diff options
author | Lorenz Haas <lorenz.haas@histomatics.de> | 2016-11-19 19:05:36 +0100 |
---|---|---|
committer | Lorenz Haas <lorenz.haas@histomatics.de> | 2017-02-22 21:14:23 +0000 |
commit | 2a3297c7269c9a3a9e6b4129c76366bac5c9d7cb (patch) | |
tree | 779de134a974c24f448fe1dcc5102f46981575da /src | |
parent | 56723c6e913498b96c0c814611c46bfcbd262e67 (diff) |
REGEXP for SQLite
Since SQLite does not define a regexp function by default, provide a Qt
based implementation which can be enabled using QSQLITE_ENABLE_REGEXP as
an connect option. This way statements like
SELECT * FROM table WHERE col REGEXP '^[a-d]';
work out of the box.
[ChangeLog][QtSql] Add QSQLITE_ENABLE_REGEXP connect option for
QSQLiteDriver. If set a Qt based regexp() implementation is provided
allowing to use REGEXP in SQL statements.
Task-number: QTBUG-18084
Change-Id: I7f0e926fe4c5d6baea509f75497f46a61ca86679
Reviewed-by: Milian Wolff <milian.wolff@kdab.com>
Reviewed-by: Jesus Fernandez <Jesus.Fernandez@qt.io>
Reviewed-by: Sebastian Sauer <sebastian.sauer@kdab.com>
Reviewed-by: Andy Shaw <andy.shaw@qt.io>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@qt.io>
Diffstat (limited to 'src')
-rw-r--r-- | src/plugins/sqldrivers/sqlite/qsql_sqlite.cpp | 63 | ||||
-rw-r--r-- | src/sql/doc/snippets/code/doc_src_sql-driver.cpp | 5 | ||||
-rw-r--r-- | src/sql/doc/src/sql-driver.qdoc | 16 | ||||
-rw-r--r-- | src/sql/kernel/qsqldatabase.cpp | 1 |
4 files changed, 85 insertions, 0 deletions
diff --git a/src/plugins/sqldrivers/sqlite/qsql_sqlite.cpp b/src/plugins/sqldrivers/sqlite/qsql_sqlite.cpp index 1cb0f10494..56eceeecbd 100644 --- a/src/plugins/sqldrivers/sqlite/qsql_sqlite.cpp +++ b/src/plugins/sqldrivers/sqlite/qsql_sqlite.cpp @@ -51,6 +51,10 @@ #include <qstringlist.h> #include <qvector.h> #include <qdebug.h> +#ifndef QT_NO_REGULAREXPRESSION +#include <qcache.h> +#include <qregularexpression.h> +#endif #if defined Q_OS_WIN # include <qt_windows.h> @@ -556,6 +560,37 @@ QVariant QSQLiteResult::handle() const ///////////////////////////////////////////////////////// +#ifndef QT_NO_REGULAREXPRESSION +static void _q_regexp(sqlite3_context* context, int argc, sqlite3_value** argv) +{ + if (Q_UNLIKELY(argc != 2)) { + sqlite3_result_int(context, 0); + return; + } + + const QString pattern = QString::fromUtf8( + reinterpret_cast<const char*>(sqlite3_value_text(argv[0]))); + const QString subject = QString::fromUtf8( + reinterpret_cast<const char*>(sqlite3_value_text(argv[1]))); + + auto cache = static_cast<QCache<QString, QRegularExpression>*>(sqlite3_user_data(context)); + QRegularExpression *regexp = cache->object(pattern); + if (!regexp) { + regexp = new QRegularExpression(pattern, QRegularExpression::DontCaptureOption + | QRegularExpression::OptimizeOnFirstUsageOption); + cache->insert(pattern, regexp); + } + const bool found = subject.contains(*regexp); + + sqlite3_result_int(context, int(found)); +} + +static void _q_regexp_cleanup(void *cache) +{ + delete static_cast<QCache<QString, QRegularExpression>*>(cache); +} +#endif + QSQLiteDriver::QSQLiteDriver(QObject * parent) : QSqlDriver(*new QSQLiteDriverPrivate, parent) { @@ -615,6 +650,11 @@ bool QSQLiteDriver::open(const QString & db, const QString &, const QString &, c bool sharedCache = false; bool openReadOnlyOption = false; bool openUriOption = false; +#ifndef QT_NO_REGULAREXPRESSION + static const QLatin1String regexpConnectOption = QLatin1String("QSQLITE_ENABLE_REGEXP"); + bool defineRegexp = false; + int regexpCacheSize = 25; +#endif const auto opts = conOpts.splitRef(QLatin1Char(';')); for (auto option : opts) { @@ -634,6 +674,22 @@ bool QSQLiteDriver::open(const QString & db, const QString &, const QString &, c } else if (option == QLatin1String("QSQLITE_ENABLE_SHARED_CACHE")) { sharedCache = true; } +#ifndef QT_NO_REGULAREXPRESSION + else if (option.startsWith(regexpConnectOption)) { + option = option.mid(regexpConnectOption.size()).trimmed(); + if (option.isEmpty()) { + defineRegexp = true; + } else if (option.startsWith(QLatin1Char('='))) { + bool ok = false; + const int cacheSize = option.mid(1).trimmed().toInt(&ok); + if (ok) { + defineRegexp = true; + if (cacheSize > 0) + regexpCacheSize = cacheSize; + } + } + } +#endif } int openMode = (openReadOnlyOption ? SQLITE_OPEN_READONLY : (SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE)); @@ -646,6 +702,13 @@ bool QSQLiteDriver::open(const QString & db, const QString &, const QString &, c sqlite3_busy_timeout(d->access, timeOut); setOpen(true); setOpenError(false); +#ifndef QT_NO_REGULAREXPRESSION + if (defineRegexp) { + auto cache = new QCache<QString, QRegularExpression>(regexpCacheSize); + sqlite3_create_function_v2(d->access, "regexp", 2, SQLITE_UTF8, cache, &_q_regexp, NULL, + NULL, &_q_regexp_cleanup); + } +#endif return true; } else { if (d->access) { diff --git a/src/sql/doc/snippets/code/doc_src_sql-driver.cpp b/src/sql/doc/snippets/code/doc_src_sql-driver.cpp index f25ad4f2b0..7983386642 100644 --- a/src/sql/doc/snippets/code/doc_src_sql-driver.cpp +++ b/src/sql/doc/snippets/code/doc_src_sql-driver.cpp @@ -90,3 +90,8 @@ qDebug() << q.value(0); // outputs the first RETURN/OUT value QSqlDatabase: QMYSQL driver not loaded QSqlDatabase: available drivers: QMYSQL //! [31] + + +//! [34] +column.contains(QRegularExpression("pattern")); +//! [34] diff --git a/src/sql/doc/src/sql-driver.qdoc b/src/sql/doc/src/sql-driver.qdoc index 364d733e92..57a53006c4 100644 --- a/src/sql/doc/src/sql-driver.qdoc +++ b/src/sql/doc/src/sql-driver.qdoc @@ -568,6 +568,22 @@ \snippet code/doc_src_sql-driver.qdoc 23 + \section3 Enable REGEXP operator + + SQLite comes with a REGEXP operation. However the needed implementation must + be provided by the user. For convenience a default implementation can be + enabled by \l{QSqlDatabase::setConnectOptions()} {setting the connect + option} \c{QSQLITE_ENABLE_REGEXP} before \l{QSqlDatabase::open()} {the + database connection is opened}. Then a SQL statement like "column REGEXP + 'pattern'" basically expands to the Qt code + + \snippet code/doc_src_sql-driver.cpp 34 + + For better performance the regular expressions are cached internally. By + default the cache size is 25, but it can be changed through the option's + value. For example passing "\c{QSQLITE_ENABLE_REGEXP=10}" reduces the + cache size to 10. + \section3 QSQLITE File Format Compatibility SQLite minor releases sometimes break file format forward compatibility. diff --git a/src/sql/kernel/qsqldatabase.cpp b/src/sql/kernel/qsqldatabase.cpp index 0416215870..eb3a3c444d 100644 --- a/src/sql/kernel/qsqldatabase.cpp +++ b/src/sql/kernel/qsqldatabase.cpp @@ -1175,6 +1175,7 @@ QSqlRecord QSqlDatabase::record(const QString& tablename) const \li QSQLITE_OPEN_READONLY \li QSQLITE_OPEN_URI \li QSQLITE_ENABLE_SHARED_CACHE + \li QSQLITE_ENABLE_REGEXP \endlist \li |