From a5b50a5bd4ca8b0de8ca8032aeaca0b383163bc9 Mon Sep 17 00:00:00 2001
From: Mark Struberg <struberg@apache.org>
Date: Wed, 3 Apr 2019 00:21:02 +0200
Subject: [PATCH] OPENJPA-2784 add docs for sub-second fractions in MariaDB and
 MySQL

---
 .../src/doc/manual/supported_databases.xml    | 31 +++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/openjpa-project/src/doc/manual/supported_databases.xml b/openjpa-project/src/doc/manual/supported_databases.xml
index a4e8dad3d..d194276ee 100644
--- a/openjpa-project/src/doc/manual/supported_databases.xml
+++ b/openjpa-project/src/doc/manual/supported_databases.xml
@@ -1176,6 +1176,37 @@ When reading LOB data from the database, the MySQL JDBC driver will actually
 load all the data into memory at the same time.
                     </para>
                 </listitem>
+                <listitem>
+                    <para>
+As of MySQL 5.7 the <code>DATETIME</code> data type supports sub-second fractions.
+The default of MySQL is to use no fractions.
+The number of fractions can be explicitly set via scale:
+<code>@Column(scale=3)</code> will lead to a <code>DATETIME(3)</code> column.
+                    </para>
+                </listitem>
+
+            </itemizedlist>
+        </section>
+    </section>
+
+    <section id="dbsupport_mariadb">
+        <title>
+            MariaDB
+        </title>
+        <section id="dbsupport_mariadb_issues">
+            <title>
+                Known issues with MariaDB
+            </title>
+            <itemizedlist>
+                <listitem>
+                    <para>
+                        As of MariaDB 10.2 the <code>DATETIME</code> data type supports sub-second fractions.
+                        The default of MariaDB is to use no fractions.
+                        The number of fractions can be explicitly set via scale:
+                        <code>@Column(scale=3)</code> will lead to a <code>DATETIME(3)</code> column.
+                    </para>
+                </listitem>
+
             </itemizedlist>
         </section>
     </section>