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AutoPrepareTests.cs
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375 lines (333 loc) · 15 KB
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using NpgsqlTypes;
using NUnit.Framework;
namespace Npgsql.Tests
{
public class AutoPrepareTests : TestBase
{
[Test]
public void Basic()
{
var csb = new NpgsqlConnectionStringBuilder(ConnectionString)
{
MaxAutoPrepare = 10,
AutoPrepareMinUsages = 2
};
using (var conn = OpenConnection(csb))
using (var checkCmd = new NpgsqlCommand(CountPreparedStatements, conn))
{
checkCmd.Prepare();
conn.ExecuteNonQuery("SELECT 1");
Assert.That(checkCmd.ExecuteScalar(), Is.EqualTo(0));
using (var cmd = new NpgsqlCommand("SELECT 1", conn))
{
cmd.ExecuteScalar();
Assert.That(cmd.IsPrepared, Is.True);
Assert.That(checkCmd.ExecuteScalar(), Is.EqualTo(1));
cmd.ExecuteScalar();
Assert.That(cmd.IsPrepared, Is.True);
Assert.That(checkCmd.ExecuteScalar(), Is.EqualTo(1));
}
using (var cmd = new NpgsqlCommand("SELECT 1", conn))
{
cmd.ExecuteScalar();
Assert.That(cmd.IsPrepared, Is.True);
}
Assert.That(checkCmd.ExecuteScalar(), Is.EqualTo(1));
conn.UnprepareAll();
}
}
[Test, Description("Passes the maximum limit for autoprepared statements, recycling the least-recently used one")]
public void Recycle()
{
var csb = new NpgsqlConnectionStringBuilder(ConnectionString)
{
AutoPrepareMinUsages = 2,
MaxAutoPrepare = 2
};
using (var conn = OpenConnection(csb))
using (var checkCmd = new NpgsqlCommand(CountPreparedStatements, conn))
{
checkCmd.Prepare();
Assert.That(checkCmd.ExecuteScalar(), Is.EqualTo(0));
var cmd1 = new NpgsqlCommand("SELECT 1", conn);
cmd1.ExecuteNonQuery(); cmd1.ExecuteNonQuery();
Assert.That(cmd1.IsPrepared, Is.True);
Assert.That(checkCmd.ExecuteScalar(), Is.EqualTo(1));
Thread.Sleep(10);
var cmd2 = new NpgsqlCommand("SELECT 2", conn);
cmd2.ExecuteNonQuery(); cmd2.ExecuteNonQuery();
Assert.That(cmd2.IsPrepared, Is.True);
Assert.That(checkCmd.ExecuteScalar(), Is.EqualTo(2));
// Use cmd1 to make cmd2 the lru
Thread.Sleep(1);
cmd1.ExecuteNonQuery();
// Cause another statement to be autoprepared. This should eject cmd2.
conn.ExecuteNonQuery("SELECT 3"); conn.ExecuteNonQuery("SELECT 3");
Assert.That(checkCmd.ExecuteScalar(), Is.EqualTo(2));
cmd2.ExecuteNonQuery();
Assert.That(cmd2.IsPrepared, Is.False);
using (var getTextCmd = new NpgsqlCommand("SELECT statement FROM pg_prepared_statements WHERE statement NOT LIKE '%COUNT%' ORDER BY statement", conn))
using (var reader = getTextCmd.ExecuteReader())
{
Assert.That(reader.Read(), Is.True);
Assert.That(reader.GetString(0), Is.EqualTo("SELECT 1"));
Assert.That(reader.Read(), Is.True);
Assert.That(reader.GetString(0), Is.EqualTo("SELECT 3"));
}
conn.UnprepareAll();
}
}
[Test]
public void Persist()
{
var connString = new NpgsqlConnectionStringBuilder(ConnectionString)
{
ApplicationName = nameof(Persist),
MaxAutoPrepare = 10,
AutoPrepareMinUsages = 2
}.ToString();
try
{
using (var conn = OpenConnection(connString))
using (var checkCmd = new NpgsqlCommand(CountPreparedStatements, conn))
{
checkCmd.Prepare();
conn.ExecuteNonQuery("SELECT 1"); conn.ExecuteNonQuery("SELECT 1");
Assert.That(checkCmd.ExecuteScalar(), Is.EqualTo(1));
}
// We now have two prepared statements which should be persisted
using (var conn = OpenConnection(connString))
using (var checkCmd = new NpgsqlCommand(CountPreparedStatements, conn))
{
checkCmd.Prepare();
Assert.That(checkCmd.ExecuteScalar(), Is.EqualTo(1));
using (var cmd = new NpgsqlCommand("SELECT 1", conn))
{
cmd.ExecuteScalar();
//Assert.That(cmd.IsPrepared);
}
Assert.That(checkCmd.ExecuteScalar(), Is.EqualTo(1));
}
}
finally
{
using (var conn = new NpgsqlConnection(connString))
NpgsqlConnection.ClearPool(conn);
}
}
[Test]
public void PromoteAutoToExplicit()
{
var csb = new NpgsqlConnectionStringBuilder(ConnectionString)
{
MaxAutoPrepare = 10,
AutoPrepareMinUsages = 2
};
using (var conn = OpenConnection(csb))
using (var checkCmd = new NpgsqlCommand(CountPreparedStatements, conn))
using (var cmd1 = new NpgsqlCommand("SELECT 1", conn))
using (var cmd2 = new NpgsqlCommand("SELECT 1", conn))
{
checkCmd.Prepare();
cmd1.ExecuteNonQuery(); cmd1.ExecuteNonQuery();
// cmd1 is now autoprepared
Assert.That(checkCmd.ExecuteScalar(), Is.EqualTo(1));
Assert.That(conn.Connector.PreparedStatementManager.NumPrepared, Is.EqualTo(2));
// Promote (replace) the autoprepared statement with an explicit one.
