Ensure that QSqlDatabase::database() is still thread-safe

QSqlDatabase::database() is documented to be thread-safe and when the
driver is queried for the numericalPrecisionPolicy set then it can
comprimise the thread-safety.

Since the driver itself (if one is set) will be queried for the
numericalPrecisionPolicy when numericalPrecisionPolicy() is called on
the QSqlDatabase then we can have it fallback to the default instead
rather than taking the driver's own setting.

Task-number: QTBUG-13423

1 files changed, 1 insertions, 4 deletions

diff --git a/src/sql/kernel/qsqldatabase.cpp b/src/sql/kernel/qsqldatabase.cpp
index db5124c..4bf3558 100644
--- a/src/sql/kernel/qsqldatabase.cpp
+++ b/src/sql/kernel/qsqldatabase.cpp
@@ -138,10 +138,7 @@ public:
         port(-1)
     {
         ref = 1;
-        if(driver)
-            precisionPolicy = driver->numericalPrecisionPolicy();
-        else
-            precisionPolicy= QSql::LowPrecisionDouble;
+        precisionPolicy= QSql::LowPrecisionDouble;
     }
     QSqlDatabasePrivate(const QSqlDatabasePrivate &other);
     ~QSqlDatabasePrivate();