Examples of DBReader

org.apache.empire.db.DBReader
This class is used to perform database queries from a DBCommand object and access the results.
In oder to perform a query call the open() function or - for single row queries - call getRecordData();
You can iterate through the rows using moveNext() or an iterator.

However take care: A reader must always be explicitly closed using the close() method!
Otherwise you may lock the JDBC connection and run out of resources.
Use
```
try { ... } finally { reader.close(); } 
```
to make sure the reader is closed.

To access and work with the query result you can do one of the following:
- access field values directly by using one of the get... functions (see {@link DBRecordData})
- get the rows as a list of Java Beans using by using {@link DBReader#getBeanList(Class,int)}
- get the rows as an XML-Document using {@link DBReader#getXmlDocument()}
- initialize a DBRecord with the current row data using {@link DBReader#initRecord(DBRowSet,DBRecord)}
  This will allow you to modify and update the data.

Examples of org.apache.empire.db.DBReader

                cmd.skipRows(1);
        }
        */
        
    // Query Records and print output
    DBReader reader = new DBReader();
    try
        {
      // Open Reader
      System.out.println("Running Query:");
      System.out.println(cmd.getSelect());
      reader.open(cmd, conn);
      // Print output
      System.out.println("---------------------------------");
      switch(queryType)
      {
          case Reader:
              // Text-Output by iterating through all records.
                  while (reader.moveNext())
                    {
                      System.out.println(reader.getString(EMP.EMPLOYEE_ID)
                              + "\t" + reader.getString(EMPLOYEE_FULLNAME)
                              + "\t" + EMP.GENDER.getOptions().get(reader.getString(EMP.GENDER))
                                + "\t" + reader.getString(PHONE_EXT_NUMBER)
                              + "\t" + reader.getString(DEP.NAME));
                  }
              break;
                case BeanList:
                    // Text-Output using a list of Java Beans supplied by the DBReader
                    List<SampleBean> beanList = reader.getBeanList(SampleBean.class);
                    System.out.println(String.valueOf(beanList.size()) + " SampleBeans returned from Query.");
                    for (SampleBean b : beanList)
                    {
                        System.out.println(b.toString());
                    }
                    break;
                case XmlDocument:
                    // XML Output
                    Document doc = reader.getXmlDocument();
                    // Print XML Document to System.out
                    XMLWriter.debug(doc);
                    break;
      }


    } finally
        {
      // always close Reader
      reader.close();
    }
  }

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Examples of org.apache.empire.db.DBReader

        emp.update(conn);
    
    // read a value
    DBCommand cmd = db.createCommand();
    cmd.select(db.DATA.DATA);
    DBReader reader = new DBReader();
    reader.open(cmd, conn);
    while(reader.moveNext()){
      byte[] value = (byte[]) reader.getValue(db.DATA.DATA);
      Assert.assertArrayEquals(new byte[]{1,2,3}, value);
    }
    conn.close();
  }

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Examples of org.apache.empire.db.DBReader

    public RuntimeException translateEmpireException(EmpireException e) {
        return new EmpireDBException(e);
    }


    protected DBReader openReader(DBCommand cmd, Connection conn) {
        DBReader r = new DBReader();
        r.open(cmd, conn);
        return r;
    }

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Examples of org.apache.empire.db.DBReader

                    Object value = record.getValue(keyColumns[0]);
                    cmd.where(keyColumns[0].isNot(value));
                }
            }
            // Query now
            DBReader reader = new DBReader();
            try { 
                reader.getRecordData(cmd, action.getConnection());
                // We have found a record
                Object[] key = new Object[keyColumns.length];
                for (int i=0; i<keyColumns.length; i++)
                {   // Check if column has changed
                    key[i] = reader.getValue(i);
                }
                return key;
            } catch(QueryNoResultException e) {
                // ignore
            } finally {
                reader.close();
            }
        }
        // No, no conflicts
        return null;
    }

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Examples of org.apache.empire.db.DBReader

    {
        // Make sure previous reader is closed
        if (reader!=null)
            reader.close();
        // Create a new reader
        reader = new DBReader();
        reader.open(cmd, scrollable, action.getConnection() );
        // Move to desired Position
        int first = this.getFirstItemIndex();
        if (first>0 && !reader.skipRows(first))
        {   // Page is not valid. Try again from beginning

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Examples of org.apache.empire.db.DBReader

