Fix prepared statement metadata cache issue

src/main/java/com/microsoft/sqlserver/jdbc/SQLServerConnection.java

@@ -83,6 +83,9 @@
 
 // Note all the public functions in this class also need to be defined in SQLServerConnectionPoolProxy.
 public class SQLServerConnection implements ISQLServerConnection {
+    boolean contextIsAlreadyChanged = false;
+    boolean contextChanged = false;
+
     long timerExpire;
     boolean attemptRefreshTokenLocked = false;
 
@@ -3079,6 +3082,8 @@ final void poolCloseEventNotify() throws SQLServerException {
         checkClosed();
         if (catalog != null) {
             connectionCommand("use " + Util.escapeSQLId(catalog), "setCatalog");
+            contextIsAlreadyChanged = true;
+            contextChanged = true;
             sCatalog = catalog;
         }
         loggerExternal.exiting(getClassNameLogging(), "setCatalog");
@@ -5760,6 +5765,12 @@ final void evictCachedPreparedStatementHandle(PreparedStatementHandle handle) {
     	preparedStatementHandleCache.remove(handle.getKey());
     }
 
+    final void clearCachedPreparedStatementHandle() {
+        if (null != preparedStatementHandleCache) {
+            preparedStatementHandleCache.clear();
+        }
+    }
+
     // Handle closing handles when removed from cache.
     final class PreparedStatementCacheEvictionListener implements EvictionListener<Sha1HashKey, PreparedStatementHandle> {
         public void onEviction(Sha1HashKey key, PreparedStatementHandle handle) {

src/main/java/com/microsoft/sqlserver/jdbc/SQLServerConnectionPoolProxy.java

@@ -168,6 +168,9 @@ public void run() {
         if (bIsOpen && (null != wrappedConnection)) {
             if (wrappedConnection.getConnectionLogger().isLoggable(Level.FINER))
                 wrappedConnection.getConnectionLogger().finer(toString() + " Connection proxy closed ");
+
+            // clear cached prepared statement handle on this connection
+            wrappedConnection.clearCachedPreparedStatementHandle();
             wrappedConnection.poolCloseEventNotify();
             wrappedConnection = null;
         }