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/*
* Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "SQLiteStatement.h"
#include "Logging.h"
#include "SQLValue.h"
#include <sqlite3.h>
#include <wtf/Assertions.h>
#include <wtf/Variant.h>
#include <wtf/text/StringView.h>
// SQLite 3.6.16 makes sqlite3_prepare_v2 automatically retry preparing the statement
// once if the database scheme has changed. We rely on this behavior.
#if SQLITE_VERSION_NUMBER < 3006016
#error SQLite version 3.6.16 or newer is required
#endif
namespace WebCore {
SQLiteStatement::SQLiteStatement(SQLiteDatabase& db, const String& sql)
: m_database(db)
, m_query(sql)
, m_statement(0)
{
}
SQLiteStatement::~SQLiteStatement()
{
finalize();
}
int SQLiteStatement::prepare()
{
ASSERT(!m_isPrepared);
LockHolder databaseLock(m_database.databaseMutex());
CString query = m_query.stripWhiteSpace().utf8();
LOG(SQLDatabase, "SQL - prepare - %s", query.data());
// Pass the length of the string including the null character to sqlite3_prepare_v2;
// this lets SQLite avoid an extra string copy.
size_t lengthIncludingNullCharacter = query.length() + 1;
const char* tail = nullptr;
int error = sqlite3_prepare_v2(m_database.sqlite3Handle(), query.data(), lengthIncludingNullCharacter, &m_statement, &tail);
if (error != SQLITE_OK)
LOG(SQLDatabase, "sqlite3_prepare16 failed (%i)\n%s\n%s", error, query.data(), sqlite3_errmsg(m_database.sqlite3Handle()));
if (tail && *tail)
error = SQLITE_ERROR;
#if ASSERT_ENABLED
m_isPrepared = error == SQLITE_OK;
#endif
return error;
}
int SQLiteStatement::step()
{
LockHolder databaseLock(m_database.databaseMutex());
if (!m_statement)
return SQLITE_OK;
// The database needs to update its last changes count before each statement
// in order to compute properly the lastChanges() return value.
m_database.updateLastChangesCount();
LOG(SQLDatabase, "SQL - step - %s", m_query.ascii().data());
int error = sqlite3_step(m_statement);
if (error != SQLITE_DONE && error != SQLITE_ROW) {
LOG(SQLDatabase, "sqlite3_step failed (%i)\nQuery - %s\nError - %s",
error, m_query.ascii().data(), sqlite3_errmsg(m_database.sqlite3Handle()));
}
return error;
}
int SQLiteStatement::finalize()
{
#if ASSERT_ENABLED
m_isPrepared = false;
#endif
if (!m_statement)
return SQLITE_OK;
LOG(SQLDatabase, "SQL - finalize - %s", m_query.ascii().data());
int result = sqlite3_finalize(m_statement);
m_statement = 0;
return result;
}
int SQLiteStatement::reset()
{
ASSERT(m_isPrepared);
if (!m_statement)
return SQLITE_OK;
LOG(SQLDatabase, "SQL - reset - %s", m_query.ascii().data());
int status = sqlite3_reset(m_statement);
sqlite3_clear_bindings(m_statement);
return status;
}
bool SQLiteStatement::executeCommand()
{
if (!m_statement && prepare() != SQLITE_OK)
return false;
ASSERT(m_isPrepared);
if (step() != SQLITE_DONE) {
finalize();
return false;
}
finalize();
return true;
}
bool SQLiteStatement::returnsAtLeastOneResult()
{
if (!m_statement && prepare() != SQLITE_OK)
return false;
ASSERT(m_isPrepared);
if (step() != SQLITE_ROW) {
finalize();
return false;
}
finalize();
return true;
}
int SQLiteStatement::bindBlob(int index, const void* blob, int size)
{
ASSERT(m_isPrepared);
ASSERT(index > 0);
ASSERT(static_cast<unsigned>(index) <= bindParameterCount());
ASSERT(blob || !size);
ASSERT(size >= 0);
if (!m_statement)
return SQLITE_ERROR;
return sqlite3_bind_blob(m_statement, index, blob, size, SQLITE_TRANSIENT);
}
int SQLiteStatement::bindBlob(int index, const String& text)
{
// String::characters() returns 0 for the empty string, which SQLite
// treats as a null, so we supply a non-null pointer for that case.
auto upconvertedCharacters = StringView(text).upconvertedCharacters();
UChar anyCharacter = 0;
const UChar* characters;
if (text.isEmpty() && !text.isNull())
characters = &anyCharacter;
else
characters = upconvertedCharacters;
return bindBlob(index, characters, text.length() * sizeof(UChar));
}
int SQLiteStatement::bindText(int index, const String& text)
{
ASSERT(m_isPrepared);
ASSERT(index > 0);
ASSERT(static_cast<unsigned>(index) <= bindParameterCount());
// String::characters() returns 0 for the empty string, which SQLite
// treats as a null, so we supply a non-null pointer for that case.
