63 lines
2.1 KiB
Java
63 lines
2.1 KiB
Java
package com.cloudhandson.vpdbackoffice.service;
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import com.cloudhandson.vpdbackoffice.domain.structured.StructuredDataPreview;
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import com.cloudhandson.vpdbackoffice.domain.structured.StructuredDataTable;
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import java.util.List;
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import java.util.Map;
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import org.springframework.dao.DataAccessException;
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import org.springframework.jdbc.core.JdbcTemplate;
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import org.springframework.stereotype.Service;
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@Service
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public class StructuredDataService {
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private static final int ROW_LIMIT = 50;
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private final JdbcTemplate jdbcTemplate;
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private final DataCatalog catalog;
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public StructuredDataService(JdbcTemplate jdbcTemplate, DataCatalog catalog) {
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this.jdbcTemplate = jdbcTemplate;
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this.catalog = catalog;
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}
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public List<StructuredDataTable> tables() {
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return catalog.objects();
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}
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public String defaultKey() {
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return catalog.objects().getFirst().key();
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}
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public StructuredDataTable requireTable(String key) {
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return catalog.require(key);
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}
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public StructuredDataPreview preview(String key) {
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StructuredDataTable table = requireTable(key);
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try {
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List<String> columns = jdbcTemplate.query(
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"""
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SELECT column_name
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FROM all_tab_columns
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WHERE owner = ?
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AND table_name = ?
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ORDER BY column_id
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""",
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(resultSet, rowNum) -> resultSet.getString(1), catalog.owner(), table.tableName());
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if (columns.isEmpty()) {
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throw new AppException("정형 데이터 테이블의 컬럼 정보를 찾을 수 없습니다.");
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}
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List<Map<String, Object>> rows = jdbcTemplate.queryForList(
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previewSql(table), ROW_LIMIT);
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return new StructuredDataPreview(table, columns, rows, ROW_LIMIT);
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} catch (DataAccessException exception) {
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throw new AppException("카탈로그 데이터를 조회할 수 없습니다. DB 권한과 대상 객체 상태를 확인하세요.");
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}
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}
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private String previewSql(StructuredDataTable table) {
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return "SELECT * FROM \"" + catalog.owner() + "\".\"" + table.tableName() + "\" WHERE ROWNUM <= ?";
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}
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}
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