Move migration code out of WebDatabase and into table-specific classes.

chrome/browser/webdata/autofill_table.cc

Index: chrome/browser/webdata/autofill_table.cc
diff --git a/chrome/browser/webdata/autofill_table.cc b/chrome/browser/webdata/autofill_table.cc
index 33e048372e5aacee55c1df8a5ec9381adcbb3366..e8bd0e4f99941433bb850be4b596179fc77f922f 100644
--- a/chrome/browser/webdata/autofill_table.cc
+++ b/chrome/browser/webdata/autofill_table.cc
@@ -4,7 +4,16 @@
 
 #include "chrome/browser/webdata/autofill_table.h"
 
+#include <algorithm>
+#include <limits>
+#include <map>
+#include <set>
+#include <string>
+#include <vector>
+
 #include "app/sql/statement.h"
+#include "base/logging.h"
+#include "base/string_number_conversions.h"
 #include "base/time.h"
 #include "base/tuple.h"
 #include "chrome/browser/autofill/autofill_country.h"
@@ -12,8 +21,8 @@
 #include "chrome/browser/autofill/autofill_type.h"
 #include "chrome/browser/autofill/credit_card.h"
 #include "chrome/browser/autofill/personal_data_manager.h"
+#include "chrome/browser/password_manager/encryptor.h"
 #include "chrome/browser/webdata/autofill_change.h"
-#include "chrome/browser/webdata/autofill_util.h"
 #include "chrome/common/guid.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "webkit/glue/form_field.h"
@@ -22,7 +31,360 @@ using base::Time;
 using webkit_glue::FormField;
 
