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.