56 lines
1.9 KiB
C#
56 lines
1.9 KiB
C#
using Bibblan.Models;
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using Bibblan.ViewModels;
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using Dapper;
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using Microsoft.Extensions.Options;
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using Npgsql;
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namespace Bibblan.Business.Services
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{
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public class BookFilter
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{
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public int? Author;
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public string? Query;
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}
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public class DatabaseService
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{
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BibblanOptions settings;
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public DatabaseService(IOptions<BibblanOptions> options) {
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settings = options.Value;
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}
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public IEnumerable<Books> GetBooks(int count, BookFilter filter = null)
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{
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var conn = new NpgsqlConnection(settings.BibblanConnection);
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var query = "select * from books";
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if(filter != null)
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{
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query += " where ";
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if(filter.Author != null)
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{
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query += $"id in (select book from books_authors_link where author = {filter.Author})";
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} else if(!String.IsNullOrWhiteSpace(query))
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{
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filter.Query = filter.Query.ToLowerInvariant();
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query += $"lower(title) like '%{filter.Query}%' or lower(author_sort) like '%{filter.Query}%'";
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}
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}
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return conn.Query<Books>(query).Take(count).ToList();
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}
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public IEnumerable<AuthorVm> GetAuthors(int count, BookFilter filter = null)
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{
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var query = "select a.id, a.name, count(bal.*) as bookcount\r\nfrom authors a\r\nleft join books_authors_link bal on a.id = bal.author\r\ngroup by a.id , a.name ";
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if(!String.IsNullOrWhiteSpace(filter?.Query))
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{
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filter.Query = filter.Query.ToLowerInvariant();
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query += $" having lower(a.name) like '%{filter.Query}%'";
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}
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var conn = new NpgsqlConnection(settings.BibblanConnection);
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return conn.Query<AuthorVm>(query).Take(count).ToList();
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}
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}
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}
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