code: protected void clearStatementCaches(boolean internalClose) {
  
  		if (this.statementCachingEnabled){ // safety
  
  			if (internalClose){
  				this.callableStatementCache.clear();
  				this.preparedStatementCache.clear();
  			} else {
  				if (this.pool.closeConnectionWatch){ // debugging enabled?
  					this.callableStatementCache.checkForProperClosure();
  					this.preparedStatementCache.checkForProperClosure();
  				}
  			}
  		}
  	}
docs: Clears out the statement handles.
  @param internalClose if true, close the inner statement handle too.