DirectSQL/DirectSQL/SqlResult.cs at refs/heads/main · DirectSQL/DirectSQL · GitHub

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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();

}

DirectSQL/DirectSQL/SqlResult.cs at refs/heads/main · DirectSQL/DirectSQL · GitHub

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