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/* * Copyright 2014 Feedzai * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.feedzai.commons.sql.abstraction.engine.impl; import com.feedzai.commons.sql.abstraction.ddl.*; import com.feedzai.commons.sql.abstraction.dml.dialect.Dialect; import com.feedzai.commons.sql.abstraction.dml.result.OracleResultIterator; import com.feedzai.commons.sql.abstraction.dml.result.ResultIterator; import com.feedzai.commons.sql.abstraction.engine.*; import com.feedzai.commons.sql.abstraction.engine.configuration.PdbProperties; import com.feedzai.commons.sql.abstraction.engine.handler.OperationFault; import com.feedzai.commons.sql.abstraction.entry.EntityEntry; import com.google.common.base.Optional; import com.google.common.base.Preconditions; import com.google.common.collect.ImmutableList; import oracle.jdbc.OraclePreparedStatement; import oracle.jdbc.OracleTypes; import java.io.StringReader; import java.sql.*; import java.util.ArrayList; import java.util.List; import java.util.Map; import static com.feedzai.commons.sql.abstraction.util.StringUtils.md5; import static com.feedzai.commons.sql.abstraction.util.StringUtils.quotize; import static java.lang.String.format; import static org.apache.commons.lang.StringUtils.join; /** * Oracle specific database implementation. * * @author Rui Vilao (rui.vilao@feedzai.com) * @since 2.0.0 */ public class OracleEngine extends AbstractDatabaseEngine { /** * The Oracle JDBC driver. */ protected static final String ORACLE_DRIVER = DatabaseEngineDriver.ORACLE.driver(); /** * Name is already used by an existing object. */ public static final String NAME_ALREADY_EXISTS = "ORA-00955"; /** * Table can have only one primary key. */ public static final String TABLE_CAN_ONLY_HAVE_ONE_PRIMARY_KEY = "ORA-02260"; /** * Sequence does not exist. */ public static final String SEQUENCE_DOES_NOT_EXIST = "ORA-02289"; /** * Table or view does not exist. */ public static final String TABLE_OR_VIEW_DOES_NOT_EXIST = "ORA-00942"; /** * Foreign key already exists */ public static final String FOREIGN_ALREADY_EXISTS = "ORA-02275"; /** * Double instance for 0.0, so no Double instance is created whenever 0.0 is necessary. * * @since 2.1.4 */ private static Double ZERO = Double.valueOf(0.0); /** * Creates a new Oracle connection. * * @param properties The properties for the database connection. * @throws DatabaseEngineException When the connection fails. */ public OracleEngine(PdbProperties properties) throws DatabaseEngineException { super(ORACLE_DRIVER, properties, Dialect.ORACLE); } @Override public synchronized void setParameters(final String name, final Object... params) throws DatabaseEngineException, ConnectionResetException { for (int i = 0; i < params.length; i++) { params[i] = ensureNoUnderflow(params[i]); } super.setParameters(name, params); } @Override public synchronized void setParameter(final String name, final int index, final Object param) throws DatabaseEngineException, ConnectionResetException { super.setParameter(name, index, ensureNoUnderflow(param)); } @Override protected int entityToPreparedStatement(final DbEntity entity, final PreparedStatement ps, final EntityEntry entry, final boolean useAutoInc) throws DatabaseEngineException { int i = 1; for (DbColumn column : entity.getColumns()) { if (column.isAutoInc() && useAutoInc) { continue; } try { final Object val; if (column.isDefaultValueSet() && !entry.containsKey(column.getName())) { val = column.getDefaultValue().getConstant(); } else { val = entry.get(column.getName()); } switch (column.getDbColumnType()) { case BLOB: ps.setBytes(i, objectToArray(val)); break; case CLOB: if (val == null) { ps.setNull(i, Types.CLOB); break; } if (val