693 lines
21 KiB
Plaintext
693 lines
21 KiB
Plaintext
# 2005 November 30
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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#
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# This file contains tests to ensure that the library handles malloc() failures
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# correctly. The emphasis of these tests are the _prepare(), _step() and
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# _finalize() calls.
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#
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# $Id: malloc3.test,v 1.24 2008/10/14 15:54:08 drh Exp $
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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source $testdir/malloc_common.tcl
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# Only run these tests if memory debugging is turned on.
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#
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if {!$MEMDEBUG} {
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puts "Skipping malloc3 tests: not compiled with -DSQLITE_MEMDEBUG..."
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finish_test
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return
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}
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# Do not run these tests with an in-memory journal.
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#
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# In the pager layer, if an IO or OOM error occurs during a ROLLBACK, or
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# when flushing a page to disk due to cache-stress, the pager enters an
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# "error state". The only way out of the error state is to unlock the
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# database file and end the transaction, leaving whatever journal and
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# database files happen to be on disk in place. The next time the current
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# (or any other) connection opens a read transaction, hot-journal rollback
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# is performed if necessary.
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#
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# Of course, this doesn't work with an in-memory journal.
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#
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if {[permutation]=="inmemory_journal"} {
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finish_test
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return
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}
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#--------------------------------------------------------------------------
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# NOTES ON RECOVERING FROM A MALLOC FAILURE
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#
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# The tests in this file test the behaviours described in the following
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# paragraphs. These tests test the behaviour of the system when malloc() fails
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# inside of a call to _prepare(), _step(), _finalize() or _reset(). The
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# handling of malloc() failures within ancillary procedures is tested
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# elsewhere.
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#
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# Overview:
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#
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# Executing a statement is done in three stages (prepare, step and finalize). A
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# malloc() failure may occur within any stage. If a memory allocation fails
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# during statement preparation, no statement handle is returned. From the users
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# point of view the system state is as if _prepare() had never been called.
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#
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# If the memory allocation fails during the _step() or _finalize() calls, then
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# the database may be left in one of two states (after finalize() has been
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# called):
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#
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# * As if the neither _step() nor _finalize() had ever been called on
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# the statement handle (i.e. any changes made by the statement are
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# rolled back).
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# * The current transaction may be rolled back. In this case a hot-journal
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# may or may not actually be present in the filesystem.
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#
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# The caller can tell the difference between these two scenarios by invoking
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# _get_autocommit().
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#
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#
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# Handling of sqlite3_reset():
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#
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# If a malloc() fails while executing an sqlite3_reset() call, this is handled
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# in the same way as a failure within _finalize(). The statement handle
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# is not deleted and must be passed to _finalize() for resource deallocation.
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# Attempting to _step() or _reset() the statement after a failed _reset() will
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# always return SQLITE_NOMEM.
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#
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#
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# Other active SQL statements:
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#
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# The effect of a malloc failure on concurrently executing SQL statements,
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# particularly when the statement is executing with READ_UNCOMMITTED set and
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# the malloc() failure mandates statement rollback only. Currently, if
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# transaction rollback is required, all other vdbe's are aborted.
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#
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# Non-transient mallocs in btree.c:
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# * The Btree structure itself
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# * Each BtCursor structure
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#
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# Mallocs in pager.c:
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# readMasterJournal() - Space to read the master journal name
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# pager_delmaster() - Space for the entire master journal file
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#
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# sqlite3pager_open() - The pager structure itself
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# sqlite3_pagerget() - Space for a new page
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# pager_open_journal() - Pager.aInJournal[] bitmap
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# sqlite3pager_write() - For in-memory databases only: history page and
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# statement history page.
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# pager_stmt_begin() - Pager.aInStmt[] bitmap
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#
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# None of the above are a huge problem. The most troublesome failures are the
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# transient malloc() calls in btree.c, which can occur during the tree-balance
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# operation. This means the tree being balanced will be internally inconsistent
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# after the malloc() fails. To avoid the corrupt tree being read by a
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# READ_UNCOMMITTED query, we have to make sure the transaction or statement
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# rollback occurs before sqlite3_step() returns, not during a subsequent
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# sqlite3_finalize().
