Examples of 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 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);
  }

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Examples of AutoincrementCounter

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