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PregeneratedMessages.cs
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52 lines (42 loc) · 2.04 KB
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using System.IO;
using System.Text;
using Npgsql.Internal;
using Npgsql.Util;
namespace Npgsql;
static class PregeneratedMessages
{
static PregeneratedMessages()
{
// This is the only use of a write buffer without a connector, for in-memory construction of
// pregenerated messages.
using var buf = new NpgsqlWriteBuffer(null, new MemoryStream(), null, NpgsqlWriteBuffer.MinimumSize, Encoding.ASCII);
BeginTransRepeatableRead = Generate(buf, "BEGIN ISOLATION LEVEL REPEATABLE READ");
BeginTransSerializable = Generate(buf, "BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE");
BeginTransReadCommitted = Generate(buf, "BEGIN TRANSACTION ISOLATION LEVEL READ COMMITTED");
BeginTransReadUncommitted = Generate(buf, "BEGIN TRANSACTION ISOLATION LEVEL READ UNCOMMITTED");
CommitTransaction = Generate(buf, "COMMIT");
RollbackTransaction = Generate(buf, "ROLLBACK");
DiscardAll = Generate(buf, "DISCARD ALL");
}
internal static byte[] Generate(NpgsqlWriteBuffer buf, string query)
{
NpgsqlWriteBuffer.AssertASCIIOnly(query);
var queryByteLen = buf.TextEncoding.GetByteCount(query);
buf.WriteByte(FrontendMessageCode.Query);
buf.WriteInt32(4 + // Message length (including self excluding code)
queryByteLen + // Query byte length
1); // Null terminator
buf.WriteString(query, queryByteLen, false).Wait();
buf.WriteByte(0);
var bytes = buf.GetContents();
buf.Clear();
return bytes;
}
internal static readonly byte[] BeginTransRepeatableRead;
internal static readonly byte[] BeginTransSerializable;
internal static readonly byte[] BeginTransReadCommitted;
internal static readonly byte[] BeginTransReadUncommitted;
internal static readonly byte[] CommitTransaction;
internal static readonly byte[] RollbackTransaction;
internal static readonly byte[] DiscardAll;
}