createtablesqlbuilder.java

把java对象映射成数据库表中的一条记录

/*
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations under
 * the License.
 *
 * The Original Code is jRelationalFramework.
 *
 * The Initial Developer of the Original Code is is.com.
 * Portions created by is.com are Copyright (C) 2000 is.com.
 * All Rights Reserved.
 *
 * Contributor(s): Jonathan Carlson ([e-mail])
 * Contributor(s): ____________________________________
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License (the "GPL") or the GNU Lesser General
 * Public license (the "LGPL"), in which case the provisions of the GPL or
 * LGPL are applicable instead of those above.  If you wish to allow use of
 * your version of this file only under the terms of either the GPL or LGPL
 * and not to allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and replace them
 * with the notice and other provisions required by either the GPL or LGPL
 * License.  If you do not delete the provisions above, a recipient may use
 * your version of this file under either the MPL or GPL or LGPL License.
 *
 */
package com.is.jrf;


import com.is.util.sql.JDBCHelper;

import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;


/**
 *  Instances of this class build SQL to do CREATE TABLE statements.
 */
public class CreateTableSQLBuilder
        extends SQLBuilder
  {

  /* ===============  Constructors  =============== */

  /**
   * This constructor throws an exception.
   */
  public CreateTableSQLBuilder()
    {
    super();
    }

  public CreateTableSQLBuilder(AbstractDomain domain)
    {
    super(domain);
    }



  /**
   * Build SQL to create a table the supplied tableName and columnSpecs
   *
   * @param tableName   The name of the table to create.
   * @param columnSpecs a value of type 'List'
   * @return a value of type 'String'
   */
  public String buildSQL(String tableName,
                         List columnSpecs)
    {
    ColumnSpec aColumnSpec = null;
    ColumnSpec pkColumnSpec = null;

    if (i_dbPolicy == null)
        {
        throw new DatabaseException(
            "The DatabasePolicy has not been set for " + this);
        }

    StringBuffer sqlBuffer = new StringBuffer();
    sqlBuffer.append(" CREATE TABLE ");
    sqlBuffer.append(tableName);
    sqlBuffer.append("(");

    // Define each column
    Iterator iterator = columnSpecs.iterator();
    while (iterator.hasNext())
        {
        aColumnSpec = (ColumnSpec)iterator.next();
        sqlBuffer.append(
            aColumnSpec.columnDefinitionString(i_domain.getDatabasePolicy()));
        sqlBuffer.append(", ");
        } // while

    pkColumnSpec = i_domain.getPrimaryKeyColumnSpec();
    if (pkColumnSpec != null)
        {
        sqlBuffer.append("PRIMARY KEY (");
        sqlBuffer.append(
            pkColumnSpec.getColumnName());
        sqlBuffer.append(")");
        }

    sqlBuffer.append(")"); // end of CREATE TABLE statement

    return sqlBuffer.toString();
    } // buildSQL()


  } // CreateTableSQLBuilder