internal DqliteTransaction(DqliteConnection connection, IsolationLevel isolationLevel)
{
if (isolationLevel == IsolationLevel.ReadUncommitted ||
isolationLevel == IsolationLevel.ReadCommitted ||
isolationLevel == IsolationLevel.RepeatableRead)
{
isolationLevel = IsolationLevel.Serializable;
}
_connection = connection;
_isolationLevel = isolationLevel;
if (isolationLevel == IsolationLevel.ReadUncommitted)
{
_connection.Connector.ExecuteNonQuery(_connection.CurrentDatabase, "PRAGMA read_uncommitted = 1;");
}
else if (isolationLevel == IsolationLevel.Serializable)
{
_connection.Connector.ExecuteNonQuery(_connection.CurrentDatabase, "PRAGMA read_uncommitted = 0;");
}
else if (isolationLevel != IsolationLevel.Unspecified)
{
throw new ArgumentException(Resources.InvalidIsolationLevel(isolationLevel));
}
_connection.Connector.ExecuteNonQuery(_connection.CurrentDatabase,
IsolationLevel == IsolationLevel.Serializable
? "BEGIN IMMEDIATE;"
: "BEGIN;");
}
public async Task Test1Async(int rows)
{
var builder = new DqliteConnectionStringBuilder()
{
Nodes = new [] { "127.0.0.1:6543" },
DataSource = "main"
};
using (var connection = new DqliteConnection(builder.ToString()))
{
await connection.OpenAsync();
using (var command = new DqliteCommand()
{
Connection = connection
})
{
command.CommandText = "CREATE TABLE IF NOT EXISTS Sample(n INT);";
await command.ExecuteNonQueryAsync();
command.CommandText = "DELETE FROM Sample;";
await command.ExecuteNonQueryAsync();
command.CommandText = "INSERT INTO Sample(n) VALUES(@value);";
await command.PrepareAsync();
for (int i = 0; i < rows; ++i)
{
command.Parameters.AddWithValue("@value", i);
await command.ExecuteNonQueryAsync();
command.Parameters.Clear();
}
command.CommandText = "SELECT count(0) FROM Sample;";
await using (var reader = await command.ExecuteReaderAsync())
{
Assert.True(await reader.ReadAsync());
Assert.Equal(1, reader.FieldCount);
Assert.Equal(rows, reader.GetInt64(0));
Assert.False(await reader.ReadAsync());
}
command.CommandText = "SELECT n FROM Sample;";
await using (var reader = await command.ExecuteReaderAsync())
{
for (int i = 0; i < rows; ++i)
{
Assert.True(await reader.ReadAsync());
Assert.Equal(i, reader.GetInt64(0));
}
Assert.False(await reader.ReadAsync());
}
}
}
}
public static T ExecuteScalar <T>(
this DqliteConnection connection,
string commandText,
params DqliteParameter[] parameters)
{
using (var command = connection.CreateCommand())
{
command.CommandText = commandText;
command.Parameters.AddRange(parameters);
return((T)command.ExecuteScalar());
}
}
public static int ExecuteNonQuery(
this DqliteConnection connection,
string commandText,
params DqliteParameter[] parameters)
{
using (var command = connection.CreateCommand())
{
command.CommandText = commandText;
command.Parameters.AddRange(parameters);
return(command.ExecuteNonQuery());
}
}
public static T ExecuteScalar <T>(
this DqliteConnection connection,
string commandText,
params DqliteParameter[] parameters) where T : IConvertible
{
using (var command = connection.CreateCommand())
{
command.CommandText = commandText;
command.Parameters.AddRange(parameters);
return((T)Convert.ChangeType(command.ExecuteScalar(), typeof(T)));
}
}
public static async Task <T> ExecuteScalarAsync <T>(
this DqliteConnection connection,
string commandText,
DqliteParameter[] parameters,
CancellationToken cancellationToken = default(CancellationToken))
{
using (var command = connection.CreateCommand())
{
command.CommandText = commandText;
command.Parameters.AddRange(parameters);
return((T)await command.ExecuteScalarAsync());
}
}
public DqliteCommand(string commandText, DqliteConnection connection, DqliteTransaction transaction)
: this(commandText, connection)
{
this.Transaction = transaction;
}
public DqliteCommand(string commandText, DqliteConnection connection)
: this(commandText)
{
this.Connection = connection;
this.CommandTimeout = connection.DefaultTimeout;
}
private void Complete()
{
_connection.Transaction = null;
_connection = null;
_completed = true;
}
public static Task <int> ExecuteNonQueryAsync(
this DqliteConnection connection,
string commandText,
params DqliteParameter[] parameters)
=> ExecuteNonQueryAsync(connection, commandText, parameters, CancellationToken.None);
public static Task <T> ExecuteScalarAsync <T>(
this DqliteConnection connection,
string commandText,
params DqliteParameter[] parameters)
=> ExecuteScalarAsync <T>(connection, commandText, parameters, CancellationToken.None);
