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SqlResult.cs
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using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Data;
using System.Dynamic;
using System.Threading.Tasks;
namespace DirectSQL
{
/// <summary>
/// Object to get result of SQL
/// </summary>
/// <remarks>This stands for cursor in RDB</remarks>
/// <typeparam name="R">Type of DataReader</typeparam>
/// <typeparam name="CMD">Type of DbCommand</typeparam>
/// <typeparam name="T">Type of Transaction</typeparam>
/// <typeparam name="C">Type of Connection</typeparam>
/// <typeparam name="P">Type of DataParameter</typeparam>
public class SqlResult<R,CMD,T,C,P>:EnumerableObject<dynamic>,IDisposable
where R : IDataReader
where CMD : IDbCommand
where T : IDbTransaction
where C : IDbConnection
where P : IDataParameter, new()
{
private R _reader;
private CMD _command;
private ImmutableArray<String> _resultFields = emptyFields;
private static readonly ImmutableArray<string> emptyFields = new ImmutableArray<string>();
private ExpandoObject _resultValues;
private (String name, Object value)[] _resultTuples;
private readonly IEnumerable<dynamic> _innerEnumerator;
/// <summary>
/// variable not to execute not needed initialization
/// </summary>
private bool _allowInitialize;
/// <summary>
/// Reader in ADO.NET
/// </summary>
public IDataReader Reader
{
get
{
return _reader;
}
}
/// <summary>
/// Command in ADO.NET
/// </summary>
public IDbCommand Command
{
get
{
return _command;
}
}
/// <summary>
/// Sql
/// </summary>
/// <remarks>CommandText of command</remarks>
public String Sql
{
get
{
return _command.CommandText;
}
}
/// <summary>
/// Fields in result
/// </summary>
public ImmutableArray<String> ResultFields
{
get
{
InitResultFields();
return _resultFields;
}
}
/// <summary>
/// Result values as dynamic object
/// </summary>
/// <remarks>
/// Each column in result has a field in dynamic object.
/// </remarks>
public dynamic ResultValues
{
get
{
InitResultValues();
return _resultValues;
}
}
/// <summary>
/// Result object of type T
/// </summary>
/// <typeparam name="TP">Type of result object</typeparam>
/// <param name="convert">convert from dynamic to T</param>
/// <returns>result object</returns>
/// <remarks>dynamic object is same as ResultValues</remarks>
public TP ResultObject<TP>(Func<dynamic,TP> convert){
return convert(ResultValues);
}
/// <summary>
/// Return enumerable of SqlResult
/// </summary>
/// <typeparam name="TP">Type of object to be enumerated</typeparam>
/// <param name="convert">Convert from dynamic to T</param>
/// <returns>Object which enumerate result of SqlResult</returns>
public IEnumerable<TP> AsEnumerable<TP>(Func<dynamic,TP> convert)
{
return new Enumerable<TP>(this, convert);
}
/// <summary>
/// Return enumerable of SqlResult as dynamic
/// </summary>
/// <returns>Object which enumerate result of SqlResult</returns>
public IEnumerable<dynamic> AsEnumerable()
{
return new Enumerable<dynamic>(this, (obj => obj ));
}
/// <summary>
/// Result values as an array of tuples
/// </summary>
/// <remarks>
/// Each tuple has name and value.
/// Name is name of column and
/// value is value of column
/// in result row
/// </remarks>
public (String name,Object value)[] ResultTuples
{
get
{
InitResultTuples();
return _resultTuples;
}
}
private SqlResult (
String sql,
P[] parameters,
C connection,
IDbTransaction transaction)
{
_command = (CMD) connection.CreateCommand();
_command.CommandText = sql;
foreach(var param in parameters){
_command.Parameters.Add(param);
}
if(transaction !=
DefaultTransaction.defaultTransaction) {
_command.Transaction = (T)transaction;
}
_allowInitialize = true;
_innerEnumerator = AsEnumerable();
}
internal SqlResult (
String sql,
P[] parameters,
C connection,
T transaction) : this( sql, parameters, connection, (IDbTransaction) transaction)
{
}
internal SqlResult (
String sql,
P[] parameters,
C connection) :
this(
sql,
parameters,
connection,
DefaultTransaction.defaultTransaction)
{
}
/// <summary>
/// Move cursor to next
/// </summary>
/// <returns>New row has values or not</returns>
public bool Next()
{
_resultValues = null;
_resultTuples = null;
_allowInitialize = true;
return _reader.Read();
}
internal void Init()
{
if (_allowInitialize)
{
if (_reader != null)
_reader.Close();
_reader = (R) _command.ExecuteReader();
_allowInitialize = false;
_resultValues = null;
_resultTuples = null;
_resultFields = emptyFields;
}
}
private void InitResultFields()
{
if (_resultFields != emptyFields)
return; //Already initialized. No need to init again.
