sql/transaction_unittest.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/file_util.h"
   6 #include "base/scoped_temp_dir.h"
   7 #include "sql/connection.h"
   8 #include "sql/statement.h"
   9 #include "sql/transaction.h"
  10 #include "testing/gtest/include/gtest/gtest.h"
  11 #include "third_party/sqlite/sqlite3.h"
  12
  13 class SQLTransactionTest : public testing::Test {
  14  public:
  15   SQLTransactionTest() {}
  16
  17   void SetUp() {
  18     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
  19     ASSERT_TRUE(db_.Open(
  20         temp_dir_.path().AppendASCII("SQLTransactionTest.db")));
  21
  22     ASSERT_TRUE(db().Execute("CREATE TABLE foo (a, b)"));
  23   }
  24
  25   void TearDown() {
  26     db_.Close();
  27   }
  28
  29   sql::Connection& db() { return db_; }
  30
  31   // Returns the number of rows in table "foo".
  32   int CountFoo() {
  33     sql::Statement count(db().GetUniqueStatement("SELECT count(*) FROM foo"));
  34     count.Step();
  35     return count.ColumnInt(0);
  36   }
  37
  38  private:
  39   ScopedTempDir temp_dir_;
  40   sql::Connection db_;
  41 };
  42
  43 TEST_F(SQLTransactionTest, Commit) {
  44   {
  45     sql::Transaction t(&db());
  46     EXPECT_FALSE(t.is_open());
  47     EXPECT_TRUE(t.Begin());
  48     EXPECT_TRUE(t.is_open());
  49
  50     EXPECT_TRUE(db().Execute("INSERT INTO foo (a, b) VALUES (1, 2)"));
  51
  52     t.Commit();
  53     EXPECT_FALSE(t.is_open());
  54   }
  55
  56   EXPECT_EQ(1, CountFoo());
  57 }
  58
  59 TEST_F(SQLTransactionTest, Rollback) {
  60   // Test some basic initialization, and that rollback runs when you exit the
  61   // scope.
  62   {
  63     sql::Transaction t(&db());
  64     EXPECT_FALSE(t.is_open());
  65     EXPECT_TRUE(t.Begin());
  66     EXPECT_TRUE(t.is_open());
  67
  68     EXPECT_TRUE(db().Execute("INSERT INTO foo (a, b) VALUES (1, 2)"));
  69   }
  70
  71   // Nothing should have been committed since it was implicitly rolled back.
  72   EXPECT_EQ(0, CountFoo());
  73
  74   // Test explicit rollback.
  75   sql::Transaction t2(&db());
  76   EXPECT_FALSE(t2.is_open());
  77   EXPECT_TRUE(t2.Begin());
  78
  79   EXPECT_TRUE(db().Execute("INSERT INTO foo (a, b) VALUES (1, 2)"));
  80   t2.Rollback();
  81   EXPECT_FALSE(t2.is_open());
  82
  83   // Nothing should have been committed since it was explicitly rolled back.
  84   EXPECT_EQ(0, CountFoo());
  85 }
  86
  87 // Rolling back any part of a transaction should roll back all of them.
  88 TEST_F(SQLTransactionTest, NestedRollback) {
  89   EXPECT_EQ(0, db().transaction_nesting());
  90
  91   // Outermost transaction.
  92   {
  93     sql::Transaction outer(&db());
  94     EXPECT_TRUE(outer.Begin());
  95     EXPECT_EQ(1, db().transaction_nesting());
  96
  97     // The first inner one gets committed.
  98     {
  99       sql::Transaction inner1(&db());
 100       EXPECT_TRUE(inner1.Begin());
 101       EXPECT_TRUE(db().Execute("INSERT INTO foo (a, b) VALUES (1, 2)"));
 102       EXPECT_EQ(2, db().transaction_nesting());
 103
 104       inner1.Commit();
 105       EXPECT_EQ(1, db().transaction_nesting());
 106     }
 107
 108     // One row should have gotten inserted.
 109     EXPECT_EQ(1, CountFoo());
 110
 111     // The second inner one gets rolled back.
 112     {
 113       sql::Transaction inner2(&db());
 114       EXPECT_TRUE(inner2.Begin());
 115       EXPECT_TRUE(db().Execute("INSERT INTO foo (a, b) VALUES (1, 2)"));
 116       EXPECT_EQ(2, db().transaction_nesting());
 117
 118       inner2.Rollback();
 119       EXPECT_EQ(1, db().transaction_nesting());
 120     }
 121
 122     // A third inner one will fail in Begin since one has already been rolled
 123     // back.
 124     EXPECT_EQ(1, db().transaction_nesting());
 125     {
 126       sql::Transaction inner3(&db());
 127       EXPECT_FALSE(inner3.Begin());
 128       EXPECT_EQ(1, db().transaction_nesting());
 129     }
 130   }
 131   EXPECT_EQ(0, db().transaction_nesting());
 132   EXPECT_EQ(0, CountFoo());
 133 }