Fix performance when querying icons from database

Make use of the index on icons column by using GLOB
instead of LIKE and handle the escaping ourselves.

Closes #1679

src/lib/other/iconchooser.cpp

@@ -65,9 +65,8 @@ void IconChooser::searchIcon(const QString &string)
     ui->iconList->clear();
 
     QSqlQuery query;
-    query.prepare(QSL("SELECT icon FROM icons WHERE url LIKE ? ESCAPE ? LIMIT 20"));
-    query.bindValue(0, QString(QL1S("%%1%")).arg(QzTools::escapeSqlString(string)));
-    query.bindValue(1, QL1S("!"));
+    query.prepare(QSL("SELECT icon FROM icons WHERE url GLOB ? LIMIT 20"));
+    query.addBindValue(QString(QL1S("*%1*")).arg(QzTools::escapeSqlGlobString(string)));
     query.exec();
 
     while (query.next()) {

src/lib/tools/iconprovider.cpp

@@ -185,10 +185,8 @@ QImage IconProvider::imageForUrl(const QUrl &url, bool allowEmpty)
     }
 
     QSqlQuery query;
-    query.prepare(QSL("SELECT icon FROM icons WHERE url LIKE ? ESCAPE ? LIMIT 1"));
-
-    query.addBindValue(QString("%1%").arg(QzTools::escapeSqlString(QString::fromUtf8(url.toEncoded(QUrl::RemoveFragment)))));
-    query.addBindValue(QL1S("!"));
+    query.prepare(QSL("SELECT icon FROM icons WHERE url GLOB ? LIMIT 1"));
+    query.addBindValue(QString("%1*").arg(QzTools::escapeSqlGlobString(QString::fromUtf8(url.toEncoded(QUrl::RemoveFragment)))));
     SqlDatabase::instance()->exec(query);
 
     if (query.next()) {
@@ -216,10 +214,9 @@ QImage IconProvider::imageForDomain(const QUrl &url, bool allowEmpty)
     }
 
     QSqlQuery query;
-    query.prepare(QSL("SELECT icon FROM icons WHERE url LIKE ? ESCAPE ? LIMIT 1"));
+    query.prepare(QSL("SELECT icon FROM icons WHERE url GLOB ? LIMIT 1"));
 
-    query.addBindValue(QString("%%1%").arg(QzTools::escapeSqlString(url.host())));
-    query.addBindValue(QL1S("!"));
+    query.addBindValue(QString("*%1*").arg(QzTools::escapeSqlGlobString(url.host())));
     query.exec();
 
     if (query.next()) {

src/lib/tools/qztools.cpp

@@ -198,13 +198,13 @@ QString QzTools::fromPunycode(const QString &str)
     return decoded.left(decoded.size() - 4);
 }
 
-QString QzTools::escapeSqlString(QString urlString)
+QString QzTools::escapeSqlGlobString(QString urlString)
 {
-    const static QString &escapeString = QL1S("!");
-    urlString.replace(escapeString, escapeString + escapeString);
-    urlString.replace(QL1S("_"), escapeString + QL1S("_"));
-    urlString.replace(QL1S("%"), escapeString + QL1S("%"));
-
+    urlString.replace(QL1C('['), QStringLiteral("[["));
+    urlString.replace(QL1C(']'), QStringLiteral("[]]"));
+    urlString.replace(QStringLiteral("[["), QStringLiteral("[[]"));
+    urlString.replace(QL1C('*'), QStringLiteral("[*]"));
+    urlString.replace(QL1C('?'), QStringLiteral("[?]"));
     return urlString;
 }
 

src/lib/tools/qztools.h

@@ -48,7 +48,7 @@ public:
     static QString samePartOfStrings(const QString &one, const QString &other);
     static QString urlEncodeQueryString(const QUrl &url);
     static QString fromPunycode(const QString &str);
-    static QString escapeSqlString(QString urlString);
+    static QString escapeSqlGlobString(QString urlString);
 
     static QString ensureUniqueFilename(const QString &name, const QString &appendFormat = QString("(%1)"));
     static QString getFileNameFromUrl(const QUrl &url);

tests/autotests/qztoolstest.cpp

@@ -134,6 +134,33 @@ void QzToolsTest::splitCommandArguments()
     QCOMPARE(QzTools::splitCommandArguments(command), result);
 }
 
+void QzToolsTest::escapeSqlGlobString_data()
+{
+    QTest::addColumn<QString>("input");
+    QTest::addColumn<QString>("result");
+
+    QTest::newRow("NothingToEscape") << "http://test" << "http://test";
+    QTest::newRow("Escape *") << "http://test*/heh" << "http://test[*]/heh";
+    QTest::newRow("Escape **") << "http://test**/he*h" << "http://test[*][*]/he[*]h";
+    QTest::newRow("Escape ?") << "http://test?/heh" << "http://test[?]/heh";
+    QTest::newRow("Escape ??") << "http://t??est?/heh" << "http://t[?][?]est[?]/heh";
+    QTest::newRow("Escape [") << "http://[test/heh" << "http://[[]test/heh";
+    QTest::newRow("Escape [[") << "http://[[te[st/heh" << "http://[[][[]te[[]st/heh";
+    QTest::newRow("Escape ]") << "http://]test/heh" << "http://[]]test/heh";
+    QTest::newRow("Escape ]]") << "http://]]te]st/heh" << "http://[]][]]te[]]st/heh";
+    QTest::newRow("Escape []") << "http://[]test/heh" << "http://[[][]]test/heh";
+    QTest::newRow("Escape [][[]][]") << "http://t[][[]][]est/heh" << "http://t[[][]][[][[][]][]][[][]]est/heh";
+    QTest::newRow("Escape [?]][[*]") << "http://t[?]][[*]est/heh" << "http://t[[][?][]][]][[][[][*][]]est/heh";
+}
+
+void QzToolsTest::escapeSqlGlobString()
+{
+    QFETCH(QString, input);
+    QFETCH(QString, result);
+
+    QCOMPARE(QzTools::escapeSqlGlobString(input), result);
+}
+
 class TempFile
 {
     QString name;

tests/autotests/qztoolstest.h

@@ -37,6 +37,9 @@ private slots:
     void splitCommandArguments_data();
     void splitCommandArguments();
 
+    void escapeSqlGlobString_data();
+    void escapeSqlGlobString();
+
     void ensureUniqueFilename();
 
 private: