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JDBC Type 4 driver for MySQL.
There is a newer version: 9.1.0
/*
 * Copyright (c) 2018, 2024, Oracle and/or its affiliates.
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License, version 2.0, as published by
 * the Free Software Foundation.
 *
 * This program is designed to work with certain software that is licensed under separate terms, as designated in a particular file or component or in
 * included license documentation. The authors of MySQL hereby grant you an additional permission to link the program and your derivative works with the
 * separately licensed software that they have either included with the program or referenced in the documentation.
 *
 * Without limiting anything contained in the foregoing, this file, which is part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
 * version 1.0, a copy of which can be found at http://oss.oracle.com/licenses/universal-foss-exception.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0, for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

package com.mysql.cj;

import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;

import com.mysql.cj.result.LongValueFactory;
import com.mysql.cj.xdevapi.ExprUnparser;

public class DataStoreMetadataImpl implements DataStoreMetadata {

    private Session session;

    public DataStoreMetadataImpl(Session sess) {
        this.session = sess;
    }

    @Override
    public boolean schemaExists(String schemaName) {
        StringBuilder stmt = new StringBuilder("select count(*) from information_schema.schemata where schema_name = '");
        // TODO: verify quoting rules
        stmt.append(schemaName.replaceAll("'", "\\'"));
        stmt.append("'");

        Function rowToLong = r -> r.getValue(0, new LongValueFactory(this.session.getPropertySet()));
        List counters = this.session.query(this.session.getMessageBuilder().buildSqlStatement(stmt.toString()), null, rowToLong, Collectors.toList());
        return 1 == counters.get(0);
    }

    @Override
    public boolean tableExists(String schemaName, String tableName) {
        StringBuilder stmt = new StringBuilder("select count(*) from information_schema.tables where table_schema = '");
        // TODO: verify quoting rules
        stmt.append(schemaName.replaceAll("'", "\\'"));
        stmt.append("' and table_name = '");
        stmt.append(tableName.replaceAll("'", "\\'"));
        stmt.append("'");

        Function rowToLong = r -> r.getValue(0, new LongValueFactory(this.session.getPropertySet()));
        List counters = this.session.query(this.session.getMessageBuilder().buildSqlStatement(stmt.toString()), null, rowToLong, Collectors.toList());
        return 1 == counters.get(0);
    }

    @Override
    public long getTableRowCount(String schemaName, String tableName) {
        StringBuilder stmt = new StringBuilder("select count(*) from ");
        stmt.append(ExprUnparser.quoteIdentifier(schemaName));
        stmt.append(".");
        stmt.append(ExprUnparser.quoteIdentifier(tableName));

        Function rowToLong = r -> r.getValue(0, new LongValueFactory(this.session.getPropertySet()));
        List counters = this.session.query(this.session.getMessageBuilder().buildSqlStatement(stmt.toString()), null, rowToLong, Collectors.toList());
        return counters.get(0);
    }

}