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TypeMapperTests.cs
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using System;
using System.Data;
using System.Threading.Tasks;
using Npgsql.BackendMessages;
using Npgsql.Internal;
using Npgsql.Internal.TypeHandlers;
using Npgsql.Internal.TypeHandlers.NumericHandlers;
using Npgsql.Internal.TypeHandling;
using Npgsql.PostgresTypes;
using Npgsql.TypeMapping;
using NpgsqlTypes;
using NUnit.Framework;
using static Npgsql.Tests.TestUtil;
namespace Npgsql.Tests
{
[NonParallelizable]
public class TypeMapperTests : TestBase
{
[Test]
public void GlobalMapping()
{
var myFactory = MapMyIntGlobally();
using var pool = CreateTempPool(ConnectionString, out var connectionString);
using var conn = OpenConnection(connectionString);
using var cmd = new NpgsqlCommand("SELECT @p", conn);
var range = new NpgsqlRange<int>(8, true, false, 0, false, true);
var parameters = new[]
{
// Base
new NpgsqlParameter("p", NpgsqlDbType.Integer) { Value = 8 },
new NpgsqlParameter("p", DbType.Int32) { Value = 8 },
new NpgsqlParameter { ParameterName = "p", Value = 8 },
// Array
new NpgsqlParameter { ParameterName = "p", Value = new[] { 8 } },
new NpgsqlParameter("p", NpgsqlDbType.Array | NpgsqlDbType.Integer) { Value = new[] { 8 } },
// Range
new NpgsqlParameter { ParameterName = "p", Value = range },
new NpgsqlParameter("p", NpgsqlDbType.Range | NpgsqlDbType.Integer) { Value = range },
};
for (var i = 0; i < parameters.Length; i++)
{
cmd.Parameters.Add(parameters[i]);
cmd.ExecuteScalar();
Assert.That(myFactory.Reads, Is.EqualTo(i+1));
Assert.That(myFactory.Writes, Is.EqualTo(i+1));
cmd.Parameters.Clear();
}
}
[Test]
public void LocalMapping()
{
MyInt32HandlerFactory myFactory;
using var _ = CreateTempPool(ConnectionString, out var connectionString);
using (var conn = OpenConnection(connectionString))
using (var cmd = new NpgsqlCommand("SELECT @p", conn))
{
myFactory = MapMyIntLocally(conn);
cmd.Parameters.AddWithValue("p", 8);
cmd.ExecuteScalar();
Assert.That(myFactory.Reads, Is.EqualTo(1));
Assert.That(myFactory.Writes, Is.EqualTo(1));
}
// Make sure reopening (same physical connection) reverts the mapping
using (var conn = OpenConnection(connectionString))
using (var cmd = new NpgsqlCommand("SELECT @p", conn))
{
cmd.Parameters.AddWithValue("p", 8);
cmd.ExecuteScalar();
Assert.That(myFactory.Reads, Is.EqualTo(1));
Assert.That(myFactory.Writes, Is.EqualTo(1));
}
}
[Test]
public void RemoveGlobalMapping()
{
NpgsqlConnection.GlobalTypeMapper.RemoveMapping("integer");
using var _ = CreateTempPool(ConnectionString, out var connectionString);
using var conn = OpenConnection(connectionString);
Assert.That(() => conn.ExecuteScalar("SELECT 8"), Throws.TypeOf<NotSupportedException>());
}
[Test]
public void RemoveLocalMapping()
{
using var _ = CreateTempPool(ConnectionString, out var connectionString);
using (var conn = OpenConnection(connectionString))
{
conn.TypeMapper.RemoveMapping("integer");
Assert.That(() => conn.ExecuteScalar("SELECT 8"), Throws.TypeOf<NotSupportedException>());
}
// Make sure reopening (same physical connection) reverts the mapping
using (var conn = OpenConnection(connectionString))
Assert.That(conn.ExecuteScalar("SELECT 8"), Is.EqualTo(8));
}
[Test]
public void GlobalReset()
{
var myFactory = MapMyIntGlobally();
using var _ = CreateTempPool(ConnectionString, out var connectionString);
using (OpenConnection(connectionString)) {}
// We now have a connector in the pool with our custom mapping
NpgsqlConnection.GlobalTypeMapper.Reset();
using (var conn = OpenConnection(connectionString))
{
// Should be the pooled connector from before, but it should have picked up the reset
