基於spring框架，以bean形式配置實例，用於獲取oracle上已存在sequence的遞增值。

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.sql.DataSource;

import org.springframework.jdbc.support.incrementer.OracleSequenceMaxValueIncrementer;

import com.huawei.widget.commons.dao.DBException;
import com.huawei.widget.commons.dao.spi.SequenceGenerator;
import com.huawei.widget.commons.exception.ErrorCode;

/**
 * 基於spring框架，以bean形式配置實例，用於獲取oracle上已存在sequence的遞增值。
 *
 * @author g00106664
 * @version C02 2009-5-14
 * @since OpenEye WIDGET_SRV V100R001C02
 */
public class OracleSequenceGeneratorSpringImpl implements SequenceGenerator
{
    /**
     * 自增器緩存容器
     */
    private Map<String, OracleSequenceMaxValueIncrementer> incrementerMap = null;

    /**
     * 默認構造函數
     */
    public OracleSequenceGeneratorSpringImpl()
    {
    }

    /*
     * （非 Javadoc）
     *
     * @see com.huawei.widget.commons.dao.spi.SequenceGenerator#init(javax.sql.DataSource,
     *      java.util.List)
     */
    public void init(DataSource dataSource, List<String> sequenceNames)
    {
        incrementerMap = Collections
                .synchronizedMap(new HashMap<String, OracleSequenceMaxValueIncrementer>());

        if (sequenceNames != null)
        {
            for (String sequenceName : sequenceNames)
            {
                incrementerMap.put(sequenceName,
                        new OracleSequenceMaxValueIncrementer(dataSource,
                                sequenceName));
            }
        }
    }

    /*
     * （非 Javadoc）
     *
     * @see com.huawei.widget.commons.dao.spi.SequenceGenerator#nextIntValue(java.lang.String)
     */
    public int nextIntValue(String sequenceName) throws DBException
    {
        return getIncrementer(sequenceName).nextIntValue();
    }

    /*
     * （非 Javadoc）
     *
     * @see com.huawei.widget.commons.dao.spi.SequenceGenerator#nextLongValue(java.lang.String)
     */
    public long nextLongValue(String sequenceName) throws DBException
    {
        return getIncrementer(sequenceName).nextLongValue();
    }

    /*
     * （非 Javadoc）
     *
     * @see com.huawei.widget.commons.dao.spi.SequenceGenerator#nextStringValue(java.lang.String)
     */
    public String nextStringValue(String sequenceName) throws DBException
    {
        return getIncrementer(sequenceName).nextStringValue();
    }

    private OracleSequenceMaxValueIncrementer getIncrementer(String sequenceName)
            throws DBException
    {
        OracleSequenceMaxValueIncrementer incrementer = incrementerMap
                .get(sequenceName);
        if (null == incrementer)
        {
            throw new DBException(ErrorCode.COMMON_GET_SEQUENCE_UNIKEY_FAIL,
                    "The incrementer of sequence:" + sequenceName
                            + " is not initialized.");
        }

        return incrementer;
    }
}