dev.miku.r2dbc.mysql.MySqlStatementSupport Maven / Gradle / Ivy

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/*
 * Copyright 2018-2020 the original author or authors.
 *
 * 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 dev.miku.r2dbc.mysql;

import reactor.util.annotation.Nullable;

import static dev.miku.r2dbc.mysql.util.AssertUtils.require;
import static dev.miku.r2dbc.mysql.util.AssertUtils.requireNonNull;
import static dev.miku.r2dbc.mysql.util.AssertUtils.requireValidName;

/**
 * Base class considers generic logic for {@link MySqlStatement} implementations.
 */
abstract class MySqlStatementSupport implements MySqlStatement {

    private static final String LAST_INSERT_ID = "LAST_INSERT_ID";

    @Nullable
    String generatedKeyName = null;

    @Override
    public final MySqlStatement returnGeneratedValues(String... columns) {
        requireNonNull(columns, "columns must not be null");

        switch (columns.length) {
            case 0:
                this.generatedKeyName = LAST_INSERT_ID;
                break;
            case 1:
                this.generatedKeyName = requireValidName(columns[0], "id name must not be empty and not contain backticks");
                break;
            default:
                throw new IllegalArgumentException("MySQL only supports single generated value");
        }

        return this;
    }

    @Override
    public MySqlStatement fetchSize(int rows) {
        require(rows >= 0, "Fetch size must be greater or equal to zero");
        return this;
    }
}