sql/database_unittest.cc - chromium/src - Git at Google

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include <stddef.h>
 #include <stdint.h>

 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_file.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/test/gtest_util.h"
 #include "base/test/metrics/histogram_tester.h"
 #include "base/test/scoped_feature_list.h"
 #include "base/trace_event/process_memory_dump.h"
 #include "build/build_config.h"
 #include "sql/database.h"
 #include "sql/database_memory_dump_provider.h"
 #include "sql/meta_table.h"
 #include "sql/statement.h"
 #include "sql/test/database_test_peer.h"
 #include "sql/test/error_callback_support.h"
 #include "sql/test/scoped_error_expecter.h"
 #include "sql/test/sql_test_base.h"
 #include "sql/test/test_helpers.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/sqlite/sqlite3.h"

 namespace sql {

 namespace {

 using sql::test::ExecuteWithResult;

 // Helper to return the count of items in sqlite_master.  Return -1 in
 // case of error.
 int SqliteMasterCount(sql::Database* db) {
   const char* kMasterCount = "SELECT COUNT(*) FROM sqlite_master";
   sql::Statement s(db->GetUniqueStatement(kMasterCount));
   return s.Step() ? s.ColumnInt(0) : -1;
 }

 // Track the number of valid references which share the same pointer.
 // This is used to allow testing an implicitly use-after-free case by
 // explicitly having the ref count live longer than the object.
 class RefCounter {
  public:
   RefCounter(size_t* counter) : counter_(counter) { (*counter_)++; }
   RefCounter(const RefCounter& other) : counter_(other.counter_) {
     (*counter_)++;
   }
   ~RefCounter() { (*counter_)--; }

  private:
   size_t* counter_;

   DISALLOW_ASSIGN(RefCounter);
 };

 // Empty callback for implementation of ErrorCallbackSetHelper().
 void IgnoreErrorCallback(int error, sql::Statement* stmt) {}

 void ErrorCallbackSetHelper(sql::Database* db,
                             size_t* counter,
                             const RefCounter& r,
                             int error,
                             sql::Statement* stmt) {
   // The ref count should not go to zero when changing the callback.
   EXPECT_GT(*counter, 0u);
   db->set_error_callback(base::BindRepeating(&IgnoreErrorCallback));
   EXPECT_GT(*counter, 0u);
 }

 void ErrorCallbackResetHelper(sql::Database* db,
                               size_t* counter,
                               const RefCounter& r,
                               int error,
                               sql::Statement* stmt) {
   // The ref count should not go to zero when clearing the callback.
   EXPECT_GT(*counter, 0u);
   db->reset_error_callback();
   EXPECT_GT(*counter, 0u);
 }

 // Handle errors by blowing away the database.
 void RazeErrorCallback(sql::Database* db,
                        int expected_error,
                        int error,
                        sql::Statement* stmt) {
   // Nothing here needs extended errors at this time.
   EXPECT_EQ(expected_error, expected_error & 0xff);
   EXPECT_EQ(expected_error, error & 0xff);
   db->RazeAndClose();
 }

 #if defined(OS_POSIX)
 // Set a umask and restore the old mask on destruction.  Cribbed from
 // shared_memory_unittest.cc.  Used by POSIX-only UserPermission test.
 class ScopedUmaskSetter {
  public:
   explicit ScopedUmaskSetter(mode_t target_mask) {
     old_umask_ = umask(target_mask);
   }
   ~ScopedUmaskSetter() { umask(old_umask_); }

  private:
   mode_t old_umask_;
   DISALLOW_IMPLICIT_CONSTRUCTORS(ScopedUmaskSetter);
 };
 #endif  // defined(OS_POSIX)

 }  // namespace

 using SQLDatabaseTest = sql::SQLTestBase;

 TEST_F(SQLDatabaseTest, Execute) {
   // Valid statement should return true.
   ASSERT_TRUE(db().Execute("CREATE TABLE foo (a, b)"));
   EXPECT_EQ(SQLITE_OK, db().GetErrorCode());

   // Invalid statement should fail.
   ASSERT_EQ(SQLITE_ERROR,
             db().ExecuteAndReturnErrorCode("CREATE TAB foo (a, b"));
   EXPECT_EQ(SQLITE_ERROR, db().GetErrorCode());
 }

 TEST_F(SQLDatabaseTest, ExecuteWithErrorCode) {
   ASSERT_EQ(SQLITE_OK,
             db().ExecuteAndReturnErrorCode("CREATE TABLE foo (a, b)"));
   ASSERT_EQ(SQLITE_ERROR, db().ExecuteAndReturnErrorCode("CREATE TABLE TABLE"));
   ASSERT_EQ(SQLITE_ERROR, db().ExecuteAndReturnErrorCode(
                               "INSERT INTO foo(a, b) VALUES (1, 2, 3, 4)"));
 }

 TEST_F(SQLDatabaseTest, CachedStatement) {
   sql::StatementID id1 = SQL_FROM_HERE;
   sql::StatementID id2 = SQL_FROM_HERE;
   static const char kId1Sql[] = "SELECT a FROM foo";
   static const char kId2Sql[] = "SELECT b FROM foo";

   ASSERT_TRUE(db().Execute("CREATE TABLE foo (a, b)"));
   ASSERT_TRUE(db().Execute("INSERT INTO foo(a, b) VALUES (12, 13)"));

   sqlite3_stmt* raw_id1_statement;
   sqlite3_stmt* raw_id2_statement;
   {
     scoped_refptr<sql::Database::StatementRef> ref_from_id1 =
         db().GetCachedStatement(id1, kId1Sql);
     raw_id1_statement = ref_from_id1->stmt();

     sql::Statement from_id1(std::move(ref_from_id1));
     ASSERT_TRUE(from_id1.is_valid());
     ASSERT_TRUE(from_id1.Step());
     EXPECT_EQ(12, from_id1.ColumnInt(0));

     scoped_refptr<sql::Database::StatementRef> ref_from_id2 =
         db().GetCachedStatement(id2, kId2Sql);
     raw_id2_statement = ref_from_id2->stmt();
     EXPECT_NE(raw_id1_statement, raw_id2_statement);

     sql::Statement from_id2(std::move(ref_from_id2));
     ASSERT_TRUE(from_id2.is_valid());
     ASSERT_TRUE(from_id2.Step());
     EXPECT_EQ(13, from_id2.ColumnInt(0));
   }

   {
     scoped_refptr<sql::Database::StatementRef> ref_from_id1 =
         db().GetCachedStatement(id1, kId1Sql);
     EXPECT_EQ(raw_id1_statement, ref_from_id1->stmt())
         << "statement was not cached";

     sql::Statement from_id1(std::move(ref_from_id1));
     ASSERT_TRUE(from_id1.is_valid());
     ASSERT_TRUE(from_id1.Step()) << "cached statement was not reset";
     EXPECT_EQ(12, from_id1.ColumnInt(0));

     scoped_refptr<sql::Database::StatementRef> ref_from_id2 =
         db().GetCachedStatement(id2, kId2Sql);
     EXPECT_EQ(raw_id2_statement, ref_from_id2->stmt())
         << "statement was not cached";

     sql::Statement from_id2(std::move(ref_from_id2));
     ASSERT_TRUE(from_id2.is_valid());
     ASSERT_TRUE(from_id2.Step()) << "cached statement was not reset";
     EXPECT_EQ(13, from_id2.ColumnInt(0));
   }

