/*
 * Copyright 2002-2010 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 net.hasor.db.jdbc.lambda.dialect;
import net.hasor.db.jdbc.lambda.segment.SqlLike;
import net.hasor.db.jdbc.mapping.FieldInfo;
import net.hasor.db.jdbc.mapping.TableInfo;
import net.hasor.utils.StringUtils;

/**
 * SQL 方言
 * @version : 2020-10-31
 * @author 赵永春 (zyc@hasor.net)
 */
public interface SqlDialect {
    public static final SqlDialect DEFAULT = new DefaultSqlDialect();

    /** 生成 select 时的列信息 */
    public String buildSelect(TableInfo tableInfo, FieldInfo fieldInfo);

    /** 生成 form 后面的表名 */
    public String buildTableName(TableInfo tableInfo);

    /** 生成 where 中用到的条件名（包括 group by、order by） */
    public String buildConditionName(TableInfo tableInfo, FieldInfo fieldInfo);

    public default String buildLike(SqlLike likeType, String paramName, Object value) {
        if (value == null || StringUtils.isBlank(value.toString())) {
            return "%";
        }
        switch (likeType) {
        case LEFT:
            return "CONCAT('%', " + paramName + " )";
        case RIGHT:
            return "CONCAT( " + paramName + " ,'%')";
        default:
            return "CONCAT('%', " + paramName + " ,'%')";
        }
    }
}