instanceof String) { StringReader sr = new StringReader((String) val); ps.setClob(i, sr); } else { throw new DatabaseEngineException("Cannot convert " + val.getClass().getSimpleName() + " to String. CLOB columns only accept Strings."); } break; case BOOLEAN: Boolean b = (Boolean) val; if (b == null) { ps.setObject(i, null); } else if (b) { ps.setObject(i, "1"); } else { ps.setObject(i, "0"); } break; default: ps.setObject(i, ensureNoUnderflow(val)); } } catch (Exception ex) { throw new DatabaseEngineException("Error while mapping variables to database", ex); } i++; } return i - 1; } /** * Returns 0.0 if the provided value is a double and less than 1.0e-131, since values * under 1.0e-131 causes an underflow error in the jdbc driver. * * @param val The value to check * @return The value corrected in case val is less than 1.0e-131, unchanged otherwise. * * @since 2.1.4 */ private Object ensureNoUnderflow(Object val) { if (val instanceof Double) { Double dblVal = (Double) val; if (Math.abs(dblVal) <= 1.0e-131) { val = ZERO; } } return val; } /** * Overrides {@link com.feedzai.commons.sql.abstraction.engine.AbstractDatabaseEngine#setTransactionIsolation()} This is because * Oracle does not support READ_UNCOMMITTED e REPEATABLE_READ. * * @throws SQLException If a database access error occurs. */ @Override protected void setTransactionIsolation() throws SQLException { int isolation = properties.getIsolationLevel(); if (isolation == Connection.TRANSACTION_READ_UNCOMMITTED) { isolation = Connection.TRANSACTION_READ_COMMITTED; } if (isolation == Connection.TRANSACTION_REPEATABLE_READ) { isolation = Connection.TRANSACTION_SERIALIZABLE; } conn.setTransactionIsolation(isolation); } @Override public Class<? extends AbstractTranslator> getTranslatorClass() { return OracleTranslator.class; } @Override protected void createTable(final DbEntity entity) throws DatabaseEngineException { List<String> createTable = new ArrayList<String>(); createTable.add("CREATE TABLE"); createTable.add(quotize(entity.getName())); List<String> columns = new ArrayList<String>(); for (DbColumn c : entity.getColumns()) { List<String> column = new ArrayList<String>(); column.add(quotize(c.getName())); column.add(translateType(c)); if (c.isDefaultValueSet() && !c.getDbColumnType().equals(DbColumnType.BOOLEAN)) { column.add("DEFAULT"); column.add(translate(c.getDefaultValue())); } for (DbColumnConstraint cc : c.getColumnConstraints()) { column.add(cc.translate()); } columns.add(join(column, " ")); } createTable.add("(" + join(columns, ", ") + ")"); // segment creation deferred can cause unexpected behaviour in sequences // see: http://dirknachbar.blogspot.pt/2011/01/deferred-segment-creation-under-oracle.html createTable.add("SEGMENT CREATION IMMEDIATE"); final String createTableStatement = join(createTable, " "); logger.trace(createTableStatement); Statement s = null; try { s = conn.createStatement(); s.executeUpdate(createTableStatement); } catch (SQLException ex) { if (ex.getMessage().startsWith(NAME_ALREADY_EXISTS)) { logger.debug(dev, "'{}' is already defined", entity.getName()); handleOperation(new OperationFault(entity.getName(), OperationFault.Type.TABLE_ALREADY_EXISTS), ex); } else { throw new DatabaseEngineException("Something went wrong handling statement", ex); } } finally { try { if (s != null) { s.close(); } } catch (Exception e) { logger.trace("Error closing statement.", e); } } } @Override protected void addPrimaryKey(final DbEntity entity) throws DatabaseEngineException { if (entity.getPkFields().size() == 0) { return; } List<String> pks = new ArrayList<String>(); for (String pk : entity.getPkFields()) { pks.add(quotize(pk)); } final String pkName = md5(format("PK_%s", entity.getName()), properties.getMaxIdentifierSize()); List<String> statement = new ArrayList<String>(); statement.add("ALTER TABLE"); statement.add(quotize(entity.getName())); statement.add("ADD CONSTRAINT"); statement.add(quotize(pkName)); statement.add("PRIMARY KEY"); statement.add("(" + join(pks, ", ") + ")"); final String addPrimaryKey = join(statement, " "); logger.trace(addPrimaryKey); Statement s = null; try { s = conn.createStatement(); s.executeUpdate(addPrimaryKey); } catch (SQLException ex) { if (ex.getMessage().startsWith(TABLE_CAN_ONLY_HAVE_ONE_PRIMARY_KEY)) { logger.debug(dev, "'{}' already has a primary key", entity.getName()); handleOperation( new OperationFault(entity.getName(), OperationFault.Type.PRIMARY_KEY_ALREADY_EXISTS), ex); } else { throw new DatabaseEngineException("Something went wrong handling statement", ex); } } finally { try { if (s != null) { s.close(); } } catch (Exception e) { logger.trace("Error closing statement.", e); } } } @Override protected void addIndexes(final DbEntity entity) throws DatabaseEngineException { List<DbIndex> indexes = entity.getIndexes(); for (DbIndex index : indexes) { List<String> createIndex = new ArrayList<String>(); createIndex.add("CREATE"); if (index.isUnique()) { createIndex.add("UNIQUE"); } createIndex.add("INDEX"); List<String> columns = new ArrayList<String>(); List<String> columnsForName = new ArrayList<String>(); for (String column : index.getColumns()) { columns.add(quotize(column)); columnsForName.add(column); } final String idxName = md5(format("%s_%s_IDX", entity.getName(), join(columnsForName, "_")), properties.getMaxIdentifierSize()); createIndex.add(quotize(idxName)); createIndex.add("ON"); createIndex.add(quotize(entity.getName())); createIndex.add("(" + join(columns, ", ") + ")"); final String statement = join(createIndex, " "); logger.trace(statement); Statement s = null; try { s = conn.createStatement(); s.executeUpdate(statement); } catch (SQLException ex) { if (ex.getMessage().startsWith(NAME_ALREADY_EXISTS)) { logger.debug(dev, "'{}' is already defined", idxName); handleOperation(new OperationFault(entity.getName(), OperationFault.Type.INDEX_ALREADY_EXISTS), ex); } else { throw new DatabaseEngineException("Something went wrong handling statement", ex); } } finally { try { if (s != null) { s.close(); } } catch (Exception e) { logger.trace("Error closing statement.", e); } } } } @Override protected void addSequences(DbEntity entity) throws DatabaseEngineException { for (DbColumn column : entity.getColumns()) { if (!column.isAutoInc()) { continue; } final String sequenceName = md5(format("%s_%s_SEQ", entity.getName(), column.getName()), properties.getMaxIdentifierSize()); List<String> createSequence = new ArrayList<String>(); createSequence.add("CREATE SEQUENCE "); createSequence.add(quotize(sequenceName)); createSequence.add("MINVALUE 0"); createSequence.add("MAXVALUE"); switch (column.getDbColumnType()) { case INT: createSequence.add(format("%d", Integer.MAX_VALUE)); break; case LONG: createSequence.add(format("%d", Long.MAX_VALUE)); break; default: throw new DatabaseEngineException("Auto incrementation is only supported on INT and LONG"); } createSequence.add("START WITH 1"); createSequence.add("INCREMENT BY 1"); String statement = join(createSequence, " "); logger.trace(statement); Statement s = null; try { s = conn.createStatement(); s.executeUpdate(statement); } catch (SQLException ex) { if (ex.getMessage().startsWith(NAME_ALREADY_EXISTS)) { logger.debug(dev, "'{}' is already defined", sequenceName); handleOperation( new OperationFault(entity.getName(), OperationFault.Type.SEQUENCE_ALREADY_EXISTS), ex); } else { throw new DatabaseEngineException("Something went wrong handling