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Overview
| Comment: | Add a couple of details to fts5.in. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
23989471bd8f3f7977e146cd0b5dc269 |
| User & Date: | dan 2015-03-05 21:00:19 |
Context
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2015-03-06
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| 19:29 | Further enhancements to fts5.in. (check-in: 984c3483df user: dan tags: trunk) | |
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2015-03-05
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| 21:00 | Add a couple of details to fts5.in. (check-in: 23989471bd user: dan tags: trunk) | |
| 15:35 | Fix the documentation of PRAGMA index_info to omit the three extra files that were reverted. Improve the documentation of PRAGMA index_list to detail the output fields. (check-in: 8b3cf7e669 user: drh tags: trunk) | |
Changes
Changes to pages/fts5.in.
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INSERT INTO ft(ft, rowid, a, b, c) VALUES('delete', 14, $a, $b, $c);
</codeblock>
<p> If the values "inserted" into the text columns as part of a 'delete'
command are not the same as those currently stored within the table, the
results may be unpredictable.
<p><i style=color:red>todo: explain why</i>
<h2 tags="FTS5 delete-all command">The 'delete-all' Command</h2>
<p> This command is only available with [FTS5 external content tables |
external content] and [FTS5 contentless tables | contentless] tables. It
deletes all entries from the full-text index.
................................................................................
<ul>
<li> Adding new auxiliary functions implemented in C, and
<li> Adding new tokenizers, also implemented in C.
</ul>
<p> The built-in tokenizers and auxiliary functions described in this
documented are all implemented using the publicly available API described
below.
<p> Before a new auxiliary function or tokenizer implementation may be
registered with FTS5, an application must obtain a pointer to the "fts5_api"
structure. There is one fts5_api structure for each database connection with
which the FTS5 extension is registered. To obtain the pointer, the application
invokes the SQL user-defined function fts5(), which returns a blob value
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INSERT INTO ft(ft, rowid, a, b, c) VALUES('delete', 14, $a, $b, $c);
</codeblock>
<p> If the values "inserted" into the text columns as part of a 'delete'
command are not the same as those currently stored within the table, the
results may be unpredictable.
<p> The reason for this is easy to understand: When a document is inserted
into the FTS5 table, an entry is added to the full-text index to record the
position of each token within the new document. When a document is removed,
the original data is required in order to determine the set of entries that
need to be removed from the full-text index. So if the data supplied to FTS5
when a row is deleted using this command is different from that used to
determine the set of token instances when it was inserted, some full-text
index entries may not be correctly deleted, or FTS5 may try to remove index
entries that do not exist. This can leave the full-text index in an
unpredictable state, making future query results unreliable.
<h2 tags="FTS5 delete-all command">The 'delete-all' Command</h2>
<p> This command is only available with [FTS5 external content tables |
external content] and [FTS5 contentless tables | contentless] tables. It
deletes all entries from the full-text index.
................................................................................
<ul>
<li> Adding new auxiliary functions implemented in C, and
<li> Adding new tokenizers, also implemented in C.
</ul>
<p> The built-in tokenizers and auxiliary functions described in this
document are all implemented using the publicly available API described
below.
<p> Before a new auxiliary function or tokenizer implementation may be
registered with FTS5, an application must obtain a pointer to the "fts5_api"
structure. There is one fts5_api structure for each database connection with
which the FTS5 extension is registered. To obtain the pointer, the application
invokes the SQL user-defined function fts5(), which returns a blob value
|