   EXPECT_DCHECK_DEATH(db().GetCachedStatement(id1, kId2Sql))
       << "Using a different SQL with the same statement ID should DCHECK";
   EXPECT_DCHECK_DEATH(db().GetCachedStatement(id2, kId1Sql))
       << "Using a different SQL with the same statement ID should DCHECK";
 }

 TEST_F(SQLDatabaseTest, IsSQLValidTest) {
   ASSERT_TRUE(db().Execute("CREATE TABLE foo (a, b)"));
   ASSERT_TRUE(db().IsSQLValid("SELECT a FROM foo"));
   ASSERT_FALSE(db().IsSQLValid("SELECT no_exist FROM foo"));
 }

 TEST_F(SQLDatabaseTest, DoesTableExist) {
   EXPECT_FALSE(db().DoesTableExist("foo"));
   EXPECT_FALSE(db().DoesTableExist("foo_index"));

   ASSERT_TRUE(db().Execute("CREATE TABLE foo (a, b)"));
   ASSERT_TRUE(db().Execute("CREATE INDEX foo_index ON foo (a)"));
   EXPECT_TRUE(db().DoesTableExist("foo"));
   EXPECT_FALSE(db().DoesTableExist("foo_index"));

   // DoesTableExist() is case-sensitive.
   EXPECT_FALSE(db().DoesTableExist("Foo"));
   EXPECT_FALSE(db().DoesTableExist("FOO"));
 }

 TEST_F(SQLDatabaseTest, DoesIndexExist) {
   ASSERT_TRUE(db().Execute("CREATE TABLE foo (a, b)"));
   EXPECT_FALSE(db().DoesIndexExist("foo"));
   EXPECT_FALSE(db().DoesIndexExist("foo_ubdex"));

   ASSERT_TRUE(db().Execute("CREATE INDEX foo_index ON foo (a)"));
   EXPECT_TRUE(db().DoesIndexExist("foo_index"));
   EXPECT_FALSE(db().DoesIndexExist("foo"));

   // DoesIndexExist() is case-sensitive.
   EXPECT_FALSE(db().DoesIndexExist("Foo_index"));
   EXPECT_FALSE(db().DoesIndexExist("Foo_Index"));
   EXPECT_FALSE(db().DoesIndexExist("FOO_INDEX"));
 }

 TEST_F(SQLDatabaseTest, DoesViewExist) {
   EXPECT_FALSE(db().DoesViewExist("voo"));
   ASSERT_TRUE(db().Execute("CREATE VIEW voo (a) AS SELECT 1"));
   EXPECT_FALSE(db().DoesIndexExist("voo"));
   EXPECT_FALSE(db().DoesTableExist("voo"));
   EXPECT_TRUE(db().DoesViewExist("voo"));

   // DoesTableExist() is case-sensitive.
   EXPECT_FALSE(db().DoesViewExist("Voo"));
   EXPECT_FALSE(db().DoesViewExist("VOO"));
 }

 TEST_F(SQLDatabaseTest, DoesColumnExist) {
   ASSERT_TRUE(db().Execute("CREATE TABLE foo (a, b)"));

   EXPECT_FALSE(db().DoesColumnExist("foo", "bar"));
   EXPECT_TRUE(db().DoesColumnExist("foo", "a"));

   ASSERT_FALSE(db().DoesTableExist("bar"));
   EXPECT_FALSE(db().DoesColumnExist("bar", "b"));

   // SQLite resolves table/column names without case sensitivity.
   EXPECT_TRUE(db().DoesColumnExist("FOO", "A"));
   EXPECT_TRUE(db().DoesColumnExist("FOO", "a"));
   EXPECT_TRUE(db().DoesColumnExist("foo", "A"));
 }

 TEST_F(SQLDatabaseTest, GetLastInsertRowId) {
   ASSERT_TRUE(db().Execute("CREATE TABLE foo (id INTEGER PRIMARY KEY, value)"));

   ASSERT_TRUE(db().Execute("INSERT INTO foo (value) VALUES (12)"));

   // Last insert row ID should be valid.
   int64_t row = db().GetLastInsertRowId();
   EXPECT_LT(0, row);

   // It should be the primary key of the row we just inserted.
   sql::Statement s(db().GetUniqueStatement("SELECT value FROM foo WHERE id=?"));
   s.BindInt64(0, row);
   ASSERT_TRUE(s.Step());
   EXPECT_EQ(12, s.ColumnInt(0));
 }

 TEST_F(SQLDatabaseTest, Rollback) {
   ASSERT_TRUE(db().BeginTransaction());
   ASSERT_TRUE(db().BeginTransaction());
   EXPECT_EQ(2, db().transaction_nesting());
   db().RollbackTransaction();
   EXPECT_FALSE(db().CommitTransaction());
   EXPECT_TRUE(db().BeginTransaction());
 }

 // Test the scoped error expecter by attempting to insert a duplicate
 // value into an index.
 TEST_F(SQLDatabaseTest, ScopedErrorExpecter) {
   const char* kCreateSql = "CREATE TABLE foo (id INTEGER UNIQUE)";
   ASSERT_TRUE(db().Execute(kCreateSql));
   ASSERT_TRUE(db().Execute("INSERT INTO foo (id) VALUES (12)"));

   {
     sql::test::ScopedErrorExpecter expecter;
     expecter.ExpectError(SQLITE_CONSTRAINT);
     ASSERT_FALSE(db().Execute("INSERT INTO foo (id) VALUES (12)"));
     ASSERT_TRUE(expecter.SawExpectedErrors());
   }
 }

 // Test that clients of GetUntrackedStatement() can test corruption-handling
 // with ScopedErrorExpecter.
 TEST_F(SQLDatabaseTest, ScopedIgnoreUntracked) {
   const char* kCreateSql = "CREATE TABLE foo (id INTEGER UNIQUE)";
   ASSERT_TRUE(db().Execute(kCreateSql));
   ASSERT_FALSE(db().DoesTableExist("bar"));
   ASSERT_TRUE(db().DoesTableExist("foo"));
   ASSERT_TRUE(db().DoesColumnExist("foo", "id"));
   db().Close();

   // Corrupt the database so that nothing works, including PRAGMAs.
   ASSERT_TRUE(CorruptSizeInHeaderOfDB());

   {
     sql::test::ScopedErrorExpecter expecter;
     expecter.ExpectError(SQLITE_CORRUPT);
     ASSERT_TRUE(db().Open(db_path()));
     ASSERT_FALSE(db().DoesTableExist("bar"));
     ASSERT_FALSE(db().DoesTableExist("foo"));
     ASSERT_FALSE(db().DoesColumnExist("foo", "id"));
     ASSERT_TRUE(expecter.SawExpectedErrors());
   }
 }

