PostgreSQLDatabase.java

/*-
 * ========================LICENSE_START=================================
 * flyway-database-postgresql
 * ========================================================================
 * Copyright (C) 2010 - 2026 Red Gate Software Ltd
 * ========================================================================
 * 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.
 * =========================LICENSE_END==================================
 */
package org.flywaydb.database.postgresql;

import static org.flywaydb.core.internal.database.base.DatabaseConstants.DATABASE_HOSTING_AWS_RDS;
import static org.flywaydb.core.internal.database.base.DatabaseConstants.DATABASE_HOSTING_RDS_URL_IDENTIFIER;

import org.flywaydb.core.api.configuration.Configuration;
import org.flywaydb.core.extensibility.Tier;
import org.flywaydb.core.internal.database.base.Database;
import org.flywaydb.core.internal.database.base.Table;
import org.flywaydb.core.internal.jdbc.JdbcConnectionFactory;
import org.flywaydb.core.internal.jdbc.StatementInterceptor;
import org.flywaydb.core.internal.util.StringUtils;

import java.sql.Connection;
import java.sql.SQLException;

public class PostgreSQLDatabase extends Database<PostgreSQLConnection> {
    public PostgreSQLDatabase(final Configuration configuration,
        final JdbcConnectionFactory jdbcConnectionFactory,
        final StatementInterceptor statementInterceptor) {
        super(configuration, jdbcConnectionFactory, statementInterceptor);
    }

    @Override
    protected PostgreSQLConnection doGetConnection(final Connection connection) {
        return new PostgreSQLConnection(this, connection);
    }

    @Override
    public void ensureSupported(final Configuration configuration) {
        ensureDatabaseIsRecentEnough("9.0");

        ensureDatabaseNotOlderThanOtherwiseRecommendUpgradeToFlywayEdition("10", Tier.PREMIUM, configuration);

        recommendFlywayUpgradeIfNecessaryForMajorVersion("18");
    }

    @Override
    public String getRawCreateScript(final Table table, final boolean baseline) {
        final String tablespace = configuration.getTablespace() == null
            ? ""
            : " TABLESPACE \"" + configuration.getTablespace() + "\"";

        return "CREATE TABLE "
            + table
            + " (\n"
            + "    \"installed_rank\" INT NOT NULL,\n"
            + "    \"version\" VARCHAR(50),\n"
            + "    \"description\" VARCHAR(200) NOT NULL,\n"
            + "    \"type\" VARCHAR(20) NOT NULL,\n"
            + "    \"script\" VARCHAR(1000) NOT NULL,\n"
            + "    \"checksum\" INTEGER,\n"
            + "    \"installed_by\" VARCHAR(100) NOT NULL,\n"
            + "    \"installed_on\" TIMESTAMP NOT NULL DEFAULT now(),\n"
            + "    \"execution_time\" INTEGER NOT NULL,\n"
            + "    \"success\" BOOLEAN NOT NULL\n"
            + ")"
            + tablespace
            + ";\n"
            + (baseline ? getBaselineStatement(table) + ";\n" : "")
            + "ALTER TABLE "
            + table
            + " ADD CONSTRAINT \""
            + table.getName()
            + "_pk\" PRIMARY KEY (\"installed_rank\")"
            + (configuration.getTablespace() != null ? " USING INDEX" + tablespace : "")
            + ";\n"
            + "CREATE INDEX \""
            + table.getName()
            + "_s_idx\" ON "
            + table
            + " (\"success\")"
            + tablespace
            + ";";
    }

    @Override
    protected String doGetCurrentUser() throws SQLException {
        return getMainConnection().getJdbcTemplate().queryForString("SELECT current_user");
    }

    @Override
    public boolean supportsDdlTransactions() {
        return true;
    }

    @Override
    public String getBooleanTrue() {
        return "TRUE";
    }

    @Override
    public String getBooleanFalse() {
        return "FALSE";
    }

    @Override
    public String doQuote(final String identifier) {
        return getOpenQuote()
            + StringUtils.replaceAll(identifier, getCloseQuote(), getEscapedQuote())
            + getCloseQuote();
    }

    @Override
    public String getEscapedQuote() {
        return "\"\"";
    }

    @Override
    public boolean catalogIsSchema() {
        return false;
    }

    @Override
    public boolean useSingleConnection() {
        final PostgreSQLConfigurationExtension configurationExtension = configuration.getPluginRegister()
            .getExact(PostgreSQLConfigurationExtension.class);
        return !configurationExtension.isTransactionalLock();
    }

    /**
     * This exists to fix this issue: https://github.com/flyway/flyway/issues/2638 See
     * https://www.pgpool.net/docs/latest/en/html/runtime-config-load-balancing.html
     */
    @Override
    public String getSelectStatement(final Table table) {
        return "/*NO LOAD BALANCE*/\n"
            + "SELECT "
            + quote("installed_rank")
            + ","
            + quote("version")
            + ","
            + quote("description")
            + ","
            + quote("type")
            + ","
            + quote("script")
            + ","
            + quote("checksum")
            + ","
            + quote("installed_on")
            + ","
            + quote("installed_by")
            + ","
            + quote("execution_time")
            + ","
            + quote("success")
            + " FROM "
            + table
            + " WHERE "
            + quote("installed_rank")
            + " > ?"
            + " ORDER BY "
            + quote("installed_rank");
    }

    @Override
    public String getDatabaseHosting() {
        if (getMainConnection().isAwsRds() || DATABASE_HOSTING_RDS_URL_IDENTIFIER.matcher(configuration.getUrl())
            .find()) {
            return DATABASE_HOSTING_AWS_RDS;
        } else {
            return super.getDatabaseHosting();
        }
    }
}