DBCache (PDI Core 9.5.0.0-252 API)

java.lang.Object
- org.pentaho.di.core.DBCache

```
public class DBCache
extends Object
```
This class caches database queries so that the same query doesn't get called twice. Queries are often launched to the databases to get information on tables etc.

Since:

15-01-04

Author:

Matt

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`clear(String dbname)`	Clear out all entries of database with a certain name
`RowMetaInterface`	`get(DBCacheEntry entry)`	Get the fields as a row generated by a database cache entry
`static String`	`getFilename()`
`static DBCache`	`getInstance()`	Create the database cache instance by loading it from disk
`boolean`	`isActive()`
`void`	`put(DBCacheEntry entry, RowMetaInterface fields)`
`void`	`saveCache()`
`void`	`setActive()`
`void`	`setActive(boolean act)`
`void`	`setInactive()`
`int`	`size()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - setActive
```
public void setActive()
```
  - setInactive
```
public void setInactive()
```
  - setActive
```
public void setActive(boolean act)
```
  - isActive
```
public boolean isActive()
```
  - put
```
public void put(DBCacheEntry entry,
                RowMetaInterface fields)
```
  - get
```
public RowMetaInterface get(DBCacheEntry entry)
```
    Get the fields as a row generated by a database cache entry
    
    Parameters:
    
    entry - the entry to look for
    
    Returns:
    
    the fields as a row generated by a database cache entry
  - size
```
public int size()
```
  - clear
```
public void clear(String dbname)
```
    Clear out all entries of database with a certain name
    
    Parameters:
    
    dbname - The name of the database for which we want to clear the cache or null if we want to clear it all.
  - getFilename
```
public static String getFilename()
```
  - saveCache
```
public void saveCache()
               throws KettleFileException
```
    Throws:
    
    KettleFileException
  - getInstance
```
public static DBCache getInstance()
```
    Create the database cache instance by loading it from disk
    
    Returns:
    
    the database cache instance.