 TEST_F(SQLDatabaseTest, ErrorCallback) {
   const char* kCreateSql = "CREATE TABLE foo (id INTEGER UNIQUE)";
   ASSERT_TRUE(db().Execute(kCreateSql));
   ASSERT_TRUE(db().Execute("INSERT INTO foo (id) VALUES (12)"));

   int error = SQLITE_OK;
   {
     sql::ScopedErrorCallback sec(
         &db(), base::BindRepeating(&sql::CaptureErrorCallback, &error));
     EXPECT_FALSE(db().Execute("INSERT INTO foo (id) VALUES (12)"));

     // Later versions of SQLite throw SQLITE_CONSTRAINT_UNIQUE.  The specific
     // sub-error isn't really important.
     EXPECT_EQ(SQLITE_CONSTRAINT, (error & 0xff));
   }

   // Callback is no longer in force due to reset.
   {
     error = SQLITE_OK;
     sql::test::ScopedErrorExpecter expecter;
     expecter.ExpectError(SQLITE_CONSTRAINT);
     ASSERT_FALSE(db().Execute("INSERT INTO foo (id) VALUES (12)"));
     ASSERT_TRUE(expecter.SawExpectedErrors());
     EXPECT_EQ(SQLITE_OK, error);
   }

   // base::BindRepeating() can curry arguments to be passed by const reference
   // to the callback function.  If the callback function calls
   // re/set_error_callback(), the storage for those arguments can be
   // deleted while the callback function is still executing.
   //
   // RefCounter() counts how many objects are live using an external
   // count.  The same counter is passed to the callback, so that it
   // can check directly even if the RefCounter object is no longer
   // live.
   {
     size_t count = 0;
     sql::ScopedErrorCallback sec(
         &db(), base::BindRepeating(&ErrorCallbackSetHelper, &db(), &count,
                                    RefCounter(&count)));

     EXPECT_FALSE(db().Execute("INSERT INTO foo (id) VALUES (12)"));
   }

   // Same test, but reset_error_callback() case.
   {
     size_t count = 0;
     sql::ScopedErrorCallback sec(
         &db(), base::BindRepeating(&ErrorCallbackResetHelper, &db(), &count,
                                    RefCounter(&count)));

     EXPECT_FALSE(db().Execute("INSERT INTO foo (id) VALUES (12)"));
   }
 }

 // Test that sql::Database::Raze() results in a database without the
 // tables from the original database.
 TEST_F(SQLDatabaseTest, Raze) {
   const char* kCreateSql = "CREATE TABLE foo (id INTEGER PRIMARY KEY, value)";
   ASSERT_TRUE(db().Execute(kCreateSql));
   ASSERT_TRUE(db().Execute("INSERT INTO foo (value) VALUES (12)"));

   int pragma_auto_vacuum = 0;
   {
     sql::Statement s(db().GetUniqueStatement("PRAGMA auto_vacuum"));
     ASSERT_TRUE(s.Step());
     pragma_auto_vacuum = s.ColumnInt(0);
     ASSERT_TRUE(pragma_auto_vacuum == 0 || pragma_auto_vacuum == 1);
   }

   // If auto_vacuum is set, there's an extra page to maintain a freelist.
   const int kExpectedPageCount = 2 + pragma_auto_vacuum;

   {
     sql::Statement s(db().GetUniqueStatement("PRAGMA page_count"));
     ASSERT_TRUE(s.Step());
     EXPECT_EQ(kExpectedPageCount, s.ColumnInt(0));
   }

   {
     sql::Statement s(db().GetUniqueStatement("SELECT * FROM sqlite_master"));
     ASSERT_TRUE(s.Step());
     EXPECT_EQ("table", s.ColumnString(0));
     EXPECT_EQ("foo", s.ColumnString(1));
     EXPECT_EQ("foo", s.ColumnString(2));
     // Table "foo" is stored in the last page of the file.
     EXPECT_EQ(kExpectedPageCount, s.ColumnInt(3));
     EXPECT_EQ(kCreateSql, s.ColumnString(4));
   }

   ASSERT_TRUE(db().Raze());

   {
     sql::Statement s(db().GetUniqueStatement("PRAGMA page_count"));
     ASSERT_TRUE(s.Step());
     EXPECT_EQ(1, s.ColumnInt(0));
   }

   ASSERT_EQ(0, SqliteMasterCount(&db()));

   {
     sql::Statement s(db().GetUniqueStatement("PRAGMA auto_vacuum"));
     ASSERT_TRUE(s.Step());
     // The new database has the same auto_vacuum as a fresh database.
     EXPECT_EQ(pragma_auto_vacuum, s.ColumnInt(0));
   }
 }

 // Helper for SQLDatabaseTest.RazePageSize.  Creates a fresh db based on
 // db_prefix, with the given initial page size, and verifies it against the
 // expected size.  Then changes to the final page size and razes, verifying that
 // the fresh database ends up with the expected final page size.
 void TestPageSize(const base::FilePath& db_prefix,
                   int initial_page_size,
                   const std::string& expected_initial_page_size,
                   int final_page_size,
                   const std::string& expected_final_page_size) {
   static const char kCreateSql[] = "CREATE TABLE x (t TEXT)";
   static const char kInsertSql1[] = "INSERT INTO x VALUES ('This is a test')";
   static const char kInsertSql2[] = "INSERT INTO x VALUES ('That was a test')";

   const base::FilePath db_path = db_prefix.InsertBeforeExtensionASCII(
       base::NumberToString(initial_page_size));
   sql::Database::Delete(db_path);
   sql::Database db;
   db.set_page_size(initial_page_size);
   ASSERT_TRUE(db.Open(db_path));
   ASSERT_TRUE(db.Execute(kCreateSql));
   ASSERT_TRUE(db.Execute(kInsertSql1));
   ASSERT_TRUE(db.Execute(kInsertSql2));
   ASSERT_EQ(expected_initial_page_size,
             ExecuteWithResult(&db, "PRAGMA page_size"));

   // Raze will use the page size set in the connection object, which may not
   // match the file's page size.
   db.set_page_size(final_page_size);
   ASSERT_TRUE(db.Raze());

   // SQLite 3.10.2 (at least) has a quirk with the sqlite3_backup() API (used by
   // Raze()) which causes the destination database to remember the previous
   // page_size, even if the overwriting database changed the page_size.  Access
   // the actual database to cause the cached value to be updated.
   EXPECT_EQ("0", ExecuteWithResult(&db, "SELECT COUNT(*) FROM sqlite_master"));

   EXPECT_EQ(expected_final_page_size,
             ExecuteWithResult(&db, "PRAGMA page_size"));
   EXPECT_EQ("1", ExecuteWithResult(&db, "PRAGMA page_count"));
 }

 // Verify that sql::Recovery maintains the page size, and the virtual table
 // works with page sizes other than SQLite's default.  Also verify the case
 // where the default page size has changed.
 TEST_F(SQLDatabaseTest, RazePageSize) {
   const std::string default_page_size =
       ExecuteWithResult(&db(), "PRAGMA page_size");

   // Sync uses 32k pages.
   EXPECT_NO_FATAL_FAILURE(
       TestPageSize(db_path(), 32768, "32768", 32768, "32768"));

   // Many clients use 4k pages.  This is the SQLite default after 3.12.0.
   EXPECT_NO_FATAL_FAILURE(TestPageSize(db_path(), 4096, "4096", 4096, "4096"));

