public string GetQualifiedTableNameOrToString()
{
if (string.IsNullOrEmpty(this.WhereCommand))
{
if (string.IsNullOrEmpty(this.OrderByCommand))
{
if (string.IsNullOrEmpty(this.LimitCommand))
{
if (string.IsNullOrEmpty(this.GroupByCommand))
{
if (this.FromCommand == "from `" + Strategy.GetDescriptor().GetQualifiedTableName() + "`")
{
if (this.SelectCommand == Strategy.GetDescriptor().GetSelectAllColumnsText())
{
return("`" + Strategy.GetDescriptor().GetQualifiedTableName() + "`");
}
}
}
}
}
}
return("(\n" + this.ToString() + ")");
}
public static double Sum <TElement>(this IQueryStrategy <TElement> Strategy, Expression <Func <TElement, double> > selector)
{
// http://stackoverflow.com/questions/3785995/sqlite-accumulator-sum-column-in-a-select-statement
// http://www.tutorialspoint.com/sqlite/sqlite_useful_functions.htm
//throw new NotImplementedException("sqlite does not have it yet");
// http://sqlite.1065341.n5.nabble.com/SUM-and-NULL-values-td2257.html
var body = ((MemberExpression)((LambdaExpression)selector).Body);
// do we need to check our db schema or is reflection the schema for us?
#region ColumnName
var ColumnName = "";
ColumnName = body.Member.Name;
#endregion
return(((Task <double>)Strategy.GetDescriptor().GetWithConnection()(
c =>
{
var state = QueryStrategyExtensions.AsCommandBuilder(Strategy);
// override
state.SelectCommand = "select sum(`" + ColumnName + "`) ";
//var cmd = new SQLiteCommand(state.ToString(), c);
var cmd = c.CreateCommand(state.ToString());
foreach (var item in state.ApplyParameter)
{
item(cmd);
}
var s = new TaskCompletionSource <double>();
s.SetResult(
(double)cmd.ExecuteScalar()
);
//var r = cmd.ExecuteReader();
//if (r.NextResult())
//{
// //ex = {"No current row"}
// s.SetResult(
// r.GetInt64(0)
// );
//}
return s.Task;
}
)).Result);
}
public static TResult Min <TElement, TResult>(this IQueryStrategy <TElement> Strategy, Expression <Func <TElement, TResult> > selector)
{
// X:\jsc.svn\examples\javascript\LINQ\MinMaxAverageExperiment\MinMaxAverageExperiment\ApplicationWebService.cs
return(((Task <TResult>)Strategy.GetDescriptor().GetWithConnection()(
c =>
{
// http://stackoverflow.com/questions/3785995/sqlite-accumulator-sum-column-in-a-select-statement
// http://www.tutorialspoint.com/sqlite/sqlite_useful_functions.htm
// http://sqlite.1065341.n5.nabble.com/SUM-and-NULL-values-td2257.html
var body = ((MemberExpression)((LambdaExpression)selector).Body);
// do we need to check our db schema or is reflection the schema for us?
#region ColumnName
var ColumnName = "";
ColumnName = body.Member.Name;
#endregion
var state = QueryStrategyExtensions.AsCommandBuilder(Strategy);
// override
state.SelectCommand = "select min(`" + ColumnName + "`) ";
//var cmd = new SQLiteCommand(state.ToString(), c);
var cmd = c.CreateCommand(state.ToString());
foreach (var item in state.ApplyParameter)
{
item(cmd);
}
var s = new TaskCompletionSource <TResult>();
// will it compile to java???
s.SetResult(
(TResult)cmd.ExecuteScalar()
);
//var r = cmd.ExecuteReader();
//if (r.NextResult())
//{
// //ex = {"No current row"}
// s.SetResult(
// r.GetInt64(0)
// );
//}
return s.Task;
}
)).Result);
}
public static IQueryStrategy <TElement> Where <TElement>(this IQueryStrategy <TElement> source, Expression <Func <TElement, bool> > filter)
{
// which thread are we running on?
// X:\jsc.svn\examples\javascript\appengine\AppEngineUserAgentLoggerWithXSLXAsset\AppEngineUserAgentLoggerWithXSLXAsset\ApplicationWebService.cs
Console.WriteLine("enter Where");
var xINestedQueryStrategy = source is INestedQueryStrategy;
if (!xINestedQueryStrategy)
{
// lets mark it as nestable, this allows where to know how to aviod name clashes.
