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/*
 * 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.dialect;
import net.hasor.db.jdbc.lambda.segment.SqlLike;
import net.hasor.utils.StringUtils;

import java.sql.JDBCType;

/**
 * SQL 方言
 * @version : 2020-10-31
 * @author 赵永春 ([email protected])
 */
public interface SqlDialect {
    public static final SqlDialect DEFAULT = new DefaultSqlDialect();

    /** 生成 select 时的列信息 */
    public String buildSelect(String category, String tableName, String columnName, JDBCType jdbcType, Class javaType);

    /** 生成 form 后面的表名 */
    public String buildTableName(String category, String tableName);

    /** 生成 where 中用到的条件名(包括 group by、order by) */
    public String buildColumnName(String category, String tableName, String columnName, JDBCType jdbcType, Class javaType);

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

    /** 生成 count 查询 SQL */
    public default BoundSql getCountSql(BoundSql boundSql) {
        return new BoundSql.BoundSqlObj("SELECT COUNT(*) FROM (" + boundSql.getSqlString() + ") as TEMP_T", boundSql.getArgs());
    }

    /** 生成分页查询 SQL */
    public BoundSql getPageSql(BoundSql boundSql, int start, int limit);
}




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