 namespace {
+
+// Constants for the |autofill_profile_phones| |type| column.
+enum AutofillPhoneType {
+  kAutofillPhoneNumber = 0,
+  kAutofillFaxNumber = 1
+};
+
 typedef std::vector<Tuple3<int64, string16, string16> > AutofillElementList;
+
+// TODO(dhollowa): Find a common place for this.  It is duplicated in
+// personal_data_manager.cc.
+template<typename T>
+T* address_of(T& v) {
+  return &v;
+}
+
+// The maximum length allowed for form data.
+const size_t kMaxDataLength = 1024;
+
+string16 LimitDataSize(const string16& data) {
+  if (data.size() > kMaxDataLength)
+    return data.substr(0, kMaxDataLength);
+
+  return data;
+}
+
+void BindAutofillProfileToStatement(const AutofillProfile& profile,
+                                    sql::Statement* s) {
+  DCHECK(guid::IsValidGUID(profile.guid()));
+  s->BindString(0, profile.guid());
+
+  string16 text = profile.GetInfo(COMPANY_NAME);
+  s->BindString16(1, LimitDataSize(text));
+  text = profile.GetInfo(ADDRESS_HOME_LINE1);
+  s->BindString16(2, LimitDataSize(text));
+  text = profile.GetInfo(ADDRESS_HOME_LINE2);
+  s->BindString16(3, LimitDataSize(text));
+  text = profile.GetInfo(ADDRESS_HOME_CITY);
+  s->BindString16(4, LimitDataSize(text));
+  text = profile.GetInfo(ADDRESS_HOME_STATE);
+  s->BindString16(5, LimitDataSize(text));
+  text = profile.GetInfo(ADDRESS_HOME_ZIP);
+  s->BindString16(6, LimitDataSize(text));
+  text = profile.GetInfo(ADDRESS_HOME_COUNTRY);
+  s->BindString16(7, LimitDataSize(text));
+  std::string country_code = profile.CountryCode();
+  s->BindString(8, country_code);
+  s->BindInt64(9, Time::Now().ToTimeT());
+}
+
+AutofillProfile* AutofillProfileFromStatement(const sql::Statement& s) {
+  AutofillProfile* profile = new AutofillProfile;
+  profile->set_guid(s.ColumnString(0));
+  DCHECK(guid::IsValidGUID(profile->guid()));
+
+  profile->SetInfo(COMPANY_NAME, s.ColumnString16(1));
+  profile->SetInfo(ADDRESS_HOME_LINE1, s.ColumnString16(2));
+  profile->SetInfo(ADDRESS_HOME_LINE2, s.ColumnString16(3));
+  profile->SetInfo(ADDRESS_HOME_CITY, s.ColumnString16(4));
+  profile->SetInfo(ADDRESS_HOME_STATE, s.ColumnString16(5));
+  profile->SetInfo(ADDRESS_HOME_ZIP, s.ColumnString16(6));
+  // Intentionally skip column 7, which stores the localized country name.
+  profile->SetCountryCode(s.ColumnString(8));
+  // Intentionally skip column 9, which stores the profile's modification date.
+
+  return profile;
+}
+
+void BindCreditCardToStatement(const CreditCard& credit_card,
+                               sql::Statement* s) {
+  DCHECK(guid::IsValidGUID(credit_card.guid()));
+  s->BindString(0, credit_card.guid());
+
+  string16 text = credit_card.GetInfo(CREDIT_CARD_NAME);
+  s->BindString16(1, LimitDataSize(text));
+  text = credit_card.GetInfo(CREDIT_CARD_EXP_MONTH);
+  s->BindString16(2, LimitDataSize(text));
+  text = credit_card.GetInfo(CREDIT_CARD_EXP_4_DIGIT_YEAR);
+  s->BindString16(3, LimitDataSize(text));
+  text = credit_card.GetInfo(CREDIT_CARD_NUMBER);
+  std::string encrypted_data;
+  Encryptor::EncryptString16(text, &encrypted_data);
+  s->BindBlob(4, encrypted_data.data(),
+              static_cast<int>(encrypted_data.length()));
+  s->BindInt64(5, Time::Now().ToTimeT());
+}
+
+CreditCard* CreditCardFromStatement(const sql::Statement& s) {
+  CreditCard* credit_card = new CreditCard;
+
+  credit_card->set_guid(s.ColumnString(0));
+  DCHECK(guid::IsValidGUID(credit_card->guid()));
+
+  credit_card->SetInfo(CREDIT_CARD_NAME, s.ColumnString16(1));
+  credit_card->SetInfo(CREDIT_CARD_EXP_MONTH,
+                       s.ColumnString16(2));
+  credit_card->SetInfo(CREDIT_CARD_EXP_4_DIGIT_YEAR,
+                       s.ColumnString16(3));
+  int encrypted_number_len = s.ColumnByteLength(4);
+  string16 credit_card_number;
+  if (encrypted_number_len) {
+    std::string encrypted_number;
+    encrypted_number.resize(encrypted_number_len);
+    memcpy(&encrypted_number[0], s.ColumnBlob(4), encrypted_number_len);
+    Encryptor::DecryptString16(encrypted_number, &credit_card_number);
+  }
+  credit_card->SetInfo(CREDIT_CARD_NUMBER, credit_card_number);
+  // Intentionally skip column 5, which stores the modification date.
+
+  return credit_card;
+}
+
+bool AddAutofillProfileNamesToProfile(sql::Connection* db,
+                                      AutofillProfile* profile) {
+  sql::Statement s(db->GetUniqueStatement(
+      "SELECT guid, first_name, middle_name, last_name "
+      "FROM autofill_profile_names "
+      "WHERE guid=?"));
+  if (!s) {
+    NOTREACHED() << "Statement prepare failed";
+    return false;
+  }
+  s.BindString(0, profile->guid());
+
+  std::vector<string16> first_names;
+  std::vector<string16> middle_names;
+  std::vector<string16> last_names;
+  while (s.Step()) {
+    DCHECK_EQ(profile->guid(), s.ColumnString(0));
+    first_names.push_back(s.ColumnString16(1));
+    middle_names.push_back(s.ColumnString16(2));
+    last_names.push_back(s.ColumnString16(3));
+  }
+  profile->SetMultiInfo(NAME_FIRST, first_names);
+  profile->SetMultiInfo(NAME_MIDDLE, middle_names);
+  profile->SetMultiInfo(NAME_LAST, last_names);
+  return true;
+}
+
+bool AddAutofillProfileEmailsToProfile(sql::Connection* db,
+                                       AutofillProfile* profile) {
+  sql::Statement s(db->GetUniqueStatement(
+      "SELECT guid, email "
+      "FROM autofill_profile_emails "
+      "WHERE guid=?"));
+  if (!s) {
+    NOTREACHED() << "Statement prepare failed";
+    return false;
+  }
+  s.BindString(0, profile->guid());
+
+  std::vector<string16> emails;
+  while (s.Step()) {
