Joseph Doherty
40 lines
1.4 KiB
C#
40 lines
1.4 KiB
C#
namespace ZB.MOM.WW.OtOpcUa.Driver.Sql.Contracts;
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/// <summary>Which ADO.NET provider/dialect backs a Sql driver instance. v1 constructs only SqlServer.</summary>
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public enum SqlProvider
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{
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/// <summary>Microsoft SQL Server via <c>Microsoft.Data.SqlClient</c> — the only provider v1 constructs.</summary>
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SqlServer,
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/// <summary>PostgreSQL (Npgsql) — reserved for P2; not constructed in v1.</summary>
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Postgres,
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/// <summary>MySQL / MariaDB — reserved; not constructed in v1.</summary>
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MySql,
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/// <summary>Generic ODBC — reserved for P2; not constructed in v1.</summary>
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Odbc,
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/// <summary>Oracle — reserved; not constructed in v1.</summary>
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Oracle,
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}
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/// <summary>Tag→value mapping model. v1 ships KeyValue + WideRow; Query is deferred (design §5.4 / P3).</summary>
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public enum SqlTagModel
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{
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/// <summary>
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/// Key-value (EAV) table: one row per tag, selected by <c>keyColumn = keyValue</c>, value read from
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/// <c>valueColumn</c>.
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/// </summary>
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KeyValue,
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/// <summary>
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/// Wide row: one row holds many signals as columns; the tag names its <c>columnName</c> and the row is
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/// picked by a row selector (a <c>whereColumn</c>/<c>whereValue</c> pair, or newest-by-timestamp).
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/// </summary>
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WideRow,
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/// <summary>Named arbitrary-SELECT query (design §5.4). <b>Deferred to P3 — not accepted by v1's parser.</b></summary>
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Query,
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}
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