Fix error reporting in TDS SQL driver.

The error and message handlers used by the freetds library were getting
reset to back to the default every time a database was opened.  The
Qt TDS SQL driver was calling dbinit() from QTDSDriver::open().  This
had two problems:

1. dbinit() would reset the error handler previously set by a call to
   dberrhandle().  A db error would then cause the application to
   abort.
2. freetds expects dbinit() and dbexit() to be called symmetrically.
   Opening multiple database connections would result in freetds not
   cleaning up on application close.

Solved by moving the dbinit() call into the QTDSDriver constructor.

Backported from Qt5/qtbase change 7456562e7f647e7cb2c854c4272c5599b26dbd37

Change-Id: I43087a44d74de38918c7285a228e2f3d25d070fd
Reviewed-by: Mark Brand <mabrand@mabrand.nl>

1 files changed, 32 insertions, 0 deletions

diff --git a/tests/auto/qsqldatabase/tst_qsqldatabase.cpp b/tests/auto/qsqldatabase/tst_qsqldatabase.cpp
index 6839a64c3f..ff1aeba6ae 100644
--- a/tests/auto/qsqldatabase/tst_qsqldatabase.cpp
+++ b/tests/auto/qsqldatabase/tst_qsqldatabase.cpp
@@ -93,6 +93,8 @@ private slots:
     void eventNotification_data() { generic_data(); }
     void eventNotification();
     void addDatabase();
+    void errorReporting_data();
+    void errorReporting();
 
     //database specific tests
     void recordMySQL_data() { generic_data("QMYSQL"); }
@@ -460,6 +462,36 @@ void tst_QSqlDatabase::addDatabase()
     QVERIFY(!QSqlDatabase::contains("INVALID_CONNECTION"));
 }
 
+void tst_QSqlDatabase::errorReporting_data()
+{
+    QTest::addColumn<QString>("driver");
+
+    QTest::newRow("QTDS") << QString::fromLatin1("QTDS");
+    QTest::newRow("QTDS7") << QString::fromLatin1("QTDS7");
+}
+
+void tst_QSqlDatabase::errorReporting()
+{
+    QFETCH(QString, driver);
+
+    if (!QSqlDatabase::drivers().contains(driver))
+        QSKIP(QString::fromLatin1("Database driver %1 not available").arg(driver).toLocal8Bit().constData(), SkipSingle);
+
+    const QString dbName = QLatin1String("errorReportingDb-") + driver;
+    QSqlDatabase db = QSqlDatabase::addDatabase(driver, dbName);
+
+    db.setHostName(QLatin1String("127.0.0.1"));
+    db.setDatabaseName(QLatin1String("NonExistantDatabase"));
+    db.setUserName(QLatin1String("InvalidUser"));
+    db.setPassword(QLatin1String("IncorrectPassword"));
+
+    QVERIFY(!db.open());
+
+    db = QSqlDatabase();
+
+    QSqlDatabase::removeDatabase(dbName);
+}
+
 void tst_QSqlDatabase::open()
 {
     QFETCH(QString, dbName);