+    DCHECK_EQ(profile->guid(), s.ColumnString(0));
+    emails.push_back(s.ColumnString16(1));
+  }
+  profile->SetMultiInfo(EMAIL_ADDRESS, emails);
+  return true;
+}
+
+bool AddAutofillProfilePhonesToProfile(sql::Connection* db,
+                                       AutofillProfile* profile) {
+  sql::Statement s(db->GetUniqueStatement(
+      "SELECT guid, type, number "
+      "FROM autofill_profile_phones "
+      "WHERE guid=? AND type=?"));
+  if (!s) {
+    NOTREACHED() << "Statement prepare failed";
+    return false;
+  }
+  s.BindString(0, profile->guid());
+  s.BindInt(1, kAutofillPhoneNumber);
+
+  std::vector<string16> numbers;
+  while (s.Step()) {
+    DCHECK_EQ(profile->guid(), s.ColumnString(0));
+    numbers.push_back(s.ColumnString16(2));
+  }
+  profile->SetMultiInfo(PHONE_HOME_WHOLE_NUMBER, numbers);
+  return true;
+}
+
+bool AddAutofillProfileFaxesToProfile(sql::Connection* db,
+                                      AutofillProfile* profile) {
+  sql::Statement s(db->GetUniqueStatement(
+      "SELECT guid, type, number "
+      "FROM autofill_profile_phones "
+      "WHERE guid=? AND type=?"));
+  if (!s) {
+    NOTREACHED() << "Statement prepare failed";
+    return false;
+  }
+  s.BindString(0, profile->guid());
+  s.BindInt(1, kAutofillFaxNumber);
+
+  std::vector<string16> numbers;
+  while (s.Step()) {
+    DCHECK_EQ(profile->guid(), s.ColumnString(0));
+    numbers.push_back(s.ColumnString16(2));
+  }
+  profile->SetMultiInfo(PHONE_FAX_WHOLE_NUMBER, numbers);
+  return true;
+}
+
+
+bool AddAutofillProfileNames(const AutofillProfile& profile,
+                             sql::Connection* db) {
+  std::vector<string16> first_names;
+  profile.GetMultiInfo(NAME_FIRST, &first_names);
+  std::vector<string16> middle_names;
+  profile.GetMultiInfo(NAME_MIDDLE, &middle_names);
+  std::vector<string16> last_names;
+  profile.GetMultiInfo(NAME_LAST, &last_names);
+  DCHECK_EQ(first_names.size(), middle_names.size());
+  DCHECK_EQ(middle_names.size(), last_names.size());
+
+  for (size_t i = 0; i < first_names.size(); ++i) {
+    // Add the new name.
+    sql::Statement s(db->GetUniqueStatement(
+      "INSERT INTO autofill_profile_names"
+      " (guid, first_name, middle_name, last_name) "
+      "VALUES (?,?,?,?)"));
+    if (!s) {
+      NOTREACHED();
+      return false;
+    }
+    s.BindString(0, profile.guid());
+    s.BindString16(1, first_names[i]);
+    s.BindString16(2, middle_names[i]);
+    s.BindString16(3, last_names[i]);
+
+    if (!s.Run()) {
+      NOTREACHED();
+      return false;
+    }
+  }
+  return true;
+}
+
+bool AddAutofillProfileEmails(const AutofillProfile& profile,
+                              sql::Connection* db) {
+  std::vector<string16> emails;
+  profile.GetMultiInfo(EMAIL_ADDRESS, &emails);
+
+  for (size_t i = 0; i < emails.size(); ++i) {
+    // Add the new email.
+    sql::Statement s(db->GetUniqueStatement(
+      "INSERT INTO autofill_profile_emails"
+      " (guid, email) "
+      "VALUES (?,?)"));
+    if (!s) {
+      NOTREACHED();
+      return false;
+    }
+    s.BindString(0, profile.guid());
+    s.BindString16(1, emails[i]);
+
+    if (!s.Run()) {
+      NOTREACHED();
+      return false;
+    }
+  }
+  return true;
+}
+
+bool AddAutofillProfilePhones(const AutofillProfile& profile,
+                              AutofillPhoneType phone_type,
+                              sql::Connection* db) {
+  AutofillFieldType field_type;
+  if (phone_type == kAutofillPhoneNumber) {
+    field_type = PHONE_HOME_WHOLE_NUMBER;
+  } else if (phone_type == kAutofillFaxNumber) {
+    field_type = PHONE_FAX_WHOLE_NUMBER;
+  } else {
+    NOTREACHED();
+    return false;
+  }
+
+  std::vector<string16> numbers;
+  profile.GetMultiInfo(field_type, &numbers);
+
+  for (size_t i = 0; i < numbers.size(); ++i) {
+    // Add the new number.
+    sql::Statement s(db->GetUniqueStatement(
+      "INSERT INTO autofill_profile_phones"
+      " (guid, type, number) "
+      "VALUES (?,?,?)"));
+    if (!s) {
+      NOTREACHED();
+      return false;
+    }
+    s.BindString(0, profile.guid());
+    s.BindInt(1, phone_type);
+    s.BindString16(2, numbers[i]);
+
+    if (!s.Run()) {
+      NOTREACHED();
+      return false;
+    }
+  }
+  return true;
+}
+
+bool AddAutofillProfilePieces(const AutofillProfile& profile,
+                              sql::Connection* db) {
+  if (!AddAutofillProfileNames(profile, db))
+    return false;
+
+  if (!AddAutofillProfileEmails(profile, db))
+    return false;
+
+  if (!AddAutofillProfilePhones(profile, kAutofillPhoneNumber, db))
+    return false;
+
+  if (!AddAutofillProfilePhones(profile, kAutofillFaxNumber, db))
+    return false;
+
+  return true;
+}
+
+bool RemoveAutofillProfilePieces(const std::string& guid, sql::Connection* db) {
+  sql::Statement s1(db->GetUniqueStatement(
+      "DELETE FROM autofill_profile_names WHERE guid = ?"));
+  if (!s1) {
+    NOTREACHED() << "Statement prepare failed";
+    return false;
+  }
+
+  s1.BindString(0, guid);
+  if (!s1.Run())
+    return false;
+
+  sql::Statement s2(db->GetUniqueStatement(
+      "DELETE FROM autofill_profile_emails WHERE guid = ?"));
+  if (!s2) {
+    NOTREACHED() << "Statement prepare failed";
+    return false;
+  }
+
+  s2.BindString(0, guid);
+  if (!s2.Run())
+    return false;
+
+  sql::Statement s3(db->GetUniqueStatement(
+      "DELETE FROM autofill_profile_phones WHERE guid = ?"));
+  if (!s3) {
+    NOTREACHED() << "Statement prepare failed";
+    return false;
+  }
+
+  s3.BindString(0, guid);
+  return s3.Run();
+}
+
 }  // anonymous namespace