   // 1k is the default page size before 3.12.0.
   EXPECT_NO_FATAL_FAILURE(TestPageSize(db_path(), 1024, "1024", 1024, "1024"));

   EXPECT_NO_FATAL_FAILURE(TestPageSize(db_path(), 2048, "2048", 4096, "4096"));

   // Databases with no page size specified should result in the default
   // page size.  2k has never been the default page size.
   ASSERT_NE("2048", default_page_size);
   EXPECT_NO_FATAL_FAILURE(TestPageSize(
       db_path(), 2048, "2048", Database::kDefaultPageSize, default_page_size));
 }

 // Test that Raze() results are seen in other connections.
 TEST_F(SQLDatabaseTest, RazeMultiple) {
   const char* kCreateSql = "CREATE TABLE foo (id INTEGER PRIMARY KEY, value)";
   ASSERT_TRUE(db().Execute(kCreateSql));

   sql::Database other_db;
   ASSERT_TRUE(other_db.Open(db_path()));

   // Check that the second connection sees the table.
   ASSERT_EQ(1, SqliteMasterCount(&other_db));

   ASSERT_TRUE(db().Raze());

   // The second connection sees the updated database.
   ASSERT_EQ(0, SqliteMasterCount(&other_db));
 }

 TEST_F(SQLDatabaseTest, RazeLocked) {
   const char* kCreateSql = "CREATE TABLE foo (id INTEGER PRIMARY KEY, value)";
   ASSERT_TRUE(db().Execute(kCreateSql));

   // Open a transaction and write some data in a second connection.
   // This will acquire a PENDING or EXCLUSIVE transaction, which will
   // cause the raze to fail.
   sql::Database other_db;
   ASSERT_TRUE(other_db.Open(db_path()));
   ASSERT_TRUE(other_db.BeginTransaction());
   const char* kInsertSql = "INSERT INTO foo VALUES (1, 'data')";
   ASSERT_TRUE(other_db.Execute(kInsertSql));

   ASSERT_FALSE(db().Raze());

   // Works after COMMIT.
   ASSERT_TRUE(other_db.CommitTransaction());
   ASSERT_TRUE(db().Raze());

   // Re-create the database.
   ASSERT_TRUE(db().Execute(kCreateSql));
   ASSERT_TRUE(db().Execute(kInsertSql));

   // An unfinished read transaction in the other connection also
   // blocks raze.
   const char* kQuery = "SELECT COUNT(*) FROM foo";
   sql::Statement s(other_db.GetUniqueStatement(kQuery));
   ASSERT_TRUE(s.Step());
   ASSERT_FALSE(db().Raze());

   // Complete the statement unlocks the database.
   ASSERT_FALSE(s.Step());
   ASSERT_TRUE(db().Raze());
 }

 // Verify that Raze() can handle an empty file.  SQLite should treat
 // this as an empty database.
 TEST_F(SQLDatabaseTest, RazeEmptyDB) {
   const char* kCreateSql = "CREATE TABLE foo (id INTEGER PRIMARY KEY, value)";
   ASSERT_TRUE(db().Execute(kCreateSql));
   db().Close();

   TruncateDatabase();

   ASSERT_TRUE(db().Open(db_path()));
   ASSERT_TRUE(db().Raze());
   EXPECT_EQ(0, SqliteMasterCount(&db()));
 }

 // Verify that Raze() can handle a file of junk.
 TEST_F(SQLDatabaseTest, RazeNOTADB) {
   db().Close();
   sql::Database::Delete(db_path());
   ASSERT_FALSE(GetPathExists(db_path()));

   WriteJunkToDatabase(SQLTestBase::TYPE_OVERWRITE_AND_TRUNCATE);
   ASSERT_TRUE(GetPathExists(db_path()));

   // SQLite will successfully open the handle, but fail when running PRAGMA
   // statements that access the database.
   {
     sql::test::ScopedErrorExpecter expecter;
     expecter.ExpectError(SQLITE_NOTADB);

     EXPECT_TRUE(db().Open(db_path()));
     ASSERT_TRUE(expecter.SawExpectedErrors());
   }
   EXPECT_TRUE(db().Raze());
   db().Close();

   // Now empty, the open should open an empty database.
   EXPECT_TRUE(db().Open(db_path()));
   EXPECT_EQ(0, SqliteMasterCount(&db()));
 }

 // Verify that Raze() can handle a database overwritten with garbage.
 TEST_F(SQLDatabaseTest, RazeNOTADB2) {
   const char* kCreateSql = "CREATE TABLE foo (id INTEGER PRIMARY KEY, value)";
   ASSERT_TRUE(db().Execute(kCreateSql));
   ASSERT_EQ(1, SqliteMasterCount(&db()));
   db().Close();

   WriteJunkToDatabase(SQLTestBase::TYPE_OVERWRITE);

   // SQLite will successfully open the handle, but will fail with
   // SQLITE_NOTADB on pragma statemenets which attempt to read the
   // corrupted header.
   {
     sql::test::ScopedErrorExpecter expecter;
     expecter.ExpectError(SQLITE_NOTADB);
     EXPECT_TRUE(db().Open(db_path()));
     ASSERT_TRUE(expecter.SawExpectedErrors());
   }
   EXPECT_TRUE(db().Raze());
   db().Close();

   // Now empty, the open should succeed with an empty database.
   EXPECT_TRUE(db().Open(db_path()));
   EXPECT_EQ(0, SqliteMasterCount(&db()));
 }

 // Test that a callback from Open() can raze the database.  This is
 // essential for cases where the Open() can fail entirely, so the
 // Raze() cannot happen later.  Additionally test that when the
 // callback does this during Open(), the open is retried and succeeds.
 TEST_F(SQLDatabaseTest, RazeCallbackReopen) {
   const char* kCreateSql = "CREATE TABLE foo (id INTEGER PRIMARY KEY, value)";
   ASSERT_TRUE(db().Execute(kCreateSql));
   ASSERT_EQ(1, SqliteMasterCount(&db()));
   db().Close();

   // Corrupt the database so that nothing works, including PRAGMAs.
   ASSERT_TRUE(CorruptSizeInHeaderOfDB());

   // Open() will succeed, even though the PRAGMA calls within will
   // fail with SQLITE_CORRUPT, as will this PRAGMA.
   {
     sql::test::ScopedErrorExpecter expecter;
     expecter.ExpectError(SQLITE_CORRUPT);
     ASSERT_TRUE(db().Open(db_path()));
     ASSERT_FALSE(db().Execute("PRAGMA auto_vacuum"));
     db().Close();
     ASSERT_TRUE(expecter.SawExpectedErrors());
   }

   db().set_error_callback(
       base::BindRepeating(&RazeErrorCallback, &db(), SQLITE_CORRUPT));

   // When the PRAGMA calls in Open() raise SQLITE_CORRUPT, the error
   // callback will call RazeAndClose().  Open() will then fail and be
   // retried.  The second Open() on the empty database will succeed
   // cleanly.
   ASSERT_TRUE(db().Open(db_path()));
   ASSERT_TRUE(db().Execute("PRAGMA auto_vacuum"));
   EXPECT_EQ(0, SqliteMasterCount(&db()));
 }

