Examples of org.apache.derby.impl.sql.execute.AutoincrementCounter

Package org.apache.derby.impl.sql.execute

Examples of org.apache.derby.impl.sql.execute.AutoincrementCounter

org.apache.derby.impl.sql.execute.AutoincrementCounter
AutoincrementCounter is a not so general counter for the specific purposes of autoincrement columns. It can be thought of as an in-memory autoincrement column. The counting or incrementing is done in fashion identical to the AUTOINCREMENTVALUE in SYSCOLUMNS.
To create a counter, the user must call the constructor with a start value, increment and optionally a final value. In addition the caller must specify the schema name, table name and column name uniquely identifying the counter.
When a counter is created it is in an invalid state-- to initialize it, the user must call either update or reset(false). The value of a counter can be changed by either calling reset or update. @author manish

    if (autoincrementCacheHashtable == null)
    {
      autoincrementCacheHashtable = new HashMap();
    }


    AutoincrementCounter aic = 
      (AutoincrementCounter)autoincrementCacheHashtable.get(key);
    if (aic != null)
    {
      if (SanityManager.DEBUG)      
      {
        SanityManager.THROWASSERT(
                "Autoincrement Counter already exists:" + key);
      }
      return;
    }
    
    aic = new AutoincrementCounter(initialValue, 
                     increment, 0, s, t, c, position);
    autoincrementCacheHashtable.put(key, aic);
  }

View Full Code Here

      throws StandardException               
  {
    String key = AutoincrementCounter.makeIdentity(schemaName,tableName,
                             columnName);
    
    AutoincrementCounter aic = 
      (AutoincrementCounter)autoincrementCacheHashtable.get(key);


    if (aic == null)
    {
      if (SanityManager.DEBUG)      
      {
        SanityManager.THROWASSERT("counter doesn't exist:" + key);
      }
      return 0;
    }
    else
    {
      return aic.update();
    }
  }

View Full Code Here

    DataDictionary dd = getDataDictionary();
    for (Iterator it = autoincrementCacheHashtable.keySet().iterator();
       it.hasNext(); )
    {
      Object key = it.next();
      AutoincrementCounter aic = 
        (AutoincrementCounter)autoincrementCacheHashtable.get(key);
      Long value = aic.getCurrentValue();
      aic.flushToDisk(getTransactionExecute(), dd, tableUUID);
      if (value != null)
      {
        autoincrementHT.put(key, value);
      }
    }

View Full Code Here

        if (autoincrementCacheHashtable == null)
        {
            autoincrementCacheHashtable = new HashMap();
        }


        AutoincrementCounter aic = 
            (AutoincrementCounter)autoincrementCacheHashtable.get(key);
        if (aic != null)
        {
            if (SanityManager.DEBUG)            
            {
                SanityManager.THROWASSERT(
                              "Autoincrement Counter already exists:" + key);
            }
            return;
        }
        
        aic = new AutoincrementCounter(initialValue, 
                                       increment, 0, s, t, c, position);
        autoincrementCacheHashtable.put(key, aic);
    }

View Full Code Here

            throws StandardException                           
    {
        String key = AutoincrementCounter.makeIdentity(schemaName,tableName,
                                                       columnName);
        
        AutoincrementCounter aic = 
            (AutoincrementCounter)autoincrementCacheHashtable.get(key);


        if (aic == null)
        {
            if (SanityManager.DEBUG)            
            {
                SanityManager.THROWASSERT("counter doesn't exist:" + key);
            }
            return 0;
        }
        else
        {
            return aic.update();
        }
    }

View Full Code Here

        DataDictionary dd = getDataDictionary();
        for (Iterator it = autoincrementCacheHashtable.keySet().iterator();
             it.hasNext(); )
        {
            Object key = it.next();
            AutoincrementCounter aic = 
                (AutoincrementCounter)autoincrementCacheHashtable.get(key);
            Long value = aic.getCurrentValue();
            aic.flushToDisk(getTransactionExecute(), dd, tableUUID);
            if (value != null)
            {
                autoincrementHT.put(key, value);
            }
        }

View Full Code Here

    if (autoincrementCacheHashtable == null)
    {
      autoincrementCacheHashtable = new Hashtable();
    }


    AutoincrementCounter aic = 
      (AutoincrementCounter)autoincrementCacheHashtable.get(key);
    if (aic != null)
    {
      if (SanityManager.DEBUG)      
      {
        SanityManager.THROWASSERT(
                "Autoincrement Counter already exists:" + key);
      }
      return;
    }
    
    aic = new AutoincrementCounter(initialValue, 
                     increment, 0, s, t, c, position);
    autoincrementCacheHashtable.put(key, aic);
  }

View Full Code Here

      throws StandardException               
  {
    String key = AutoincrementCounter.makeIdentity(schemaName,tableName,
                             columnName);
    
    AutoincrementCounter aic = 
      (AutoincrementCounter)autoincrementCacheHashtable.get(key);


    if (aic == null)
    {
      if (SanityManager.DEBUG)      
      {
        SanityManager.THROWASSERT("counter doesn't exist:" + key);
      }
      return 0;
    }
    else
    {
      return aic.update();
    }
  }

View Full Code Here

    DataDictionary dd = getDataDictionary();
    for (Enumeration e = autoincrementCacheHashtable.keys(); 
       e.hasMoreElements(); )
    {
      Object key = e.nextElement();
      AutoincrementCounter aic = 
        (AutoincrementCounter)autoincrementCacheHashtable.get(key);
      Long value = aic.getCurrentValue();
      aic.flushToDisk(getTransactionExecute(), dd, tableUUID);
      if (value != null)
      {
        autoincrementHT.put(key, value);
      }
    }

View Full Code Here

    if (autoincrementCacheHashtable == null)
    {
      autoincrementCacheHashtable = new HashMap();
    }


    AutoincrementCounter aic = 
      (AutoincrementCounter)autoincrementCacheHashtable.get(key);
    if (aic != null)
    {
      if (SanityManager.DEBUG)      
      {
        SanityManager.THROWASSERT(
                "Autoincrement Counter already exists:" + key);
      }
      return;
    }
    
    aic = new AutoincrementCounter(initialValue, 
                     increment, 0, s, t, c, position);
    autoincrementCacheHashtable.put(key, aic);
  }

View Full Code Here

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