[dhollowa, 2011/04/04 16:13:20]

nit: s/anonymous namespace/namespace/

[Bons, 2011/04/05 11:05:13]

Done.

 
 bool AutofillTable::Init() {
@@ -537,7 +899,7 @@ bool AutofillTable::AddAutofillProfile(const AutofillProfile& profile) {
     return false;
   }
 
-  autofill_util::BindAutofillProfileToStatement(profile, &s);
+  BindAutofillProfileToStatement(profile, &s);
 
   if (!s.Run()) {
     NOTREACHED();
@@ -547,7 +909,7 @@ bool AutofillTable::AddAutofillProfile(const AutofillProfile& profile) {
   if (!s.Succeeded())
     return false;
 
-  return autofill_util::AddAutofillProfilePieces(profile, db_);
+  return AddAutofillProfilePieces(profile, db_);
 }
 
 bool AutofillTable::GetAutofillProfile(const std::string& guid,
@@ -571,19 +933,19 @@ bool AutofillTable::GetAutofillProfile(const std::string& guid,
   if (!s.Succeeded())
     return false;
 
-  scoped_ptr<AutofillProfile> p(autofill_util::AutofillProfileFromStatement(s));
+  scoped_ptr<AutofillProfile> p(AutofillProfileFromStatement(s));
 
   // Get associated name info.
-  autofill_util::AddAutofillProfileNamesToProfile(db_, p.get());
+  AddAutofillProfileNamesToProfile(db_, p.get());
 
   // Get associated email info.
-  autofill_util::AddAutofillProfileEmailsToProfile(db_, p.get());
+  AddAutofillProfileEmailsToProfile(db_, p.get());
 