 // Basic test of RazeAndClose() operation.
 TEST_F(SQLDatabaseTest, RazeAndClose) {
   const char* kCreateSql = "CREATE TABLE foo (id INTEGER PRIMARY KEY, value)";
   const char* kPopulateSql = "INSERT INTO foo (value) VALUES (12)";

   // Test that RazeAndClose() closes the database, and that the
   // database is empty when re-opened.
   ASSERT_TRUE(db().Execute(kCreateSql));
   ASSERT_TRUE(db().Execute(kPopulateSql));
   ASSERT_TRUE(db().RazeAndClose());
   ASSERT_FALSE(db().is_open());
   db().Close();
   ASSERT_TRUE(db().Open(db_path()));
   ASSERT_EQ(0, SqliteMasterCount(&db()));

   // Test that RazeAndClose() can break transactions.
   ASSERT_TRUE(db().Execute(kCreateSql));
   ASSERT_TRUE(db().Execute(kPopulateSql));
   ASSERT_TRUE(db().BeginTransaction());
   ASSERT_TRUE(db().RazeAndClose());
   ASSERT_FALSE(db().is_open());
   ASSERT_FALSE(db().CommitTransaction());
   db().Close();
   ASSERT_TRUE(db().Open(db_path()));
   ASSERT_EQ(0, SqliteMasterCount(&db()));
 }

 // Test that various operations fail without crashing after
 // RazeAndClose().
 TEST_F(SQLDatabaseTest, RazeAndCloseDiagnostics) {
   const char* kCreateSql = "CREATE TABLE foo (id INTEGER PRIMARY KEY, value)";
   const char* kPopulateSql = "INSERT INTO foo (value) VALUES (12)";
   const char* kSimpleSql = "SELECT 1";

   ASSERT_TRUE(db().Execute(kCreateSql));
   ASSERT_TRUE(db().Execute(kPopulateSql));

   // Test baseline expectations.
   db().Preload();
   ASSERT_TRUE(db().DoesTableExist("foo"));
   ASSERT_TRUE(db().IsSQLValid(kSimpleSql));
   ASSERT_EQ(SQLITE_OK, db().ExecuteAndReturnErrorCode(kSimpleSql));
   ASSERT_TRUE(db().Execute(kSimpleSql));
   ASSERT_TRUE(db().is_open());
   {
     sql::Statement s(db().GetUniqueStatement(kSimpleSql));
     ASSERT_TRUE(s.Step());
   }
   {
     sql::Statement s(db().GetCachedStatement(SQL_FROM_HERE, kSimpleSql));
     ASSERT_TRUE(s.Step());
   }
   ASSERT_TRUE(db().BeginTransaction());
   ASSERT_TRUE(db().CommitTransaction());
   ASSERT_TRUE(db().BeginTransaction());
   db().RollbackTransaction();

   ASSERT_TRUE(db().RazeAndClose());

   // At this point, they should all fail, but not crash.
   db().Preload();
   ASSERT_FALSE(db().DoesTableExist("foo"));
   ASSERT_FALSE(db().IsSQLValid(kSimpleSql));
   ASSERT_EQ(SQLITE_ERROR, db().ExecuteAndReturnErrorCode(kSimpleSql));
   ASSERT_FALSE(db().Execute(kSimpleSql));
   ASSERT_FALSE(db().is_open());
   {
     sql::Statement s(db().GetUniqueStatement(kSimpleSql));
     ASSERT_FALSE(s.Step());
   }
   {
     sql::Statement s(db().GetCachedStatement(SQL_FROM_HERE, kSimpleSql));
     ASSERT_FALSE(s.Step());
   }
   ASSERT_FALSE(db().BeginTransaction());
   ASSERT_FALSE(db().CommitTransaction());
   ASSERT_FALSE(db().BeginTransaction());
   db().RollbackTransaction();

   // Close normally to reset the poisoned flag.
   db().Close();

 // DEATH tests not supported on Android, iOS, or Fuchsia.
 #if !defined(OS_ANDROID) && !defined(OS_IOS) && !defined(OS_FUCHSIA)
   // Once the real Close() has been called, various calls enforce API
   // usage by becoming fatal in debug mode.  Since DEATH tests are
   // expensive, just test one of them.
   if (DLOG_IS_ON(FATAL)) {
     ASSERT_DEATH({ db().IsSQLValid(kSimpleSql); },
                  "Illegal use of Database without a db");
   }
 #endif  // !defined(OS_ANDROID) && !defined(OS_IOS) && !defined(OS_FUCHSIA)
 }

 // TODO(shess): Spin up a background thread to hold other_db, to more
 // closely match real life.  That would also allow testing
 // RazeWithTimeout().

 // On Windows, truncate silently fails against a memory-mapped file.  One goal
 // of Raze() is to truncate the file to remove blocks which generate I/O errors.
 // Test that Raze() turns off memory mapping so that the file is truncated.
 // [This would not cover the case of multiple connections where one of the other
 // connections is memory-mapped.  That is infrequent in Chromium.]
 TEST_F(SQLDatabaseTest, RazeTruncate) {
   // The empty database has 0 or 1 pages.  Raze() should leave it with exactly 1
   // page.  Not checking directly because auto_vacuum on Android adds a freelist
   // page.
   ASSERT_TRUE(db().Raze());
   int64_t expected_size;
   ASSERT_TRUE(base::GetFileSize(db_path(), &expected_size));
   ASSERT_GT(expected_size, 0);

   // Cause the database to take a few pages.
   const char* kCreateSql = "CREATE TABLE foo (id INTEGER PRIMARY KEY, value)";
   ASSERT_TRUE(db().Execute(kCreateSql));
   for (size_t i = 0; i < 24; ++i) {
     ASSERT_TRUE(
         db().Execute("INSERT INTO foo (value) VALUES (randomblob(1024))"));
   }
   int64_t db_size;
   ASSERT_TRUE(base::GetFileSize(db_path(), &db_size));
   ASSERT_GT(db_size, expected_size);

   // Make a query covering most of the database file to make sure that the
   // blocks are actually mapped into memory.  Empirically, the truncate problem
   // doesn't seem to happen if no blocks are mapped.
   EXPECT_EQ("24576",
             ExecuteWithResult(&db(), "SELECT SUM(LENGTH(value)) FROM foo"));

   ASSERT_TRUE(db().Raze());
   ASSERT_TRUE(base::GetFileSize(db_path(), &db_size));
   ASSERT_EQ(expected_size, db_size);
 }

 #if defined(OS_ANDROID)
 TEST_F(SQLDatabaseTest, SetTempDirForSQL) {
   sql::MetaTable meta_table;
   // Below call needs a temporary directory in sqlite3
   // On Android, it can pass only when the temporary directory is set.
   // Otherwise, sqlite3 doesn't find the correct directory to store
   // temporary files and will report the error 'unable to open
   // database file'.
   ASSERT_TRUE(meta_table.Init(&db(), 4, 4));
 }
 #endif  // defined(OS_ANDROID)

 TEST_F(SQLDatabaseTest, DeleteNonWal) {
   EXPECT_TRUE(db().Execute("CREATE TABLE x (x)"));
   db().Close();

