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using Dapper;
using DuckDB.NET.Data;
using DuckDB.NET.Native;
using DuckDB.NET.Test.Helpers;
using System;
using System.Data.Common;
using System.Diagnostics;
using System.IO;
using System.Linq;
using static DuckDB.NET.Native.NativeMethods;
namespace DuckDB.NET.Samples
{
class Program
{
static void Main(string[] args)
{
if (!NativeLibraryHelper.TryLoad())
{
Console.Error.WriteLine("native assembly not found");
return;
}
DapperSample();
AdoNetSamples();
LowLevelBindingsSample();
BulkDataLoad();
}
private static void DapperSample()
{
var connectionString = "Data Source=:memory:";
using (var cn = new DuckDBConnection(connectionString))
{
cn.Open();
Console.WriteLine("DuckDB version: {0}", cn.ServerVersion);
cn.Execute("CREATE TABLE test (id INTEGER, name VARCHAR)");
var query = cn.Query<Row>("SELECT * FROM test");
Console.WriteLine("Initial count: {0}", query.Count());
cn.Execute("INSERT INTO test (id,name) VALUES (123,'test')");
query = cn.Query<Row>("SELECT * FROM test");
foreach (var q in query)
{
Console.WriteLine($"{q.Id} {q.Name}");
}
}
}
private static void AdoNetSamples()
{
if (File.Exists("file.db"))
{
File.Delete("file.db");
}
using var duckDBConnection = new DuckDBConnection("Data Source=file.db");
duckDBConnection.Open();
using var command = duckDBConnection.CreateCommand();
command.CommandText = "CREATE TABLE integers(foo INTEGER, bar INTEGER);";
var executeNonQuery = command.ExecuteNonQuery();
command.CommandText = "INSERT INTO integers VALUES (3, 4), (5, 6), (7, NULL);";
executeNonQuery = command.ExecuteNonQuery();
command.CommandText = "Select count(*) from integers";
var executeScalar = command.ExecuteScalar();
command.CommandText = "SELECT foo, bar FROM integers";
using var reader = command.ExecuteReader();
PrintQueryResults(reader);
var results = duckDBConnection.Query<FooBar>("SELECT foo, bar FROM integers");
try
{
command.CommandText = "Not a valid Sql statement";
var causesError = command.ExecuteNonQuery();
}
catch (DuckDBException e)
{
Console.WriteLine(e.Message);
}
}
private static void LowLevelBindingsSample()
{
var result = Startup.DuckDBOpen((string)null, out var database);
using (database)
{
result = Startup.DuckDBConnect(database, out var connection);
using (connection)
{
result = Query.DuckDBQuery(connection, "CREATE TABLE integers(foo INTEGER, bar INTEGER);", out _);
result = Query.DuckDBQuery(connection, "INSERT INTO integers VALUES (3, 4), (5, 6), (7, NULL);", out _);
result = Query.DuckDBQuery(connection, "SELECT foo, bar FROM integers", out var queryResult);
PrintQueryResults(queryResult);
// clean up
Query.DuckDBDestroyResult(ref queryResult);
result = PreparedStatements.DuckDBPrepare(connection, "INSERT INTO integers VALUES (?, ?)", out var insertStatement);
using (insertStatement)
{
result = PreparedStatements.DuckDBBindInt32(insertStatement, 1, 42); // the parameter index starts counting at 1!
result = PreparedStatements.DuckDBBindInt32(insertStatement, 2, 43);
result = PreparedStatements.DuckDBExecutePrepared(insertStatement, out _);
}
result = PreparedStatements.DuckDBPrepare(connection, "SELECT * FROM integers WHERE foo = ?", out var selectStatement);
using (selectStatement)
{
result = PreparedStatements.DuckDBBindInt32(selectStatement, 1, 42);
result = PreparedStatements.DuckDBExecutePrepared(selectStatement, out queryResult);
}
PrintQueryResults(queryResult);
// clean up
Query.DuckDBDestroyResult(ref queryResult);
}
}
}
private static void BulkDataLoad()
{
Stopwatch stopwatch = Stopwatch.StartNew();
if (File.Exists("file.db"))
{
File.Delete("file.db");
}
//using var connection = new DuckDBConnection("DataSource=:memory:");
using var connection = new DuckDBConnection("Data Source=file.db");
connection.Open();
using (var duckDbCommand = connection.CreateCommand())
{
var table = "CREATE TABLE AppenderTest(i INTEGER, f FLOAT, d DOUBLE,c VARCHAR);";
duckDbCommand.CommandText = table;
duckDbCommand.ExecuteNonQuery();
}
var rows = 100000;
using (var appender = connection.CreateAppender("AppenderTest"))
{
stopwatch.Start();
for (var i = 0; i < rows; i++)
{
var row = appender.CreateRow();
row
.AppendValue(i)
.AppendValue(Convert.ToSingle(i+2))
.AppendValue(Convert.ToDouble(i+4))
.AppendValue($"varchar {i.ToString()}")
.EndRow();
}
stopwatch.Stop();
}
using var command = connection.CreateCommand();
command.CommandText = "SELECT count(1) as cnt FROM AppenderTest";
using var reader1 = command.ExecuteReader();
PrintQueryResults(reader1);
command.CommandText = "SELECT * FROM AppenderTest limit 10";
using var reader2 = command.ExecuteReader();
PrintQueryResults(reader2);
Console.WriteLine($"ElapsedMilliseconds {stopwatch.ElapsedMilliseconds}");
Console.WriteLine($"connection state before {connection.State}");
Console.WriteLine($"connection state after {connection.State}");
}
private static void PrintQueryResults(DbDataReader queryResult)
{
for (var index = 0; index < queryResult.FieldCount; index++)
{
var column = queryResult.GetName(index);
Console.Write($"{column} ");
}
Console.WriteLine();
while (queryResult.Read())
{
for (int ordinal = 0; ordinal < queryResult.FieldCount; ordinal++)
{
if (queryResult.IsDBNull(ordinal))
{
Console.WriteLine("NULL");
continue;
}
var val = queryResult.GetValue(ordinal);
Console.Write(val);
Console.Write(" ");
}
Console.WriteLine();
}
}
private static void PrintQueryResults(DuckDBResult queryResult)
{
var columnCount = (int)Query.DuckDBColumnCount(ref queryResult);
for (var index = 0; index < columnCount; index++)
{
var columnName = Query.DuckDBColumnName(ref queryResult, index);
Console.Write($"{columnName} ");
}
Console.WriteLine();
var rowCount = Query.DuckDBRowCount(ref queryResult);
for (long row = 0; row < rowCount; row++)
{
for (long column = 0; column < columnCount; column++)
{
var val = Types.DuckDBValueInt32(ref queryResult, column, row);
Console.Write(val);
Console.Write(" ");
}
Console.WriteLine();
}
}
}
class FooBar
{
public int Foo { get; set; }
public int Bar { get; set; }
}
class Row
{
public int Id { get; set; }
public string Name { get; set; }
}
}
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