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Overview
Comment:Fix an error in the FTS matchinfo documentation.
Timelines: family | ancestors | descendants | both | trunk
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SHA1: 4a7f0dacc7e3598943d4470f081110b437de23a0
User & Date: dan 2012-02-05 05:19:56
Context
2012-02-23
12:32
Fix a typo in the lang_keywords.html page. check-in: f8a77cd24f user: drh tags: trunk
2012-02-05
05:19
Fix an error in the FTS matchinfo documentation. check-in: 4a7f0dacc7 user: dan tags: trunk
2012-01-28
19:47
Update the changelog to mention IF NOT EXISTS on virtual tables. check-in: b0db418b5a user: drh tags: trunk
Changes
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Changes to pages/fts3.in.

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  <i>--</i>
  <i>-- The next set of three integers (0 1 1) pertain to the hits for "default"</i>
  <i>-- in column 1 of the table (0 in this row, 1 in all rows, spread across </i>
  <i>-- 1 rows).</i>
  <i>--</i>
  SELECT matchinfo(t1) FROM t1 WHERE t1 MATCH 'default transaction "these semantics"';

  <i>-- The format string for this query is "nl". The output array will therefore</i>
  <i>-- contain 3 integer values - 1 for "n" and 2 for "l". The query returns</i>
  <i>-- two rows (the first two rows in the table match). The values returned are:</i>
  <i>--</i>
  <i>--     3  1 1</i>
  <i>--     3  2 0</i>
  <i>--</i>
  <i>-- The first value in the matchinfo array returned for both rows is 3 (the </i>
  <i>-- number of rows in the table). The following two values are the lengths </i>
  <i>-- of the longest common subsequence of phrase matches in each column.</i>
  SELECT matchinfo(t1, 'nl') FROM t1 WHERE t1 MATCH 'default transaction';
</codeblock>

<p>
  The matchinfo function is much faster than either the snippet or offsets
  functions. This is because the implementation of both snippet and offsets
  is required to retrieve the documents being analyzed from disk, whereas
  all data required by matchinfo is available as part of the same portions







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  <i>--</i>
  <i>-- The next set of three integers (0 1 1) pertain to the hits for "default"</i>
  <i>-- in column 1 of the table (0 in this row, 1 in all rows, spread across </i>
  <i>-- 1 rows).</i>
  <i>--</i>
  SELECT matchinfo(t1) FROM t1 WHERE t1 MATCH 'default transaction "these semantics"';

  <i>-- The format string for this query is "ns". The output array will therefore</i>
  <i>-- contain 3 integer values - 1 for "n" and 2 for "s". The query returns</i>
  <i>-- two rows (the first two rows in the table match). The values returned are:</i>
  <i>--</i>
  <i>--     3  1 1</i>
  <i>--     3  2 0</i>
  <i>--</i>
  <i>-- The first value in the matchinfo array returned for both rows is 3 (the </i>
  <i>-- number of rows in the table). The following two values are the lengths </i>
  <i>-- of the longest common subsequence of phrase matches in each column.</i>
  SELECT matchinfo(t1, 'ns') FROM t1 WHERE t1 MATCH 'default transaction';
</codeblock>

<p>
  The matchinfo function is much faster than either the snippet or offsets
  functions. This is because the implementation of both snippet and offsets
  is required to retrieve the documents being analyzed from disk, whereas
  all data required by matchinfo is available as part of the same portions