/*
 * Copyright (c) 2011-2025, baomidou (jobob@qq.com).
 *
 * 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.baomidou.mybatisplus.generator.config.querys;

import com.baomidou.mybatisplus.generator.config.DataSourceConfig;

import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * H2Database 表数据查询 (只适用H2 1.X版本)
 *
 * @author yuxiaobin
 * @since 2019-01-8
 */
public class H2Query extends AbstractDbQuery {

    public static final String PK_QUERY_SQL = "select * from INFORMATION_SCHEMA.INDEXES WHERE TABLE_NAME = '%s'";

    @Override
    public String tablesSql() {
        return "SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE 1=1 ";
    }

    @Override
    public String tableFieldsSql() {
        return "SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME= '%s' ";
    }

    @Override
    public String tableName() {
        return "TABLE_NAME";
    }

    @Override
    public String tableComment() {
        return "REMARKS";
    }

    @Override
    public String fieldName() {
        return "COLUMN_NAME";
    }

    @Override
    public String fieldType() {
        return "TYPE_NAME";
    }

    @Override
    public String fieldComment() {
        return "REMARKS";
    }

    @Override
    public String fieldKey() {
        return "PRIMARY_KEY";
    }

    @Override
    public boolean isKeyIdentity(ResultSet results) throws SQLException {
        return results.getString("SEQUENCE_NAME") != null;
    }

    @Override
    public String primaryKeySql(DataSourceConfig dataSourceConfig, String tableName) {
        return String.format(PK_QUERY_SQL, tableName);
    }

}