auto upconvertedCharacters = StringView(text).upconvertedCharacters();
UChar anyCharacter = 0;
const UChar* characters;
if (text.isEmpty() && !text.isNull())
characters = &anyCharacter;
else
characters = upconvertedCharacters;
return sqlite3_bind_text16(m_statement, index, characters, sizeof(UChar) * text.length(), SQLITE_TRANSIENT);
}
int SQLiteStatement::bindInt(int index, int integer)
{
ASSERT(m_isPrepared);
ASSERT(index > 0);
ASSERT(static_cast<unsigned>(index) <= bindParameterCount());
return sqlite3_bind_int(m_statement, index, integer);
}
int SQLiteStatement::bindInt64(int index, int64_t integer)
{
ASSERT(m_isPrepared);
ASSERT(index > 0);
ASSERT(static_cast<unsigned>(index) <= bindParameterCount());
return sqlite3_bind_int64(m_statement, index, integer);
}
int SQLiteStatement::bindDouble(int index, double number)
{
ASSERT(m_isPrepared);
ASSERT(index > 0);
ASSERT(static_cast<unsigned>(index) <= bindParameterCount());
return sqlite3_bind_double(m_statement, index, number);
}
int SQLiteStatement::bindNull(int index)
{
ASSERT(m_isPrepared);
ASSERT(index > 0);
ASSERT(static_cast<unsigned>(index) <= bindParameterCount());
return sqlite3_bind_null(m_statement, index);
}
int SQLiteStatement::bindValue(int index, const SQLValue& value)
{
return WTF::switchOn(value,
[&] (const std::nullptr_t&) { return bindNull(index); },
[&] (const String& string) { return bindText(index, string); },
[&] (double number) { return bindDouble(index, number); }
);
}
unsigned SQLiteStatement::bindParameterCount() const
{
ASSERT(m_isPrepared);
if (!m_statement)
return 0;
return sqlite3_bind_parameter_count(m_statement);
}
int SQLiteStatement::columnCount()
{
ASSERT(m_isPrepared);
if (!m_statement)
return 0;
return sqlite3_data_count(m_statement);
}
bool SQLiteStatement::isColumnNull(int col)
{
ASSERT(col >= 0);
if (!m_statement)
if (prepareAndStep() != SQLITE_ROW)
return false;
if (columnCount() <= col)
return false;
return sqlite3_column_type(m_statement, col) == SQLITE_NULL;
}
bool SQLiteStatement::isColumnDeclaredAsBlob(int col)
{
ASSERT(col >= 0);
if (!m_statement) {
if (prepare() != SQLITE_OK)
return false;
}
return equalLettersIgnoringASCIICase(StringView(sqlite3_column_decltype(m_statement, col)), "blob");
}
String SQLiteStatement::getColumnName(int col)
{
ASSERT(col >= 0);
if (!m_statement)
if (prepareAndStep() != SQLITE_ROW)
return String();
if (columnCount() <= col)
return String();
return String(reinterpret_cast<const UChar*>(sqlite3_column_name16(m_statement, col)));
}
SQLValue SQLiteStatement::getColumnValue(int col)
{
ASSERT(col >= 0);
if (!m_statement)
if (prepareAndStep() != SQLITE_ROW)
return nullptr;
if (columnCount() <= col)
return nullptr;
// SQLite is typed per value. optional column types are
// "(mostly) ignored"
sqlite3_value* value = sqlite3_column_value(m_statement, col);
switch (sqlite3_value_type(value)) {
case SQLITE_INTEGER: // SQLValue and JS don't represent integers, so use FLOAT -case
case SQLITE_FLOAT:
return sqlite3_value_double(value);
case SQLITE_BLOB: // SQLValue and JS don't represent blobs, so use TEXT -case
case SQLITE_TEXT: {
const UChar* string = reinterpret_cast<const UChar*>(sqlite3_value_text16(value));
return StringImpl::create8BitIfPossible(string);
}
case SQLITE_NULL:
return nullptr;
default:
break;
}
ASSERT_NOT_REACHED();
return nullptr;
}
String SQLiteStatement::getColumnText(int col)
{
ASSERT(col >= 0);
if (!m_statement)
if (prepareAndStep() != SQLITE_ROW)
return String();
if (columnCount() <= col)
return String();
return String(reinterpret_cast<const UChar*>(sqlite3_column_text16(m_statement, col)), sqlite3_column_bytes16(m_statement, col) / sizeof(UChar));
}
double SQLiteStatement::getColumnDouble(int col)
{
ASSERT(col >= 0);
if (!m_statement)