cmd2.Prepare();
Assert.That(checkCmd.ExecuteScalar(), Is.EqualTo(1));
Assert.That(conn.Connector.PreparedStatementManager.NumPrepared, Is.EqualTo(2));
// cmd1's statement is no longer valid (has been closed), make sure it still works (will run unprepared)
cmd2.ExecuteScalar();
conn.UnprepareAll();
}
}
[Test]
public void CandidateEject()
{
var csb = new NpgsqlConnectionStringBuilder(ConnectionString)
{
MaxAutoPrepare = 10,
AutoPrepareMinUsages = 3
};
using (var conn = OpenConnection(csb))
using (var cmd = new NpgsqlCommand())
{
cmd.Connection = conn;
for (var i = 0; i < PreparedStatementManager.CandidateCount; i++)
{
cmd.CommandText = $"SELECT {i}";
cmd.ExecuteNonQuery();
Thread.Sleep(1);
}
// The candidate list is now full with single-use statements.
cmd.CommandText = $"SELECT 'double_use'";
cmd.ExecuteNonQuery(); cmd.ExecuteNonQuery();
// We now have a single statement that has been used twice.
for (var i = PreparedStatementManager.CandidateCount; i < PreparedStatementManager.CandidateCount * 2; i++)
{
cmd.CommandText = $"SELECT {i}";
cmd.ExecuteNonQuery();
Thread.Sleep(1);
}
// The new single-use statements should have ejected all previous single-use statements
cmd.CommandText = "SELECT 1";
cmd.ExecuteNonQuery(); cmd.ExecuteNonQuery();
Assert.That(cmd.IsPrepared, Is.False);
// But the double-use statement should still be there
cmd.CommandText = "SELECT 'double_use'";
cmd.ExecuteNonQuery();
Assert.That(cmd.IsPrepared, Is.True);
conn.UnprepareAll();
}
}
[Test]
public void OneCommandSameSqlTwice()
{
var csb = new NpgsqlConnectionStringBuilder(ConnectionString)
{
MaxAutoPrepare = 10,
AutoPrepareMinUsages = 2
};
using (var conn = OpenConnection(csb))
using (var checkCmd = new NpgsqlCommand(CountPreparedStatements, conn))
using (var cmd = new NpgsqlCommand("SELECT 1; SELECT 1; SELECT 1; SELECT 1", conn))
{
cmd.Prepare();
Assert.That(cmd.IsPrepared, Is.True);
cmd.ExecuteNonQuery();
Assert.That(checkCmd.ExecuteScalar(), Is.EqualTo(1));
conn.UnprepareAll();
}
}
[Test]
public void AcrossCloseOpenDifferentConnector()
{
var connString = new NpgsqlConnectionStringBuilder(ConnectionString)
{
ApplicationName = nameof(AutoPrepareTests) + '.' + nameof(AcrossCloseOpenDifferentConnector),
MaxAutoPrepare = 10,
AutoPrepareMinUsages = 2
}.ToString();
using (var conn1 = new NpgsqlConnection(connString))
using (var conn2 = new NpgsqlConnection(connString))
using (var cmd = new NpgsqlCommand("SELECT 1", conn1))
{
conn1.Open();
cmd.ExecuteNonQuery(); cmd.ExecuteNonQuery();
Assert.That(cmd.IsPrepared, Is.True);
var processId = conn1.ProcessID;
conn1.Close();
conn2.Open();
conn1.Open();
Assert.That(conn1.ProcessID, Is.Not.EqualTo(processId));
Assert.That(cmd.IsPrepared, Is.False);
Assert.That(cmd.ExecuteScalar(), Is.EqualTo(1)); // Execute unprepared
cmd.Prepare();
Assert.That(cmd.ExecuteScalar(), Is.EqualTo(1));
NpgsqlConnection.ClearPool(conn1);
}
}
[Test]
public void UnprepareAll()
{
var csb = new NpgsqlConnectionStringBuilder(ConnectionString)
{
MaxAutoPrepare = 10,
AutoPrepareMinUsages = 2
};
using (var conn = OpenConnection(csb))
using (var cmd = new NpgsqlCommand("SELECT 1", conn))
{
cmd.Prepare(); // Explicit
conn.ExecuteNonQuery("SELECT 2"); conn.ExecuteNonQuery("SELECT 2"); // Auto
