clearDSCacheNow

语法

clearDSCacheNow(ds)

参数

ds 是数据源或数据源列表。

详情

函数 clearDSCacheNow 立即清除数据源和缓存。

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