// X:\jsc.svn\examples\javascript\linq\test\TestGroupByCountViaScalarWhere\TestGroupByCountViaScalarWhere\ApplicationWebService.cs
// https://sites.google.com/a/jsc-solutions.net/backlog/knowledge-base/2014/201406/20140607
// first step being immputable for where clauses
var that = new WhereQueryStrategy <TElement>
{
source = source,
filter = filter,
InternalGetElementType =
delegate
{
return(source.GetElementType());
},
InternalGetDescriptor =
() =>
{
// inherit the connection/context from above
var StrategyDescriptor = source.GetDescriptor();
return(StrategyDescriptor);
}
};
MutableWhere(
that, filter
);
return(that);
}
MutableWhere(
source, filter
);
return(source);
}
// X:\jsc.svn\examples\javascript\LINQ\MashableVelocityGraph\MashableVelocityGraph\ApplicationWebService.cs
//[Obsolete("this is the first method we made generic. would it work for a group now?")]
//public static long Count<TElement>(this IQueryStrategy<TElement> Strategy)
public static long Count(this IQueryStrategy Strategy)
{
return(((Task <long>)Strategy.GetDescriptor().GetWithConnection()(
c =>
{
var state = QueryStrategyExtensions.AsCommandBuilder(Strategy);
// override
state.SelectCommand = "select count(*)";
var cmd = c.CreateCommand(state.ToString());
foreach (var item in state.ApplyParameter)
{
item(cmd);
}
var s = new TaskCompletionSource <long>();
s.SetResult((long)cmd.ExecuteScalar());
return s.Task;
}
)).Result);
}
static DataTable InternalAsDataTable(IQueryStrategy Strategy)
{
// X:\jsc.svn\examples\javascript\forms\Test\TestSQLiteGroupBy\TestSQLiteGroupBy\ApplicationWebService.cs
// will it work for jvm?
var st = new StackTrace(0, true);
var sw = Stopwatch.StartNew();
Console.WriteLine("AsDataTable " + new { Strategy });
if (Strategy == null)
{
if (Debugger.IsAttached)
{
Debugger.Break();
}
throw new ArgumentNullException("Strategy");
}
//System.Diagnostics.Contracts.Contract.Assume
var value = ((Task <DataTable>)Strategy.GetDescriptor().GetWithConnection()(
c =>
{
var state = QueryStrategyExtensions.AsCommandBuilder(Strategy);
//var cmd = new SQLiteCommand(state.ToString(), c);
var cmd = (DbCommand)c.CreateCommand();
//ex = {"no such column: dealer.Key"}
cmd.CommandText = state.ToString();
// https://sites.google.com/a/jsc-solutions.net/backlog/knowledge-base/2014/201405/20140501
foreach (var item in state.ApplyParameter)
{
item(cmd);
}
// X:\jsc.svn\core\ScriptCoreLib\Shared\BCLImplementation\System\Data\Common\DbDataAdapter.cs
// will this work under CLR too?
// http://stackoverflow.com/questions/12608025/how-to-construct-a-sqlite-query-to-group-by-order
// http://www.devart.com/dotconnect/sqlite/docs/Devart.Data.SQLite~Devart.Data.SQLite.SQLiteDataReader~NextResult.html
// http://www.maplesoft.com/support/help/Maple/view.aspx?path=Database/Statement/NextResult
// To issue a multi-statement SQL string, the Execute command must be used.
// Some databases may require that the processing of the current result be completed before the next result is returned by NextResult.
// http://www.java2s.com/Tutorial/CSharp/0560__ADO.Net/ExecutingaQueryThatReturnsMultipleResultSetswithSqlDataReader.htm
// http://amitchandnz.wordpress.com/2011/09/28/issues-with-idatareaderdatareader-multiple-results-sets-and-datatables/
// http://stuff.mit.edu/afs/athena/software/mono_v3.0/arch/i386_linux26/mono/mcs/class/Mono.Data.Sqlite/Mono.Data.Sqlite_2.0/SQLiteDataReader.cs
// http://zetcode.com/db/sqlitecsharp/read/
// http://stackoverflow.com/questions/18493169/sqlite-query-combining-two-result-sets-that-use-and
// http://www.sqlite.org/queryplanner.html
// One possible solution is to fetch all events, to a ToList() and do the grouping in-memory.
