dbutils例子

自定义扩展 
　　如果用户想要依照存入Map的顺序显示内容，好像不能直接支持。看了看源码，自定义了一个扩展类。用法在前的代码中有示例。 asdfasd

package com.exam.util;

import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;

import org.apache.commons.dbutils.BasicRowProcessor;

/**
 * 用于apache的dbutil类的功能改进，当需要Map中的Key能按输入的顺序输出时，使用这个类来进行处理。简单改了一下基类。<br/>
 * 编码：wallimn　时间：2012-7-25　上午11:07:06<br/>
 * 版本：V1.0<br/>
 */
public class BasicRowProcessorEx extends BasicRowProcessor {

    private static class CaseInsensitiveLinkedHashMap extends HashMap<String, Object> {
        private final Map<String, String> lowerCaseMap = new LinkedHashMap<String, String>();
        private static final long serialVersionUID = -2848100435296897392L;

        /** {@inheritDoc} */
        @Override
        public boolean containsKey(Object key) {
            Object realKey = lowerCaseMap.get(key.toString().toLowerCase());
            return super.containsKey(realKey);
        }

        /** {@inheritDoc} */
        @Override
        public Object get(Object key) {
            Object realKey = lowerCaseMap.get(key.toString().toLowerCase());
            return super.get(realKey);
        }

        /** {@inheritDoc} */
        @Override
        public Object put(String key, Object value) {
            Object oldKey = lowerCaseMap.put(key.toLowerCase(), key);
            Object oldValue = super.remove(oldKey);
            super.put(key, value);
            return oldValue;
        }

        /** {@inheritDoc} */
        @Override
        public void putAll(Map<? extends String, ?> m) {
            for (Map.Entry<? extends String, ?> entry : m.entrySet()) {
                String key = entry.getKey();
                Object value = entry.getValue();
                this.put(key, value);
            }
        }

        /** {@inheritDoc} */
        @Override
        public Object remove(Object key) {
            Object realKey = lowerCaseMap.remove(key.toString().toLowerCase());
            return super.remove(realKey);
        }
    }
	@Override
	public Map<String, Object> toMap(ResultSet rs) throws SQLException {
        Map<String, Object> result = new CaseInsensitiveLinkedHashMap();
        ResultSetMetaData rsmd = rs.getMetaData();
        int cols = rsmd.getColumnCount();

        for (int i = 1; i <= cols; i++) {
            result.put(rsmd.getColumnName(i), rs.getObject(i));
        }

        return result;
	}

}

基本操作!

package com.exam.test;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import junit.framework.TestCase;
import org.apache.commons.dbutils.DbUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.ArrayHandler;
import org.apache.commons.dbutils.handlers.ArrayListHandler;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.ColumnListHandler;
import org.apache.commons.dbutils.handlers.MapHandler;
import org.apache.commons.dbutils.handlers.MapListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;
import com.exam.db.DbManager;
import com.exam.util.BasicRowProcessorEx;

public class TestSomething extends TestCase {
	public void testDBUtilSelect() {
		Connection conn = DbManager.getInstance().getConnection();

		QueryRunner queryRunner = new QueryRunner();

		try {
			// 返回单行记录，使用Map
			System.out.println("使用Map处理单行记录！");
			Map<String, Object> map = queryRunner.query(conn,
					"select * from tab where rownum=1", new MapHandler(),
					(Object[]) null);

			for (Iterator<Entry<String, Object>> i = map.entrySet().iterator(); i
					.hasNext();) {
				Entry<String, Object> e = i.next();
				System.out.println(e.getKey() + "=" + e.getValue());
			}

			System.out.println("处理多行记录！");
			List<Map<String, Object>> list = queryRunner.query(conn,
					"select * from tab where rownum<=3", new MapListHandler(),
					(Object[]) null);

			for (Iterator<Map<String, Object>> li = list.iterator(); li
					.hasNext();) {
				System.out.println("--------------");
				Map<String, Object> m = li.next();
				for (Iterator<Entry<String, Object>> mi = m.entrySet()
						.iterator(); mi.hasNext();) {
					Entry<String, Object> e = mi.next();
					System.out.println(e.getKey() + "=" + e.getValue());
				}
			}

			System.out.println("使用Bean处理单行记录！");

			// com.exam.test.TestSomething.Tab
			Tab tab = queryRunner.query(conn,
					"select tname from tab where rownum=1",
					new BeanHandler<Tab>(Tab.class));
			System.out.println("tname=" + tab.getTname());
			System.out.println("tabtype=" + tab.getTabtype());

