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- cmd = new MySqlCommand("SELECT * FROM prueba.facturas where Certificado = @certificado", conn);
- cmd.Parameters.AddWithValue("@certificado", xCertificado);
- cmd.ExecuteNonQuery();
- if (consulta es = 0){
- }
- cmd = new MySqlCommand("SELECT count(*) FROM prueba.facturas where Certificado = @certificado", conn);
- cmd.Parameters.AddWithValue("@certificado", xCertificado);
- if(cmd.ExecuteScalar() > 0 ) { existe }
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