public async Task <T> Retrieve <T>(T item) where T : class
{
string whereStr = $"WHERE {ObjectEvaluator.ToWhereString<T>(item)}";
var result = await QueryBuilder.Select <T>().Where(whereStr).ExecuteQueryAsync();
return(result.FirstOrDefault());
}
public Task Remove <T>(T item) where T : class
{
string queryStr = $"DELETE FROM {StringToolkit.PascalToUnderscore(typeof(T).Name)} " +
$"WHERE {ObjectEvaluator.ToWhereString<T>(item)}";
return(QueryBuilder.ExecuteQueryAsync <T>(queryStr));
}
public void RemoveRange <T>(IEnumerable <T> items) where T : class
{
string queryStr = $"DELETE FROM {StringToolkit.PascalToUnderscore(typeof(T).Name)} " +
$"WHERE {ObjectEvaluator.ToWhereString<T>(items)}";
QueryBuilder.ExecuteQuery <T>(queryStr);
}
public async Task <bool> Contains <T>(T item) where T : class
{
string whereStr = $"WHERE {ObjectEvaluator.ToWhereString<T>(item)}";
string queryStr = $"SELECT * " +
$"FROM {StringToolkit.PascalToUnderscore(typeof(T).Name)} " +
$"{whereStr}";
return((await QueryBuilder.ExecuteQueryAsync <T>(queryStr)).Any());
}
public Task <IEnumerable <T> > RetrieveRange <T>(IEnumerable <T> items) where T : class
{
string whereConditions = items.Select(item => $"({ObjectEvaluator.ToWhereString<T>(item)}) OR")
.Aggregate((i1, i2) => $"{i1} {i2}").Trim();
Regex rg = new Regex(" OR$");
string whereStr = $"WHERE {rg.Replace(whereConditions, "")}";
return(QueryBuilder.Select <T>().Where(whereStr).ExecuteQueryAsync());
}
public Task Set <T>(T oldValue, T newValue) where T : class
{
string setStr = $"SET {ObjectEvaluator.ToWhereString<T>(newValue).Replace(" AND ", ", \n")}";
string whereStr = $"WHERE {ObjectEvaluator.ToWhereString<T>(oldValue)}";
string queryStr = $"UPDATE {StringToolkit.PascalToUnderscore(typeof(T).Name)} " +
$"{setStr} {whereStr}";
return(QueryBuilder.ExecuteNonQueryAsync(queryStr));
}
public IFilterableQueryBuilder <TEntity> Set(dynamic newValues)
{
ParameterMap = ObjectEvaluator.ToDictionary(newValues);
Console.WriteLine(string.Join("\n", ParameterMap));
StringBuilder setStringBuilder = new StringBuilder();
setStringBuilder.Append(ObjectEvaluator.EvaluateToParameterizedSqlString(ParameterMap));
string setStr = setStringBuilder.ToString();
var cmd = Connection.CreateCommand();
ParameterCollection = cmd.CreateParameters((object)newValues);
QueryStringBuilder.Append($" SET {setStr}");
return(this);
}