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#--------------------------------------------------------------------------
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#--------------------------------------------------------------------------
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# NOTES ON TEST IMPLEMENTATION
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#
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# The tests in this file are implemented differently from those in other
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# files. Instead, tests are specified using three primitives: SQL, PREP and
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# TEST. Each primitive has a single argument. Primitives are processed in
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# the order they are specified in the file.
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#
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# A TEST primitive specifies a TCL script as its argument. When a TEST
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# directive is encountered the Tcl script is evaluated. Usually, this Tcl
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# script contains one or more calls to [do_test].
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#
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# A PREP primitive specifies an SQL script as its argument. When a PREP
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# directive is encountered the SQL is evaluated using database connection
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# [db].
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#
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# The SQL primitives are where the action happens. An SQL primitive must
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# contain a single, valid SQL statement as its argument. When an SQL
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# primitive is encountered, it is evaluated one or more times to test the
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# behaviour of the system when malloc() fails during preparation or
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# execution of said statement. The Nth time the statement is executed,
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# the Nth malloc is said to fail. The statement is executed until it
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# succeeds, i.e. (M+1) times, where M is the number of mallocs() required
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# to prepare and execute the statement.
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#
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# Each time an SQL statement fails, the driver program (see proc [run_test]
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# below) figures out if a transaction has been automatically rolled back.
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# If not, it executes any TEST block immediately proceeding the SQL
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# statement, then reexecutes the SQL statement with the next value of N.
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#
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# If a transaction has been automatically rolled back, then the driver
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# program executes all the SQL specified as part of SQL or PREP primitives
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# between the current SQL statement and the most recent "BEGIN". Any
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# TEST block immediately proceeding the SQL statement is evaluated, and
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# then the SQL statement reexecuted with the incremented N value.
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#
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# That make any sense? If not, read the code in [run_test] and it might.
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#
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# Extra restriction imposed by the implementation:
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#
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# * If a PREP block starts a transaction, it must finish it.
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# * A PREP block may not close a transaction it did not start.
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#
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#--------------------------------------------------------------------------
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# These procs are used to build up a "program" in global variable
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# ::run_test_script. At the end of this file, the proc [run_test] is used
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# to execute the program (and all test cases contained therein).
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#
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set ::run_test_sql_id 0
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set ::run_test_script [list]
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proc TEST {id t} {lappend ::run_test_script -test [list $id $t]}
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proc PREP {p} {lappend ::run_test_script -prep [string trim $p]}
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proc DEBUG {s} {lappend ::run_test_script -debug $s}
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# SQL --
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#
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# SQL ?-norollback? <sql-text>
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#
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# Add an 'SQL' primitive to the program (see notes above). If the -norollback
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# switch is present, then the statement is not allowed to automatically roll
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# back any active transaction if malloc() fails. It must rollback the statement
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# transaction only.
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#
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proc SQL {a1 {a2 ""}} {
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# An SQL primitive parameter is a list of three elements, an id, a boolean
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# value indicating if the statement may cause transaction rollback when
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# malloc() fails, and the sql statement itself.
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set id [incr ::run_test_sql_id]
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if {$a2 == ""} {
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lappend ::run_test_script -sql [list $id true [string trim $a1]]
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} else {
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lappend ::run_test_script -sql [list $id false [string trim $a2]]
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}
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}
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# TEST_AUTOCOMMIT --
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#
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# A shorthand test to see if a transaction is active or not. The first
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# argument - $id - is the integer number of the test case. The second
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# argument is either 1 or 0, the expected value of the auto-commit flag.
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#
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proc TEST_AUTOCOMMIT {id a} {
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TEST $id "do_test \$testid { sqlite3_get_autocommit \$::DB } {$a}"
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}
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#--------------------------------------------------------------------------
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# Start of test program declaration
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#
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# Warm body test. A malloc() fails in the middle of a CREATE TABLE statement
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# in a single-statement transaction on an empty database. Not too much can go
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# wrong here.
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#
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TEST 1 {
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do_test $testid {
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execsql {SELECT tbl_name FROM sqlite_master;}
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} {}
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}
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SQL {
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CREATE TABLE IF NOT EXISTS abc(a, b, c);
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}
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TEST 2 {
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do_test $testid.1 {
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execsql {SELECT tbl_name FROM sqlite_master;}
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} {abc}
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}
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# Insert a couple of rows into the table. each insert is in its own
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# transaction. test that the table is unpopulated before running the inserts
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# (and hence after each failure of the first insert), and that it has been
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# populated correctly after the final insert succeeds.
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#
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TEST 3 {
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do_test $testid.2 {
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execsql {SELECT * FROM abc}
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} {}
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}
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SQL {INSERT INTO abc VALUES(1, 2, 3);}
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SQL {INSERT INTO abc VALUES(4, 5, 6);}
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SQL {INSERT INTO abc VALUES(7, 8, 9);}
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TEST 4 {
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do_test $testid {
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execsql {SELECT * FROM abc}
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} {1 2 3 4 5 6 7 8 9}
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}
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# Test a CREATE INDEX statement. Because the table 'abc' is so small, the index
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# will all fit on a single page, so this doesn't test too much that the CREATE
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# TABLE statement didn't test. A few of the transient malloc()s in btree.c
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# perhaps.
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#
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SQL {CREATE INDEX abc_i ON abc(a, b, c);}
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TEST 4 {
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do_test $testid {
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execsql {
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SELECT * FROM abc ORDER BY a DESC;
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}
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} {7 8 9 4 5 6 1 2 3}
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}
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# Test a DELETE statement. Also create a trigger and a view, just to make sure
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# these statements don't have any obvious malloc() related bugs in them. Note
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# that the test above will be executed each time the DELETE fails, so we're
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# also testing rollback of a DELETE from a table with an index on it.
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#
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SQL {DELETE FROM abc WHERE a > 2;}
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SQL {CREATE TRIGGER abc_t AFTER INSERT ON abc BEGIN SELECT 'trigger!'; END;}
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SQL {CREATE VIEW abc_v AS SELECT * FROM abc;}
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TEST 5 {
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do_test $testid {
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execsql {
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SELECT name, tbl_name FROM sqlite_master ORDER BY name;
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SELECT * FROM abc;
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}
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} {abc abc abc_i abc abc_t abc abc_v abc_v 1 2 3}
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}
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set sql {
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BEGIN;DELETE FROM abc;
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}
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for {set i 1} {$i < 100} {incr i} {
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set a $i
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set b "String value $i"
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set c [string repeat X $i]
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append sql "INSERT INTO abc VALUES ($a, '$b', '$c');"
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}
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append sql {COMMIT;}
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PREP $sql
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SQL {
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DELETE FROM abc WHERE oid IN (SELECT oid FROM abc ORDER BY random() LIMIT 5);
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}
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TEST 6 {
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do_test $testid.1 {
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execsql {SELECT count(*) FROM abc}
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} {94}
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do_test $testid.2 {
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execsql {
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SELECT min(
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(oid == a) AND 'String value ' || a == b AND a == length(c)
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) FROM abc;
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}
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} {1}
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}
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SQL {
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DELETE FROM abc WHERE oid IN (SELECT oid FROM abc ORDER BY random() LIMIT 5);
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}
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TEST 7 {
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do_test $testid {
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execsql {SELECT count(*) FROM abc}
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} {89}
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do_test $testid {
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execsql {
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SELECT min(
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(oid == a) AND 'String value ' || a == b AND a == length(c)
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) FROM abc;
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}
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} {1}
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}
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SQL {
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DELETE FROM abc WHERE oid IN (SELECT oid FROM abc ORDER BY random() LIMIT 5);
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}
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TEST 9 {
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do_test $testid {
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execsql {SELECT count(*) FROM abc}
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} {84}
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do_test $testid {
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execsql {
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SELECT min(
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(oid == a) AND 'String value ' || a == b AND a == length(c)
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) FROM abc;
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}
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} {1}
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}
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set padding [string repeat X 500]
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PREP [subst {
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DROP TABLE abc;
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CREATE TABLE abc(a PRIMARY KEY, padding, b, c);
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INSERT INTO abc VALUES(0, '$padding', 2, 2);
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INSERT INTO abc VALUES(3, '$padding', 5, 5);
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INSERT INTO abc VALUES(6, '$padding', 8, 8);
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}]
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TEST 10 {
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do_test $testid {
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execsql {SELECT a, b, c FROM abc}
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} {0 2 2 3 5 5 6 8 8}
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}
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SQL {BEGIN;}
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SQL {INSERT INTO abc VALUES(9, 'XXXXX', 11, 12);}
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TEST_AUTOCOMMIT 11 0
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SQL -norollback {UPDATE abc SET a = a + 1, c = c + 1;}
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TEST_AUTOCOMMIT 12 0
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SQL {DELETE FROM abc WHERE a = 10;}
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TEST_AUTOCOMMIT 13 0
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SQL {COMMIT;}
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TEST 14 {
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do_test $testid.1 {
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sqlite3_get_autocommit $::DB
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} {1}
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do_test $testid.2 {
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execsql {SELECT a, b, c FROM abc}
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} {1 2 3 4 5 6 7 8 9}
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}
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PREP [subst {
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DROP TABLE abc;
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CREATE TABLE abc(a, padding, b, c);
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INSERT INTO abc VALUES(1, '$padding', 2, 3);
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INSERT INTO abc VALUES(4, '$padding', 5, 6);
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INSERT INTO abc VALUES(7, '$padding', 8, 9);
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CREATE INDEX abc_i ON abc(a, padding, b, c);
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}]
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TEST 15 {
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db eval {PRAGMA cache_size = 10}
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}
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SQL {BEGIN;}
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SQL -norllbck {INSERT INTO abc (oid, a, padding, b, c) SELECT NULL, * FROM abc}
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TEST 16 {
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do_test $testid {
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execsql {SELECT a, count(*) FROM abc GROUP BY a;}
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} {1 2 4 2 7 2}
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}
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SQL -norllbck {INSERT INTO abc (oid, a, padding, b, c) SELECT NULL, * FROM abc}
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TEST 17 {
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do_test $testid {
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execsql {SELECT a, count(*) FROM abc GROUP BY a;}
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} {1 4 4 4 7 4}
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}
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SQL -norllbck {INSERT INTO abc (oid, a, padding, b, c) SELECT NULL, * FROM abc}
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TEST 18 {
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do_test $testid {
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execsql {SELECT a, count(*) FROM abc GROUP BY a;}
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} {1 8 4 8 7 8}
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}
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SQL -norllbck {INSERT INTO abc (oid, a, padding, b, c) SELECT NULL, * FROM abc}
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TEST 19 {
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do_test $testid {
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execsql {SELECT a, count(*) FROM abc GROUP BY a;}
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} {1 16 4 16 7 16}
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}
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SQL {COMMIT;}
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TEST 21 {
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do_test $testid {
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execsql {SELECT a, count(*) FROM abc GROUP BY a;}
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} {1 16 4 16 7 16}
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}
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SQL {BEGIN;}
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SQL {DELETE FROM abc WHERE oid %2}
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TEST 22 {
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do_test $testid {
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execsql {SELECT a, count(*) FROM abc GROUP BY a;}
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} {1 8 4 8 7 8}
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}
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SQL {DELETE FROM abc}
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TEST 23 {
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do_test $testid {
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execsql {SELECT * FROM abc}
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} {}
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}
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SQL {ROLLBACK;}
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TEST 24 {
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do_test $testid {
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execsql {SELECT a, count(*) FROM abc GROUP BY a;}
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} {1 16 4 16 7 16}
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}
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# Test some schema modifications inside of a transaction. These should all
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# cause transaction rollback if they fail. Also query a view, to cover a bit
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# more code.