Assert.That(conn.ExecuteScalar(CountPreparedStatements), Is.EqualTo(2));
conn.UnprepareAll();
Assert.That(conn.ExecuteScalar(CountPreparedStatements), Is.Zero);
}
}
[Test, Description("Prepares the same SQL with different parameters (overloading)")]
public void OverloadedSql()
{
var csb = new NpgsqlConnectionStringBuilder(ConnectionString)
{
MaxAutoPrepare = 10,
AutoPrepareMinUsages = 2
};
using (var conn = OpenConnection(csb))
{
using (var cmd = new NpgsqlCommand("SELECT @p", conn))
{
cmd.Parameters.AddWithValue("p", NpgsqlDbType.Integer, 8);
cmd.ExecuteNonQuery(); cmd.ExecuteNonQuery();
Assert.That(cmd.IsPrepared, Is.True);
}
using (var cmd = new NpgsqlCommand("SELECT @p", conn))
{
cmd.Parameters.AddWithValue("p", NpgsqlDbType.Text, "foo");
Assert.That(cmd.ExecuteScalar(), Is.EqualTo("foo"));
Assert.That(cmd.ExecuteScalar(), Is.EqualTo("foo"));
Assert.That(cmd.IsPrepared, Is.False);
}
// SQL overloading is a pretty rare/exotic scenario. Handling it properly would involve keying
// prepared statements not just by SQL but also by the parameter types, which would pointlessly
// increase allocations. Instead, the second execution simply reuns unprepared
Assert.That(conn.ExecuteScalar("SELECT COUNT(*) FROM pg_prepared_statements"), Is.EqualTo(1));
conn.UnprepareAll();
}
}
#if !NETCOREAPP1_1
[Test, Description("Tests parameter derivation a parameterized query (CommandType.Text) that is already auto-prepared.")]
public void DeriveParametersForAutoPreparedStatement()
{
const string query = "SELECT @p::integer";
const int answer = 42;
var csb = new NpgsqlConnectionStringBuilder(ConnectionString)
{
MaxAutoPrepare = 10,
AutoPrepareMinUsages = 2
};
using (var conn = OpenConnection(csb))
using (var checkCmd = new NpgsqlCommand(CountPreparedStatements, conn))
using (var cmd = new NpgsqlCommand(query, conn))
{
checkCmd.Prepare();
cmd.Parameters.AddWithValue("@p", NpgsqlDbType.Integer, answer);
cmd.ExecuteNonQuery(); cmd.ExecuteNonQuery(); // cmd1 is now autoprepared
Assert.That(checkCmd.ExecuteScalar(), Is.EqualTo(1));
Assert.That(conn.Connector.PreparedStatementManager.NumPrepared, Is.EqualTo(2));
// Derive parameters for the already autoprepared statement
NpgsqlCommandBuilder.DeriveParameters(cmd);
Assert.That(cmd.Parameters.Count, Is.EqualTo(1));
Assert.That(cmd.Parameters[0].ParameterName, Is.EqualTo("p"));
// DeriveParameters should have silently unprepared the autoprepared statements
Assert.That(checkCmd.ExecuteScalar(), Is.EqualTo(0));
Assert.That(conn.Connector.PreparedStatementManager.NumPrepared, Is.EqualTo(1));
cmd.Parameters["@p"].Value = answer;
Assert.That(cmd.ExecuteScalar(), Is.EqualTo(answer));
conn.UnprepareAll();
}
}
#endif
// Exclude some internal Npgsql queries which include pg_type as well as the count statement itself
const string CountPreparedStatements = @"
SELECT COUNT(*) FROM pg_prepared_statements
WHERE statement NOT LIKE '%pg_prepared_statements%'
AND statement NOT LIKE '%pg_type%'";
void DumpPreparedStatements(NpgsqlConnection conn)
{
using (var cmd = new NpgsqlCommand("SELECT name,statement FROM pg_prepared_statements", conn))
using (var reader = cmd.ExecuteReader())
{
while (reader.Read())
Console.WriteLine($"{reader.GetString(0)}: {reader.GetString(1)}");
}
}
}
}