5 files changed, 6 insertions, 5 deletions
diff --git a/src/plugins/sqldrivers/odbc/qsql_odbc_p.h b/src/plugins/sqldrivers/odbc/qsql_odbc_p.h
index ea0aa6fc8b..ccd0206f38 100644
--- a/src/plugins/sqldrivers/odbc/qsql_odbc_p.h
+++ b/src/plugins/sqldrivers/odbc/qsql_odbc_p.h
@@ -89,8 +89,8 @@ class Q_EXPORT_SQLDRIVER_ODBC QODBCDriver : public QSqlDriver
     friend class QODBCResultPrivate;
 
 public:
-    explicit QODBCDriver(QObject *parent=0);
-    QODBCDriver(SQLHANDLE env, SQLHANDLE con, QObject * parent=0);
+    explicit QODBCDriver(QObject *parent=nullptr);
+    QODBCDriver(SQLHANDLE env, SQLHANDLE con, QObject * parent=nullptr);
     virtual ~QODBCDriver();
     bool hasFeature(DriverFeature f) const override;
     void close() override;
diff --git a/src/plugins/sqldrivers/sqlite/qsql_sqlite_p.h b/src/plugins/sqldrivers/sqlite/qsql_sqlite_p.h
index 61be4c937f..c7952bca9a 100644
--- a/src/plugins/sqldrivers/sqlite/qsql_sqlite_p.h
+++ b/src/plugins/sqldrivers/sqlite/qsql_sqlite_p.h
@@ -72,8 +72,8 @@ class Q_EXPORT_SQLDRIVER_SQLITE QSQLiteDriver : public QSqlDriver
     Q_OBJECT
     friend class QSQLiteResultPrivate;
 public:
-    explicit QSQLiteDriver(QObject *parent = 0);
-    explicit QSQLiteDriver(sqlite3 *connection, QObject *parent = 0);
+    explicit QSQLiteDriver(QObject *parent = nullptr);
+    explicit QSQLiteDriver(sqlite3 *connection, QObject *parent = nullptr);
     ~QSQLiteDriver();
     bool hasFeature(DriverFeature f) const override;
     bool open(const QString & db,
diff --git a/src/plugins/sqldrivers/sqlite2/qsql_sqlite2.cpp b/src/plugins/sqldrivers/sqlite2/qsql_sqlite2.cpp
index 390f05c7aa..b7bcd044ab 100644
--- a/src/plugins/sqldrivers/sqlite2/qsql_sqlite2.cpp
+++ b/src/plugins/sqldrivers/sqlite2/qsql_sqlite2.cpp
@@ -43,7 +43,6 @@
 #include <qvariant.h>
 #include <qdatetime.h>
 #include <qfile.h>
-#include <qregexp.h>
 #include <qsqlerror.h>
 #include <qsqlfield.h>
 #include <qsqlindex.h>
diff --git a/src/plugins/sqldrivers/sqlite2/smain.cpp b/src/plugins/sqldrivers/sqlite2/smain.cpp
index 3a5734f8c9..7d971d6e5a 100644
--- a/src/plugins/sqldrivers/sqlite2/smain.cpp
+++ b/src/plugins/sqldrivers/sqlite2/smain.cpp
@@ -43,6 +43,7 @@
 
 QT_BEGIN_NAMESPACE
 
+// ### Qt6: remove, obsolete since 5.14
 class QSQLite2DriverPlugin : public QSqlDriverPlugin
 {
     Q_OBJECT
diff --git a/src/plugins/sqldrivers/tds/main.cpp b/src/plugins/sqldrivers/tds/main.cpp
index 4aa1444608..18efb22ea4 100644
--- a/src/plugins/sqldrivers/tds/main.cpp
+++ b/src/plugins/sqldrivers/tds/main.cpp
@@ -50,6 +50,7 @@
 QT_BEGIN_NAMESPACE
 
 
+// ### Qt6: remove, obsolete since 4.7
 class QTDSDriverPlugin : public QSqlDriverPlugin
 {
     Q_OBJECT