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#
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PREP {DROP VIEW abc_v;}
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TEST 25 {
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do_test $testid {
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execsql {
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SELECT name, tbl_name FROM sqlite_master;
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}
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} {abc abc abc_i abc}
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}
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SQL {BEGIN;}
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SQL {CREATE TABLE def(d, e, f);}
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SQL {CREATE TABLE ghi(g, h, i);}
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TEST 26 {
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do_test $testid {
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execsql {
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SELECT name, tbl_name FROM sqlite_master;
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}
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} {abc abc abc_i abc def def ghi ghi}
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}
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SQL {CREATE VIEW v1 AS SELECT * FROM def, ghi}
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SQL {CREATE UNIQUE INDEX ghi_i1 ON ghi(g);}
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TEST 27 {
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do_test $testid {
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execsql {
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SELECT name, tbl_name FROM sqlite_master;
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}
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} {abc abc abc_i abc def def ghi ghi v1 v1 ghi_i1 ghi}
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}
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SQL {INSERT INTO def VALUES('a', 'b', 'c')}
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SQL {INSERT INTO def VALUES(1, 2, 3)}
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SQL -norollback {INSERT INTO ghi SELECT * FROM def}
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TEST 28 {
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do_test $testid {
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execsql {
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SELECT * FROM def, ghi WHERE d = g;
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}
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} {a b c a b c 1 2 3 1 2 3}
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}
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SQL {COMMIT}
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TEST 29 {
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do_test $testid {
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execsql {
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SELECT * FROM v1 WHERE d = g;
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}
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} {a b c a b c 1 2 3 1 2 3}
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}
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# Test a simple multi-file transaction
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#
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forcedelete test2.db
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ifcapable attach {
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SQL {ATTACH 'test2.db' AS aux;}
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SQL {BEGIN}
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SQL {CREATE TABLE aux.tbl2(x, y, z)}
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SQL {INSERT INTO tbl2 VALUES(1, 2, 3)}
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SQL {INSERT INTO def VALUES(4, 5, 6)}
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TEST 30 {
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do_test $testid {
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execsql {
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SELECT * FROM tbl2, def WHERE d = x;
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}
|
|
} {1 2 3 1 2 3}
|
|
}
|
|
SQL {COMMIT}
|
|
TEST 31 {
|
|
do_test $testid {
|
|
execsql {
|
|
SELECT * FROM tbl2, def WHERE d = x;
|
|
}
|
|
} {1 2 3 1 2 3}
|
|
}
|
|
}
|
|
|
|
# Test what happens when a malloc() fails while there are other active
|
|
# statements. This changes the way sqlite3VdbeHalt() works.
|
|
TEST 32 {
|
|
if {![info exists ::STMT32]} {
|
|
set sql "SELECT name FROM sqlite_master"
|
|
set ::STMT32 [sqlite3_prepare $::DB $sql -1 DUMMY]
|
|
do_test $testid {
|
|
sqlite3_step $::STMT32
|
|
} {SQLITE_ROW}
|
|
}
|
|
}
|
|
SQL BEGIN
|
|
TEST 33 {
|
|
do_test $testid {
|
|
execsql {SELECT * FROM ghi}
|
|
} {a b c 1 2 3}
|
|
}
|
|
SQL -norollback {
|
|
-- There is a unique index on ghi(g), so this statement may not cause
|
|
-- an automatic ROLLBACK. Hence the "-norollback" switch.
|
|
INSERT INTO ghi SELECT '2'||g, h, i FROM ghi;
|
|
}
|
|
TEST 34 {
|
|
if {[info exists ::STMT32]} {
|
|
do_test $testid {
|
|
sqlite3_finalize $::STMT32
|
|
} {SQLITE_OK}
|
|
unset ::STMT32
|
|
}
|
|
}
|
|
SQL COMMIT
|
|
|
|
#
|
|
# End of test program declaration
|
|
#--------------------------------------------------------------------------
|
|
|
|
proc run_test {arglist iRepeat {pcstart 0} {iFailStart 1}} {
|
|
if {[llength $arglist] %2} {
|
|
error "Uneven number of arguments to TEST"
|
|
}
|
|
|
|
for {set i 0} {$i < $pcstart} {incr i} {
|
|
set k2 [lindex $arglist [expr {2 * $i}]]
|
|
set v2 [lindex $arglist [expr {2 * $i + 1}]]
|
|
set ac [sqlite3_get_autocommit $::DB] ;# Auto-Commit
|
|
switch -- $k2 {
|
|
-sql {db eval [lindex $v2 2]}
|
|
-prep {db eval $v2}
|
|
-debug {eval $v2}
|
|
}
|
|
set nac [sqlite3_get_autocommit $::DB] ;# New Auto-Commit
|
|
if {$ac && !$nac} {set begin_pc $i}
|
|
}
|
|
|
|
db rollback_hook [list incr ::rollback_hook_count]
