cacheDSNow

语法

cacheDSNow(ds)

参数

ds 是数据源或数据源列表。

详情

函数 cacheDSNow 立即执行并缓存数据源和缓存行的总数。

例子

PTNDB_DIR = "/home/db_testing"
dbName = database(PTNDB_DIR + "/NYSETAQByName")
Trades = dbName.loadTable(`Trades)

ds=sqlDS(<select Time,Exchange,Symbol,Trade_Volume as Vol, Trade_Price as Price from Trades>)
ds.cacheDSNow()        # cache the data immediately
ds.clearDSCacheNow()  # clear the cache immediately