conn.ExecuteScalar("SELECT 1");
Assert.That(myFactory.Reads, Is.Zero);
// Now create a second *physical* connection to make sure it picks up the new mapping as well
using (var conn2 = OpenConnection(connectionString))
{
conn2.ExecuteScalar("SELECT 1");
Assert.That(myFactory.Reads, Is.Zero);
}
NpgsqlConnection.ClearPool(conn);
}
}
[Test]
public void DomainMappingNotSupported()
{
// PostgreSQL sends RowDescription with the OID of the base type, not the domain,
// it's not possible to map domains
using (CreateTempPool(ConnectionString, out var connectionString))
using (var conn = OpenConnection(connectionString))
{
conn.ExecuteNonQuery(@"CREATE DOMAIN pg_temp.us_postal_code AS TEXT
CHECK
(
VALUE ~ '^\d{5}$'
OR VALUE ~ '^\d{5}-\d{4}$'
);
");
conn.ReloadTypes();
Assert.That(() => conn.TypeMapper.AddMapping(new NpgsqlTypeMappingBuilder
{
PgTypeName = "us_postal_code",
TypeHandlerFactory = new DummyTypeHandlerFactory()
}.Build()), Throws.TypeOf<NotSupportedException>());
}
}
class DummyTypeHandlerFactory : NpgsqlTypeHandlerFactory<int>
{
public override NpgsqlTypeHandler<int> Create(PostgresType postgresType, NpgsqlConnection conn)
=> throw new Exception();
}
[Test]
public void MandatoryMappingFields()
{
Assert.That(() => new NpgsqlTypeMappingBuilder().Build(), Throws.ArgumentException);
Assert.That(() => new NpgsqlTypeMappingBuilder{ PgTypeName = "foo" }.Build(), Throws.ArgumentException);
}
[Test]
public async Task StringToCitext()
{
using (CreateTempPool(ConnectionString, out var connectionString))
using (var conn = OpenConnection(connectionString))
{
await EnsureExtensionAsync(conn, "citext");
conn.TypeMapper.RemoveMapping("text");
conn.TypeMapper.AddMapping(new NpgsqlTypeMappingBuilder
{
PgTypeName = "citext",
NpgsqlDbType = NpgsqlDbType.Citext,
DbTypes = new[] { DbType.String },
ClrTypes = new[] { typeof(string) },
TypeHandlerFactory = new TextHandlerFactory()
}.Build());
using (var cmd = new NpgsqlCommand("SELECT @p = 'hello'::citext", conn))
{
cmd.Parameters.AddWithValue("p", "HeLLo");
Assert.That(cmd.ExecuteScalar(), Is.True);
}
}
}
#region Support
MyInt32HandlerFactory MapMyIntGlobally()
{
var myFactory = new MyInt32HandlerFactory();
NpgsqlConnection.GlobalTypeMapper.AddMapping(new NpgsqlTypeMappingBuilder
{
PgTypeName = "integer",
NpgsqlDbType = NpgsqlDbType.Integer,
DbTypes = new[] { DbType.Int32 },
ClrTypes = new[] { typeof(int) },
TypeHandlerFactory = myFactory
}.Build());
return myFactory;
}
MyInt32HandlerFactory MapMyIntLocally(NpgsqlConnection conn)
{
var myFactory = new MyInt32HandlerFactory();
conn.TypeMapper.AddMapping(new NpgsqlTypeMappingBuilder
{
PgTypeName = "integer",
NpgsqlDbType = NpgsqlDbType.Integer,
DbTypes = new[] { DbType.Int32 },
ClrTypes = new[] { typeof(int) },
TypeHandlerFactory = myFactory
}.Build());
return myFactory;
}
class MyInt32HandlerFactory : NpgsqlTypeHandlerFactory<int>
{
internal int Reads, Writes;
public override NpgsqlTypeHandler<int> Create(PostgresType postgresType, NpgsqlConnection conn)
=> new MyInt32Handler(postgresType, this);
}
class MyInt32Handler : Int32Handler
{
readonly MyInt32HandlerFactory _factory;
public MyInt32Handler(PostgresType postgresType, MyInt32HandlerFactory factory)
: base(postgresType)
{
_factory = factory;
}
public override int Read(NpgsqlReadBuffer buf, int len, FieldDescription? fieldDescription = null)
{
_factory.Reads++;
return base.Read(buf, len, fieldDescription);
}
public override void Write(int value, NpgsqlWriteBuffer buf, NpgsqlParameter? parameter)
{
_factory.Writes++;
base.Write(value, buf, parameter);
}
}
#endregion Support
[TearDown]
public void TearDown() => NpgsqlConnection.GlobalTypeMapper.Reset();
}
}