| /* |
| * 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.postgres.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 PostgresSQL. */ |
| @Internal |
| public class PostgresDialect extends AbstractDialect { |
| |
| private static final long serialVersionUID = 1L; |
| |
| // Define MAX/MIN precision of TIMESTAMP type according to PostgreSQL docs: |
| // https://www.postgresql.org/docs/12/datatype-datetime.html |
| private static final int MAX_TIMESTAMP_PRECISION = 6; |
| private static final int MIN_TIMESTAMP_PRECISION = 1; |
| |
| // Define MAX/MIN precision of DECIMAL type according to PostgreSQL docs: |
| // https://www.postgresql.org/docs/12/datatype-numeric.html#DATATYPE-NUMERIC-DECIMAL |
| private static final int MAX_DECIMAL_PRECISION = 1000; |
| private static final int MIN_DECIMAL_PRECISION = 1; |
| |
| @Override |
| public JdbcRowConverter getRowConverter(RowType rowType) { |
| return new PostgresRowConverter(rowType); |
| } |
| |
| @Override |
| public String getLimitClause(long limit) { |
| return "LIMIT " + limit; |
| } |
| |
| @Override |
| public Optional<String> defaultDriverName() { |
| return Optional.of("org.postgresql.Driver"); |
| } |
| |
| /** Postgres upsert query. It use ON CONFLICT ... DO UPDATE SET.. to replace into Postgres. */ |
| @Override |
| public Optional<String> getUpsertStatement( |
| String tableName, String[] fieldNames, String[] uniqueKeyFields) { |
| String uniqueColumns = |
| Arrays.stream(uniqueKeyFields) |
| .map(this::quoteIdentifier) |
| .collect(Collectors.joining(", ")); |
| String updateClause = |
| Arrays.stream(fieldNames) |
| .map(f -> quoteIdentifier(f) + "=EXCLUDED." + quoteIdentifier(f)) |
| .collect(Collectors.joining(", ")); |
| return Optional.of( |
| getInsertIntoStatement(tableName, fieldNames) |
| + " ON CONFLICT (" |
| + uniqueColumns |
| + ")" |
| + " DO UPDATE SET " |
| + updateClause); |
| } |
| |
| @Override |
| public String quoteIdentifier(String identifier) { |
| return identifier; |
| } |
| |
| @Override |
| public String dialectName() { |
| return "PostgreSQL"; |
| } |
| |
| @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 PostgreSQL are list at: |
| // https://www.postgresql.org/docs/12/datatype.html |
| |
| // TODO: We can't convert BINARY data type to |
| // PrimitiveArrayTypeInfo.BYTE_PRIMITIVE_ARRAY_TYPE_INFO in |
| // LegacyTypeInfoDataTypeConverter. |
| |
| 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); |
| } |
| } |