Package com.caucho.db.sql

Source Code of com.caucho.db.sql.UpdateQuery

/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT.  See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
*   Free Software Foundation, Inc.
*   59 Temple Place, Suite 330
*   Boston, MA 02111-1307  USA
*
* @author Scott Ferguson
*/

package com.caucho.db.sql;

import com.caucho.db.Database;
import com.caucho.db.table.Column;
import com.caucho.db.table.Table;
import com.caucho.db.table.TableIterator;
import com.caucho.db.xa.DbTransaction;
import com.caucho.quercus.lib.db.SQLExceptionWrapper;

import java.io.IOException;
import java.sql.SQLException;
import java.util.logging.Logger;

class UpdateQuery extends Query {
  private static final Logger log
    = Logger.getLogger(UpdateQuery.class.getName());

  private final Table _table;
  private SetItem []_setItems;

  UpdateQuery(Database db, String sql, Table table)
    throws SQLException
  {
    super(db, sql, null);

    _table = table;

    setFromItems(new FromItem[] { new FromItem(table, table.getName()) });
  }

  public void setSetItems(SetItem []setItems)
  {
    _setItems = setItems;
  }

  public boolean isReadOnly()
  {
    return false;
  }

  /**
   * Binds the query.
   */
  protected void bind()
    throws SQLException
  {
    super.bind();

    for (int i = 0; i < _setItems.length; i++) {
      Expr expr = _setItems[i].getExpr();
     
      expr = expr.bind(this);

      _setItems[i].setExpr(expr);
    }
  }

  /**
   * Executes the query.
   */
  public void execute(QueryContext context, DbTransaction xa)
    throws SQLException
  {
    int count = 0;
    SetItem []setItems = _setItems;
    TableIterator []rows = new TableIterator[1];
    rows[0] = _table.createTableIterator();
    context.init(xa, rows, isReadOnly());
   
    try {
      if (! start(rows, rows.length, context, xa)) {
        return;
      }

      do {
        TableIterator iter = rows[0];
        // iter.setDirty();

        for (int i = 0; i < setItems.length; i++) {
          Column column = setItems[i].getColumn();
          Expr expr = setItems[i].getExpr();

          column.set(xa, iter, expr, context);
        }

        context.setRowUpdateCount(++count);
      } while (nextTuple(rows, rows.length, context, xa));
    } catch (IOException e) {
      throw new SQLExceptionWrapper(e);
    } finally {
      // autoCommitWrite must be before freeRows in case freeRows
      // throws an exception
      context.close();
     
      freeRows(rows, rows.length);
    }
  }

  public String toString()
  {
    StringBuilder cb = new StringBuilder();
    cb.append("UpdateQuery[");
    if (_whereExpr != null) {
      cb.append(",where:" + _whereExpr);
    }
    cb.append("]");
   
    return cb.toString();
  }
}
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