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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

Artifact 7fda92e443233208ec5e1825b176a9df63fb5bf962248e08b76eb4296c630cdf:


# 2018-04-28
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# Test cases for SQLITE_DBCONFIG_RESET_DATABASE
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix resetdb

ifcapable !vtab||!compound {
  finish_test
  return
}

# Create a sample database
do_execsql_test 100 {
  PRAGMA page_size=4096;
  CREATE TABLE t1(a,b);
  WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<20)
    INSERT INTO t1(a,b) SELECT x, randomblob(300) FROM c;
  CREATE INDEX t1a ON t1(a);
  CREATE INDEX t1b ON t1(b);
  SELECT sum(a), sum(length(b)) FROM t1;
  PRAGMA integrity_check;
  PRAGMA journal_mode;
  PRAGMA page_count;
} {210 6000 ok delete 8}

# Verify that the same content is seen from a separate database connection
sqlite3 db2 test.db
do_test 110 {
  execsql {
    SELECT sum(a), sum(length(b)) FROM t1;
    PRAGMA integrity_check;
    PRAGMA journal_mode;
    PRAGMA page_count;
  } db2
} {210 6000 ok delete 8}

do_test 200 {
  # Thoroughly corrupt the database file by overwriting the first
  # page with randomness.
  catchsql {
    UPDATE sqlite_dbpage SET data=randomblob(4096) WHERE pgno=1;
    PRAGMA quick_check;
  }
} {1 {unsupported file format}}
do_test 201 {
  catchsql {
    PRAGMA quick_check;
  } db2
} {1 {unsupported file format}}

do_test 210 {
  # Reset the database file using SQLITE_DBCONFIG_RESET_DATABASE
  sqlite3_db_config db RESET_DB 1
  db eval VACUUM
  sqlite3_db_config db RESET_DB 0

  # Verify that the reset took, even on the separate database connection
  catchsql {
     PRAGMA page_count;
     PRAGMA page_size;
     PRAGMA quick_check;
     PRAGMA journal_mode;
  } db2
} {0 {1 4096 ok delete}}

# Delete the old connections and database and start over again
# with a different page size and in WAL mode.
#
db close
db2 close
forcedelete test.db
sqlite3 db test.db
do_execsql_test 300 {
  PRAGMA page_size=8192;
  PRAGMA journal_mode=WAL;
  CREATE TABLE t1(a,b);
  WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<20)
    INSERT INTO t1(a,b) SELECT x, randomblob(1300) FROM c;
  CREATE INDEX t1a ON t1(a);
  CREATE INDEX t1b ON t1(b);
  SELECT sum(a), sum(length(b)) FROM t1;
  PRAGMA integrity_check;
  PRAGMA journal_mode;
  PRAGMA page_size;
  PRAGMA page_count;
} {wal 210 26000 ok wal 8192 12}
sqlite3 db2 test.db
do_test 310 {
  execsql {
    SELECT sum(a), sum(length(b)) FROM t1;
    PRAGMA integrity_check;
    PRAGMA journal_mode;
    PRAGMA page_size;
    PRAGMA page_count;
  } db2
} {210 26000 ok wal 8192 12}

# Corrupt the database again
do_catchsql_test 320 {
  UPDATE sqlite_dbpage SET data=randomblob(8192) WHERE pgno=1;
  PRAGMA quick_check
} {1 {file is not a database}}

do_test 330 {
  catchsql {
    PRAGMA quick_check
  } db2
} {1 {file is not a database}}

# Reset the database yet again.  Verify that the page size and
# journal mode are preserved.
#
do_test 400 {
  sqlite3_db_config db RESET_DB 1
  db eval VACUUM
  sqlite3_db_config db RESET_DB 0
  catchsql {
     PRAGMA page_count;
     PRAGMA page_size;
     PRAGMA journal_mode;
     PRAGMA quick_check;
  } db2
} {0 {1 8192 wal ok}}
db2 close


finish_test