statement", ex); } } finally { try { if (s != null) { s.close(); } } catch (Exception e) { logger.trace("Error closing statement.", e); } } } } @Override protected MappedEntity createPreparedStatementForInserts(final DbEntity entity) throws DatabaseEngineException { List<String> insertInto = new ArrayList<String>(); insertInto.add("INSERT INTO"); insertInto.add(quotize(entity.getName())); List<String> insertIntoWithAutoInc = new ArrayList<String>(); insertIntoWithAutoInc.add("INSERT INTO"); insertIntoWithAutoInc.add(quotize(entity.getName())); List<String> columns = new ArrayList<String>(); List<String> values = new ArrayList<String>(); List<String> columnsWithAutoInc = new ArrayList<String>(); List<String> valuesWithAutoInc = new ArrayList<String>(); String returning = null; for (DbColumn column : entity.getColumns()) { columnsWithAutoInc.add(quotize(column.getName())); valuesWithAutoInc.add("?"); columns.add(quotize(column.getName())); if (column.isAutoInc()) { final String sequenceName = md5(format("%s_%s_SEQ", entity.getName(), column.getName()), properties.getMaxIdentifierSize()); values.add(format("%s.nextval", quotize(sequenceName))); returning = column.getName(); } else { values.add("?"); } } insertInto.add("(" + join(columns, ", ") + ")"); insertInto.add("VALUES (" + join(values, ", ") + ")"); insertIntoWithAutoInc.add("(" + join(columnsWithAutoInc, ", ") + ")"); insertIntoWithAutoInc.add("VALUES (" + join(valuesWithAutoInc, ", ") + ")"); List<String> insertIntoReturn = new ArrayList<String>(insertInto); if (returning != null) { insertIntoReturn.add(format("RETURNING %s INTO ?", quotize(returning))); } else { insertIntoReturn.add("RETURNING 0 INTO ?"); } final String insertStatement = join(insertInto, " "); final String insertReturnStatement = join(insertIntoReturn, " "); final String insertWithAutoInc = join(insertIntoWithAutoInc, " "); logger.trace(insertStatement); logger.trace(insertReturnStatement); PreparedStatement ps, psReturn, psWithAutoInc; try { ps = conn.prepareStatement(insertStatement); psReturn = conn.prepareStatement(insertReturnStatement); psWithAutoInc = conn.prepareStatement(insertWithAutoInc); return new MappedEntity().setInsert(ps).setInsertReturning(psReturn).setInsertWithAutoInc(psWithAutoInc) .setAutoIncColumn(returning); } catch (SQLException ex) { throw new DatabaseEngineException("Something went wrong handling statement", ex); } } @Override protected void dropSequences(DbEntity entity) throws DatabaseEngineException { for (DbColumn column : entity.getColumns()) { if (!column.isAutoInc()) { continue; } final String sequenceName = md5(format("%s_%s_SEQ", entity.getName(), column.getName()), properties.getMaxIdentifierSize()); final String stmt = format("DROP SEQUENCE %s", quotize(sequenceName)); Statement drop = null; try { drop = conn.createStatement(); logger.trace(stmt); drop.executeUpdate(stmt); } catch (SQLException ex) { if (ex.getMessage().startsWith(SEQUENCE_DOES_NOT_EXIST)) { logger.debug(dev, "Sequence '{}' does not exist", sequenceName); handleOperation( new OperationFault(entity.getName(), OperationFault.Type.SEQUENCE_DOES_NOT_EXIST), ex); } else { throw new DatabaseEngineException("Error dropping sequence", ex); } } finally { try { if (drop != null) { drop.close(); } } catch (Exception e) { logger.trace("Error closing statement.", e); } } } } @Override protected void dropTable(DbEntity entity) throws DatabaseEngineException { Statement drop = null; try { drop = conn.createStatement(); final String query = format("DROP TABLE %s CASCADE CONSTRAINTS", quotize(entity.getName())); logger.trace(query); drop.executeUpdate(query); } catch (SQLException ex) { if (ex.getMessage().startsWith(TABLE_OR_VIEW_DOES_NOT_EXIST)) { logger.debug(dev, "Table '{}' does not exist", entity.getName()); handleOperation(new OperationFault(entity.getName(), OperationFault.Type.TABLE_DOES_NOT_EXIST), ex); } else { throw new DatabaseEngineException("Error dropping table", ex); } } finally { try { if (drop != null) { drop.close(); } } catch (Exception e) { logger.trace("Error closing statement.", e); } } } @Override protected void dropColumn(DbEntity entity, String... columns) throws DatabaseEngineException { Statement drop = null; List<String> removeColumns = new ArrayList<String>(); removeColumns.add("ALTER TABLE"); removeColumns.add(quotize(entity.getName())); removeColumns.add("DROP"); List<String> cols = new ArrayList<String>(); for (String col : columns) { cols.add(quotize(col)); } removeColumns.add("( " + join(cols, ",") + " )"); try { drop = conn.createStatement(); final String query = join(removeColumns, " "); logger.trace(query); drop.executeUpdate(query); } catch (SQLException ex) { if (ex.getMessage().startsWith(TABLE_OR_VIEW_DOES_NOT_EXIST)) { logger.debug(dev, "Table '{}' does not exist", entity.getName()); handleOperation(new OperationFault(entity.getName(), OperationFault.Type.COLUMN_DOES_NOT_EXIST), ex); } else { throw new DatabaseEngineException("Error dropping column", ex); } } finally { try { if (drop != null) { drop.close(); } } catch (Exception e) { logger.trace("Error closing statement.", e); } } } @Override protected void addColumn(DbEntity entity, DbColumn... columns) throws DatabaseEngineException { List<String> addColumns = new ArrayList<String>(); addColumns.add("ALTER TABLE"); addColumns.add(quotize(entity.getName())); addColumns.add("ADD"); List<String> cols = new ArrayList<String>(); for (DbColumn c : columns) { List<String> column = new ArrayList<String>(); column.add(quotize(c.getName())); column.add(translateType(c)); if (c.isDefaultValueSet() && !c.getDbColumnType().equals(DbColumnType.BOOLEAN)) { column.add("DEFAULT"); column.add(translate(c.getDefaultValue())); } for (DbColumnConstraint cc : c.getColumnConstraints()) { column.add(cc.translate()); } cols.add(join(column, " ")); } addColumns.add("( " + join(cols, ",") + " )"); final String addColumnsStatement = join(addColumns, " "); logger.trace(addColumnsStatement); Statement s = null; try { s = conn.createStatement(); s.executeUpdate(addColumnsStatement); } catch (SQLException ex) { throw new DatabaseEngineException("Something went wrong handling statement", ex); } finally { try { if (s != null) { s.close(); } } catch (Exception e) { logger.trace("Error closing statement.", e); } } } @Override protected String translateType(DbColumn c) throws DatabaseEngineException { return translator.translate(c); } @Override public synchronized Long persist(final String name, final EntityEntry entry) throws DatabaseEngineException { return persist(name, entry, true); } @Override public synchronized Long persist(String name, EntityEntry entry, boolean useAutoInc) throws DatabaseEngineException { ResultSet generatedKeys = null; try { getConnection(); final MappedEntity me = entities.get(name); if (me == null) { throw new DatabaseEngineException(String.format("Unknown entity '%s'", name)); } PreparedStatement ps = null; if (useAutoInc) { ps = me.getInsertReturning(); synchronizeSequence(name, me); } else { ps = me.getInsertWithAutoInc(); } int i = entityToPreparedStatement(me.getEntity(), ps, entry, useAutoInc); if (useAutoInc) { ((OraclePreparedStatement) ps).registerReturnParameter(i + 1, OracleTypes.NUMBER); } ps.execute(); long ret = 0; if (useAutoInc) { generatedKeys = ((OraclePreparedStatement) ps).getReturnResultSet(); if (generatedKeys.next()) { ret = generatedKeys.getLong(1); } generatedKeys.close(); } else { me.setSequenceDirty(true); } return