Visualizações: 1.860 views
Fala pessoal!
Nesse post de hoje, vou compartilhar com vocês uma solução que eu desenvolvi para consultar a cotação do dólar (USD), euro (EUR), real (BRL) ou qualquer outra moeda em tempo real (quase) utilizando um WebService (API) e SQLCLR no SQL Server. Isso pode acabar sendo muito útil dependendo da sua área de atuação e é algo que vejo muitas empresas até comprando serviços parecidos com esse.
Se você não sabe o que é SQLCLR, dê uma lida no artigo Introdução ao SQL CLR (Common Language Runtime) no SQL Server antes desse post para entender melhor o que é esse recurso.
O que vamos conseguir fazer ao final desse post:
De onde vêm os dados das cotações?
Para retornar os dados de cotação de moedas, existem vários e vários sites e API’s para consulta. Para esse exemplo, eu optei por utilizar a API do site https://www.currencyconverterapi.com/, que possui plano gratuito para consulta, além de planos pagos, caso você tenha uma necessidade maior de consultas.
A documentação da API pode ser encontrada nesse link aqui.
No plano gratuito, acredito que a maioria das pessoas já serão muito bem atendidas. Inclusive, no próprio site é mencionado que o serviço pode ser utilizado de forma gratuita até para uso comercial.
Limitações do plano gratuito:
- Pares de moedas por solicitação: 2 (Pode consultar até 2 moedas por vez)
- Número de solicitações por hora: 100
- Intevalo de atualização dos dados da cotação: 60 minutos (Ou seja, não adianta tentar atualizar os dados no plano gratuito com frequência menor que 60 minutos)
- Intervalo de datas na busca histórica: 8 dias (A função fncConverteMoedaHistoricoRange só pode retornar um intervalo de dados de até 8 dias)
- Consultas históricas: 1 ano (As datas passadas por parâmetros nas funções fncConverteMoedaHistorico ou fncConverteMoedaHistoricoRange não podem ser mais antigas que 365 dias da data atual)
Caso o plano gratuito não consiga te atender, pode procurar algum plano pago e continuar utilizando essa mesma API e essas funções.
Como conseguir a chave de autenticação da API?
Para adquirir a sua chave da API e começar a utilizar os recursos, acesse esse link aqui, preencha o seu e-mail e você irá receber a sua chave de acesso:
Com essa chave, você já pode utilizar a sua API, respeitando os limites do plano que for utilizar, é claro.
Como utilizar as funções criadas
Antes de demonstrar a utilização, achei legal fazer uma breve descrição sobre cada uma dessas funções.
- fncConverteMoeda: Função que tem como objetivo converter uma moeda para outra, com base na cotação mais atual possível. O retorno dessa função é um número decimal escalar.
- fncConverteMoedaHistorico: Função que tem como objetivo converter uma moeda para outra, com base na cotação da data informada como parâmetro (lembrando das limitações da API). O retorno dessa função é um número decimal escalar.
- fncConverteMoedaHistoricoRange: Função que tem como objetivo converter uma moeda para outra, com base na cotação do range de data informada como parâmetro (lembrando das limitações da API). O retorno dessa função é uma tabela, contendo a data da cotação (Datetime) e o valor da cotação (número decimal escalar), onde cada dia é uma linha da tabela.
Exemplos de uso:
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DECLARE @tokenApi VARCHAR(50) = 'Meu token' -- Retorna a cotação mais atual da moeda desejada SELECT dbo.fncConverteMoeda(@tokenApi, 'USD', 'BRL') -- Retorna a cotação da moeda na data desejada SELECT dbo.fncConverteMoedaHistorico(@tokenApi, 'USD', 'BRL', '2020-07-30') -- Retorna uma tabela com os rates no intervalo desejado SELECT * FROM dbo.fncConverteMoedaHistoricoRange(@tokenApi, 'USD', 'BRL', '2021-01-01', '2021-01-08') |
Resultado:
Como criar os objetos no banco com T-SQL – Modo Easy/Nutella
Se você não tem o Visual Studio ou não quer se preocupar em entender como as funções foram construídas ou compilar a sua própria versão do assembly, esse código é pra você. Simples, rápido e objetivo.
