DataMate/backend/services/data-management-service/src/main/resources/mappers/DatasetMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.datamate.datamanagement.infrastructure.persistence.mapper.DatasetMapper">

  <sql id="Base_Column_List">
    id, parent_dataset_id, name, description, dataset_type, category, path, format, schema_info, size_bytes, file_count, record_count,
        retention_days, tags, metadata, status, is_public, is_featured, version, created_at, updated_at, created_by, updated_by
  </sql>

  <sql id="Alias_D_Column_List">
        d.id AS id,
        d.parent_dataset_id AS parent_dataset_id,
        d.name AS name,
        d.description AS description,
        d.dataset_type AS dataset_type,
        d.category AS category,
        d.path AS path,
        d.format AS format,
        d.schema_info AS schema_info,
        d.size_bytes AS size_bytes,
        d.file_count AS file_count,
        d.record_count AS record_count,
        d.retention_days AS retention_days,
        d.tags AS tags,
        d.metadata AS metadata,
        d.status AS status,
        d.is_public AS is_public,
        d.is_featured AS is_featured,
        d.version AS version,
        d.created_at AS created_at,
        d.updated_at AS updated_at,
        d.created_by AS created_by,
        d.updated_by AS updated_by
  </sql>

  <select id="findById" parameterType="string" resultType="com.datamate.datamanagement.domain.model.dataset.Dataset">
        SELECT <include refid="Base_Column_List"/>
        FROM t_dm_datasets
        WHERE id = #{id}
    </select>

  <select id="findByName" parameterType="string"
          resultType="com.datamate.datamanagement.domain.model.dataset.Dataset">
        SELECT <include refid="Base_Column_List"/>
        FROM t_dm_datasets
        WHERE name = #{name}
        LIMIT 1
    </select>

  <select id="findByStatus" parameterType="string"
          resultType="com.datamate.datamanagement.domain.model.dataset.Dataset">
        SELECT <include refid="Base_Column_List"/>
        FROM t_dm_datasets
        WHERE status = #{status}
        ORDER BY updated_at DESC
    </select>

  <select id="findByCreatedBy" resultType="com.datamate.datamanagement.domain.model.dataset.Dataset">
        SELECT <include refid="Base_Column_List"/>
        FROM t_dm_datasets
        WHERE created_by = #{createdBy}
        ORDER BY created_at DESC
    </select>

  <select id="findByTypeCode" resultType="com.datamate.datamanagement.domain.model.dataset.Dataset">
        SELECT <include refid="Base_Column_List"/>
        FROM t_dm_datasets
        WHERE dataset_type = #{typeCode}
        ORDER BY created_at DESC
    </select>

  <select id="findByTagNames" resultType="com.datamate.datamanagement.domain.model.dataset.Dataset">
        SELECT DISTINCT <include refid="Alias_D_Column_List"/>
        FROM t_dm_datasets d
        JOIN t_dm_dataset_tags dt ON d.id = dt.dataset_id
        JOIN t_dm_tags t ON t.id = dt.tag_id
        WHERE t.name IN
        <foreach collection="tagNames" item="name" open="(" separator="," close=")">
            #{name}
        </foreach>
        ORDER BY d.created_at DESC
    </select>

  <select id="findByKeyword" resultType="com.datamate.datamanagement.domain.model.dataset.Dataset">
        SELECT <include refid="Base_Column_List"/>
        FROM t_dm_datasets
        WHERE name LIKE CONCAT('%', #{keyword}, '%')
           OR description LIKE CONCAT('%', #{keyword}, '%')
        ORDER BY created_at DESC
    </select>

  <select id="findByCriteria" resultType="com.datamate.datamanagement.domain.model.dataset.Dataset">
        SELECT DISTINCT <include refid="Alias_D_Column_List"/>
        FROM t_dm_datasets d
        LEFT JOIN t_dm_dataset_tags dt ON d.id = dt.dataset_id
        LEFT JOIN t_dm_tags t ON t.id = dt.tag_id
        <where>
            <if test="typeCode != null and typeCode != ''">
                AND d.dataset_type = #{typeCode}
            </if>
            <if test="status != null and status != ''">
                AND d.status = #{status}
            </if>
            <if test="keyword != null and keyword != ''">
                AND (d.name LIKE CONCAT('%', #{keyword}, '%') OR d.description LIKE CONCAT('%', #{keyword}, '%'))
            </if>
            <if test="tagNames != null and tagNames.size > 0">
                AND t.name IN
                <foreach collection="tagNames" item="n" open="(" separator="," close=")">
                    #{n}
                </foreach>
            </if>
        </where>
        ORDER BY d.created_at DESC
    </select>

    <select id="countByCriteria" resultType="long">
        SELECT COUNT(DISTINCT d.id)
        FROM t_dm_datasets d
        LEFT JOIN t_dm_dataset_tags dt ON d.id = dt.dataset_id
        LEFT JOIN t_dm_tags t ON t.id = dt.tag_id
        <where>
            <if test="typeCode != null and typeCode != ''">
                AND d.dataset_type = #{typeCode}
            </if>
            <if test="status != null and status != ''">
                AND d.status = #{status}
            </if>
            <if test="keyword != null and keyword != ''">
                AND (d.name LIKE CONCAT('%', #{keyword}, '%') OR d.description LIKE CONCAT('%', #{keyword}, '%'))
            </if>
            <if test="tagNames != null and tagNames.size > 0">
                AND t.name IN
                <foreach collection="tagNames" item="n" open="(" separator="," close=")">
                    #{n}
                </foreach>
            </if>
        </where>
    </select>

    <delete id="deleteById" parameterType="string">
        DELETE FROM t_dm_datasets WHERE id = #{id}
    </delete>

    <select id="getAllDatasetStatistics" resultType="com.datamate.datamanagement.interfaces.dto.AllDatasetStatisticsResponse">
      SELECT
        (SELECT COUNT(*) FROM t_dm_datasets) AS total_datasets,
        (SELECT COALESCE(SUM(size_bytes), 0) FROM t_dm_datasets) AS total_size,
        (SELECT COUNT(*)
         FROM t_dm_dataset_files
         WHERE metadata IS NULL OR JSON_EXTRACT(metadata, '$.derived_from_file_id') IS NULL) AS total_files
    </select>
</mapper>