   // Get associated phone info.
-  autofill_util::AddAutofillProfilePhonesToProfile(db_, p.get());
+  AddAutofillProfilePhonesToProfile(db_, p.get());
 
   // Get associated fax info.
-  autofill_util::AddAutofillProfileFaxesToProfile(db_, p.get());
+  AddAutofillProfileFaxesToProfile(db_, p.get());
 
   *profile = p.release();
   return true;
@@ -680,7 +1042,7 @@ bool AutofillTable::UpdateAutofillProfileMulti(const AutofillProfile& profile) {
     return false;
   }
 
-  autofill_util::BindAutofillProfileToStatement(profile, &s);
+  BindAutofillProfileToStatement(profile, &s);
   s.BindString(10, profile.guid());
   bool result = s.Run();
   DCHECK_GT(db_->GetLastChangeCount(), 0);
@@ -688,10 +1050,10 @@ bool AutofillTable::UpdateAutofillProfileMulti(const AutofillProfile& profile) {
     return result;
 
   // Remove the old names, emails, and phone/fax numbers.
-  if (!autofill_util::RemoveAutofillProfilePieces(profile.guid(), db_))
+  if (!RemoveAutofillProfilePieces(profile.guid(), db_))
     return false;
 
-  return autofill_util::AddAutofillProfilePieces(profile, db_);
+  return AddAutofillProfilePieces(profile, db_);
 }
 
 bool AutofillTable::RemoveAutofillProfile(const std::string& guid) {
@@ -724,7 +1086,7 @@ bool AutofillTable::RemoveAutofillProfile(const std::string& guid) {
   if (!s.Run())
     return false;
 
-  return autofill_util::RemoveAutofillProfilePieces(guid, db_);
+  return RemoveAutofillProfilePieces(guid, db_);
 }
 
 bool AutofillTable::ClearAutofillProfiles() {
@@ -782,7 +1144,7 @@ bool AutofillTable::AddCreditCard(const CreditCard& credit_card) {
     return false;
   }
 
-  autofill_util::BindCreditCardToStatement(credit_card, &s);
+  BindCreditCardToStatement(credit_card, &s);
 
   if (!s.Run()) {
     NOTREACHED();
@@ -810,7 +1172,7 @@ bool AutofillTable::GetCreditCard(const std::string& guid,
   if (!s.Step())
     return false;
 
-  *credit_card = autofill_util::CreditCardFromStatement(s);
+  *credit_card = CreditCardFromStatement(s);
 
   return s.Succeeded();
 }
@@ -861,7 +1223,7 @@ bool AutofillTable::UpdateCreditCard(const CreditCard& credit_card) {
     return false;
   }
 
-  autofill_util::BindCreditCardToStatement(credit_card, &s);
+  BindCreditCardToStatement(credit_card, &s);
   s.BindString(6, credit_card.guid());
   bool result = s.Run();
   DCHECK_GT(db_->GetLastChangeCount(), 0);
@@ -1148,3 +1510,620 @@ bool AutofillTable::InitProfileTrashTable() {
   }
   return true;
 }
+
+bool AutofillTable::AddCardNumberEncryptedColumnForVersion23() {
+  // Add the card_number_encrypted column if credit card table was not

[dhollowa, 2011/04/04 16:13:20]

This comment block now describes the migration method.  Feels like it should be
pulled up above the function definition.  Same with the others.

[Bons, 2011/04/05 11:05:13]

Done.