Código T-SQL para criar as funções:
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USE [master] GO DECLARE @VersaoSQL INT = CONVERT(INT, (SERVERPROPERTY('ProductMajorVersion'))) IF (@VersaoSQL >= 15) -- SQL Server 2017+ BEGIN EXEC (' DECLARE @asmBin varbinary(max) = 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DECLARE @hash varbinary(64) = HASHBYTES(''SHA2_512'', @asmBin); IF (EXISTS(SELECT TOP(1) NULL FROM sys.trusted_assemblies WHERE [hash] = @hash)) BEGIN EXEC sys.sp_drop_trusted_assembly @hash = @hash END EXEC sys.sp_add_trusted_assembly @hash = @hash, @description = N''sqlclr_currencyconverter, version=0.0.0.0, culture=neutral, publickeytoken=null, processorarchitecture=msil''' ) END ELSE BEGIN EXEC('ALTER DATABASE [dirceuresende] SET TRUSTWORTHY ON') END USE [dirceuresende] GO IF (EXISTS(SELECT TOP(1) NULL FROM sys.assemblies WHERE [name] = 'SQLCLR_CurrencyConverter')) BEGIN IF (OBJECT_ID('dbo.fncConverteMoeda') IS NOT NULL) DROP FUNCTION dbo.fncConverteMoeda IF (OBJECT_ID('dbo.fncConverteMoedaHistorico') IS NOT NULL) DROP FUNCTION dbo.fncConverteMoedaHistorico IF (OBJECT_ID('dbo.fncConverteMoedaHistoricoRange') IS NOT NULL) DROP FUNCTION dbo.fncConverteMoedaHistoricoRange DROP ASSEMBLY [SQLCLR_CurrencyConverter] END CREATE ASSEMBLY [SQLCLR_CurrencyConverter] FROM 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WITH PERMISSION_SET = EXTERNAL_ACCESS GO CREATE FUNCTION [dbo].[fncConverteMoeda] (@token NVARCHAR (MAX), @moedaOrigem NVARCHAR (MAX), @moedaDestino NVARCHAR (MAX) ) RETURNS FLOAT AS EXTERNAL NAME [SQLCLR_CurrencyConverter].[UserDefinedFunctions].[fncConverteMoeda] GO CREATE FUNCTION [dbo].[fncConverteMoedaHistorico] ( @token NVARCHAR (MAX), @moedaOrigem NVARCHAR (MAX), @moedaDestino NVARCHAR (MAX), @data DATETIME ) RETURNS FLOAT AS EXTERNAL NAME [SQLCLR_CurrencyConverter].[UserDefinedFunctions].[fncConverteMoedaHistorico] GO CREATE FUNCTION [dbo].[fncConverteMoedaHistoricoRange] ( @token NVARCHAR (MAX), @moedaOrigem NVARCHAR (MAX), @moedaDestino NVARCHAR (MAX), @dataInicio DATETIME, @dataFim DATETIME ) RETURNS TABLE ( [Dt_Cotacao] DATETIME NULL, [Vl_Cotacao] FLOAT NULL ) AS EXTERNAL NAME [SQLCLR_CurrencyConverter].[UserDefinedFunctions].[fncConverteMoedaHistoricoRange] GO |
Muito cuidado ao utilizar o parâmetro TRUSTWORTHY no database, pois em determinada situação, pode ser um grave risco de segurança ao seu ambiente, conforme demonstrei no artigo SQL Server – Entendendo os riscos da propriedade TRUSTWORTHY habilitada em um database. Procure utilizar o recurso de trusted assembly do SQL Server 2017+ ou chave assimétrica, caso possível.
Como compilar o seu projeto SQLCLR no Visual Studio – Modo Hard/Raiz
Se você tem o Visual Studio e quer entender como as funções foram construídas ou compilar a sua própria versão do assembly, esse código é pra você.
Caso você não saiba o que é SQLCLR ou como compilar e publicar o projeto, dê uma lida no artigo Introdução ao SQL CLR (Common Language Runtime) no SQL Server antes desse post para entender melhor o que é esse recurso.
