Wrap the PostgreSQL JDBC driver to convert the returning column names to lower case

src/main/java/org/postgresql/Driver2.java

@@ -0,0 +1,52 @@
+package org.postgresql;
+
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.Properties;
+
+/**
+ * Wraps the PostgreSQL JDBC driver to convert the returning column names to lower case.
+ */
+public class Driver2 extends Driver {
+
+    @Override
+    public java.sql.Connection connect(String url, Properties info) throws SQLException {
+        Connection conn =  super.connect(url, info);
+
+        Object proxy = Proxy.newProxyInstance(
+                conn.getClass().getClassLoader(),
+                new Class[]{ Connection.class },
+                new ConnectionProxyHandler(conn)
+        );
+
+        return Connection.class.cast(proxy);
+    }
+
+
+    private static class ConnectionProxyHandler implements InvocationHandler {
+
+        private Connection conn;
+
+        public ConnectionProxyHandler(Connection conn){
+            this.conn = conn;
+        }
+
+        @Override
+        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
+            if(method.getName().equals("prepareStatement")){
+                if(args != null && args.length == 2 && args[1].getClass().isArray()){
+                    String[] keys = (String[]) args[1];
+                    for(int i = 0; i < keys.length; i++){
+                        keys[i] = keys[i].toLowerCase();
+                    }
+                }
+            }
+            return method.invoke(conn, args);
+        }
+    }
+
+}
+

src/main/scala/gitbucket/core/util/DatabaseConfig.scala

@@ -70,7 +70,7 @@ object DatabaseType {
   }
 
   object PostgreSQL extends DatabaseType {
-    val jdbcDriver = "org.postgresql.Driver"
+    val jdbcDriver = "org.postgresql.Driver2"
     val slickDriver = new slick.driver.PostgresDriver {
       override def quoteIdentifier(id: String): String = {
         val s = new StringBuilder(id.length + 4) append '"'