118 lines
3.9 KiB
C#
118 lines
3.9 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Data.SqlClient;
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using System.Threading.Tasks;
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using Newtonsoft.Json;
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namespace Tapeti.Flow.SQL
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{
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/*
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Assumes the following table layout (table name configurable and may include schema):
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create table Flow
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(
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FlowID uniqueidentifier not null,
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CreationTime datetime2(3) not null,
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StateJson nvarchar(max) null,
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constraint PK_Flow primary key clustered (FlowID)
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);
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*/
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public class SqlConnectionFlowRepository : IFlowRepository
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{
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private readonly string connectionString;
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private readonly string tableName;
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public SqlConnectionFlowRepository(string connectionString, string tableName = "Flow")
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{
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this.connectionString = connectionString;
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this.tableName = tableName;
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}
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public async Task<List<KeyValuePair<Guid, T>>> GetStates<T>()
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{
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using (var connection = await GetConnection())
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{
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var flowQuery = new SqlCommand($"select FlowID, StateJson from {tableName}", connection);
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var flowReader = await flowQuery.ExecuteReaderAsync();
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var result = new List<KeyValuePair<Guid, T>>();
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while (await flowReader.ReadAsync())
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{
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var flowID = flowReader.GetGuid(0);
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var stateJson = flowReader.GetString(1);
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var state = JsonConvert.DeserializeObject<T>(stateJson);
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result.Add(new KeyValuePair<Guid, T>(flowID, state));
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}
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return result;
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}
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}
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public async Task CreateState<T>(Guid flowID, T state, DateTime timestamp)
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{
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using (var connection = await GetConnection())
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{
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var query = new SqlCommand($"insert into {tableName} (FlowID, StateJson, CreationTime)" +
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"values (@FlowID, @StateJson, @CreationTime)",
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connection);
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var flowIDParam = query.Parameters.Add("@FlowID", SqlDbType.UniqueIdentifier);
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var stateJsonParam = query.Parameters.Add("@StateJson", SqlDbType.NVarChar);
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var creationTimeParam = query.Parameters.Add("@CreationTime", SqlDbType.DateTime2);
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flowIDParam.Value = flowID;
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stateJsonParam.Value = JsonConvert.SerializeObject(state);
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creationTimeParam.Value = timestamp;
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await query.ExecuteNonQueryAsync();
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}
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}
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public async Task UpdateState<T>(Guid flowID, T state)
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{
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using (var connection = await GetConnection())
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{
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var query = new SqlCommand($"update {tableName} set StateJson = @StateJson where FlowID = @FlowID", connection);
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var flowIDParam = query.Parameters.Add("@FlowID", SqlDbType.UniqueIdentifier);
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var stateJsonParam = query.Parameters.Add("@StateJson", SqlDbType.NVarChar);
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flowIDParam.Value = flowID;
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stateJsonParam.Value = JsonConvert.SerializeObject(state);
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await query.ExecuteNonQueryAsync();
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}
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}
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public async Task DeleteState(Guid flowID)
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{
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using (var connection = await GetConnection())
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{
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var query = new SqlCommand($"delete from {tableName} where FlowID = @FlowID", connection);
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var flowIDParam = query.Parameters.Add("@FlowID", SqlDbType.UniqueIdentifier);
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flowIDParam.Value = flowID;
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await query.ExecuteNonQueryAsync();
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}
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}
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private async Task<SqlConnection> GetConnection()
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{
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var connection = new SqlConnection(connectionString);
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await connection.OpenAsync();
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return connection;
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}
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}
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}
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