Download da solução do Visual Studio (VS2019)
Download do Projeto SQLCLR_CurrencyConverter
Código-fonte do fncConverteMoeda.cs
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using System.Data.SqlTypes; using System.IO; using System.Net; using System.Text; public partial class UserDefinedFunctions { [Microsoft.SqlServer.Server.SqlFunction] public static SqlDouble fncConverteMoeda (string token, string moedaOrigem, string moedaDestino) { var url = "https://free.currconv.com/api/v7/convert?q=" + moedaOrigem + "_" + moedaDestino + "&compact=ultra&apiKey=" + token; var request = (HttpWebRequest)WebRequest.Create(url); request.Method = "GET"; request.ContentType = "application/json"; var resposta = ""; using (var response = (HttpWebResponse)request.GetResponse()) { using (var stream = response.GetResponseStream()) { if (stream != null) { using (var streamReader = new StreamReader(stream, Encoding.GetEncoding("UTF-8"))) { resposta = streamReader.ReadToEnd(); } } } } return SqlDouble.Parse(resposta.Substring(resposta.IndexOf(":") + 1).Replace("}", "")) ; } } |
Código-fonte do fncConverteMoedaHistorico.cs
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using System.Data.SqlTypes; using System.IO; using System.Net; using System.Text; public partial class UserDefinedFunctions { [Microsoft.SqlServer.Server.SqlFunction] public static SqlDouble fncConverteMoedaHistorico(string token, string moedaOrigem, string moedaDestino, SqlDateTime data) { var url = "https://free.currconv.com/api/v7/convert?q=" + moedaOrigem + "_" + moedaDestino + "&compact=ultra&date=" + data.Value.ToString("yyyy-MM-dd") + "&apiKey=" + token; var request = (HttpWebRequest)WebRequest.Create(url); request.Method = "GET"; request.ContentType = "application/json"; var resposta = ""; using (var response = (HttpWebResponse)request.GetResponse()) { using (var stream = response.GetResponseStream()) { if (stream != null) { using (var streamReader = new StreamReader(stream, Encoding.GetEncoding("UTF-8"))) { resposta = streamReader.ReadToEnd(); } } } } return SqlDouble.Parse(resposta.Substring(resposta.LastIndexOf(":") + 1).Replace("}}", "")); } } |
Código-fonte do fncConverteMoedaHistoricoRange.cs
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using System; using System.Collections; using System.Data.SqlTypes; using System.IO; using System.Net; using System.Text; public partial class UserDefinedFunctions { private class ConsultaCotacao { public SqlDateTime Data; public SqlDouble Cotacao; public ConsultaCotacao(SqlDateTime data, SqlDouble cotacao) { Data = data; Cotacao = cotacao; } } [Microsoft.SqlServer.Server.SqlFunction( FillRowMethodName = "FillRow_ConsultaCotacao", TableDefinition = "Dt_Cotacao DATETIME, Vl_Cotacao FLOAT" )] public static IEnumerable fncConverteMoedaHistoricoRange(string token, string moedaOrigem, string moedaDestino, SqlDateTime dataInicio, SqlDateTime dataFim) { var consultaCotacaoCollection = new ArrayList(); var url = "https://free.currconv.com/api/v7/convert?q=" + moedaOrigem + "_" + moedaDestino + "&compact=ultra&date=" + dataInicio.Value.ToString("yyyy-MM-dd") + "&endDate=" + dataFim.Value.ToString("yyyy-MM-dd") + "&apiKey=" + token; var request = (HttpWebRequest)WebRequest.Create(url); request.Method = "GET"; request.ContentType = "application/json"; var resposta = ""; using (var response = (HttpWebResponse)request.GetResponse()) { using (var stream = response.GetResponseStream()) { if (stream != null) { using (var streamReader = new StreamReader(stream, Encoding.GetEncoding("UTF-8"))) { resposta = streamReader.ReadToEnd(); if (resposta.IndexOf("error", StringComparison.InvariantCultureIgnoreCase) >= 0) { consultaCotacaoCollection.Add(new ConsultaCotacao( SqlDateTime.Null, -1 )); return consultaCotacaoCollection; } resposta = resposta.Replace("{", "").Replace("}", "").Replace("\"", ""); resposta = resposta.Substring(resposta.IndexOf(":") + 1); var varLinhas = resposta.Split(','); var numLinhas = varLinhas.Length; for(var i = 0; i < numLinhas; i++) { var linha = varLinhas[i]; var palavras = linha.Split(':'); consultaCotacaoCollection.Add(new ConsultaCotacao( Convert.ToDateTime(palavras[0]), Convert.ToDouble(palavras[1]) )); } } } } } return consultaCotacaoCollection; } protected static void FillRow_ConsultaCotacao(object objConsultaCotacao, out SqlDateTime data, out SqlDouble cotacao) { var consultaCotacao = (ConsultaCotacao) objConsultaCotacao; data = consultaCotacao.Data; cotacao = consultaCotacao.Cotacao; } } |
E é isso aí, pessoal!
Espero que tenham gostado dessa dica e até a próxima!
Portuguese 
English
Massa, !