/*
 * Copyright 2010-2020 Boxfuse GmbH
 *
 * 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 org.flywaydb.core.internal.database.postgresql;

import org.flywaydb.core.api.configuration.Configuration;
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.util.StringUtils;

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

/**
 * PostgreSQL database.
 */
public class PostgreSQLDatabase extends Database<PostgreSQLConnection> {
    /**
     * Creates a new instance.
     *
     * @param configuration The Flyway configuration.
     */
    public PostgreSQLDatabase(Configuration configuration, JdbcConnectionFactory jdbcConnectionFactory



    ) {
        super(configuration, jdbcConnectionFactory



        );
    }

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
















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

        ensureDatabaseNotOlderThanOtherwiseRecommendUpgradeToFlywayEdition("9.4", org.flywaydb.core.internal.license.Edition.ENTERPRISE);

        recommendFlywayUpgradeIfNecessaryForMajorVersion("12");
    }

    @Override
    public String getRawCreateScript(Table table, boolean baseline) {
        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\");\n" +
                "CREATE INDEX \"" + table.getName() + "_s_idx\" ON " + table + " (\"success\");";
    }

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

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

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

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

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

    @Override
    public String doQuote(String identifier) {
        return pgQuote(identifier);
    }

    static String pgQuote(String identifier) {
        return "\"" + StringUtils.replaceAll(identifier, "\"", "\"\"") + "\"";
    }

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

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

}
@@ -4056,9 +4056,905 @@
 %0A    %7D%0A%0A
+    /**%0A     * This exists to fix this issue: https://github.com/flyway/flyway/issues/2638%0A     * See https://www.pgpool.net/docs/latest/en/html/runtime-config-load-balancing.html%0A     */%0A    @Override%0A    public String getSelectStatement(Table table) %7B%0A        return %22/*NO LOAD BALANCE*/%5Cn%22%0A                + %22SELECT %22 + quote(%22installed_rank%22)%0A                + %22,%22 + quote(%22version%22)%0A                + %22,%22 + quote(%22description%22)%0A                + %22,%22 + quote(%22type%22)%0A                + %22,%22 + quote(%22script%22)%0A                + %22,%22 + quote(%22checksum%22)%0A                + %22,%22 + quote(%22installed_on%22)%0A                + %22,%22 + quote(%22installed_by%22)%0A                + %22,%22 + quote(%22execution_time%22)%0A                + %22,%22 + quote(%22success%22)%0A                + %22 FROM %22 + table%0A                + %22 WHERE %22 + quote(%22installed_rank%22) + %22 %3E ?%22%0A                + %22 ORDER BY %22 + quote(%22installed_rank%22);%0A    %7D%0A
 %7D

Fix #2638 Disable load balancing for pgpool-II