   // Should have both a main database file and a journal file because
   // of journal_mode TRUNCATE.
   base::FilePath journal_path = sql::Database::JournalPath(db_path());
   ASSERT_TRUE(GetPathExists(db_path()));
   ASSERT_TRUE(GetPathExists(journal_path));

   sql::Database::Delete(db_path());
   EXPECT_FALSE(GetPathExists(db_path()));
   EXPECT_FALSE(GetPathExists(journal_path));
 }

 #if defined(OS_POSIX)  // This test operates on POSIX file permissions.
 TEST_F(SQLDatabaseTest, PosixFilePermissions) {
   db().Close();
   sql::Database::Delete(db_path());
   ASSERT_FALSE(GetPathExists(db_path()));

   // If the bots all had a restrictive umask setting such that databases are
   // always created with only the owner able to read them, then the code could
   // break without breaking the tests. Temporarily provide a more permissive
   // umask.
   ScopedUmaskSetter permissive_umask(S_IWGRP | S_IWOTH);

   ASSERT_TRUE(db().Open(db_path()));

   // Cause the journal file to be created. If the default journal_mode is
   // changed back to DELETE, this test will need to be updated.
   EXPECT_TRUE(db().Execute("CREATE TABLE x (x)"));

   int mode;
   ASSERT_TRUE(GetPathExists(db_path()));
   EXPECT_TRUE(base::GetPosixFilePermissions(db_path(), &mode));
   ASSERT_EQ(mode, 0600);

   {
     base::FilePath journal_path = sql::Database::JournalPath(db_path());
     DLOG(ERROR) << "journal_path: " << journal_path;
     ASSERT_TRUE(GetPathExists(journal_path));
     EXPECT_TRUE(base::GetPosixFilePermissions(journal_path, &mode));
     ASSERT_EQ(mode, 0600);
   }

   // Reopen the database and turn on WAL mode.
   db().Close();
   sql::Database::Delete(db_path());
   ASSERT_FALSE(GetPathExists(db_path()));
   ASSERT_TRUE(db().Open(db_path()));
   ASSERT_TRUE(db().Execute("PRAGMA journal_mode = WAL"));
   ASSERT_EQ("wal", ExecuteWithResult(&db(), "PRAGMA journal_mode"));

   // The WAL file is created lazily on first change.
   ASSERT_TRUE(db().Execute("CREATE TABLE foo (a, b)"));

   {
     base::FilePath wal_path = sql::Database::WriteAheadLogPath(db_path());
     ASSERT_TRUE(GetPathExists(wal_path));
     EXPECT_TRUE(base::GetPosixFilePermissions(wal_path, &mode));
     ASSERT_EQ(mode, 0600);

     base::FilePath shm_path = sql::Database::SharedMemoryFilePath(db_path());
     ASSERT_TRUE(GetPathExists(shm_path));
     EXPECT_TRUE(base::GetPosixFilePermissions(shm_path, &mode));
     ASSERT_EQ(mode, 0600);
   }
 }
 #endif  // defined(OS_POSIX)

 // Test that errors start happening once Poison() is called.
 TEST_F(SQLDatabaseTest, Poison) {
   EXPECT_TRUE(db().Execute("CREATE TABLE x (x)"));

   // Before the Poison() call, things generally work.
   EXPECT_TRUE(db().IsSQLValid("INSERT INTO x VALUES ('x')"));
   EXPECT_TRUE(db().Execute("INSERT INTO x VALUES ('x')"));
   {
     sql::Statement s(db().GetUniqueStatement("SELECT COUNT(*) FROM x"));
     ASSERT_TRUE(s.is_valid());
     ASSERT_TRUE(s.Step());
   }

   // Get a statement which is valid before and will exist across Poison().
   sql::Statement valid_statement(
       db().GetUniqueStatement("SELECT COUNT(*) FROM sqlite_master"));
   ASSERT_TRUE(valid_statement.is_valid());
   ASSERT_TRUE(valid_statement.Step());
   valid_statement.Reset(true);

   db().Poison();

   // After the Poison() call, things fail.
   EXPECT_FALSE(db().IsSQLValid("INSERT INTO x VALUES ('x')"));
   EXPECT_FALSE(db().Execute("INSERT INTO x VALUES ('x')"));
   {
     sql::Statement s(db().GetUniqueStatement("SELECT COUNT(*) FROM x"));
     ASSERT_FALSE(s.is_valid());
     ASSERT_FALSE(s.Step());
   }

   // The existing statement has become invalid.
   ASSERT_FALSE(valid_statement.is_valid());
   ASSERT_FALSE(valid_statement.Step());

   // Test that poisoning the database during a transaction works (with errors).
   // RazeErrorCallback() poisons the database, the extra COMMIT causes
   // CommitTransaction() to throw an error while commiting.
   db().set_error_callback(
       base::BindRepeating(&RazeErrorCallback, &db(), SQLITE_ERROR));
   db().Close();
   ASSERT_TRUE(db().Open(db_path()));
   EXPECT_TRUE(db().BeginTransaction());
   EXPECT_TRUE(db().Execute("INSERT INTO x VALUES ('x')"));
   EXPECT_TRUE(db().Execute("COMMIT"));
   EXPECT_FALSE(db().CommitTransaction());
 }

 TEST_F(SQLDatabaseTest, AttachDatabase) {
   EXPECT_TRUE(db().Execute("CREATE TABLE foo (a, b)"));

   // Create a database to attach to.
   base::FilePath attach_path =
       db_path().DirName().AppendASCII("SQLDatabaseAttach.db");
   static const char kAttachmentPoint[] = "other";
   {
     sql::Database other_db;
     ASSERT_TRUE(other_db.Open(attach_path));
     EXPECT_TRUE(other_db.Execute("CREATE TABLE bar (a, b)"));
     EXPECT_TRUE(other_db.Execute("INSERT INTO bar VALUES ('hello', 'world')"));
   }

   // Cannot see the attached database, yet.
   EXPECT_FALSE(db().IsSQLValid("SELECT count(*) from other.bar"));

   EXPECT_TRUE(
       DatabaseTestPeer::AttachDatabase(&db(), attach_path, kAttachmentPoint));
   EXPECT_TRUE(db().IsSQLValid("SELECT count(*) from other.bar"));

   // Queries can touch both databases after the ATTACH.
   EXPECT_TRUE(db().Execute("INSERT INTO foo SELECT a, b FROM other.bar"));
   {
     sql::Statement s(db().GetUniqueStatement("SELECT COUNT(*) FROM foo"));
     ASSERT_TRUE(s.Step());
     EXPECT_EQ(1, s.ColumnInt(0));
   }

   EXPECT_TRUE(DatabaseTestPeer::DetachDatabase(&db(), kAttachmentPoint));
   EXPECT_FALSE(db().IsSQLValid("SELECT count(*) from other.bar"));
 }

 TEST_F(SQLDatabaseTest, AttachDatabaseWithOpenTransaction) {
   EXPECT_TRUE(db().Execute("CREATE TABLE foo (a, b)"));

