Fixes the Oracle nchar bug when NLS_CHARSET is different with NLS_NCHAR_CHARSET.

If Oracle national char types use different charset(NLS_NCHAR_CHARSET) with
the database charset (NLS_CHARSET), the oci client need to set OCI_ATTR_CHARSET_FORM
to SQLCS_NCHAR instead of SQLCS_IMPLICIT.

Task-number: QTBUG-10919
Reviewed-by: Michael Goddard

1 files changed, 33 insertions, 1 deletions

diff --git a/src/sql/drivers/oci/qsql_oci.cpp b/src/sql/drivers/oci/qsql_oci.cpp
index c56b995..e11cf75 100644
--- a/src/sql/drivers/oci/qsql_oci.cpp
+++ b/src/sql/drivers/oci/qsql_oci.cpp
@@ -93,8 +93,17 @@ enum { QOCIEncoding = 2002 }; // AL16UTF16LE
 enum { QOCIEncoding = 2000 }; // AL16UTF16
 #endif
 
-static const ub1 CSID_NCHAR = SQLCS_NCHAR;
+// Always set the OCI_ATTR_CHARSET_FORM to SQLCS_NCHAR is safe
+// because Oracle server will deal with the implicit Conversion
+// Between CHAR and NCHAR.
+// see: http://download.oracle.com/docs/cd/A91202_01/901_doc/appdev.901/a89857/oci05bnd.htm#422705 
+static const ub1 qOraCharsetForm = SQLCS_NCHAR;
+
+#if defined (OCI_UTF16ID)
+static const ub2 qOraCharset = OCI_UTF16ID;
+#else
 static const ub2 qOraCharset = OCI_UCS2ID;
+#endif
 
 typedef QVarLengthArray<sb2, 32> IndicatorArray;
 typedef QVarLengthArray<ub2, 32> SizeArray;
@@ -209,12 +218,24 @@ void QOCIResultPrivate::setCharset(OCIBind* hbnd)
                    OCI_HTYPE_BIND,
                    // this const cast is safe since OCI doesn't touch
                    // the charset.
+                   const_cast<void *>(static_cast<const void *>(&qOraCharsetForm)),
+                   0,
+                   OCI_ATTR_CHARSET_FORM,
+                   err);
+    if (r != 0)
+        qOraWarning("QOCIResultPrivate::setCharset: Couldn't set OCI_ATTR_CHARSET_FORM: ", err);
+
+    r = OCIAttrSet(hbnd,
+                   OCI_HTYPE_BIND,
+                   // this const cast is safe since OCI doesn't touch
+                   // the charset.
                    const_cast<void *>(static_cast<const void *>(&qOraCharset)),
                    0,
                    OCI_ATTR_CHARSET_ID,
                    err);
     if (r != 0)
         qOraWarning("QOCIResultPrivate::setCharset: Couldn't set OCI_ATTR_CHARSET_ID: ", err);
+
 }
 
 int QOCIResultPrivate::bindValue(OCIStmt *sql, OCIBind **hbnd, OCIError *err, int pos,
@@ -939,6 +960,17 @@ void QOCICols::setCharset(OCIDefine* dfn)
                    OCI_HTYPE_DEFINE,
                    // this const cast is safe since OCI doesn't touch
                    // the charset.
+                   const_cast<void *>(static_cast<const void *>(&qOraCharsetForm)),
+                   0,
+                   OCI_ATTR_CHARSET_FORM,
+                   d->err);
+    if (r != 0)
+        qOraWarning("QOCIResultPrivate::setCharset: Couldn't set OCI_ATTR_CHARSET_FORM: ", d->err);
+
+    r = OCIAttrSet(dfn,
+                   OCI_HTYPE_DEFINE,
+                   // this const cast is safe since OCI doesn't touch
+                   // the charset.
                    const_cast<void *>(static_cast<const void *>(&qOraCharset)),
                    0,
                    OCI_ATTR_CHARSET_ID,