|
|
|
|
set iFail $iFailStart
|
|
set pc $pcstart
|
|
while {$pc*2 < [llength $arglist]} {
|
|
# Fetch the current instruction type and payload.
|
|
set k [lindex $arglist [expr {2 * $pc}]]
|
|
set v [lindex $arglist [expr {2 * $pc + 1}]]
|
|
|
|
# Id of this iteration:
|
|
set iterid "pc=$pc.iFail=$iFail$k"
|
|
|
|
switch -- $k {
|
|
|
|
-test {
|
|
foreach {id script} $v {}
|
|
set testid "malloc3-(test $id).$iterid"
|
|
eval $script
|
|
incr pc
|
|
}
|
|
|
|
-sql {
|
|
set ::rollback_hook_count 0
|
|
|
|
set id [lindex $v 0]
|
|
set testid "malloc3-(integrity $id).$iterid"
|
|
|
|
set ac [sqlite3_get_autocommit $::DB] ;# Auto-Commit
|
|
sqlite3_memdebug_fail $iFail -repeat 0
|
|
set rc [catch {db eval [lindex $v 2]} msg] ;# True error occurs
|
|
set nac [sqlite3_get_autocommit $::DB] ;# New Auto-Commit
|
|
|
|
if {$rc != 0 && $nac && !$ac} {
|
|
# Before [db eval] the auto-commit flag was clear. Now it
|
|
# is set. Since an error occurred we assume this was not a
|
|
# commit - therefore a rollback occurred. Check that the
|
|
# rollback-hook was invoked.
|
|
do_test malloc3-rollback_hook_count.$iterid {
|
|
set ::rollback_hook_count
|
|
} {1}
|
|
}
|
|
|
|
set nFail [sqlite3_memdebug_fail -1 -benigncnt nBenign]
|
|
if {$rc == 0} {
|
|
# Successful execution of sql. The number of failed malloc()
|
|
# calls should be equal to the number of benign failures.
|
|
# Otherwise a malloc() failed and the error was not reported.
|
|
#
|
|
set expr {$nFail!=$nBenign}
|
|
if {[expr $expr]} {
|
|
error "Unreported malloc() failure, test \"$testid\", $expr"
|
|
}
|
|
|
|
if {$ac && !$nac} {
|
|
# Before the [db eval] the auto-commit flag was set, now it
|
|
# is clear. We can deduce that a "BEGIN" statement has just
|
|
# been successfully executed.
|
|
set begin_pc $pc
|
|
}
|
|
|
|
incr pc
|
|
set iFail 1
|
|
integrity_check $testid
|
|
} elseif {[regexp {.*out of memory} $msg] || [db errorcode] == 3082} {
|
|
# Out of memory error, as expected.
|
|
#
|
|
integrity_check $testid
|
|
incr iFail
|
|
if {$nac && !$ac} {
|
|
if {![lindex $v 1] && [db errorcode] != 3082} {
|
|
# error "Statement \"[lindex $v 2]\" caused a rollback"
|
|
}
|
|
|
|
for {set i $begin_pc} {$i < $pc} {incr i} {
|
|
set k2 [lindex $arglist [expr {2 * $i}]]
|
|
set v2 [lindex $arglist [expr {2 * $i + 1}]]
|
|
set catchupsql ""
|
|
switch -- $k2 {
|
|
-sql {set catchupsql [lindex $v2 2]}
|
|
-prep {set catchupsql $v2}
|
|
}
|
|
db eval $catchupsql
|
|
}
|
|
}
|
|
} else {
|
|
error $msg
|
|
}
|
|
|
|
# back up to the previous "-test" block.
|
|
while {[lindex $arglist [expr {2 * ($pc - 1)}]] == "-test"} {
|
|
incr pc -1
|
|
}
|
|
}
|
|
|
|
-prep {
|
|
db eval $v
|
|
incr pc
|
|
}
|
|
|
|
-debug {
|
|
eval $v
|
|
incr pc
|
|
}
|
|
|
|
default { error "Unknown switch: $k" }
|
|
}
|
|
}
|
|
}
|
|
|
|
# Turn off the Tcl interface's prepared statement caching facility. Then
|
|
# run the tests with "persistent" malloc failures.
|
|
sqlite3_extended_result_codes db 1
|
|
db cache size 0
|
|
run_test $::run_test_script 1
|
|
|
|
# Close and reopen the db.
|
|
db close
|
|
forcedelete test.db test.db-journal test2.db test2.db-journal
|
|
sqlite3 db test.db
|
|
sqlite3_extended_result_codes db 1
|
|
set ::DB [sqlite3_connection_pointer db]
|
|
|
|
# Turn off the Tcl interface's prepared statement caching facility in
|
|
# the new connnection. Then run the tests with "transient" malloc failures.
|
|
db cache size 0
|
|
run_test $::run_test_script 0
|
|
|
|
sqlite3_memdebug_fail -1
|
|
finish_test
|