| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.flink.connector.jdbc.databases.oracle.dialect; |
| |
| import org.apache.flink.annotation.Internal; |
| import org.apache.flink.connector.jdbc.converter.JdbcRowConverter; |
| import org.apache.flink.connector.jdbc.dialect.AbstractDialect; |
| import org.apache.flink.table.types.logical.LogicalTypeRoot; |
| import org.apache.flink.table.types.logical.RowType; |
| |
| import java.util.Arrays; |
| import java.util.EnumSet; |
| import java.util.Optional; |
| import java.util.Set; |
| import java.util.stream.Collectors; |
| |
| /** JDBC dialect for Oracle. */ |
| @Internal |
| public class OracleDialect extends AbstractDialect { |
| |
| private static final long serialVersionUID = 1L; |
| |
| // Define MAX/MIN precision of TIMESTAMP type according to Oracle docs: |
| // https://www.techonthenet.com/oracle/datatypes.php |
| private static final int MAX_TIMESTAMP_PRECISION = 9; |
| private static final int MIN_TIMESTAMP_PRECISION = 1; |
| |
| // Define MAX/MIN precision of DECIMAL type according to Oracle docs: |
| // https://www.techonthenet.com/oracle/datatypes.php |
| private static final int MAX_DECIMAL_PRECISION = 38; |
| private static final int MIN_DECIMAL_PRECISION = 1; |
| |
| @Override |
| public JdbcRowConverter getRowConverter(RowType rowType) { |
| return new OracleRowConverter(rowType); |
| } |
| |
| @Override |
| public String getLimitClause(long limit) { |
| return "FETCH FIRST " + limit + " ROWS ONLY"; |
| } |
| |
| @Override |
| public Optional<String> defaultDriverName() { |
| return Optional.of("oracle.jdbc.OracleDriver"); |
| } |
| |
| @Override |
| public String dialectName() { |
| return "Oracle"; |
| } |
| |
| @Override |
| public String quoteIdentifier(String identifier) { |
| return identifier; |
| } |
| |
| @Override |
| public Optional<String> getUpsertStatement( |
| String tableName, String[] fieldNames, String[] uniqueKeyFields) { |
| |
| String sourceFields = |
| Arrays.stream(fieldNames) |
| .map(f -> ":" + f + " " + quoteIdentifier(f)) |
| .collect(Collectors.joining(", ")); |
| |
| String onClause = |
| Arrays.stream(uniqueKeyFields) |
| .map(f -> "t." + quoteIdentifier(f) + "=s." + quoteIdentifier(f)) |
| .collect(Collectors.joining(" and ")); |
| |
| final Set<String> uniqueKeyFieldsSet = |
| Arrays.stream(uniqueKeyFields).collect(Collectors.toSet()); |
| String updateClause = |
| Arrays.stream(fieldNames) |
| .filter(f -> !uniqueKeyFieldsSet.contains(f)) |
| .map(f -> "t." + quoteIdentifier(f) + "=s." + quoteIdentifier(f)) |
| .collect(Collectors.joining(", ")); |
| |
| String insertFields = |
| Arrays.stream(fieldNames) |
| .map(this::quoteIdentifier) |
| .collect(Collectors.joining(", ")); |
| |
| String valuesClause = |
| Arrays.stream(fieldNames) |
| .map(f -> "s." + quoteIdentifier(f)) |
| .collect(Collectors.joining(", ")); |
| |
| // if we can't divide schema and table-name is risky to call quoteIdentifier(tableName) |
| // for example [tbo].[sometable] is ok but [tbo.sometable] is not |
| String mergeQuery = |
| " MERGE INTO " |
| + tableName |
| + " t " |
| + " USING (SELECT " |
| + sourceFields |
| + " FROM DUAL) s " |
| + " ON (" |
| + onClause |
| + ") " |
| + " WHEN MATCHED THEN UPDATE SET " |
| + updateClause |
| + " WHEN NOT MATCHED THEN INSERT (" |
| + insertFields |
| + ")" |
| + " VALUES (" |
| + valuesClause |
| + ")"; |
| |
| return Optional.of(mergeQuery); |
| } |
| |
| @Override |
| public Optional<Range> decimalPrecisionRange() { |
| return Optional.of(Range.of(MIN_DECIMAL_PRECISION, MAX_DECIMAL_PRECISION)); |
| } |
| |
| @Override |
| public Optional<Range> timestampPrecisionRange() { |
| return Optional.of(Range.of(MIN_TIMESTAMP_PRECISION, MAX_TIMESTAMP_PRECISION)); |
| } |
| |
| @Override |
| public Set<LogicalTypeRoot> supportedTypes() { |
| // The data types used in Oracle are list at: |
| // https://www.techonthenet.com/oracle/datatypes.php |
| |
| return EnumSet.of( |
| LogicalTypeRoot.CHAR, |
| LogicalTypeRoot.VARCHAR, |
| LogicalTypeRoot.BOOLEAN, |
| LogicalTypeRoot.VARBINARY, |
| LogicalTypeRoot.DECIMAL, |
| LogicalTypeRoot.TINYINT, |
| LogicalTypeRoot.SMALLINT, |
| LogicalTypeRoot.INTEGER, |
| LogicalTypeRoot.BIGINT, |
| LogicalTypeRoot.FLOAT, |
| LogicalTypeRoot.DOUBLE, |
| LogicalTypeRoot.DATE, |
| LogicalTypeRoot.TIME_WITHOUT_TIME_ZONE, |
| LogicalTypeRoot.TIMESTAMP_WITHOUT_TIME_ZONE, |
| LogicalTypeRoot.TIMESTAMP_WITH_LOCAL_TIME_ZONE, |
| LogicalTypeRoot.ARRAY); |
| } |
| } |