spring 中StoredProcedure的用法

 StoredProcedure是一个抽象类,必须写一个子类来继承它,这个类是用来简化JDBCTemplate执行存储过程操作的。

首先我们写一个实现类:

package com.huaye.framework.dao;

import java.sql.Types;
import java.util.HashMap;
import java.util.Map;

import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.SqlOutParameter;
import org.springframework.jdbc.core.SqlParameter;
import org.springframework.jdbc.core.SqlReturnResultSet;
import org.springframework.jdbc.object.StoredProcedure;

/**
 * Name:StoredProcedureTemplate User: HP Date: 2007-7-21 Time: 7:40:01
 * Description:
 */
public class StoredProcedureTemplate extends StoredProcedure {

	private HashMap<String, Object> map = new HashMap<String, Object>();

	public StoredProcedureTemplate() {
		super();

	}

	
	public HashMap getMap()
	{
		return this.map;
	}
	
	public void setValue(String key, Object obj) {
		map.put(key, obj);
	}

	public Map execute() {
		if (this.getSql() == null || this.getSql().equals(""))
			return null;
		this.compile();
		return execute(map);
	}

	public void setVarcharParam(String param) {
		this.declareParameter(new SqlParameter(param, Types.VARCHAR));
	}

	public void setDoubleParam(String param) {
		this.declareParameter(new SqlParameter(param, Types.DOUBLE));
	}

	public void setIntegerParam(String param) {
		this.declareParameter(new SqlParameter(param, Types.INTEGER));
	}

	public void setVarcharOutParam(String param) {
		this.declareParameter(new SqlOutParameter(param, Types.VARCHAR));
	}

	public void setDoubleOutParam(String param) {
		this.declareParameter(new SqlOutParameter(param, Types.DOUBLE));
	}

	public void setIntegerOutParam(String param) {
		this.declareParameter(new SqlOutParameter(param, Types.INTEGER));
	}


	public void setInParam(String param,int valueType)
	{
		this.declareParameter(new SqlParameter(param, valueType));
		
	}
	
	public void setOutParam(String param,int valueType)
	{
		this.declareParameter(new SqlOutParameter(param, valueType));
		
	}
	
	public void setReturnParam(String param, RowMapper rowMapper) {
		this.declareParameter(new SqlReturnResultSet(param,rowMapper));
	}

}


写一个测试:

public void test2() {
		ApplicationContext context = new ClassPathXmlApplicationContext(
				"classpath:spring/applicationContext-base.xml");
		JdbcTemplate jdbc = (JdbcTemplate) context.getBean("jdbcTemplate");

		StoredProcedureTemplate template = new StoredProcedureTemplate();
		
		template.setJdbcTemplate(jdbc);
		template.setSql("testproc");
		//注意有返回结果集的时候,第一个参数必须设置为返回结果集参数,不然会报错。
		template.setReturnParam("rows", new FirstReportRowMapper());
		
		template.setIntegerParam("@parama");
		
		template.setValue("@parama", 9);
		
		Map map = template.execute();
		Object o = map.get("rows");
		List<FirstReportVO> list = (List<FirstReportVO>)o;
		for (FirstReportVO vo : list) {
			System.out.println(vo.getSortID()+","+vo.getSortName());
		}
	}


唯一要注意的地方就是测试里备注的地方,我测试了好久才发现,郁闷的一塌糊涂,老是莫名其妙的错,原来将参数互换一下位置就OK了,比如你把

template.setIntegerParam("@parama");写在前面然后再写template.setReturnParam("rows", new FirstReportRowMapper());的话,就会报空指针错误。

这个“rows”可以随便取名字,不过下面map.get("rows")要和你取的名字一致,因为StoredProcedureTemplate会将结果集以这个名字保存在map中返回。

还有要注意的就是设置sqlparamter的顺序要和存储过程中参数的顺序要一致,不然也会报错.

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