PostgresqlInsertUpdateDuplicate.java

/*
 * Copyright 2016 Hortonworks.
 *
 * 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.hortonworks.registries.storage.impl.jdbc.provider.postgresql.query;

import com.hortonworks.registries.common.Schema;
import com.hortonworks.registries.storage.Storable;
import com.hortonworks.registries.storage.impl.jdbc.provider.sql.query.AbstractStorableSqlQuery;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;

/**
 *
 */
public class PostgresqlInsertUpdateDuplicate extends AbstractStorableSqlQuery {

    public PostgresqlInsertUpdateDuplicate(Storable storable) {
        super(storable);
    }

    @Override
    protected Collection<String> getColumnNames(Collection<Schema.Field> columns, final String formatter) {
        Collection<String> collection = new ArrayList<>();
        for (Schema.Field field: columns) {
            if (!field.getName().equalsIgnoreCase("id") || getStorableId() != null) {
                String fieldName = formatter == null ? field.getName() : String.format(formatter, field.getName());
                collection.add(fieldName);
            }
        }
        return collection;
    }

    // "INSERT INTO DB.TABLE (name, age) VALUES("A", 19) ON DUPLICATE KEY UPDATE name="A", age=19";
    @Override
    protected void initParameterizedSql() {
        Collection<String> columnNames = getColumnNames(columns, "\"%s\"");
        sql = "INSERT INTO " + tableName + " ("
                + join(columnNames, ", ")
                + ") VALUES(" + getBindVariables("?,", columnNames.size()) + ")"
                + " ON CONFLICT ON CONSTRAINT " + tableName + "_pkey"
                + " DO UPDATE SET " + join(getColumnNames(columns, "\"%s\" = ?"), ", ");
        log.debug(sql);
    }

    @Override
    public List<Schema.Field> getColumns() {
        List<Schema.Field> cols = super.getColumns();
        if (getStorableId() == null) {
            return cols.stream()
                    .filter(f -> !f.getName().equalsIgnoreCase("id"))
                    .collect(Collectors.toList());
        }
        return cols;
    }

    private Long getStorableId() {
        try {
            return getStorable().getId();
        } catch (UnsupportedOperationException ex) {
            // ignore
        }
        return null;
    }
}