION_PATTERN.matcher(compatibleVersion);
if (majorVersionMatcher.matches()) {
this.databaseMajorVersion = Integer.valueOf(majorVersionMatcher.group(1));
this.databaseMinorVersion = Integer.valueOf(majorVersionMatcher.group(2));
}
}
} catch (SQLException e) {
@SuppressWarnings("HardCodedStringLiteral") String message = "Cannot read from DBMS_UTILITY.DB_VERSION: " + e.getMessage();
//noinspection HardCodedStringLiteral
Scope.getCurrentScope().getLog(getClass()).info("Could not set check compatibility mode on OracleDatabase, assuming not running in any sort of compatibility mode: " + message);
} finally {
JdbcUtil.closeStatement(statement);
}
if (GlobalConfiguration.DDL_LOCK_TIMEOUT.getCurrentValue() != null) {
int timeoutValue = GlobalConfiguration.DDL_LOCK_TIMEOUT.getCurrentValue();
Scope.getCurrentScope().getLog(getClass()).fine("Setting DDL_LOCK_TIMEOUT value to " + timeoutValue);
String sql = "ALTER SESSION SET DDL_LOCK_TIMEOUT=" + timeoutValue;
PreparedStatement ddlLockTimeoutStatement = null;
try {
ddlLockTimeoutStatement = sqlConn.prepareStatement(sql);
ddlLockTimeoutStatement.execute();
} catch (SQLException sqle) {
Scope.getCurrentScope().getUI().sendErrorMessage("Unable to set the DDL_LOCK_TIMEOUT_VALUE: " + sqle.getMessage(), sqle);
Scope.getCurrentScope().getLog(getClass()).warning("Unable to set the DDL_LOCK_TIMEOUT_VALUE: " + sqle.getMessage(), sqle);
} finally {
JdbcUtil.closeStatement(ddlLockTimeoutStatement);
}
}
}
}
super.setConnection(conn);
}
@Override
public String getShortName() {
//noinspection HardCodedStringLiteral
return "oracle";
}
@Override
protected String getDefaultDatabaseProductName() {
//noinspection HardCodedStringLiteral
return "Oracle";
}
@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 Integer getDefaultPort() {
return 1521;
}
@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 (StringUtils.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) {
int maximumLength = getIdentifierMaximumLength();
String primaryKeyName = "PK_" + tableName.toUpperCase(Locale.US);
if (primaryKeyName.length() > maximumLength) {
return primaryKeyName.substring(0, maximumLength);
} else {
return primaryKeyName;
}
}
@Override
public boolean supportsInitiallyDeferrableColumns() {
return true;
}
@Override
public boolean isReservedWord(String objectName) {
return reservedWords.contains(objectName.toUpperCase());
}
@Override
public boolean supportsSequences() {
return true;
}
@Override
public boolean supports(Class object) {
if (Schema.class.isAssignableFrom(object)) {
return false;
}
return super.supports(object);
}
/**
* 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();
}
if (!(getConnection() instanceof JdbcConnection)) {
return defaultCatalogName;
}
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 boolean isCorrectDatabaseImplementation(DatabaseConnection conn) throws DatabaseException {
return PRODUCT_NAME.equalsIgnoreCase(conn.getDatabaseProductName());
}
@Override
public String getDefaultDriver(String url) {
//noinspection HardCodedStringLiteral
if (url.startsWith("jdbc:oracle")) {
return "oracle.jdbc.OracleDriver";
}
return null;
}
@Override
public String getDefaultCatalogName() {//NOPMD
String defaultCatalogName = super.getDefaultCatalogName();
if (Boolean.TRUE.equals(GlobalConfiguration.PRESERVE_SCHEMA_CASE.getCurrentValue())) {
return defaultCatalogName;
}
return (defaultCatalogName == null) ? null : defaultCatalogName.toUpperCase(Locale.US);
}
/**
* Returns an Oracle date literal with the same value as a string formatted using ISO 8601.
*
* 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')
*
* Implementation restriction:
* Currently, only the following subsets of ISO8601 are supported:
*
* - YYYY-MM-DD
* - YYYY-MM-DDThh:mm:ss
*
*/
@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$$_")) { //System-generated sequence
return true;
} else //noinspection HardCodedStringLiteral
if (example.getName().startsWith("USLOG$")) { //for update materialized view
return true;
} else if (example.getName().startsWith("SYS_FBA")) { //for Flashback tables
return true;
}
}
return super.isSystemObject(example);
}
@Override
public boolean supportsTablespaces() {
return true;
}
@Override
public boolean supportsAutoIncrement() {
// Oracle supports Identity beginning with version 12c
boolean isAutoIncrementSupported = false;
try {
if (getDatabaseMajorVersion() >= 12) {
isAutoIncrementSupported = true;
}
// Returning true will generate create table command with 'IDENTITY' clause, example:
// CREATE TABLE AutoIncTest (IDPrimaryKey NUMBER(19) GENERATED BY DEFAULT AS IDENTITY NOT NULL, TypeID NUMBER(3) NOT NULL, Description NVARCHAR2(50), CONSTRAINT PK_AutoIncTest PRIMARY KEY (IDPrimaryKey));
// While returning false will continue to generate create table command without 'IDENTITY' clause, example:
// CREATE TABLE AutoIncTest (IDPrimaryKey NUMBER(19) NOT NULL, TypeID NUMBER(3) NOT NULL, Description NVARCHAR2(50), CONSTRAINT PK_AutoIncTest PRIMARY KEY (IDPrimaryKey));
} catch (DatabaseException ex) {
isAutoIncrementSupported = false;
}
return isAutoIncrementSupported;
}
@Override
public boolean supportsRestrictForeignKeys() {
return false;
}
@Override
public int getDataTypeMaxParameters(String dataTypeName) {
//noinspection HardCodedStringLiteral
if ("BINARY_FLOAT".equals(dataTypeName.toUpperCase())) {
return 0;
}
//noinspection HardCodedStringLiteral
if ("BINARY_DOUBLE".equals(dataTypeName.toUpperCase())) {
return 0;
}
return super.getDataTypeMaxParameters(dataTypeName);
}
public String getSystemTableWhereClause(String tableNameColumn) {
List clauses = new ArrayList<>(Arrays.asList("BIN$",
"AQ$",
"DR$",
"SYS_IOT_OVER",
"MLOG$_",
"RUPD$_",
"WM$_",
"ISEQ$$_",
"USLOG$",
"SYS_FBA"));
clauses.replaceAll(s -> tableNameColumn + " NOT LIKE '" + s + "%'");
return "("+ StringUtil.join(clauses, " AND ") + ")";
}
@Override
public boolean jdbcCallsCatalogsSchemas() {
return true;
}
public Set 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 RawParameterizedSqlStatement("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 RawParameterizedSqlStatement("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 {
JdbcUtil.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 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);
}
}
@Override
public boolean supportsDatabaseChangeLogHistory() {
return true;
}
@Override
public String correctObjectName(String objectName, Class objectType) {
// Internally Oracle converts int/integer to number, so when we need to extract and compare it we need number too
if (objectType.equals(Column.class) && StringUtils.startsWithIgnoreCase(objectName, "int")) {
return "NUMBER(*, 0)";
}
return super.correctObjectName(objectName, objectType);
}
}