使用Spring的JdbcTemplate处理Clob

1. 数据库表 req_seq

 

CREATE TABLE req_seq
(
req_id VARCHAR2(36) PRIMARY KEY,
seq VARCHAR2(100),
req_xml CLOB,
req_time DATE
);

 

2. 实体类

 

import java.io.Serializable;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;

public class ReqSeqBean implements Serializable {

	/**
	 * @Fields serialVersionUID : TODO
	 */
	private static final long serialVersionUID = -4200518336372141644L;

	// 主键
	private String reqId;
	// 请求序列
	private String req;
	// 请求XML
	private String reqXml;
	// 请求时间
	private Timestamp reqTime;
	
	public String toString() {
		
		SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		
		StringBuffer buf = new StringBuffer("ReqSeqBean:[");
		
		buf.append("reqId=").append(reqId).append(", ");
		buf.append("req=").append(req).append(", ");
		buf.append("reqXml=").append(reqXml).append(", ");
		buf.append("reqTime=").append(df.format(reqTime));
		
		return buf.toString();
	}

	// 省略 setter/getter
}

 

 

注意： 数据库表中，REQ_XML 的类型是 CLOB，实体类中是 String

 

3. DAO层配置

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
	<bean id="nativeJdbcExtractor" 
		class="org.springframework.jdbc.support.nativejdbc.CommonsDbcpNativeJdbcExtractor"
		lazy-init="true"/>
	<bean id="oracleLobHandler" 
		class="org.springframework.jdbc.support.lob.OracleLobHandler" 
		lazy-init="true">
		<property name="nativeJdbcExtractor" ref="nativeJdbcExtractor"/>
	</bean>
	<bean id="reqSeqDAO" class="com.dao.ReqSeqDAO">
		<property name="jdbcTemplate" ref="jdbcTemplate" />
		<property name="hisJdbcTemplate" ref="jdbcTemplate" />
		<property name="lobHandler" ref="oracleLobHandler"/>
	</bean>
</beans>

 

4. DAO

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.support.AbstractLobCreatingPreparedStatementCallback;
import org.springframework.jdbc.support.lob.LobCreator;
import org.springframework.jdbc.support.lob.LobHandler;

public class ReqSeqDAO extends BaseDao {

	private static final Logger log = LoggerFactory.getLogger(ReqSeqDAO.class);

	private LobHandler lobHandler;

	/**
	 * @Title: addReqSeq
	 * @deprecated: 如果字段REQ_XML是clob类型，则用此方法,但是需要oracle版本和jdk版本一致
	 * @param bean
	 * @throws Exception
	 * @author 
	 * @date 2013年10月23日
	 */
	public void addReqSeq(final ReqSeqBean bean) throws Exception {

		StringBuffer sql = new StringBuffer();

		sql.append("INSERT INTO REQ_SEQ(REQ_ID, SEQ, REQ_XML, REQ_TIME) ");
		sql.append("VALUES(SYS_GUID(), ?, ?, ");
		sql.append("TO_DATE(TO_CHAR(SYSDATE,'yyyy-MM-dd hh24:mi:ss'),'yyyy-MM-dd hh24:mi:ss'))");

		getJdbcTemplate().execute(sql.toString(),
				new AbstractLobCreatingPreparedStatementCallback(lobHandler) {

					@Override
					protected void setValues(PreparedStatement ps,
							LobCreator lobCreator) throws SQLException,
							DataAccessException {
						ps.setString(1, bean.getReq());
						lobCreator.setClobAsString(ps, 2, bean.getReqXml());
					}
				});
	}

	/**
	 * @Title: queryReqSeqList
	 * @deprecated: 按条件查找请求序列信息(如果字段REQ_XML是clob类型，则用此方法,但是需要oracle版本和jdk版本一致)
	 * @param bean
	 *            查询条件
	 * @return List
	 * @throws Exception
	 * @author 
	 * @date 2013年10月23日
	 */
	public List<ReqSeqBean> queryReqSeqList(ReqSeqBean bean) throws Exception {

		StringBuffer sql = new StringBuffer(
				"SELECT * FROM REQ_SEQ WHERE 1 = 1 ");

		// 查询条件
		List<String> params = new ArrayList<String>(1);

		if (null != bean) {
			/* 添加查询条件 */
			if (null != bean.getReq()) {
				// 请求序列号
				sql.append(" AND SEQ = ? ");
				params.add(bean.getReq());
			}
		}

		sql.append(" ORDER BY REQ_TIME DESC");

		final List<ReqSeqBean> list = new ArrayList<ReqSeqBean>(10);

		getJdbcTemplate().query(sql.toString(), params.toArray(),
				new RowMapper() {

					@Override
					public Object mapRow(ResultSet rs, int rowNum)
							throws SQLException {

						ReqSeqBean seq = new ReqSeqBean();

						seq.setReqId(rs.getString("REQ_ID"));
						seq.setReq(rs.getString("SEQ"));
						seq.setReqXml(lobHandler.getClobAsString(rs,
								"REQ_XML"));
						seq.setReqTime(rs.getTimestamp("REQ_TIME"));

						list.add(seq);

						return seq;
					}
				});

		return list;
	}

	public LobHandler getLobHandler() {
		return lobHandler;
	}

	public void setLobHandler(LobHandler lobHandler) {
		this.lobHandler = lobHandler;
	}
}