    }


    // SupplierReader
    public boolean initBeanList(DBCommand cmd)
    {
        DBReader reader = new DBReader();
        try {
            // Open Suppier Reader
            reader.open(cmd, action.getConnection());
            // Move to desired Position
            int first = this.getFirstItemIndex();
            if (first>0 && !reader.skipRows(first))
            {   // Page is not valid. Try again from beginning
                reader.close();
                setFirstItem(0);
                initBeanList(cmd);
            }
            // Read List
            list = reader.getBeanList(beanClass, getPageSize());
            return true;
            
        } catch(Exception e ) {
            action.setActionError(e);
            return false;
            
        } finally {
            reader.close();
        }
    }

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Examples of org.apache.empire.db.DBReader

        DBCommand sysDBCommand = sysDB.createCommand();
        sysDBCommand.select(sysDB.CI.getColumns());
        sysDBCommand.where (sysDB.CI.C_OWNER.is(owner));
        
        OracleDataDictionnary dataDictionnary = new OracleDataDictionnary();
        DBReader rd = new DBReader();
        try
        {
            rd.open(sysDBCommand, conn);
            // read all
            log.info("---------------------------------------------------------------------------------");
            log.info("checkDatabase start: " + db.getClass().getName());
            String skipTable = "";
            while (rd.moveNext())
            {
                String tableName = rd.getString(sysDB.CI.C_TABLE_NAME);


                // if a table wasn't found before, skip it
                if (tableName.equals(skipTable))
                    continue;


                // check if the found table exists in the DBDatabase object
                String columnName = rd.getString(sysDB.CI.C_COLUMN_NAME);
                DBTable dbTable = db.getTable(tableName);
                DBView  dbView  = db.getView(tableName);
                
                String dataType = rd.getString(sysDB.CI.C_DATA_TYPE);
                int charLength = rd.getInt(sysDB.CI.C_CHAR_LENGTH);
                int dataLength = rd.getInt(sysDB.CI.C_DATA_LENGTH);
                int dataPrecision = rd.getInt(sysDB.CI.C_DATA_PRECISION);
                int dataScale = rd.getInt(sysDB.CI.C_DATA_SCALE);
                String nullable = rd.getString(sysDB.CI.C_NULLABLE);
                
                dataDictionnary.fillDataDictionnary(tableName, columnName, dataType, 
                                                    charLength, dataLength, dataPrecision, dataScale, nullable);
                
                if (dbTable != null)
                {
                    
                    // check if the found column exists in the found DBTable
                    DBColumn col = dbTable.getColumn(columnName);
                    if (col == null)
                    {
                        log.warn("COLUMN NOT FOUND IN " + db.getClass().getName() + "\t: [" + tableName + "]["
                                       + columnName + "][" + dataType + "][" + dataLength + "]");
                        continue;
                    }
                    /*
                    else
                    {   // check the DBTableColumn definition
                        int length = (charLength>0) ? charLength : dataLength;
                        dataDictionnary.checkColumnDefinition(col, dataType, length, dataPrecision, dataScale, nullable.equals("N"));
                    }
                    */
                } 
                else if (dbView!=null)
                {
                    log.debug("Column check for view " + tableName + " not yet implemented.");
                } 
                else
                {
                    log.debug("TABLE OR VIEW NOT FOUND IN " + db.getClass().getName() + "\t: [" + tableName + "]");
                    // skip this table
                    skipTable = tableName;
                    continue;
                }
            }
            // check Tables
            dataDictionnary.checkDBTableDefinition(db.getTables());
            // check Views
            dataDictionnary.checkDBViewDefinition (db.getViews());
            // done
            log.info("checkDatabase end: " + db.getClass().getName());
            log.info("---------------------------------------------------------------------------------");
        } finally {
            // close
            rd.close();
        }
    }

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Examples of org.apache.empire.db.DBReader

                cmd.skipRows(1);
        }
        */
        
    // Query Records and print output
    DBReader reader = new DBReader();
    try
        {
      // Open Reader
      System.out.println("Running Query:");
      System.out.println(cmd.getSelect());
      reader.open(cmd, conn);
      // Print output
      System.out.println("---------------------------------");
      switch(queryType)
      {
          case Reader:
              // Text-Output by iterating through all records.
                  while (reader.moveNext())
                    {
                      System.out.println(reader.getString(EMP.EMPLOYEE_ID)
                              + "\t" + reader.getString(EMPLOYEE_FULLNAME)
                              + "\t" + EMP.GENDER.getOptions().get(reader.getString(EMP.GENDER))
                                + "\t" + reader.getString(PHONE_EXT_NUMBER)
                              + "\t" + reader.getString(DEP.NAME));
                  }
              break;
                case BeanList:
                    // Text-Output using a list of Java Beans supplied by the DBReader
                    List<SampleBean> beanList = reader.getBeanList(SampleBean.class);
                    System.out.println(String.valueOf(beanList.size()) + " SampleBeans returned from Query.");
                    for (SampleBean b : beanList)
                    {
                        System.out.println(b.toString());
                    }
                    break;
                case XmlDocument:
                    // XML Output
                    Document doc = reader.getXmlDocument();
                    // Print XML Document to System.out
                    XMLWriter.debug(doc);
                    break;
      }