   // Create a database to attach to.
   base::FilePath attach_path =
       db_path().DirName().AppendASCII("SQLDatabaseAttach.db");
   static const char kAttachmentPoint[] = "other";
   {
     sql::Database other_db;
     ASSERT_TRUE(other_db.Open(attach_path));
     EXPECT_TRUE(other_db.Execute("CREATE TABLE bar (a, b)"));
     EXPECT_TRUE(other_db.Execute("INSERT INTO bar VALUES ('hello', 'world')"));
   }

   // Cannot see the attached database, yet.
   EXPECT_FALSE(db().IsSQLValid("SELECT count(*) from other.bar"));

   // Attach succeeds in a transaction.
   EXPECT_TRUE(db().BeginTransaction());
   EXPECT_TRUE(
       DatabaseTestPeer::AttachDatabase(&db(), attach_path, kAttachmentPoint));
   EXPECT_TRUE(db().IsSQLValid("SELECT count(*) from other.bar"));

   // Queries can touch both databases after the ATTACH.
   EXPECT_TRUE(db().Execute("INSERT INTO foo SELECT a, b FROM other.bar"));
   {
     sql::Statement s(db().GetUniqueStatement("SELECT COUNT(*) FROM foo"));
     ASSERT_TRUE(s.Step());
     EXPECT_EQ(1, s.ColumnInt(0));
   }

   // Detaching the same database fails, database is locked in the transaction.
   {
     sql::test::ScopedErrorExpecter expecter;
     expecter.ExpectError(SQLITE_ERROR);
     EXPECT_FALSE(DatabaseTestPeer::DetachDatabase(&db(), kAttachmentPoint));
     EXPECT_TRUE(db().IsSQLValid("SELECT count(*) from other.bar"));
     ASSERT_TRUE(expecter.SawExpectedErrors());
   }

   // Detach succeeds when the transaction is closed.
   db().RollbackTransaction();
   EXPECT_TRUE(DatabaseTestPeer::DetachDatabase(&db(), kAttachmentPoint));
   EXPECT_FALSE(db().IsSQLValid("SELECT count(*) from other.bar"));
 }

 TEST_F(SQLDatabaseTest, Basic_QuickIntegrityCheck) {
   const char* kCreateSql = "CREATE TABLE foo (id INTEGER PRIMARY KEY, value)";
   ASSERT_TRUE(db().Execute(kCreateSql));
   EXPECT_TRUE(db().QuickIntegrityCheck());
   db().Close();

   ASSERT_TRUE(CorruptSizeInHeaderOfDB());

   {
     sql::test::ScopedErrorExpecter expecter;
     expecter.ExpectError(SQLITE_CORRUPT);
     ASSERT_TRUE(db().Open(db_path()));
     EXPECT_FALSE(db().QuickIntegrityCheck());
     ASSERT_TRUE(expecter.SawExpectedErrors());
   }
 }

 TEST_F(SQLDatabaseTest, Basic_FullIntegrityCheck) {
   const std::string kOk("ok");
   std::vector<std::string> messages;

   const char* kCreateSql = "CREATE TABLE foo (id INTEGER PRIMARY KEY, value)";
   ASSERT_TRUE(db().Execute(kCreateSql));
   EXPECT_TRUE(db().FullIntegrityCheck(&messages));
   EXPECT_EQ(1u, messages.size());
   EXPECT_EQ(kOk, messages[0]);
   db().Close();

   ASSERT_TRUE(CorruptSizeInHeaderOfDB());

   {
     sql::test::ScopedErrorExpecter expecter;
     expecter.ExpectError(SQLITE_CORRUPT);
     ASSERT_TRUE(db().Open(db_path()));
     EXPECT_TRUE(db().FullIntegrityCheck(&messages));
     EXPECT_LT(1u, messages.size());
     EXPECT_NE(kOk, messages[0]);
     ASSERT_TRUE(expecter.SawExpectedErrors());
   }

   // TODO(shess): CorruptTableOrIndex could be used to produce a
   // file that would pass the quick check and fail the full check.
 }

 TEST_F(SQLDatabaseTest, OnMemoryDump) {
   base::trace_event::MemoryDumpArgs args = {
       base::trace_event::MemoryDumpLevelOfDetail::DETAILED};
   base::trace_event::ProcessMemoryDump pmd(args);
   ASSERT_TRUE(db().memory_dump_provider_->OnMemoryDump(args, &pmd));
   EXPECT_GE(pmd.allocator_dumps().size(), 1u);
 }

 // Test that the functions to collect diagnostic data run to completion, without
 // worrying too much about what they generate (since that will change).
 TEST_F(SQLDatabaseTest, CollectDiagnosticInfo) {
   const std::string corruption_info = db().CollectCorruptionInfo();
   EXPECT_NE(std::string::npos, corruption_info.find("SQLITE_CORRUPT"));
   EXPECT_NE(std::string::npos, corruption_info.find("integrity_check"));

   // A statement to see in the results.
   const char* kSimpleSql = "SELECT 'mountain'";
   Statement s(db().GetCachedStatement(SQL_FROM_HERE, kSimpleSql));

   // Error includes the statement.
   const std::string readonly_info = db().CollectErrorInfo(SQLITE_READONLY, &s);
   EXPECT_NE(std::string::npos, readonly_info.find(kSimpleSql));

   // Some other error doesn't include the statment.
   // TODO(shess): This is weak.
   const std::string full_info = db().CollectErrorInfo(SQLITE_FULL, nullptr);
   EXPECT_EQ(std::string::npos, full_info.find(kSimpleSql));

   // A table to see in the SQLITE_ERROR results.
   EXPECT_TRUE(db().Execute("CREATE TABLE volcano (x)"));

   // Version info to see in the SQLITE_ERROR results.
   sql::MetaTable meta_table;
   ASSERT_TRUE(meta_table.Init(&db(), 4, 4));

   const std::string error_info = db().CollectErrorInfo(SQLITE_ERROR, &s);
   EXPECT_NE(std::string::npos, error_info.find(kSimpleSql));
   EXPECT_NE(std::string::npos, error_info.find("volcano"));
   EXPECT_NE(std::string::npos, error_info.find("version: 4"));
 }

 // Test that a fresh database has mmap enabled by default, if mmap'ed I/O is
 // enabled by SQLite.
 TEST_F(SQLDatabaseTest, MmapInitiallyEnabled) {
   {
     sql::Statement s(db().GetUniqueStatement("PRAGMA mmap_size"));
     ASSERT_TRUE(s.Step())
         << "All supported SQLite versions should have mmap support";

     // If mmap I/O is not on, attempt to turn it on.  If that succeeds, then
     // Open() should have turned it on.  If mmap support is disabled, 0 is
     // returned.  If the VFS does not understand SQLITE_FCNTL_MMAP_SIZE (for
     // instance MojoVFS), -1 is returned.
     if (s.ColumnInt(0) <= 0) {
       ASSERT_TRUE(db().Execute("PRAGMA mmap_size = 1048576"));
       s.Reset(true);
       ASSERT_TRUE(s.Step());
       EXPECT_LE(s.ColumnInt(0), 0);
     }
   }

   // Test that explicit disable prevents mmap'ed I/O.
   db().Close();
   sql::Database::Delete(db_path());
   db().set_mmap_disabled();
   ASSERT_TRUE(db().Open(db_path()));
   EXPECT_EQ("0", ExecuteWithResult(&db(), "PRAGMA mmap_size"));
 }