			System.out.println("使用Array处理单行记录！");
			Object[] array = queryRunner.query(conn,
					"select * from tab where rownum=1", new ArrayHandler());

			for (int i = 0; i < array.length; i++) {
				System.out.println(array[i]);
			}

			System.out.println("使用Array处理多行记录！");
			List<Object[]> arraylist = queryRunner
					.query(conn, "select * from tab where rownum<=3",
							new ArrayListHandler());

			for (Iterator<Object[]> itr = arraylist.iterator(); itr.hasNext();) {
				Object[] a = itr.next();
				System.out.println("--------------");
				for (int i = 0; i < a.length; i++) {
					System.out.println(a[i]);

				}
			}

			System.out.println("使用ColumnListHandler处理单行记录，返回其中指定的一列！");
			List<Object> colList = queryRunner.query(conn,
					"select * from tab where rownum=1", new ColumnListHandler(
							"tname"));
			for (Iterator<Object> itr = colList.iterator(); itr.hasNext();) {
				System.out.println(itr.next());
			}

			System.out
					.println("使用ScalarHandler处理单行记录，只返回结果集第一行中的指定字段，如未指定字段，则返回第一个字段！");
			Object scalar1 = queryRunner.query(conn, "select * from tab",
					new ScalarHandler("tname"));
			System.out.println(scalar1);
			Object scalar2 = queryRunner.query(conn,
					"select tname,tabtype from tab", new ScalarHandler());
			System.out.println(scalar2);

			// 使用自定义的行处理器
			// Map中的KEY可按输入顺序输出
			System.out.println("使用Map处理单行记录(使用自定义行处理器)！");
			Map<String, Object> linkedmap = queryRunner
					.query(
							conn,
							"select tabtype,tname,'wallimn' as programmer from tab where rownum=1",
							new MapHandler(new BasicRowProcessorEx()),
							(Object[]) null);

			for (Iterator<Entry<String, Object>> i = linkedmap.entrySet()
					.iterator(); i.hasNext();) {
				Entry<String, Object> e = i.next();
				System.out.println(e.getKey() + "=" + e.getValue());
			}

			// 使用自定义的行处理器
			// Map中的KEY可按输入顺序输出
			System.out.println("处理多行记录(使用自定义行处理器)！");
			List<Map<String, Object>> listLinedMap = queryRunner
					.query(
							conn,
							"select tabtype,tname,'wallimn' as programmer from tab where rownum<=3",
							new MapListHandler(new BasicRowProcessorEx()),
							(Object[]) null);

			for (Iterator<Map<String, Object>> li = listLinedMap.iterator(); li
					.hasNext();) {
				System.out.println("--------------");
				Map<String, Object> m = li.next();
				for (Iterator<Entry<String, Object>> mi = m.entrySet()
						.iterator(); mi.hasNext();) {
					Entry<String, Object> e = mi.next();
					System.out.println(e.getKey() + "=" + e.getValue());
				}
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		DbUtils.closeQuietly(conn);
	}

	public void testDBUtilInsertDeleteUpdateSelect() {
		// 建一个简单的测试表，建表脚本如下
		// create table T_DBUTILTEST(
		// id integer,
		// name varchar2(255)
		// );
		Connection conn = DbManager.getInstance().getConnection();

		QueryRunner queryRunner = new QueryRunner(true);

		try {
			queryRunner.update(conn, "delete from T_DBUTILTEST");
			// queryRunner.update(conn, "truncate table T_DBUTILTEST");
			// 插一条
			for (int i = 0; i < 10; i++) {
				queryRunner.update(conn,
						"insert into T_DBUTILTEST (id,name) values (?,?)", i,
						"http://wallimn.iteye.com");
			}

			// 再插多条
			queryRunner.batch(conn,
					"insert into T_DBUTILTEST (id,name) values (?,?)",
					new Object[][] { { 11, "batch:[email protected]" },
							{ 12, "batch:[email protected]" } });

			// 删除示例
			queryRunner.update(conn, "delete from T_DBUTILTEST where id=1");
			queryRunner.update(conn, "delete from T_DBUTILTEST where id=?", 2);
			queryRunner.batch(conn, "delete from T_DBUTILTEST where id=?",
					new Object[][] { { 3 }, { 4 } });

			// 修改示例
			queryRunner.update(conn,
					"update T_DBUTILTEST set name = ? where id=?", "修改后的新值", 5);

			System.out.println("最终结果显示结果");
			List<Map<String, Object>> list = queryRunner.query(conn,
					"select name,id from T_DBUTILTEST", new MapListHandler(),
					(Object[]) null);

			for (Iterator<Map<String, Object>> li = list.iterator(); li
					.hasNext();) {
				System.out.println("--------------");
				Map<String, Object> m = li.next();
				for (Iterator<Entry<String, Object>> mi = m.entrySet()
						.iterator(); mi.hasNext();) {
					Entry<String, Object> e = mi.next();
					System.out.print(e.getValue());
					System.out.print(",");
				}
				System.out.println();
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		DbUtils.closeQuietly(conn);
	}
}