+  // created in this build (otherwise the column already exists).
+  // WARNING: Do not change the order of the execution of the SQL
+  // statements in this case!  Profile corruption and data migration
+  // issues WILL OCCUR. See http://crbug.com/10913
+  //
+  // The problem is that if a user has a profile which was created before
+  // r37036, when the credit_cards table was added, and then failed to
+  // update this profile between the credit card addition and the addition
+  // of the "encrypted" columns (44963), the next data migration will put
+  // the user's profile in an incoherent state: The user will update from
+  // a data profile set to be earlier than 22, and therefore pass through
+  // this update case.  But because the user did not have a credit_cards
+  // table before starting Chrome, it will have just been initialized
+  // above, and so already have these columns -- and thus this data
+  // update step will have failed.
+  //
+  // The false assumption in this case is that at this step in the
+  // migration, the user has a credit card table, and that this
+  // table does not include encrypted columns!
+  // Because this case does not roll back the complete set of SQL
+  // transactions properly in case of failure (that is, it does not
+  // roll back the table initialization done above), the incoherent
+  // profile will now see itself as being at version 22 -- but include a
+  // fully initialized credit_cards table.  Every time Chrome runs, it
+  // will try to update the web database and fail at this step, unless
+  // we allow for the faulty assumption described above by checking for
+  // the existence of the columns only AFTER we've executed the commands
+  // to add them.
+  if (!db_->DoesColumnExist("credit_cards", "card_number_encrypted")) {
+    if (!db_->Execute("ALTER TABLE credit_cards ADD COLUMN "
+                      "card_number_encrypted BLOB DEFAULT NULL")) {
+      LOG(WARNING) << "Could not add card_number_encrypted to "
+                      "credit_cards table.";
+      return false;
+    }
+  }
+
+  if (!db_->DoesColumnExist("credit_cards", "verification_code_encrypted")) {
+    if (!db_->Execute("ALTER TABLE credit_cards ADD COLUMN "
+                      "verification_code_encrypted BLOB DEFAULT NULL")) {
+      LOG(WARNING) << "Could not add verification_code_encrypted to "
+                      "credit_cards table.";
+      return false;
+    }
+  }
+
+  return true;
+}
+
+bool AutofillTable::CleanupOversizedStringFieldsForVersion24() {
+  // One-time cleanup for http://crbug.com/38364 - In the presence of
+  // multi-byte UTF-8 characters, that bug could cause Autofill strings
+  // to grow larger and more corrupt with each save.  The cleanup removes
+  // any row with a string field larger than a reasonable size.  The string
+  // fields examined here are precisely the ones that were subject to
+  // corruption by the original bug.
+  const std::string autofill_is_too_big =
+      "max(length(name), length(value)) > 500";
+
+  const std::string credit_cards_is_too_big =
+      "max(length(label), length(name_on_card), length(type), "
+      "    length(expiration_month), length(expiration_year), "
+      "    length(billing_address), length(shipping_address) "
+      ") > 500";
+
+  const std::string autofill_profiles_is_too_big =
+      "max(length(label), length(first_name), "
+      "    length(middle_name), length(last_name), length(email), "
+      "    length(company_name), length(address_line_1), "
+      "    length(address_line_2), length(city), length(state), "
+      "    length(zipcode), length(country), length(phone), "
+      "    length(fax)) > 500";
+
+  std::string query = "DELETE FROM autofill_dates WHERE pair_id IN ("
+      "SELECT pair_id FROM autofill WHERE " + autofill_is_too_big + ")";
+
+  if (!db_->Execute(query.c_str()))
+    return false;
+
+  query = "DELETE FROM autofill WHERE " + autofill_is_too_big;
+
+  if (!db_->Execute(query.c_str()))
+    return false;
+
+  // Only delete from legacy credit card tables where specific columns exist.
+  if (db_->DoesColumnExist("credit_cards", "label") &&
+      db_->DoesColumnExist("credit_cards", "name_on_card") &&
+      db_->DoesColumnExist("credit_cards", "type") &&
+      db_->DoesColumnExist("credit_cards", "expiration_month") &&
+      db_->DoesColumnExist("credit_cards", "expiration_year") &&
+      db_->DoesColumnExist("credit_cards", "billing_address") &&
+      db_->DoesColumnExist("credit_cards", "shipping_address") &&
+      db_->DoesColumnExist("autofill_profiles", "label")) {
+    query = "DELETE FROM credit_cards WHERE (" + credit_cards_is_too_big +
+        ") OR label IN (SELECT label FROM autofill_profiles WHERE " +
+        autofill_profiles_is_too_big + ")";
+
+    if (!db_->Execute(query.c_str()))
+      return false;
+  }
+
+  if (db_->DoesColumnExist("autofill_profiles", "label")) {
+    query = "DELETE FROM autofill_profiles WHERE " +
+        autofill_profiles_is_too_big;
+
+    if (!db_->Execute(query.c_str()))
+      return false;
+  }
+
+  return true;
+}
+
+bool AutofillTable::UpdateLegacyCreditCardsForVersion27() {
+  // Only migrate from legacy credit card tables where specific columns
+  // exist.
+  if (!(db_->DoesColumnExist("credit_cards", "unique_id") &&
+        db_->DoesColumnExist("credit_cards", "billing_address") &&
+        db_->DoesColumnExist("autofill_profiles", "unique_id"))) {
+    return true;
+  }
+
+  // Change the credit_cards.billing_address column from a string to an
+  // int.  The stored string is the label of an address, so we have to
+  // select the unique ID of this address using the label as a foreign
+  // key into the |autofill_profiles| table.
+  std::string stmt =
+      "SELECT credit_cards.unique_id, autofill_profiles.unique_id "
+      "FROM autofill_profiles, credit_cards "
+      "WHERE credit_cards.billing_address = autofill_profiles.label";
+  sql::Statement s(db_->GetUniqueStatement(stmt.c_str()));
+  if (!s)
+    return false;
+
+  std::map<int, int> cc_billing_map;
+  while (s.Step())
+    cc_billing_map[s.ColumnInt(0)] = s.ColumnInt(1);
+
+  // Windows already stores the IDs as strings in |billing_address|. Try
+  // to convert those.
+  if (cc_billing_map.empty()) {
+    std::string stmt = "SELECT unique_id,billing_address FROM credit_cards";
+    sql::Statement s(db_->GetUniqueStatement(stmt.c_str()));
+    if (!s)
+      return false;
+
+    while (s.Step()) {
+      int id = 0;
+      if (base::StringToInt(s.ColumnString(1), &id))
+        cc_billing_map[s.ColumnInt(0)] = id;
+    }
+  }
+
+  if (!db_->Execute("CREATE TABLE credit_cards_temp ( "
+                    "label VARCHAR, "
+                    "unique_id INTEGER PRIMARY KEY, "
+                    "name_on_card VARCHAR, "
+                    "type VARCHAR, "
+                    "card_number VARCHAR, "
+                    "expiration_month INTEGER, "
+                    "expiration_year INTEGER, "
+                    "verification_code VARCHAR, "
+                    "billing_address INTEGER, "
+                    "shipping_address VARCHAR, "
+                    "card_number_encrypted BLOB, "
+                    "verification_code_encrypted BLOB)")) {
+    return false;
+  }
+
+  if (!db_->Execute(
+      "INSERT INTO credit_cards_temp "
+      "SELECT label,unique_id,name_on_card,type,card_number,"
+      "expiration_month,expiration_year,verification_code,0,"
+      "shipping_address,card_number_encrypted,"
+      "verification_code_encrypted FROM credit_cards")) {
+    return false;
+  }
+
+  if (!db_->Execute("DROP TABLE credit_cards"))
+    return false;
+
+  if (!db_->Execute("ALTER TABLE credit_cards_temp RENAME TO credit_cards"))
