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QueryMessage.cs
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49 lines (40 loc) · 1.32 KB
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using System.Diagnostics;
using System.Text;
using System.Threading.Tasks;
namespace Npgsql.FrontendMessages
{
/// <summary>
/// A simple query message.
/// </summary>
class QueryMessage : FrontendMessage
{
readonly Encoding _encoding;
string _query;
const byte Code = (byte)'Q';
internal QueryMessage(Encoding encoding)
{
_encoding = encoding;
}
internal QueryMessage Populate(string query)
{
Debug.Assert(query != null);
_query = query;
return this;
}
internal override async Task Write(NpgsqlWriteBuffer buf, bool async)
{
if (buf.WriteSpaceLeft < 1 + 4)
await buf.Flush(async);
var queryByteLen = _encoding.GetByteCount(_query);
buf.WriteByte(Code);
buf.WriteInt32(4 + // Message length (including self excluding code)
queryByteLen + // Query byte length
1); // Null terminator
await buf.WriteString(_query, queryByteLen, async);
if (buf.WriteSpaceLeft < 1)
await buf.Flush(async);
buf.WriteByte(0);
}
public override string ToString() => $"[Query={_query}]";
}
}