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Overview
| Comment: | Update the recipe for resetting a database using SQLITE_DBCONFIG_RESET_DATABASE. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: | c43dd23fb00f7e0b6274de435d8e31f6 |
| User & Date: | dan 2018-07-05 20:33:06 |
Context
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2018-07-05
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| 21:22 | Use separate opcodes, OP_AggValue and OP_AggInverse, for the new callbacks associated with Window Functions, for improved readability of EXPLAIN output. check-in: fa653805 user: drh tags: trunk | |
| 20:33 | Update the recipe for resetting a database using SQLITE_DBCONFIG_RESET_DATABASE. check-in: c43dd23f user: dan tags: trunk | |
| 20:05 | Get the json_group_array() and json_group_object() SQL functions working as window functions. check-in: 916cdc83 user: drh tags: trunk | |
Changes
Changes to src/sqlite.h.in.
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** ** <dt>SQLITE_DBCONFIG_RESET_DATABASE</dt> ** <dd> Set the SQLITE_DBCONFIG_RESET_DATABASE flag and then run ** [VACUUM] in order to reset a database back to an empty database ** with no schema and no content. The following process works even for ** a badly corrupted database file: ** <ol> ** <li> sqlite3_db_config(db, SQLITE_DBCONFIG_RESET_DATABASE, 1, 0); ** <li> [sqlite3_exec](db, "[VACUUM]", 0, 0, 0); ** <li> sqlite3_db_config(db, SQLITE_DBCONFIG_RESET_DATABASE, 0, 0); ** </ol> ** Because resetting a database is destructive and irreversible, the ** process requires the use of this obscure API and multiple steps to help ** ensure that it does not happen by accident. |
> > > > > > |
2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 |
** ** <dt>SQLITE_DBCONFIG_RESET_DATABASE</dt> ** <dd> Set the SQLITE_DBCONFIG_RESET_DATABASE flag and then run ** [VACUUM] in order to reset a database back to an empty database ** with no schema and no content. The following process works even for ** a badly corrupted database file: ** <ol> ** <li> If the database connection is newly opened, make sure it has read the ** database schema by preparing then discarding some query against the ** database, or calling sqlite3_table_column_metadata(), ignoring any ** errors. This step is only necessary if the application desires to keep ** the database in WAL mode after the reset if it was in WAL mode before ** the reset. ** <li> sqlite3_db_config(db, SQLITE_DBCONFIG_RESET_DATABASE, 1, 0); ** <li> [sqlite3_exec](db, "[VACUUM]", 0, 0, 0); ** <li> sqlite3_db_config(db, SQLITE_DBCONFIG_RESET_DATABASE, 0, 0); ** </ol> ** Because resetting a database is destructive and irreversible, the ** process requires the use of this obscure API and multiple steps to help ** ensure that it does not happen by accident. |
Changes to test/resetdb.test.
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PRAGMA page_size;
PRAGMA journal_mode;
PRAGMA quick_check;
} db2
} {0 {1 8192 wal ok}}
db2 close
finish_test
|
> > | > > > > > > > > > > > > > > > > > > > > |
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PRAGMA page_size;
PRAGMA journal_mode;
PRAGMA quick_check;
} db2
} {0 {1 8192 wal ok}}
db2 close
# Reset the database yet again. This time immediately after it is closed
# and reopened. So that the VACUUM is the first statement run.
#
db close
sqlite3 db test.db
do_test 500 {
sqlite3_finalize [
sqlite3_prepare db "SELECT 1 FROM sqlite_master LIMIT 1" -1 tail
]
sqlite3_db_config db RESET_DB 1
db eval VACUUM
sqlite3_db_config db RESET_DB 0
sqlite3 db2 test.db
catchsql {
PRAGMA page_count;
PRAGMA page_size;
PRAGMA journal_mode;
PRAGMA quick_check;
} db2
} {0 {1 8192 wal ok}}
db2 close
finish_test
|