DBUtils结果集处理

1、BeanHandler查询

 package jdbc;

 import java.sql.Connection;
 import java.sql.SQLException;

 import org.apache.commons.dbutils.DbUtils;
 import org.apache.commons.dbutils.QueryRunner;
 import org.apache.commons.dbutils.handlers.BeanHandler;

 /**
  * <p>
  * Description:BeanHandler处理结果集演示
  * </p>
  *
  * @author Administrator
  * @date 2018年11月5日下午5:04:55
  */
 public class BeanHandlerDemo {

     public static void main(String[] args) throws SQLException {
         // 创建sql语句执行对象
         QueryRunner qr = new QueryRunner();
         // sql语句
         String sql = "select * from sort";
         Object[] params = {};
         // 获得连接
         Connection conn = JDBCUtils.getConnection();
         // 执行sql语句
         Sort sort = qr.query(conn, sql, new BeanHandler<Sort>(Sort.class), params);
         // 打印结果集
         System.out.println(sort);
         // 关闭资源
         DbUtils.closeQuietly(conn);
     }

 }

2、BeanListHandler查询

 package jdbc;

 import java.sql.Connection;
 import java.sql.SQLException;
 import java.util.List;

 import org.apache.commons.dbutils.QueryRunner;
 import org.apache.commons.dbutils.handlers.BeanListHandler;

 /**
  * <p> Description:BeanListHandler类处理结果集演示</p>
  * @author Administrator
  * @date 2018年11月5日下午5:11:32
  */
 public class BeanListHandlerDemo {

     public static void main(String[] args) throws SQLException {
         // 创建sql语句执行对象
         QueryRunner qr = new QueryRunner();
         // sql语句
         String sql = "select * from sort";
         Object[] params = {};
         // 获得连接
         Connection conn = JDBCUtils.getConnection();
         // 执行sql语句
         List<Sort> list = qr.query(conn, sql, new BeanListHandler<Sort>(Sort.class), params);
         // 结果集处理
         for (Sort s: list) {
             System.out.println(s);
         }
     }

 }

3、ColumeListHandler查询

 package jdbc;

 import java.sql.Connection;
 import java.sql.SQLException;
 import java.util.List;

 import org.apache.commons.dbutils.QueryRunner;
 import org.apache.commons.dbutils.handlers.ColumnListHandler;

 /**
  * <p>Description:ColumeListHandler类查询演示 </p>
  * @author Administrator
  * @date 2018年11月5日下午5:16:17
  */
 public class ColumnListHandlerDemo {

     public static void main(String[] args) throws SQLException {
         // 创建sql语句执行对象
         QueryRunner qr = new QueryRunner();
         // sql语句
         String sql = "select * from sort";
         Object[] params = {};
         // 获得连接
         Connection conn = JDBCUtils.getConnection();
         // 执行sql语句
         List<Object> list = qr.query(conn, sql, new ColumnListHandler<Object>(), params);
         // 处理结果集
         for (Object s: list) {
             System.out.println(s);
         }
     }

 }

4、ScalarHandler查询

 package jdbc;

 import java.sql.Connection;
 import java.sql.SQLException;

 import org.apache.commons.dbutils.QueryRunner;
 import org.apache.commons.dbutils.handlers.ScalarHandler;
 /**
  * <p>Description:ScalarHandler类查询演示 </p>
  * @author Administrator
  * @date 2018年11月5日下午5:23:49
  */
 public class ScalarHandlerDemo {

     public static void main(String[] args) throws SQLException {
         // 创建sql语句执行对象
         QueryRunner qr = new QueryRunner();
         // sql语句
         String sql = "select count(*) from sort";
         Object[] params = {};
         // 获得连接
         Connection conn = JDBCUtils.getConnection();
         // 执行sql语句
         Long l = qr.query(conn, sql, new ScalarHandler<Long>(), params);
         // 处理结果集
         System.out.println(l);
     }

 }

5、MapHandler查询

 package jdbc;

 import java.sql.Connection;
 import java.sql.SQLException;
 import java.util.Map;

 import org.apache.commons.dbutils.QueryRunner;
 import org.apache.commons.dbutils.handlers.MapHandler;
 /**
  * <p>Description:MapHandler处理结果集演示 </p>
  * @author Administrator
  * @date 2018年11月5日下午5:28:31
  */
 public class MapHandlerDemo {

     public static void main(String[] args) throws SQLException {
         // 创建sql语句执行对象
         QueryRunner qr = new QueryRunner();
         // sql语句
         String sql = "select * from sort";
         // 获得连接
         Connection conn = JDBCUtils.getConnection();
         // 执行sql语句
         Map<String, Object> map = qr.query(conn, sql, new MapHandler());
         // 处理结果集
         for (String key: map.keySet()) {
             System.out.println(key + "..." + map.get(key));
         }
     }

 }

6、MapListHandler查询

 package jdbc;

 import java.sql.Connection;
 import java.sql.SQLException;
 import java.util.List;
 import java.util.Map;

 import org.apache.commons.dbutils.QueryRunner;
 import org.apache.commons.dbutils.handlers.MapListHandler;
 /**
  * <p>Description:MapListHandler处理结果集演示 </p>
  * @author Administrator
  * @date 2018年11月5日下午5:35:22
  */
 public class MapListHandlerDemo {

     public static void main(String[] args) throws SQLException {
         // 创建sql语句执行对象
         QueryRunner qr = new QueryRunner();
         // sql语句
         String sql = "select * from sort";
         // 获得连接
         Connection conn = JDBCUtils.getConnection();
         // 执行sql语句
         List<Map<String, Object>> list = qr.query(conn, sql, new MapListHandler());
         // 处理结果集
         for (Map<String, Object> map : list) {
             for (String key : map.keySet()) {
                 // 打印一条记录
                 System.out.print(key + "..." + map.get(key));
             }
             // 换行
             System.out.println();
         }

     }

 }