 // Test whether a fresh database gets mmap enabled when using alternate status
 // storage.
 TEST_F(SQLDatabaseTest, MmapInitiallyEnabledAltStatus) {
   // Re-open fresh database with alt-status flag set.
   db().Close();
   sql::Database::Delete(db_path());
   db().set_mmap_alt_status();
   ASSERT_TRUE(db().Open(db_path()));

   {
     sql::Statement s(db().GetUniqueStatement("PRAGMA mmap_size"));
     ASSERT_TRUE(s.Step())
         << "All supported SQLite versions should have mmap support";

     // If mmap I/O is not on, attempt to turn it on.  If that succeeds, then
     // Open() should have turned it on.  If mmap support is disabled, 0 is
     // returned.  If the VFS does not understand SQLITE_FCNTL_MMAP_SIZE (for
     // instance MojoVFS), -1 is returned.
     if (s.ColumnInt(0) <= 0) {
       ASSERT_TRUE(db().Execute("PRAGMA mmap_size = 1048576"));
       s.Reset(true);
       ASSERT_TRUE(s.Step());
       EXPECT_LE(s.ColumnInt(0), 0);
     }
   }

   // Test that explicit disable overrides set_mmap_alt_status().
   db().Close();
   sql::Database::Delete(db_path());
   db().set_mmap_disabled();
   ASSERT_TRUE(db().Open(db_path()));
   EXPECT_EQ("0", ExecuteWithResult(&db(), "PRAGMA mmap_size"));
 }

 TEST_F(SQLDatabaseTest, GetAppropriateMmapSize) {
   const size_t kMmapAlot = 25 * 1024 * 1024;
   int64_t mmap_status = MetaTable::kMmapFailure;

   // If there is no meta table (as for a fresh database), assume that everything
   // should be mapped, and the status of the meta table is not affected.
   ASSERT_TRUE(!db().DoesTableExist("meta"));
   ASSERT_GT(db().GetAppropriateMmapSize(), kMmapAlot);
   ASSERT_TRUE(!db().DoesTableExist("meta"));

   // When the meta table is first created, it sets up to map everything.
   MetaTable().Init(&db(), 1, 1);
   ASSERT_TRUE(db().DoesTableExist("meta"));
   ASSERT_GT(db().GetAppropriateMmapSize(), kMmapAlot);
   ASSERT_TRUE(MetaTable::GetMmapStatus(&db(), &mmap_status));
   ASSERT_EQ(MetaTable::kMmapSuccess, mmap_status);

   // Preload with partial progress of one page.  Should map everything.
   ASSERT_TRUE(db().Execute("REPLACE INTO meta VALUES ('mmap_status', 1)"));
   ASSERT_GT(db().GetAppropriateMmapSize(), kMmapAlot);
   ASSERT_TRUE(MetaTable::GetMmapStatus(&db(), &mmap_status));
   ASSERT_EQ(MetaTable::kMmapSuccess, mmap_status);

   // Failure status maps nothing.
   ASSERT_TRUE(db().Execute("REPLACE INTO meta VALUES ('mmap_status', -2)"));
   ASSERT_EQ(0UL, db().GetAppropriateMmapSize());

   // Re-initializing the meta table does not re-create the key if the table
   // already exists.
   ASSERT_TRUE(db().Execute("DELETE FROM meta WHERE key = 'mmap_status'"));
   MetaTable().Init(&db(), 1, 1);
   ASSERT_EQ(MetaTable::kMmapSuccess, mmap_status);
   ASSERT_TRUE(MetaTable::GetMmapStatus(&db(), &mmap_status));
   ASSERT_EQ(0, mmap_status);

   // With no key, map everything and create the key.
   // TODO(shess): This really should be "maps everything after validating it",
   // but that is more complicated to structure.
   ASSERT_GT(db().GetAppropriateMmapSize(), kMmapAlot);
   ASSERT_TRUE(MetaTable::GetMmapStatus(&db(), &mmap_status));
   ASSERT_EQ(MetaTable::kMmapSuccess, mmap_status);
 }

 TEST_F(SQLDatabaseTest, GetAppropriateMmapSizeAltStatus) {
   const size_t kMmapAlot = 25 * 1024 * 1024;

   // At this point, Database still expects a future [meta] table.
   ASSERT_FALSE(db().DoesTableExist("meta"));
   ASSERT_FALSE(db().DoesViewExist("MmapStatus"));
   ASSERT_GT(db().GetAppropriateMmapSize(), kMmapAlot);
   ASSERT_FALSE(db().DoesTableExist("meta"));
   ASSERT_FALSE(db().DoesViewExist("MmapStatus"));

   // Using alt status, everything should be mapped, with state in the view.
   db().set_mmap_alt_status();
   ASSERT_GT(db().GetAppropriateMmapSize(), kMmapAlot);
   ASSERT_FALSE(db().DoesTableExist("meta"));
   ASSERT_TRUE(db().DoesViewExist("MmapStatus"));
   EXPECT_EQ(base::NumberToString(MetaTable::kMmapSuccess),
             ExecuteWithResult(&db(), "SELECT * FROM MmapStatus"));

   // Also maps everything when kMmapSuccess is already in the view.
   ASSERT_GT(db().GetAppropriateMmapSize(), kMmapAlot);

   // Preload with partial progress of one page.  Should map everything.
   ASSERT_TRUE(db().Execute("DROP VIEW MmapStatus"));
   ASSERT_TRUE(db().Execute("CREATE VIEW MmapStatus (value) AS SELECT 1"));
   ASSERT_GT(db().GetAppropriateMmapSize(), kMmapAlot);
   EXPECT_EQ(base::NumberToString(MetaTable::kMmapSuccess),
             ExecuteWithResult(&db(), "SELECT * FROM MmapStatus"));

   // Failure status leads to nothing being mapped.
   ASSERT_TRUE(db().Execute("DROP VIEW MmapStatus"));
   ASSERT_TRUE(db().Execute("CREATE VIEW MmapStatus (value) AS SELECT -2"));
   ASSERT_EQ(0UL, db().GetAppropriateMmapSize());
   EXPECT_EQ(base::NumberToString(MetaTable::kMmapFailure),
             ExecuteWithResult(&db(), "SELECT * FROM MmapStatus"));
 }

 // To prevent invalid SQL from accidentally shipping to production, prepared
 // statements which fail to compile with SQLITE_ERROR call DLOG(DCHECK).  This
 // case cannot be suppressed with an error callback.
 TEST_F(SQLDatabaseTest, CompileError) {
 // DEATH tests not supported on Android, iOS, or Fuchsia.
 #if !defined(OS_ANDROID) && !defined(OS_IOS) && !defined(OS_FUCHSIA)
   if (DLOG_IS_ON(FATAL)) {
     db().set_error_callback(base::BindRepeating(&IgnoreErrorCallback));
     ASSERT_DEATH({ db().GetUniqueStatement("SELECT x"); },
                  "SQL compile error no such column: x");
   }
 #endif  // !defined(OS_ANDROID) && !defined(OS_IOS) && !defined(OS_FUCHSIA)
 }

 }  // namespace sql