学步园

package demo.dbutilsdemo;</p> <p>import java.sql.Connection;<br /> import java.sql.DriverManager;<br /> import java.sql.SQLException;<br /> import java.util.List;<br /> import java.util.Map;<br /> import org.apache.commons.dbutils.DbUtils;<br /> import org.apache.commons.dbutils.QueryRunner;<br /> import org.apache.commons.dbutils.handlers.ArrayHandler;<br /> import org.apache.commons.dbutils.handlers.ArrayListHandler;<br /> import org.apache.commons.dbutils.handlers.BeanHandler;<br /> import org.apache.commons.dbutils.handlers.BeanListHandler;<br /> import org.apache.commons.dbutils.handlers.ColumnListHandler;<br /> import org.apache.commons.dbutils.handlers.KeyedHandler;<br /> import org.apache.commons.dbutils.handlers.MapHandler;<br /> import org.apache.commons.dbutils.handlers.MapListHandler;<br /> import org.apache.commons.dbutils.handlers.ScalarHandler;</p> <p>public class dbutilsdemo<br /> {<br /> @SuppressWarnings("unchecked")<br /> public static void main(String[] args) throws ClassNotFoundException<br /> {</p> <p> UserField userField = new UserField();</p> <p> Connection conn = null;<br /> String jdbcURL = "jdbc:mysql://localhost:3306/mysqldb";<br /> String jdbcDriver = "com.mysql.jdbc.Driver";<br /> try<br /> {<br /> DbUtils.loadDriver(jdbcDriver);<br /> conn = DriverManager.getConnection(jdbcURL, "root", "root");<br /> conn.setAutoCommit(false); // 关闭自动提交<br /> QueryRunner qRunner = new QueryRunner();</p> <p> // 以下部分代码采用MapHandler存储方式查询<br /> System.out.println("***Using MapHandler***");<br /> Map map = (Map) qRunner.query(conn, "select * from mc_user_field where id = ?", new MapHandler(), new Object[] { "5" });</p> <p> System.out.println("id ------------- name ");<br /> System.out.println(map.get("id") + " ------------- " + map.get("name"));</p> <p> // 以下部分代码采用MapListHandler存储方式查询<br /> System.out.println("***Using MapListHandler***");<br /> List lMap = (List) qRunner.query(conn, "select * from mc_user_field", new MapListHandler());</p> <p> System.out.println("id ------------- name ");<br /> for (int i = 0; i < lMap.size(); i++)<br /> {<br /> Map vals = (Map) lMap.get(i);<br /> System.out.println(vals.get("id") + " ------------- " + vals.get("name"));<br /> }</p> <p> // 以下部分代码采用BeanHandler存储方式查询<br /> System.out.println("***Using BeanHandler***");<br /> userField = (UserField) qRunner.query(conn, "select * from mc_user_field where id = ?", new BeanHandler(Class.forName("cn.lining.test.UserField")), new Object[] { "5" });<br /> System.out.println("id ------------- name ");<br /> System.out.println(userField.getId() + " ------------- " + userField.getName());</p> <p> // 以下部分代码采用BeanListHandler存储方式查询<br /> System.out.println("***Using BeanListHandler***");<br /> List lBean = (List) qRunner.query(conn, "select * from mc_user_field", new BeanListHandler(Class.forName("cn.lining.test.UserField")));<br /> System.out.println("id ------------- name ");<br /> for (int i = 0; i < lBean.size(); i++)<br /> {<br /> userField = (UserField) lBean.get(i);<br /> System.out.println(userField.getId() + " ------------- " + userField.getName());<br /> }</p> <p> // 以下部分代码采用ArrayHandler存储方式查询<br /> System.out.println("***Using ArrayHandler***");<br /> Object[] array = (Object[]) qRunner.query(conn, "select * from mc_user_field where id = ?", new ArrayHandler(), new Object[] { "5" });</p> <p> System.out.println("id ------------- name ");<br /> System.out.println(array[0].toString() + " ------------- " + array[1].toString());</p> <p> // 以下部分代码采用ArrayListHandler存储方式查询<br /> System.out.println("***Using ArrayListHandler***");<br /> List lArray = (List) qRunner.query(conn, "select * from mc_user_field", new ArrayListHandler());<br /> System.out.println("id ------------- name ");<br /> for (int i = 0; i < lArray.size(); i++)<br /> {<br /> Object[] var = (Object[]) lArray.get(i);<br /> System.out.println(var[0].toString() + " ------------- " + var[1].toString());<br /> }</p> <p> // 以下部分代码采用ColumnListHandler存储方式查询指定列<br /> System.out.println("***Using ColumnListHandler***");<br /> List lName = (List) qRunner.query(conn, "select * from mc_user_field where id = ?", new ColumnListHandler("name"), new Object[] { "5" });<br /> System.out.println("name ");<br /> for (int i = 0; i < lName.size(); i++)<br /> {<br /> String name = (String) lName.get(i);<br /> System.out.println(name);<br /> }</p> <p> // 以下部分代码采用ScalarHandler存储方式查询<br /> System.out.println("***Using ScalarHandler***");<br /> String name = (String) qRunner.query(conn, "select * from mc_user_field where id = ?", new ScalarHandler("name"), new Object[] { "5" });</p> <p> System.out.println("name ");<br /> System.out.println(name);</p> <p> // 以下部分代码采用KeyedHandler存储方式查询<br /> System.out.println("***Using KeyedHandler***");<br /> Map<String, Map> map2 = (Map<String, Map>) qRunner.query(conn, "select * from mc_user_field", new KeyedHandler("name"));</p> <p> System.out.println("name: field_name2");<br /> Map vals = (Map) map2.get("field_name2");<br /> System.out.println(vals.get("id") + " " + vals.get("name") + " " + vals.get("type"));</p> <p> // 以下部分代码插入一条数据<br /> System.out.println("***Insert begin***");<br /> userField = new UserField();<br /> qRunner.update(conn, "insert into mc_user_field (" + "id,name,type,sort_order,required,visible)" + "values (?,?,?,?,?,?)", new Object[] { userField.getId(), userField.getName(), userField.getType(), userField.getSort_order(), userField.getRequired(), userField.getVisible() });<br /> System.out.println("***update end***");</p> <p> // 以下部分代码更新一条数据<br /> System.out.println("***update begin***");<br /> userField = new UserField();<br /> qRunner.update(conn, "update mc_user_field set " + "name = ?,type = ?,sort_order = ?," + "required = ?,visible = ?" + "where id = ?", new Object[] { userField.getName(), userField.getType(), userField.getSort_order(), userField.getRequired(), userField.getVisible(), userField.getId() });<br /> System.out.println("***update end***");</p> <p> // 以下部分代码删除一条数据<br /> System.out.println("***delete begin***");<br /> userField = new UserField();<br /> qRunner.update(conn, "delete from mc_user_field where id2 = ?", new Object[] { userField.getId() });<br /> System.out.println("***delete end***");</p> <p> }<br /> catch (SQLException ex)<br /> {<br /> ex.printStackTrace();<br /> try<br /> {<br /> System.out.println("***rollback begin***");<br /> DbUtils.rollback(conn);<br /> System.out.println("***rollback end***");<br /> }<br /> catch (SQLException e)<br /> {<br /> e.printStackTrace();<br /> }<br /> }<br /> finally<br /> {<br /> DbUtils.closeQuietly(conn);<br /> }</p> <p> }<br /> }<br />

/*<br /> * ResultSetHandler 类型<br /> * ArrayHandler：把结果集中的第一行数据转成对象数组。<br /> * ArrayListHandler：把结果集中的每一行数据都转成一个对象数组，再存放到List中。<br /> * BeanHandler：将结果集中的第一行数据封装到一个对应的JavaBean实例中。<br /> * BeanListHandler：将结果集中的每一行数据都封装到一个对应的JavaBean实例中，存放到List里。<br /> * ColumnListHandler：将结果集中某一列的数据存放到List中。<br /> * KeyedHandler：将结果集中的每一行数据都封装到一个Map里，然后再根据指定的key把每个Map再存放到一个Map里。<br /> * MapHandler：将结果集中的第一行数据封装到一个Map里，key是列名，value就是对应的值。<br /> * MapListHandler：将结果集中的每一行数据都封装到一个Map里，然后再存放到List。<br /> * ScalarHandler：将结果集中某一条记录的其中某一列的数据存成Object。<br /> */

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本文转载自：http://2008ningli.blog.163.com/blog/static/3699023200983102416916/