List<string> list = new List<string>();
for(int i = 0; i < _reader.FieldCount; i ++)
{
list.Add(_reader.GetName(i));
}
_resultFields = ImmutableArray.ToImmutableArray<String>(list);
}
private void InitResultValues()
{
if (_resultValues != null)
return;
_resultValues = CreateResultValue(_reader, ResultFields);
}
private static ExpandoObject CreateResultValue(
R reader,
ImmutableArray<String> fields)
{
var values = new ExpandoObject();
for (int i = 0; i < reader.FieldCount; i++)
{
values.TryAdd(fields[i], reader.GetValue(i));
}
return values;
}
private void InitResultTuples()
{
if (_resultTuples != null)
return;
_resultTuples = CreateResultTuples(_reader, ResultFields);
}
private static (string, object)[] CreateResultTuples(
R reader,
ImmutableArray<string> resultFields)
{
var array = new (String, object)[resultFields.Length];
for(int i = 0; i < resultFields.Length; i ++)
{
array[i] = (resultFields[i], reader.GetValue(i));
}
return array;
}
internal void Close()
{
if (_reader != null)
_reader.Close();
if ( _command != null )
_command.Dispose();
}
/// <summary>
/// Dispose resources.
/// </summary>
public void Dispose()
{
Close();
}
public static dynamic[] LoadSqlResult(
String sql,
P[] parameters,
C connection,
T transaction)
{
var list = new List<dynamic>();
Database<C, T, CMD, R, P>.Query(
sql,
parameters,
connection,
transaction,
(result) => {
while (result.Next())
{
list.Add(result.ResultValues);
}
});
return list.ToArray();
}
public static dynamic[] LoadSqlResult(
String sql,
(String name, object value)[] parameters,
C connection,
T transaction)
{
return LoadSqlResult(
sql,
Database<C,T,CMD,R,P>.ConvertToDbParameter(parameters),
connection,
transaction
);
}
public static dynamic[] LoadSqlResult(
String sql,
C connection,
T transaction)
{
return LoadSqlResult(
sql,
new (String, object)[0],
connection,
transaction
);
}
public static async Task<dynamic[]> LoadSqlResultAsync(
String sql,
C connection,
T transaction)
{
return await LoadSqlResultAsync(
sql,
new (String, object)[0],
connection,
transaction);
}
public static async Task<dynamic[]> LoadSqlResultAsync(
String sql,
(String name, object value)[] parameters,
C connection,
T transaction)
{
return await LoadSqlResultAsync(
sql,
Database<C,T,CMD,R,P>.ConvertToDbParameter(parameters),
connection,
transaction
);
}
public static async Task<dynamic[]> LoadSqlResultAsync(
String sql,
P[] parameters,
C connection,
T transaction)
{
Task<dynamic[]> task = Task.Run<dynamic[]>(() =>
{
var list = new List<dynamic>();
Database<C, T, CMD, R, P>.Query(
sql,
parameters,
connection,
transaction,
(result) =>
{
while (result.Next())
{
list.Add(result.ResultValues);
}
});
return list.ToArray();
});
return await task;
}
public override IEnumerator<dynamic> GetEnumerator()
{
return _innerEnumerator.GetEnumerator();
}
private class Enumerable<TP> : IEnumerable<TP>
{
private readonly SqlResult<R,CMD,T,C,P> _sqlResult;
private readonly Func<dynamic, TP> _convert;
internal Enumerable(
SqlResult<R,CMD,T,C, P> sqlResult,
Func<dynamic, TP> converter)
{
_sqlResult = sqlResult;
_convert = converter;
}
public IEnumerator<TP> GetEnumerator()
{
_sqlResult.Init();
return new Enumerator<TP>(_sqlResult, _convert);
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
}
private class Enumerator<TP> : IEnumerator<TP>, IEnumerator
{
private SqlResult<R,CMD,T,C,P> _sqlResult;
private readonly Func<dynamic, TP> _convert;
internal Enumerator(
SqlResult<R,CMD,T,C,P> sqlResult,
Func<dynamic, TP> converter)
{
_sqlResult = sqlResult;
_convert = converter;
}
public TP Current => _sqlResult.ResultObject<TP>(_convert);
object IEnumerator.Current => _sqlResult.ResultObject<TP>(_convert);
public void Dispose()
{
_sqlResult = null;
}
public bool MoveNext()
{
return _sqlResult.Next();
}
public void Reset()
{
_sqlResult.Init();
}
}
}
}