+    return false;
+
+  for (std::map<int, int>::const_iterator iter = cc_billing_map.begin();
+       iter != cc_billing_map.end(); ++iter) {
+    sql::Statement s(db_->GetCachedStatement(
+        SQL_FROM_HERE,
+        "UPDATE credit_cards SET billing_address=? WHERE unique_id=?"));
+    if (!s)
+      return false;
+
+    s.BindInt(0, (*iter).second);
+    s.BindInt(1, (*iter).first);
+
+    if (!s.Run())
+      return false;
+  }
+
+  return true;
+}
+
+bool AutofillTable::AddDateModifedForVersion30() {
+  // Add date_modified to autofill_profiles.
+  if (!db_->DoesColumnExist("autofill_profiles", "date_modified")) {
+    if (!db_->Execute("ALTER TABLE autofill_profiles ADD COLUMN "
+                      "date_modified INTEGER NON NULL DEFAULT 0")) {
+      return false;
+    }
+
+    sql::Statement s(db_->GetUniqueStatement(
+        "UPDATE autofill_profiles SET date_modified=?"));
+    if (!s)
+      return false;
+
+    s.BindInt64(0, Time::Now().ToTimeT());
+
+    if (!s.Run())
+      return false;
+  }
+
+  // Add date_modified to credit_cards.
+  if (!db_->DoesColumnExist("credit_cards", "date_modified")) {
+    if (!db_->Execute("ALTER TABLE credit_cards ADD COLUMN "
+                      "date_modified INTEGER NON NULL DEFAULT 0")) {
+      return false;
+    }
+
+    sql::Statement s(db_->GetUniqueStatement(
+        "UPDATE credit_cards SET date_modified=?"));
+    if (!s)
+      return false;
+
+    s.BindInt64(0, Time::Now().ToTimeT());
+
+    if (!s.Run())
+      return false;
+  }
+
+  return true;
+}
+
+bool AutofillTable::AddGUIDToCreditCardsAndProfilesForVersion31() {
+  // Add |guid| column to |autofill_profiles| table.
+  // Note that we need to check for the guid column's existence due to the
+  // fact that for a version 22 database the |autofill_profiles| table
+  // gets created fresh with |InitAutofillProfilesTable|.
+  if (!db_->DoesColumnExist("autofill_profiles", "guid")) {
+    if (!db_->Execute("ALTER TABLE autofill_profiles ADD COLUMN "
+                      "guid VARCHAR NOT NULL DEFAULT \"\"")) {
+      return false;
+    }
+
+    // Set all the |guid| fields to valid values.
+
+    sql::Statement s(db_->GetUniqueStatement("SELECT unique_id "
+                                             "FROM autofill_profiles"));
+    if (!s)
+      return false;
+
+    while (s.Step()) {
+      sql::Statement update_s(
+          db_->GetUniqueStatement("UPDATE autofill_profiles "
+                                  "SET guid=? WHERE unique_id=?"));
+      if (!update_s)
+        return false;
+      update_s.BindString(0, guid::GenerateGUID());
+      update_s.BindInt(1, s.ColumnInt(0));
+
+      if (!update_s.Run())
+        return false;
+    }
+  }
+
+  // Add |guid| column to |credit_cards| table.
+  // Note that we need to check for the guid column's existence due to the
+  // fact that for a version 22 database the |autofill_profiles| table
+  // gets created fresh with |InitAutofillProfilesTable|.
+  if (!db_->DoesColumnExist("credit_cards", "guid")) {
+    if (!db_->Execute("ALTER TABLE credit_cards ADD COLUMN "
+                      "guid VARCHAR NOT NULL DEFAULT \"\"")) {
+      return false;
+    }
+
+    // Set all the |guid| fields to valid values.
+
+    sql::Statement s(db_->GetUniqueStatement("SELECT unique_id "
+                                             "FROM credit_cards"));
+    if (!s)
+      return false;
+
+    while (s.Step()) {
+      sql::Statement update_s(
+          db_->GetUniqueStatement("UPDATE credit_cards "
+                                  "set guid=? WHERE unique_id=?"));
+      if (!update_s)
+        return false;
+      update_s.BindString(0, guid::GenerateGUID());
+      update_s.BindInt(1, s.ColumnInt(0));
+
+      if (!update_s.Run())
+        return false;
+    }
+  }
+
+  return true;
+}
+
+bool AutofillTable::UpdateProfilesAndCreditCardsForVersion32() {
+  if (db_->DoesColumnExist("autofill_profiles", "unique_id")) {
+    if (!db_->Execute("CREATE TABLE autofill_profiles_temp ( "
+                      "guid VARCHAR PRIMARY KEY, "
+                      "label VARCHAR, "
+                      "first_name VARCHAR, "
+                      "middle_name VARCHAR, "
+                      "last_name VARCHAR, "
+                      "email VARCHAR, "
+                      "company_name VARCHAR, "
+                      "address_line_1 VARCHAR, "
+                      "address_line_2 VARCHAR, "
+                      "city VARCHAR, "
+                      "state VARCHAR, "
+                      "zipcode VARCHAR, "
+                      "country VARCHAR, "
+                      "phone VARCHAR, "
+                      "fax VARCHAR, "
+                      "date_modified INTEGER NOT NULL DEFAULT 0)")) {
+      return false;
+    }
+
+    if (!db_->Execute(
+        "INSERT INTO autofill_profiles_temp "
+        "SELECT guid, label, first_name, middle_name, last_name, email, "
+        "company_name, address_line_1, address_line_2, city, state, "
+        "zipcode, country, phone, fax, date_modified "
+        "FROM autofill_profiles")) {
+      return false;
+    }
+
+    if (!db_->Execute("DROP TABLE autofill_profiles"))
+      return false;
+
+    if (!db_->Execute(
+        "ALTER TABLE autofill_profiles_temp RENAME TO autofill_profiles")) {
+      return false;
+    }
+  }
+
+  if (db_->DoesColumnExist("credit_cards", "unique_id")) {
+    if (!db_->Execute("CREATE TABLE credit_cards_temp ( "
+                      "guid VARCHAR PRIMARY KEY, "
+                      "label VARCHAR, "
+                      "name_on_card VARCHAR, "
+                      "expiration_month INTEGER, "
+                      "expiration_year INTEGER, "
+                      "card_number_encrypted BLOB, "
+                      "date_modified INTEGER NOT NULL DEFAULT 0)")) {
+      return false;
+    }
+
+    if (!db_->Execute(
+        "INSERT INTO credit_cards_temp "
+        "SELECT guid, label, name_on_card, expiration_month, "
+        "expiration_year, card_number_encrypted, date_modified "
+        "FROM credit_cards")) {
+      return false;
+    }
+
+    if (!db_->Execute("DROP TABLE credit_cards"))
+      return false;
+
+    if (!db_->Execute("ALTER TABLE credit_cards_temp RENAME TO credit_cards"))
+      return false;
+  }
+
+  return true;
+}
+
+bool AutofillTable::UpdateProfilesBasedOnFirstNameForVersion33() {
+  // Test the existence of the |first_name| column as an indication that
+  // we need a migration.  It is possible that the new |autofill_profiles|
+  // schema is in place because the table was newly created when migrating
+  // from a pre-version-22 database.
+  if (db_->DoesColumnExist("autofill_profiles", "first_name")) {
+    // Create autofill_profiles_temp table that will receive the data.
+    if (!db_->DoesTableExist("autofill_profiles_temp")) {
+      if (!db_->Execute("CREATE TABLE autofill_profiles_temp ( "
+                        "guid VARCHAR PRIMARY KEY, "
+                        "company_name VARCHAR, "
+                        "address_line_1 VARCHAR, "
+                        "address_line_2 VARCHAR, "
+                        "city VARCHAR, "
+                        "state VARCHAR, "
+                        "zipcode VARCHAR, "
+                        "country VARCHAR, "
+                        "date_modified INTEGER NOT NULL DEFAULT 0)")) {
+        return false;
+      }
+    }
+
+    sql::Statement s(db_->GetUniqueStatement(
+        "SELECT guid, first_name, middle_name, last_name, email, "
+        "company_name, address_line_1, address_line_2, city, state, "
+        "zipcode, country, phone, fax, date_modified "
+        "FROM autofill_profiles"));