    } finally
        {
      // always close Reader
      reader.close();
    }
  }

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Examples of org.apache.empire.db.DBReader

     */
    protected void loadItems(boolean initScrollbar)
    {
        // DBReader
        BeanListTableInfo lti = (BeanListTableInfo) getTableInfo();
        DBReader r = new DBReader();
        try
        { // Check command
            DBCommand queryCmd = lti.getQueryCmd();
            if (queryCmd == null)
                throw new ObjectNotValidException(this);


            boolean loadPageFromPosition = lti.isValid() && lti.isAllowPagination();
            lti.setValid(false);


            if (lti.isSortOrderChanged())
            { // Set Sort order
                setOrderBy(queryCmd);
                lti.setSortOrderChanged(false);
            }
            
            int position = 0;
            int skipRows = 0;
            int maxItems = maxItemCount;
            if (loadPageFromPosition)
            {   // detect position
                position = lti.getPosition();
                if (position > lti.getItemCount() - lti.getPageSize())
                { // position > count of entries is not possible, set to max
                    position = lti.getItemCount() - lti.getPageSize();
                }
                if (position < 0)
                { // position < 0 is not possible, set to 0
                    position = 0;
                }
                // maxItems
                maxItems = lti.getPageSize();
                skipRows = position;
                // constraint
                DBDatabaseDriver driver = queryCmd.getDatabase().getDriver(); 
                if (driver.isSupported(DBDriverFeature.QUERY_LIMIT_ROWS))
                {   // let the database limit the rows
                    if (skipRows>0 && driver.isSupported(DBDriverFeature.QUERY_SKIP_ROWS))
                    {   // let the database skip the rows
                        queryCmd.skipRows(skipRows);
                        skipRows = 0;
                    }
                    queryCmd.limitRows(skipRows+maxItems);
                }
            }


            // DBReader.open immer nur innerhalb eines try {} finally {} blocks!
            r.open(queryCmd, getConnection(queryCmd));


            // get position from the session
            if (skipRows>0)
            {   // we are not at position 0, "skipping" entries
                r.skipRows(skipRows);
            }


            // Read all Items
            items = r.getBeanList(beanClass, maxItems);
            if (items == null)
                throw new UnexpectedReturnValueException(items, "DBReader.getBeanList");
            generateIdParams(rowset, items);
            assignSelectionMap(items);


            // set position at session object
            if (loadPageFromPosition)
            { // set valid
                if (position + items.size() > lti.getItemCount())
                { // Oops: More items than expected.
                    log.warn("Item count of {} has changed. Adjusting item count.", getPropertyName());
                    lti.init(position + items.size(), lti.getPageSize());
                }
                lti.setPosition(position);
                lti.setModified(false);
                lti.setValid(true);
            }
            else
            { // Init the list
                lti.init(items.size(), 0);
            }
        }
        catch (RuntimeException e)
        {
            log.error("Error loading bean list " + e.getMessage(), e);
            throw e;
        }
        finally
        {
            r.close();
            // Pagination
            if (lti.isAllowPagination())
            { // Scrollbar   
                if (initScrollbar)
                    initScrollbar();

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Examples of org.apache.empire.db.DBReader

    db.open(driver, conn);
    DBCommand cmd = db.createCommand();
    cmd.select(EMP.EMPLOYEE_ID, EMP.FIRSTNAME);


    int rowCount = 0;
    DBReader reader = new DBReader();
    try {
      System.err.println(cmd.getSelect());
      reader.open(cmd, conn);
      while (reader.moveNext()) {
        rowCount++;
        System.out.println(reader.getString(EMP.EMPLOYEE_ID) + "\t" + reader.getString(EMP.FIRSTNAME));
      }
    } finally {
      reader.close();
    }
    
    assertEquals("We expect 3 rows", 3, rowCount);


  }

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