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Insert.cs
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using System.Text;
using BenchmarkDotNet.Attributes;
using NpgsqlTypes;
namespace Npgsql.Benchmarks;
public class Insert
{
NpgsqlConnection _conn = default!;
NpgsqlCommand _truncateCmd = default!;
[Params(1, 100, 1000, 10000)]
public int BatchSize { get; set; }
[GlobalSetup]
public void GlobalSetup()
{
var connString = new NpgsqlConnectionStringBuilder(BenchmarkEnvironment.ConnectionString)
{
Pooling = false
}.ToString();
_conn = new NpgsqlConnection(connString);
_conn.Open();
using (var cmd = new NpgsqlCommand("CREATE TEMP TABLE data (int1 INT4, text1 TEXT, int2 INT4, text2 TEXT)", _conn))
cmd.ExecuteNonQuery();
_truncateCmd = new NpgsqlCommand("TRUNCATE data", _conn);
}
[GlobalCleanup]
public void GlobalCleanup() => _conn.Close();
[Benchmark(Baseline = true)]
public void Unbatched()
{
var cmd = new NpgsqlCommand("INSERT INTO data VALUES (@p0, @p1, @p2, @p3)", _conn);
cmd.Parameters.AddWithValue("p0", NpgsqlDbType.Integer, 8);
cmd.Parameters.AddWithValue("p1", NpgsqlDbType.Text, "foo");
cmd.Parameters.AddWithValue("p2", NpgsqlDbType.Integer, 9);
cmd.Parameters.AddWithValue("p3", NpgsqlDbType.Text, "bar");
cmd.Prepare();
for (var i = 0; i < BatchSize; i++)
cmd.ExecuteNonQuery();
_truncateCmd.ExecuteNonQuery();
}
[Benchmark]
public void Batched()
{
var cmd = new NpgsqlCommand { Connection = _conn };
var sb = new StringBuilder();
for (var i = 0; i < BatchSize; i++)
{
var p1 = (i * 4).ToString();
var p2 = (i * 4 + 1).ToString();
var p3 = (i * 4 + 2).ToString();
var p4 = (i * 4 + 3).ToString();
sb.Append("INSERT INTO data VALUES (@").Append(p1).Append(", @").Append(p2).Append(", @").Append(p3).Append(", @").Append(p4).Append(");");
cmd.Parameters.AddWithValue(p1, NpgsqlDbType.Integer, 8);
cmd.Parameters.AddWithValue(p2, NpgsqlDbType.Text, "foo");
cmd.Parameters.AddWithValue(p3, NpgsqlDbType.Integer, 9);
cmd.Parameters.AddWithValue(p4, NpgsqlDbType.Text, "bar");
}
cmd.CommandText = sb.ToString();
cmd.Prepare();
cmd.ExecuteNonQuery();
_truncateCmd.ExecuteNonQuery();
}
[Benchmark]
public void Copy()
{
using (var s = _conn.BeginBinaryImport("COPY data (int1, text1, int2, text2) FROM STDIN BINARY"))
{
for (var i = 0; i < BatchSize; i++)
{
s.StartRow();
s.Write(8);
s.Write("foo");
s.Write(9);
s.Write("bar");
}
}
_truncateCmd.ExecuteNonQuery();
}
}