ret == 0 ? null : ret; } catch (Exception ex) { throw new DatabaseEngineException("Something went wrong persisting the entity", ex); } finally { try { if (generatedKeys != null) { generatedKeys.close(); } } catch (Exception e) { logger.trace("Error closing result set.", e); } } } /** * Synchronizes the given sequence to the current value. * * @param name The table name that the sequence belongs. * @param me The mapped entity. */ private void synchronizeSequence(String name, MappedEntity me) { if (!me.isSequenceDirty()) { return; } final String sequenceName = md5(format("%s_%s_SEQ", name, me.getAutoIncColumn()), properties.getMaxIdentifierSize()); // Touch the sequence. final List<String> touch = ImmutableList.of( String.format("SELECT %s.NEXTVAL FROM DUAL", quotize(sequenceName)), String.format("ALTER SEQUENCE %s INCREMENT BY -1", quotize(sequenceName)), String.format("SELECT %s.NEXTVAL FROM DUAL", quotize(sequenceName)), String.format("ALTER SEQUENCE %s INCREMENT BY 1", quotize(sequenceName))); silentlyExecuteStatements(touch); // Event if there are no entries in the table, the operation is evaluated as NULL so it's safe. final String sqlDiff = String.format("SELECT (SELECT MAX(%s) FROM %s) - %s.CURRVAL FROM DUAL", quotize(me.getAutoIncColumn()), quotize(name), quotize(sequenceName)); logger.trace(dev, "{}", sqlDiff); try (Statement statementDiffSeq = conn.createStatement(); ResultSet diff = statementDiffSeq.executeQuery(sqlDiff);) { if (diff.next()) { final long diffLong = diff.getObject(1) != null ? diff.getLong(1) : -1L; if (diffLong > 0) { final List<String> stmts = ImmutableList.of( String.format("ALTER SEQUENCE %s INCREMENT BY %s", quotize(sequenceName), diffLong), String.format("SELECT %s.NEXTVAL FROM DUAL", quotize(sequenceName)), String.format("ALTER SEQUENCE %s INCREMENT BY 1", quotize(sequenceName))); silentlyExecuteStatements(stmts); } } me.setSequenceDirty(false); } catch (SQLException e) { logger.debug("Error querying.", e); } catch (Exception e) { logger.debug("Error closing resources.", e); } } /** * Executes the given list of statements silently, i.e. there's no control over failures. * * @param stmts The list of statements to execute. */ private void silentlyExecuteStatements(List<String> stmts) { for (String stmt : stmts) { try (Statement statementSyncSequence = conn.createStatement();) { logger.trace(dev, "{}", stmt); statementSyncSequence.execute(stmt); } catch (SQLException e) { logger.debug("Error executing statement.", e); } catch (Exception e) { logger.debug("Error closing statement.", e); } } } @Override protected void addFks(DbEntity entity) throws DatabaseEngineException { for (DbFk fk : entity.getFks()) { final List<String> quotizedLocalColumns = new ArrayList<String>(); for (String s : fk.getLocalColumns()) { quotizedLocalColumns.add(quotize(s)); } final List<String> quotizedForeignColumns = new ArrayList<String>(); for (String s : fk.getForeignColumns()) { quotizedForeignColumns.add(quotize(s)); } final String table = quotize(entity.getName()); final String quotizedLocalColumnsSting = join(quotizedLocalColumns, ", "); final String quotizedForeignColumnsString = join(quotizedForeignColumns, ", "); final String alterTable = format("ALTER TABLE %s ADD CONSTRAINT %s FOREIGN KEY (%s) REFERENCES %s (%s)", table, quotize(md5("FK_" + table + quotizedLocalColumnsSting + quotizedForeignColumnsString, properties.getMaxIdentifierSize())), quotizedLocalColumnsSting, quotize(fk.getForeignTable()), quotizedForeignColumnsString); Statement alterTableStmt = null; try { alterTableStmt = conn.createStatement(); logger.trace(alterTable); alterTableStmt.executeUpdate(alterTable); } catch (SQLException ex) { if (ex.getMessage().startsWith(FOREIGN_ALREADY_EXISTS)) { logger.debug(dev, "Foreign key for table '{}' already exists. Error code: {}.", entity.getName(), ex.getMessage(), ex); handleOperation( new OperationFault(entity.getName(), OperationFault.Type.FOREIGN_KEY_ALREADY_EXISTS), ex); } else { throw new DatabaseEngineException( format("Could not add Foreign Key to entity %s. Error code: %s.", entity.getName(), ex.getMessage()), ex); } } finally { try { if (alterTableStmt != null) { alterTableStmt.close(); } } catch (Exception e) { logger.trace("Error closing statement.", e); } } } } @Override protected boolean checkConnection(final Connection conn) { Statement s = null; try { s = conn.createStatement(); s.executeQuery("select 1 from dual"); return true; } catch (SQLException e) { logger.debug("Connection is down.", e); return false; } finally { try { if (s != null) { s.close(); } } catch (Exception e) { logger.trace("Error closing statement.", e); } } } /** * Gets the schema. This implementation uses the username when the schema is null. * * @return The schema or the username when the first is null. */ @Override protected String getSchema() { return Optional.fromNullable(super.getSchema()).or(properties.getUsername()); } @Override public synchronized Map<String, DbColumnType> getMetadata(final String name) throws DatabaseEngineException { // start with the default implementation. Then override some definitions here. final Map<String, DbColumnType> metaMap = super.getMetadata(name); Statement s = null; ResultSet rsColumns = null; try { getConnection(); s = conn.createStatement(); rsColumns = s.executeQuery(String.format( "SELECT COLUMN_NAME, DATA_TYPE, DATA_PRECISION FROM ALL_TAB_COLS WHERE TABLE_NAME = '%s' AND OWNER = UPPER('%s')", name, properties.getProperty(PdbProperties.USERNAME))); while (rsColumns.next()) { String columnName = rsColumns.getString("COLUMN_NAME"); /* Columns starting with SYS_ are Oracle system-generated columns and PDB should not interfere with these columns. Not storing these in the metaMap makes them invisible to PDB. See: http://docs.oracle.com/cd/B19306_01/server.102/b14200/ap_keywd.htm */ if (!columnName.toUpperCase().startsWith("SYS_")) { final String dataPrecision = rsColumns.getString("DATA_PRECISION"); final DbColumnType value = toPdbType(dataPrecision == null ? rsColumns.getString("DATA_TYPE") : (rsColumns.getString("DATA_TYPE") + dataPrecision)); if (value != DbColumnType.UNMAPPED) { metaMap.put(columnName, value); } } } return metaMap; } catch (Exception e) { throw new DatabaseEngineException("Could not get metadata", e); } finally { try { if (rsColumns != null) { rsColumns.close(); } } catch (Exception a) { logger.trace("Error closing result set.", a); } try { if (s != null) { s.close(); } } catch (Exception a) { logger.trace("Error closing statement.", a); } } } private DbColumnType toPdbType(String type) { /** * We want to override the default mappings depending on number precision. */ Preconditions.checkNotNull(type, "Type cannot be null."); switch (type) { case "NUMBER": return DbColumnType.INT; case "CHAR": return DbColumnType.BOOLEAN; case "FLOAT": case "FLOAT126": return DbColumnType.DOUBLE; case "LONG": case "NUMBER19": return DbColumnType.LONG; case "VARCHAR2": case "NVARCHAR2": return DbColumnType.STRING; case "CLOB": return DbColumnType.CLOB; case "BLOB": return DbColumnType.BLOB; default: return DbColumnType.UNMAPPED; } } @Override protected ResultIterator createResultIterator(Statement statement, String sql) throws DatabaseEngineException { return new OracleResultIterator(statement, sql); } @Override protected ResultIterator createResultIterator(PreparedStatement ps) throws DatabaseEngineException { return new OracleResultIterator(ps); } }