org.gcube.datatransfer.scheduler.db
Class DBManager

java.lang.Object
  extended by org.gcube.datatransfer.scheduler.db.DBManager
Direct Known Subclasses:
DataTransferDBManager

public abstract class DBManager
extends Object


Nested Class Summary
static interface DBManager.BaseConsumer
           
 
Field Summary
protected static File backupFolder
           
protected static int backupIntervalMS
           
protected  String dbFileBaseFolder
          dbFileName is used to open or create files that hold the state of the db.
protected  String dbFileName
           
protected  String dbName
           
protected  javax.jdo.PersistenceManagerFactory persistenceFactory
           
 
Constructor Summary
DBManager()
          Constructor for SQLDBManager
 
Method Summary
 void backup()
          checkpoint the db and create a backup
 void close()
          Shutdown the db and close the connection to the db.
 String queryJSON(String expression)
          Executes SQL command SELECT and invokes the given consumer, giging back JSON formatetted output.
protected static String quote(String string)
          Produce a string in double quotes with backslash sequences in all the right places.
static String toJSon(ResultSet resultSet)
           
protected  void zipFolder(File[] files)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

persistenceFactory

protected javax.jdo.PersistenceManagerFactory persistenceFactory

backupFolder

protected static File backupFolder

dbFileBaseFolder

protected String dbFileBaseFolder
dbFileName is used to open or create files that hold the state of the db. It can contain directory names relative to the current working directory


dbFileName

protected String dbFileName

dbName

protected String dbName

backupIntervalMS

protected static int backupIntervalMS
Constructor Detail

DBManager

public DBManager()
Constructor for SQLDBManager

Method Detail

close

public void close()
           throws Exception
Shutdown the db and close the connection to the db.

Throws:
Exception

backup

public void backup()
            throws SQLException,
                   Exception
checkpoint the db and create a backup

Throws:
SQLException - if the CHECKPOINT query fails
Exception

queryJSON

public String queryJSON(String expression)
                 throws SQLException,
                        Exception
Executes SQL command SELECT and invokes the given consumer, giging back JSON formatetted output.

Parameters:
expression - the SQL expression to evaluate
Returns:
Result Set
Throws:
SQLException - if the query fails
Exception - if the given resultset consumer fails

toJSon

public static String toJSon(ResultSet resultSet)
                     throws SQLException
Parameters:
resultSet -
Returns:
Json String
Throws:
SQLException

quote

protected static String quote(String string)
Produce a string in double quotes with backslash sequences in all the right places. A backslash will be inserted within
Parameters:
string - A String
Returns:
A String correctly formatted for insertion in a JSON text.

zipFolder

protected void zipFolder(File[] files)
                  throws Exception
Throws:
Exception


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