+    while (s.Step()) {
+      AutofillProfile profile;
+      profile.set_guid(s.ColumnString(0));
+      DCHECK(guid::IsValidGUID(profile.guid()));
+
+      profile.SetInfo(NAME_FIRST, s.ColumnString16(1));
+      profile.SetInfo(NAME_MIDDLE, s.ColumnString16(2));
+      profile.SetInfo(NAME_LAST, s.ColumnString16(3));
+      profile.SetInfo(EMAIL_ADDRESS, s.ColumnString16(4));
+      profile.SetInfo(COMPANY_NAME, s.ColumnString16(5));
+      profile.SetInfo(ADDRESS_HOME_LINE1, s.ColumnString16(6));
+      profile.SetInfo(ADDRESS_HOME_LINE2, s.ColumnString16(7));
+      profile.SetInfo(ADDRESS_HOME_CITY, s.ColumnString16(8));
+      profile.SetInfo(ADDRESS_HOME_STATE, s.ColumnString16(9));
+      profile.SetInfo(ADDRESS_HOME_ZIP, s.ColumnString16(10));
+      profile.SetInfo(ADDRESS_HOME_COUNTRY, s.ColumnString16(11));
+      profile.SetInfo(PHONE_HOME_WHOLE_NUMBER, s.ColumnString16(12));
+      profile.SetInfo(PHONE_FAX_WHOLE_NUMBER, s.ColumnString16(13));
+      int64 date_modified = s.ColumnInt64(14);
+
+      sql::Statement s_insert(db_->GetUniqueStatement(
+          "INSERT INTO autofill_profiles_temp"
+          "(guid, company_name, address_line_1, address_line_2, city,"
+          " state, zipcode, country, date_modified)"
+          "VALUES (?,?,?,?,?,?,?,?,?)"));
+      if (!s)
+        return false;
+
+      s_insert.BindString(0, profile.guid());
+      s_insert.BindString16(1, profile.GetInfo(COMPANY_NAME));
+      s_insert.BindString16(2, profile.GetInfo(ADDRESS_HOME_LINE1));
+      s_insert.BindString16(3, profile.GetInfo(ADDRESS_HOME_LINE2));
+      s_insert.BindString16(4, profile.GetInfo(ADDRESS_HOME_CITY));
+      s_insert.BindString16(5, profile.GetInfo(ADDRESS_HOME_STATE));
+      s_insert.BindString16(6, profile.GetInfo(ADDRESS_HOME_ZIP));
+      s_insert.BindString16(7, profile.GetInfo(ADDRESS_HOME_COUNTRY));
+      s_insert.BindInt64(8, date_modified);
+
+      if (!s_insert.Run())
+        return false;
+
+      // Add the other bits: names, emails, and phone/fax.
+      if (!AddAutofillProfilePieces(profile, db_))
+        return false;
+    }
+
+    if (!db_->Execute("DROP TABLE autofill_profiles"))
+      return false;
+
+    if (!db_->Execute(
+        "ALTER TABLE autofill_profiles_temp RENAME TO autofill_profiles")) {
+      return false;
+    }
+  }
+
+  // Remove the labels column from the credit_cards table.
+  if (db_->DoesColumnExist("credit_cards", "label")) {
+    if (!db_->Execute("CREATE TABLE credit_cards_temp ( "
+                      "guid VARCHAR PRIMARY KEY, "
+                      "name_on_card VARCHAR, "
+                      "expiration_month INTEGER, "
+                      "expiration_year INTEGER, "
+                      "card_number_encrypted BLOB, "
+                      "date_modified INTEGER NOT NULL DEFAULT 0)")) {
+      return false;
+    }
+
+    if (!db_->Execute(
+        "INSERT INTO credit_cards_temp "
+        "SELECT guid, name_on_card, expiration_month, "
+        "expiration_year, card_number_encrypted, date_modified "
+        "FROM credit_cards")) {
+      return false;
+    }
+
+    if (!db_->Execute("DROP TABLE credit_cards"))
+      return false;
+
+    if (!db_->Execute("ALTER TABLE credit_cards_temp RENAME TO credit_cards"))
+      return false;
+  }
+
+  return true;
+}
+
+bool AutofillTable::UpdatesProfilesBasedOnCountryCodeForVersion34() {
+  // Test the existence of the |country_code| column as an indication that
+  // we need a migration.  It is possible that the new |autofill_profiles|
+  // schema is in place because the table was newly created when migrating
+  // from a pre-version-22 database.
+  if (!db_->DoesColumnExist("autofill_profiles", "country_code")) {
+    if (!db_->Execute("ALTER TABLE autofill_profiles ADD COLUMN "
+                      "country_code VARCHAR")) {
+      return false;
+    }
+
+    // Set all the |country_code| fields to match existing |country| values.
+    sql::Statement s(db_->GetUniqueStatement("SELECT guid, country "
+                                             "FROM autofill_profiles"));
+
+    if (!s)
+      return false;
+
+    while (s.Step()) {
+      sql::Statement update_s(
+          db_->GetUniqueStatement("UPDATE autofill_profiles "
+                                  "SET country_code=? WHERE guid=?"));
+      if (!update_s)
+        return false;
+
+      string16 country = s.ColumnString16(1);
+      std::string app_locale = AutofillCountry::ApplicationLocale();
+      update_s.BindString(0, AutofillCountry::GetCountryCode(country,
+                                                             app_locale));
+      update_s.BindString(1, s.ColumnString(0));
+
+      if (!update_s.Run())
+        return false;
+    }
+  }
+
+  return true;
+}
+
+bool AutofillTable::CorrectGreatBritainCountryCodesForVersion35() {
+  // Correct all country codes with value "UK" to be "GB".  This data
+  // was mistakenly introduced in build 686.0.  This migration is to clean
+  // it up.  See http://crbug.com/74511 for details.
+  sql::Statement s(db_->GetUniqueStatement(
+      "UPDATE autofill_profiles SET country_code=\"GB\" "
+      "WHERE country_code=\"UK\""));
+
+  return s.Run();
+}
+
+bool AutofillTable::MergeAndCullOlderProfilesForVersion36() {
+  // Merge and cull older profiles where possible.
+  sql::Statement s(db_->GetUniqueStatement(
+      "SELECT guid, date_modified FROM autofill_profiles"));
+  if (!s)
+    return false;
+
+  // Accumulate the good profiles.
+  std::vector<AutofillProfile> accumulated_profiles;
+  std::vector<AutofillProfile*> accumulated_profiles_p;
+  std::map<std::string, int64> modification_map;
+  while (s.Step()) {
+    std::string guid = s.ColumnString(0);
+    int64 date_modified = s.ColumnInt64(1);
+    modification_map.insert(
+        std::pair<std::string, int64>(guid, date_modified));
+    AutofillProfile* profile = NULL;
+    if (!GetAutofillProfile(guid, &profile))
+      return false;
+
+    scoped_ptr<AutofillProfile> p(profile);
+
+    if (PersonalDataManager::IsValidLearnableProfile(*p)) {
+      std::vector<AutofillProfile> merged_profiles;
+      bool merged = PersonalDataManager::MergeProfile(
+          *p, accumulated_profiles_p, &merged_profiles);
+
+      std::swap(accumulated_profiles, merged_profiles);
+
+      accumulated_profiles_p.clear();
+      accumulated_profiles_p.resize(accumulated_profiles.size());
+      std::transform(accumulated_profiles.begin(),
+                     accumulated_profiles.end(),
+                     accumulated_profiles_p.begin(),
+                     address_of<AutofillProfile>);
+
+      // If the profile got merged trash the original.
+      if (merged)
+        AddAutofillGUIDToTrash(p->guid());
+
+    } else {
+      // An invalid profile, so trash it.
+      AddAutofillGUIDToTrash(p->guid());
+    }
+  }
+
+  // Drop the current profiles.
+  if (!ClearAutofillProfiles())
+    return false;
+
+  // Add the newly merged profiles back in.
+  for (std::vector<AutofillProfile>::const_iterator
+          iter = accumulated_profiles.begin();
+       iter != accumulated_profiles.end();
+       ++iter) {
+    if (!AddAutofillProfile(*iter))
+      return false;
+
+    // Fix up the original modification date.
+    std::map<std::string, int64>::const_iterator date_item =
+        modification_map.find(iter->guid());
+    if (date_item == modification_map.end())
+      return false;
+
+    sql::Statement s_date(db_->GetUniqueStatement(
+        "UPDATE autofill_profiles SET date_modified=? "
+        "WHERE guid=?"));
+    s_date.BindInt64(0, date_item->second);
+    s_date.BindString(1, iter->guid());
+    if (!s_date.Run())
+      return false;
+  }
+
+  return true;
+}