// http://blog.csainty.com/2008/01/linq-to-sql-groupby.html
// http://msdn.microsoft.com/en-us/library/vstudio/bb386922(v=vs.100).aspx
//var reader = cmd.ExecuteReader();
////var reader = cmd.ExecuteReader();
////Console.WriteLine(
//// new
//// {
//// reader.Depth,
//// reader.FieldCount
//// //reader.NextResult
//// }
////);
//var a = new SQLiteDataAdapter(cmd);
// http://msdn.microsoft.com/en-us/library/bh8kx08z(v=vs.110).aspx
var a = new __DbDataAdapter {
SelectCommand = cmd
};
//var a = new SQLiteDataAdapter { SelectCommand = cmd };
//System.Data.XSQLite.dll!Community.CsharpSqlite.Sqlite3.fetchPayload(Community.CsharpSqlite.Sqlite3.BtCursor pCur, ref int pAmt, ref int outOffset, bool skipKey) Unknown
//System.Data.XSQLite.dll!Community.CsharpSqlite.Sqlite3.sqlite3BtreeKeyFetch(Community.CsharpSqlite.Sqlite3.BtCursor pCur, ref int pAmt, ref int outOffset) Unknown
//System.Data.XSQLite.dll!Community.CsharpSqlite.Sqlite3.sqlite3VdbeExec(Community.CsharpSqlite.Sqlite3.Vdbe p) Unknown
//System.Data.XSQLite.dll!Community.CsharpSqlite.Sqlite3.sqlite3Step(Community.CsharpSqlite.Sqlite3.Vdbe p) Unknown
//System.Data.XSQLite.dll!Community.CsharpSqlite.Sqlite3.sqlite3_step(Community.CsharpSqlite.Sqlite3.Vdbe pStmt) Unknown
//System.Data.XSQLite.dll!System.Data.SQLite.SQLiteCommand.ExecuteStatement(Community.CsharpSqlite.Sqlite3.Vdbe pStmt, out int cols, out System.IntPtr pazValue, out System.IntPtr pazColName) Unknown
//System.Data.XSQLite.dll!System.Data.SQLite.SQLiteDataReader.ReadpVm(Community.CsharpSqlite.Sqlite3.Vdbe pVm, int version, System.Data.SQLite.SQLiteCommand cmd) Unknown
//System.Data.XSQLite.dll!System.Data.SQLite.SQLiteDataReader.SQLiteDataReader(System.Data.SQLite.SQLiteCommand cmd, Community.CsharpSqlite.Sqlite3.Vdbe pVm, int version) Unknown
//System.Data.XSQLite.dll!System.Data.SQLite.SQLiteCommand.ExecuteReader(System.Data.CommandBehavior behavior, bool want_results, out int rows_affected) Unknown
//System.Data.XSQLite.dll!System.Data.SQLite.SQLiteCommand.ExecuteReader(System.Data.CommandBehavior behavior) Unknown
//System.Data.XSQLite.dll!System.Data.SQLite.SQLiteCommand.ExecuteDbDataReader(System.Data.CommandBehavior behavior) Unknown
//System.Data.dll!System.Data.Common.DbCommand.ExecuteReader() Unknown
//ScriptCoreLib.dll!ScriptCoreLib.Shared.BCLImplementation.System.Data.Common.__DbDataAdapter.Fill(System.Data.DataTable dataTable) Unknown
var ss = Stopwatch.StartNew();
Console.WriteLine("before Fill");
var t = new DataTable();
//var ds = new DataSet();
a.Fill(t);
// is SQLIte Fill handicapped or what?
//a.Fill(ds);
//Console.WriteLine("after Fill " + new { ss.ElapsedMilliseconds, t.Rows.Count });
Console.WriteLine("after Fill " + new { ss.ElapsedMilliseconds });
var s = new TaskCompletionSource <DataTable>();
//s.SetResult(ds.Tables[0]);
s.SetResult(t);
return(s.Task);
}
)).Result;
var caller = st.GetFrame(1);
Console.WriteLine(
Process.GetCurrentProcess().Id.ToString("x4") + ":"
+ Thread.CurrentThread.ManagedThreadId.ToString("x4")
+ " AsDataTable " + new { sw.ElapsedMilliseconds, Debugger.IsAttached, caller = caller.ToString() });
return(value);
}