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Overview
| Comment: | Updates to the sqlite3_vtab_nochange() documentation. No changes to code. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
5bd99abc10b8153aadff5f815ae15fbe |
| User & Date: | drh 2018-05-24 13:59:45 |
Context
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2018-05-24
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| 16:18 | Addition cases for rtree preformance testing in speedtest1.c. Add the --nodiff option to the speed-check.sh script. check-in: 95f2d62c user: drh tags: trunk | |
| 13:59 | Updates to the sqlite3_vtab_nochange() documentation. No changes to code. check-in: 5bd99abc user: drh tags: trunk | |
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2018-05-23
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| 17:53 | Remove a branch that is no longer used due to the fix to the sqlite_sequence schema problem, ticket [d8dc2b3a58cd5dc2918a1d4acbba4676a23ada4c] check-in: 06674269 user: drh tags: trunk | |
Changes
Changes to src/sqlite.h.in.
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/* ** CAPI3REF: Determine If Virtual Table Column Access Is For UPDATE ** ** If the sqlite3_vtab_nochange(X) routine is called within the [xColumn] ** method of a [virtual table], then it returns true if and only if the ** column is being fetched as part of an UPDATE operation during which the ** column value will not change. Applications might use this to substitute ** a lighter-weight value to return that the corresponding [xUpdate] method ** understands as a "no-change" value. ** ** If the [xColumn] method calls sqlite3_vtab_nochange() and finds that ** the column is not changed by the UPDATE statement, they the xColumn ** method can optionally return without setting a result, without calling ** any of the [sqlite3_result_int|sqlite3_result_xxxxx() interfaces]. ** In that case, [sqlite3_value_nochange(X)] will return true for the ** same column in the [xUpdate] method. */ int sqlite3_vtab_nochange(sqlite3_context*); |
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/* ** CAPI3REF: Determine If Virtual Table Column Access Is For UPDATE ** ** If the sqlite3_vtab_nochange(X) routine is called within the [xColumn] ** method of a [virtual table], then it returns true if and only if the ** column is being fetched as part of an UPDATE operation during which the ** column value will not change. Applications might use this to substitute ** a return value that is less expensive to compute and that the corresponding ** [xUpdate] method understands as a "no-change" value. ** ** If the [xColumn] method calls sqlite3_vtab_nochange() and finds that ** the column is not changed by the UPDATE statement, then the xColumn ** method can optionally return without setting a result, without calling ** any of the [sqlite3_result_int|sqlite3_result_xxxxx() interfaces]. ** In that case, [sqlite3_value_nochange(X)] will return true for the ** same column in the [xUpdate] method. */ int sqlite3_vtab_nochange(sqlite3_context*); |