if (prepareAndStep() != SQLITE_ROW)
return 0.0;
if (columnCount() <= col)
return 0.0;
return sqlite3_column_double(m_statement, col);
}
int SQLiteStatement::getColumnInt(int col)
{
ASSERT(col >= 0);
if (!m_statement)
if (prepareAndStep() != SQLITE_ROW)
return 0;
if (columnCount() <= col)
return 0;
return sqlite3_column_int(m_statement, col);
}
int64_t SQLiteStatement::getColumnInt64(int col)
{
ASSERT(col >= 0);
if (!m_statement)
if (prepareAndStep() != SQLITE_ROW)
return 0;
if (columnCount() <= col)
return 0;
return sqlite3_column_int64(m_statement, col);
}
String SQLiteStatement::getColumnBlobAsString(int col)
{
ASSERT(col >= 0);
if (!m_statement && prepareAndStep() != SQLITE_ROW)
return String();
if (columnCount() <= col)
return String();
const void* blob = sqlite3_column_blob(m_statement, col);
if (!blob)
return emptyString();
int size = sqlite3_column_bytes(m_statement, col);
if (size < 0)
return String();
ASSERT(!(size % sizeof(UChar)));
return String(static_cast<const UChar*>(blob), size / sizeof(UChar));
}
void SQLiteStatement::getColumnBlobAsVector(int col, Vector<char>& result)
{
ASSERT(col >= 0);
if (!m_statement && prepareAndStep() != SQLITE_ROW) {
result.clear();
return;
}
if (columnCount() <= col) {
result.clear();
return;
}
const void* blob = sqlite3_column_blob(m_statement, col);
if (!blob) {
result.clear();
return;
}
int size = sqlite3_column_bytes(m_statement, col);
result.resize((size_t)size);
for (int i = 0; i < size; ++i)
result[i] = (static_cast<const unsigned char*>(blob))[i];
}
void SQLiteStatement::getColumnBlobAsVector(int col, Vector<uint8_t>& result)
{
ASSERT(col >= 0);
if (!m_statement && prepareAndStep() != SQLITE_ROW) {
result.clear();
return;
}
if (columnCount() <= col) {
result.clear();
return;
}
const void* blob = sqlite3_column_blob(m_statement, col);
if (!blob) {
result.clear();
return;
}
int size = sqlite3_column_bytes(m_statement, col);
result.resize((size_t)size);
for (int i = 0; i < size; ++i)
result[i] = (static_cast<const uint8_t*>(blob))[i];
}
bool SQLiteStatement::returnTextResults(int col, Vector<String>& v)
{
ASSERT(col >= 0);
v.clear();
if (m_statement)
finalize();
if (prepare() != SQLITE_OK)
return false;
while (step() == SQLITE_ROW)
v.append(getColumnText(col));
bool result = true;
if (m_database.lastError() != SQLITE_DONE) {
result = false;
LOG(SQLDatabase, "Error reading results from database query %s", m_query.ascii().data());
}
finalize();
return result;
}
bool SQLiteStatement::returnIntResults(int col, Vector<int>& v)
{
v.clear();
if (m_statement)
finalize();
if (prepare() != SQLITE_OK)
return false;
while (step() == SQLITE_ROW)
v.append(getColumnInt(col));
bool result = true;
if (m_database.lastError() != SQLITE_DONE) {
result = false;
LOG(SQLDatabase, "Error reading results from database query %s", m_query.ascii().data());
}
finalize();
return result;
}
bool SQLiteStatement::returnInt64Results(int col, Vector<int64_t>& v)
{
v.clear();
if (m_statement)
finalize();
if (prepare() != SQLITE_OK)
return false;
while (step() == SQLITE_ROW)
v.append(getColumnInt64(col));
bool result = true;
if (m_database.lastError() != SQLITE_DONE) {
result = false;
LOG(SQLDatabase, "Error reading results from database query %s", m_query.ascii().data());
}
finalize();
return result;
}
bool SQLiteStatement::returnDoubleResults(int col, Vector<double>& v)
{
v.clear();
if (m_statement)
finalize();
if (prepare() != SQLITE_OK)
return false;
while (step() == SQLITE_ROW)
v.append(getColumnDouble(col));
bool result = true;
if (m_database.lastError() != SQLITE_DONE) {
result = false;
LOG(SQLDatabase, "Error reading results from database query %s", m_query.ascii().data());
}
finalize();
return result;
}
bool SQLiteStatement::isExpired()
{
return !m_statement;
}
} // namespace WebCore