ServiceStack.Ormlite for sqlite运行时间非常慢

Question

I am using ServerStack.OrmLite 4.0 on Windows 7. I created a table with OrmLite and inserted about 100 rows of data on a Sqlite file. The time of the Db.Select() took about 1 minute. When I changed the database to mysql, it returns the result instantly. I also tried access the sqlite database using another GUI software, and tried execute some sql statements and they all worked fine. Does anybody have any clue?

Updated With Code:

static void Main(string[] args)
    {
        string dbName = "testdb.sqlite";
        var path = System.IO.Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
        if (!System.IO.File.Exists(path + "/" + dbName))
        { 
            System.IO.File.Create(path + "/" + dbName).Dispose();
        }
        var dbFacory = new OrmLiteConnectionFactory("Data Source=./testdb.sqlite;Version=3;UTF8Encoding=True;", SqliteDialect.Provider);
        //var dbFacory = new OrmLiteConnectionFactory(":memory:", SqliteDialect.Provider);
        var db = dbFacory.OpenDbConnection();
        db.DropAndCreateTable<TestTable>();
        db.DropAndCreateTable<BasicPersonnelInfo>();

        Console.WriteLine("Starts at : {0}", DateTime.Now.Second);
        for (int i = 0; i < 100; i++)
        {
            db.Insert<TestTable>(new TestTable { TestField = i.ToString()});
            db.Insert<BasicPersonnelInfo>(new BasicPersonnelInfo { Test3 = i.ToString()});
        }
        Console.WriteLine("Inserting Completed;");
        Console.WriteLine("Select at : {0}", DateTime.Now.Second);
        db.Select<BasicPersonnelInfo>();
        Console.WriteLine("Ends   at : {0}", DateTime.Now.Second);
        Console.WriteLine("Prese anykey to quit!");
        Console.ReadKey();
    }

Answer 1

If you're saving SQLite to disk, I've seen really long running times due to file permission, if you're running in ASP.NET your SQLite database should be saved in your ~/App_Data folder and should be given write permissions to IIS_USR User Account.

To provide some idea of the expected time it should take I've added a Simple Insert/Select Benchmark that inserts and selects 100 rows in a table containing 20 string columns for both SQLite in memory:

var dbFactory = new OrmLiteConnectionFactory(":memory:", SqliteDialect.Provider);
using (var db = dbFactory.Open())
{
    db.DropAndCreateTable<TableWithStrings>();

    var sw = Stopwatch.StartNew();
    for (int i = 0; i < 100; i++)
    {
        var row = TableWithStrings.Create(i);
        db.Insert(row);
    }
    "[:memory:] Time to INSERT 100 rows: {0}ms".Print(sw.ElapsedMilliseconds);

    sw = Stopwatch.StartNew();
    var rows = db.Select<TableWithStrings>();
    "[:memory:] Time to SELECT {0} rows: {1}ms".Print(rows.Count, sw.ElapsedMilliseconds);
}

And an SQLite File Database:

var dbPath = "~/App_Data/db.sqlite".MapProjectPath();
var dbFactory = new OrmLiteConnectionFactory(dbPath, SqliteDialect.Provider);
using (var db = dbFactory.Open())
{
    db.DropAndCreateTable<TableWithStrings>();

    var sw = Stopwatch.StartNew();
    for (int i = 0; i < 100; i++)
    {
        var row = TableWithStrings.Create(i);
        db.Insert(row);
    }
    "[db.sqlite] Time to INSERT 100 rows: {0}ms".Print(sw.ElapsedMilliseconds);

    sw = Stopwatch.StartNew();
    var rows = db.Select<TableWithStrings>();
    "[db.sqlite] Time to SELECT {0} rows: {1}ms".Print(rows.Count, sw.ElapsedMilliseconds);
}

Running this as a R# NUnit test inside VS.NET 2015 on my 2013 Macbook Pro workstation (with 4 VS instances and multiple RDBMS's running in background) results in:

[:memory:] Time to INSERT 100 rows: 10ms
[:memory:] Time to SELECT 100 rows: 1ms

And for SQLite file database:

[db.sqlite] Time to INSERT 100 rows: 659ms
[db.sqlite] Time to SELECT 100 rows: 13ms

Whilst this isn't a proper benchmark (ie no warm-up, not in Console App w/ more iterations), it should provide some indication on expected results. Note OrmLite tests use the ServiceStack.OrmLite.Sqlite.Mono version of OrmLite SQLite.